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| 2.7 V, 800 A, 80 MHz Rail-to-Rail I/O Amplifiers AD8031/AD8032 FEATURES Low power Supply current 800 A/amplifier Fully specified at +2.7 V, +5 V, and 5 V supplies High speed and fast settling on 5 V 80 MHz, -3 dB bandwidth (G = +1) 30 V/s slew rate 125 ns settling time to 0.1% Rail-to-rail input and output No phase reversal with input 0.5 V beyond supplies Input CMVR extends beyond rails by 200 mV Output swing to within 20 mV of either rail Low distortion -62 dB @ 1 MHz, VO = 2 V p-p -86 dB @ 100 kHz, VO = 4.6 V p-p Output current: 15 mA High grade option: VOS (maximum) = 1.5 mV NC 1 -IN 2 +IN 3 -VS 4 - + CONNECTION DIAGRAMS 8 7 6 5 NC +VS OUT 01056-001 OUT1 1 -IN1 2 +IN1 3 -VS 4 AD8032 -+ +- 8 7 6 5 +VS OUT2 +IN2 01056-002 -IN2 AD8031 NC NC = NO CONNECT Figure 1. 8-Lead PDIP (N) and SOIC_N (R) VOUT 1 -VS 2 +IN 3 Figure 2. 8-Lead PDIP (N), SOIC_N (R), and MSOP (RM) +VS AD8031 5 4 -IN Figure 3. 5-Lead SOT-23 (RJ-5) APPLICATIONS High speed, battery-operated systems High component density systems Portable test instruments A/D buffers Active filters High speed, set-and-demand amplifiers Operating on supplies from +2.7 V to +12 V and dual supplies up to 6 V, the AD8031/AD8032 are ideal for a wide range of applications, from battery-operated systems with large bandwidth requirements to high speed systems where component density requires lower power dissipation. The AD8031/AD8032 are available in 8-lead PDIP and 8-lead SOIC_N packages and operate over the industrial temperature range of -40C to +85C. The AD8031A is also available in the space-saving 5-lead SOT-23 package, and the AD8032A is available in an 8-lead MSOP package. VIN = 4.85V p-p VOUT = 4.65V p-p G = +1 GENERAL DESCRIPTION The AD8031 (single) and AD8032 (dual) single-supply, voltage feedback amplifiers feature high speed performance with 80 MHz of small signal bandwidth, 30 V/s slew rate, and 125 ns settling time. This performance is possible while consuming less than 4.0 mW of power from a single 5 V supply. These features increase the operation time of high speed, battery-powered systems without compromising dynamic performance. The products have true single-supply capability with rail-to-rail input and output characteristics and are specified for +2.7 V, +5 V, and 5 V supplies. The input voltage range can extend to 500 mV beyond each rail. The output voltage swings to within 20 mV of each rail providing the maximum output dynamic range. The AD8031/AD8032 also offer excellent signal quality for only 800 A of supply current per amplifier; THD is -62 dBc with a 2 V p-p, 1 MHz output signal, and -86 dBc for a 100 kHz, 4.6 V p-p signal on +5 V supply. The low distortion and fast settling time make them ideal as buffers to single-supply ADCs. Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. 1V/DIV 1V/DIV 01056-003 + - 01056-004 2s/DIV 2s/DIV Figure 4. Input VIN +5V - 1k Figure 5. Output VOUT 1.7pF +2.5V Figure 6. Rail-to-Rail Performance at 100 kHz One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2006 Analog Devices, Inc. All rights reserved. 01056-006 VIN VOUT + 01056-005 AD8031/AD8032 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Connection Diagrams...................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 +2.7 V Supply................................................................................ 3 +5 V Supply ................................................................................... 4 5 V Supply ................................................................................... 5 Absolute Maximum Ratings............................................................ 6 Maximum Power Dissipation ..................................................... 6 ESD Caution.................................................................................. 6 Typical Performance Characteristics ............................................. 7 Theory of Operation ...................................................................... 13 Input Stage Operation................................................................ 13 Overdriving the Input Stage...................................................... 13 Output Stage, Open-Loop Gain and Distortion vs. Clearance from Power Supply..................................................................... 14 Output Overdrive Recovery...................................................... 14 Driving Capacitive Loads.......................................................... 15 Applications..................................................................................... 16 A 2 MHz Single-Supply, Biquad Band-Pass Filter ................. 16 High Performance, Single-Supply Line Driver........................... 16 Outline Dimensions ....................................................................... 18 Ordering Guide .......................................................................... 20 REVISION HISTORY 7/06--Rev. B to Rev. C Updated Format..................................................................Universal Updated Outline Dimensions ....................................................... 18 Change to Ordering Guide............................................................ 20 9/99--Rev. A to Rev. B Rev. C | Page 2 of 20 AD8031/AD8032 SPECIFICATIONS +2.7 V SUPPLY @ TA = 25C, VS = 2.7 V, RL = 1 k to 1.35 V, RF = 2.5 k, unless otherwise noted. Table 1. Parameter DYNAMIC PERFORMANCE -3 dB Small Signal Bandwidth Slew Rate Settling Time to 0.1% DISTORTION/NOISE PERFORMANCE Total Harmonic Distortion Input Voltage Noise Input Current Noise Crosstalk (AD8032 Only) DC PERFORMANCE Input Offset Voltage Offset Drift Input Bias Current Input Offset Current Open-Loop Gain INPUT CHARACTERISTICS Common-Mode Input Resistance Differential Input Resistance Input Capacitance Input Voltage Range Input Common-Mode Voltage Range Common-Mode Rejection Ratio Differential Input Voltage OUTPUT CHARACTERISTICS Output Voltage Swing Low Output Voltage Swing High Output Voltage Swing Low Output Voltage Swing High Output Current Short Circuit Current Capacitive Load Drive POWER SUPPLY Operating Range Quiescent Current per Amplifier Power Supply Rejection Ratio VCM = 0 V to 2.7 V VCM = 0 V to 1.55 V 46 58 Conditions G = +1, VO < 0.4 V p-p G = -1, VO = 2 V step G = -1, VO = 2 V step, CL = 10 pF fC = 1 MHz, VO = 2 V p-p, G = +2 fC = 100 kHz, VO = 2 V p-p, G = +2 f = 1 kHz f = 100 kHz f = 1 kHz f = 5 MHz VCM = VCC/2; VOUT = 135 V TMIN to TMAX VCM = VCC/2; VOUT = 135 V VCM = VCC/2; VOUT = 135 V TMIN to TMAX VCM = VCC/2; VOUT = 0.35 V to 2.35 V TMIN to TMAX 76 74 AD8031A/AD8032A Min Typ Max 54 25 80 30 125 -62 -86 15 2.4 5 -60 1 6 10 0.45 50 80 6 10 2 2.2 500 76 74 AD8031B/AD8032B Min Typ Max 54 25 80 30 125 -62 -86 15 2.4 5 -60 0.5 1.6 10 0.45 50 80 1.5 2.5 2 2.2 500 Unit MHz V/s ns dBc dBc nV/Hz pA/Hz pA/Hz dB mV mV V/C A A nA dB dB M k pF V V dB dB V V V V V mA mA mA pF 12 1250 V A dB 40 280 1.6 -0.5 to +3.2 -0.2 to +2.9 64 74 3.4 46 58 40 280 1.6 -0.5 to +3.2 -0.2 to +2.9 64 74 3.4 RL = 10 k RL = 1 k 0.05 2.6 0.15 2.55 Sourcing Sinking G = +2 (See Figure 46) 2.7 VS- = 0 V to -1 V or VS+ = +2.7 V to +3.7 V 75 0.02 2.68 0.08 2.6 15 21 -34 15 12 1250 0.05 2.6 0.15 2.55 0.02 2.68 0.08 2.6 15 21 -34 15 2.7 75 750 86 750 86 Rev. C | Page 3 of 20 AD8031/AD8032 +5 V SUPPLY @ TA = 25C, VS = 5 V, RL = 1 k to 2.5 V, RF = 2.5 k, unless otherwise noted. Table 2. Parameter DYNAMIC PERFORMANCE -3 dB Small Signal Bandwidth Slew Rate Settling Time to 0.1% DISTORTION/NOISE PERFORMANCE Total Harmonic Distortion Input Voltage Noise Input Current Noise Differential Gain Differential Phase Crosstalk (AD8032 Only) DC PERFORMANCE Input Offset Voltage Offset Drift Input Bias Current Input Offset Current Open-Loop Gain INPUT CHARACTERISTICS Common-Mode Input Resistance Differential Input Resistance Input Capacitance Input Voltage Range Input Common-Mode Voltage Range Common-Mode Rejection Ratio Differential Input Voltage OUTPUT CHARACTERISTICS Output Voltage Swing Low Output Voltage Swing High Output Voltage Swing Low Output Voltage Swing High Output Current Short Circuit Current Capacitive Load Drive POWER SUPPLY Operating Range Quiescent Current per Amplifier Power Supply Rejection Ratio VCM = 0 V to 5 V VCM = 0 V to 3.8 V 56 66 Conditions G = +1, VO < 0.4 V p-p G = -1, VO = 2 V step G = -1, VO = 2 V step, CL = 10 pF fC = 1 MHz, VO = 2 V p-p, G = +2 fC = 100 kHz, VO = 2 V p-p, G = +2 f = 1 kHz f = 100 kHz f = 1 kHz RL = 1 k RL = 1 k f = 5 MHz VCM = VCC/2; VOUT = 2.5 V TMIN to TMAX VCM = VCC/2; VOUT = 2.5 V VCM = VCC/2; VOUT = 2.5 V TMIN to TMAX VCM = VCC/2; VOUT = 1.5 V to 3.5 V TMIN to TMAX 76 74 AD8031A/AD8032A Min Typ Max 54 27 80 32 125 -62 -86 15 2.4 5 0.17 0.11 -60 1 6 5 0.45 50 82 6 10 1.2 2.0 350 76 74 AD8031B/AD8032B Min Typ Max 54 27 80 32 125 -62 -86 15 2.4 5 0.17 0.11 -60 0.5 1.6 5 0.45 50 82 1.5 2.5 1.2 2.0 250 Unit MHz V/s ns dBc dBc nV/Hz pA/Hz pA/Hz % Degrees dB mV mV V/C A A nA dB dB M k pF V V dB dB V V V V V mA mA mA pF 12 1400 V A dB 40 280 1.6 -0.5 to +5.5 -0.2 to +5.2 70 80 3.4 56 66 40 280 1.6 -0.5 to +5.5 -0.2 to +5.2 70 80 3.4 RL = 10 k RL = 1 k 0.05 4.95 0.2 4.8 Sourcing Sinking G = +2 (See Figure 46) 2.7 VS- = 0 V to -1 V or VS+ = +5 V to +6 V 75 0.02 4.98 0.1 4.9 15 28 -46 15 12 1400 0.05 4.95 0.2 4.8 0.02 4.98 0.1 4.9 15 28 -46 15 2.7 75 800 86 800 86 Rev. C | Page 4 of 20 AD8031/AD8032 5 V SUPPLY @ TA = 25C, VS = 5 V, RL = 1 k to 0 V, RF = 2.5 k, unless otherwise noted. Table 3. Parameter DYNAMIC PERFORMANCE -3 dB Small Signal Bandwidth Slew Rate Settling Time to 0.1% DISTORTION/NOISE PERFORMANCE Total Harmonic Distortion Input Voltage Noise Input Current Noise Differential Gain Differential Phase Crosstalk (AD8032 Only) DC PERFORMANCE Input Offset Voltage Offset Drift Input Bias Current Input Offset Current Open-Loop Gain INPUT CHARACTERISTICS Common-Mode Input Resistance Differential Input Resistance Input Capacitance Input Voltage Range Input Common-Mode Voltage Range Common-Mode Rejection Ratio Differential/Input Voltage OUTPUT CHARACTERISTICS Output Voltage Swing Low Output Voltage Swing High Output Voltage Swing Low Output Voltage Swing High Output Current Short Circuit Current Capacitive Load Drive POWER SUPPLY Operating Range Quiescent Current per Amplifier Power Supply Rejection Ratio VCM = -5 V to +5 V VCM = -5 V to +3.5 V 60 66 Conditions G = +1, VO < 0.4 V p-p G = -1, VO = 2 V step G = -1, VO = 2 V step, CL = 10 pF fC = 1 MHz, VO = 2 V p-p, G = +2 fC = 100 kHz, VO = 2 V p-p, G = +2 f = 1 kHz f = 100 kHz f = 1 kHz RL = 1 k RL = 1 k f = 5 MHz VCM = 0 V; VOUT = 0 V TMIN to TMAX VCM = 0 V; VOUT = 0 V VCM = 0 V; VOUT = 0 V TMIN to TMAX VCM = 0 V; VOUT = 2 V TMIN to TMAX 76 74 AD8031A/AD8032A Min Typ Max 54 30 80 35 125 -62 -86 15 2.4 5 0.15 0.15 -60 1 6 5 0.45 50 80 6 10 1.2 2.0 350 76 74 AD8031A/AD8032A Min Typ Max 54 30 80 35 125 -62 -86 15 2.4 5 0.15 0.15 -60 0.5 1.6 5 0.45 50 80 1.5 2.5 1.2 2.0 250 Unit MHz V/s ns dBc dBc nV/Hz pA/Hz pA/Hz % Degrees dB mV mV V/C A A nA dB dB M k pF V V dB dB V V V V V mA mA mA pF 6 1600 V A dB 40 280 1.6 -5.5 to +5.5 -5.2 to +5.2 80 90 3.4 60 66 40 280 1.6 -5.5 to +5.5 -5.2 to +5.2 80 90 3.4 RL = 10 k RL = 1 k -4.94 +4.94 -4.7 +4.7 Sourcing Sinking G = +2 (See Figure 46) 1.35 VS- = -5 V to -6 V or VS+ = +5 V to +6 V 76 -4.98 +4.98 -4.85 +4.75 15 35 -50 15 6 1600 -4.94 +4.94 -4.7 +4.7 -4.98 +4.98 -4.85 +4.75 15 35 -50 15 1.35 76 900 86 900 86 Rev. C | Page 5 of 20 AD8031/AD8032 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter Supply Voltage Internal Power Dissipation 1 8-Lead PDIP (N) 8-Lead SOIC_N (R) 8-Lead MSOP (RM) 5-Lead SOT-23 (RJ) Input Voltage (Common Mode) Differential Input Voltage Output Short-Circuit Duration Storage Temperature Range (N, R, RM, RJ) Lead Temperature (Soldering 10 sec) Rating 12.6 V 1.3 W 0.8 W 0.6 W 0.5 W VS 0.5 V 3.4 V Observe Power Derating Curves -65C to +125C 300C MAXIMUM POWER DISSIPATION The maximum power that can be safely dissipated by the AD8031/AD8032 is limited by the associated rise in junction temperature. The maximum safe junction temperature for plastic encapsulated devices is determined by the glass transition temperature of the plastic, approximately 150C. Exceeding this limit temporarily can cause a shift in parametric performance due to a change in the stresses exerted on the die by the package. Exceeding a junction temperature of 175C for an extended period can result in device failure. While the AD8031/AD8032 are internally short-circuit protected, this may not be sufficient to guarantee that the maximum junction temperature (150C) is not exceeded under all conditions. To ensure proper operation, it is necessary to observe the maximum power derating curves shown in Figure 7. 2.0 8-LEAD PDIP 1.5 TJ = +150C MAXIMUM POWER DISSIPATION (W) Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 1 8-LEAD SOIC Specification is for the device in free air: 8-Lead PDIP: JA = 90C/W. 8-Lead SOIC_N: JA = 155C/W. 8-Lead MSOP: JA = 200C/W. 5-Lead SOT-23: JA = 240C/W. 1.0 8-LEAD MSOP 0.5 5-LEAD SOT-23 70 80 90 Figure 7. Maximum Power Dissipation vs. Temperature ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Rev. C | Page 6 of 20 01056-007 0 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 AMBIENT TEMPERATURE (C) AD8031/AD8032 TYPICAL PERFORMANCE CHARACTERISTICS 90 80 N = 250 NUMBER OF PARTS IN BIN 800 600 INPUT BIAS CURRENT (nA) 70 60 50 40 30 20 10 01056-008 400 200 0 -200 -400 -600 01056-011 01056-013 VS = 2.7V VS = 5V VS = 10V 0 -5 -4 -3 -2 -1 0 1 VOS (mV) 2 3 4 5 -800 0 1 2 3 4 5 6 7 8 COMMON-MODE VOLTAGE (V) 9 10 Figure 8. Typical VOS Distribution @ VS = 5 V 2.5 Figure 11. Input Bias Current vs. Common-Mode Voltage 0 VS = 5V 2.3 -0.1 OFFSET VOLTAGE (mV) OFFSET VOLTAGE (mV) 01056-009 -0.2 2.1 VS = +5V -0.3 1.9 VS = 5V 1.7 -0.4 -0.5 0 10 20 30 40 50 TEMPERATURE (C) 60 70 80 90 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 COMMON-MODE VOLTAGE (V) 4.5 5.0 Figure 9. Input Offset Voltage vs. Temperature 1.00 0.95 0.90 VS = 5V 1000 Figure 12. VOS vs. Common-Mode Voltage SUPPLY CURRENT/AMPLIFIER (A) 950 900 850 800 750 700 650 600 -40 -30 -20 -10 IS, VS = 5V INPUT BIAS (A) 0.85 0.80 0.75 0.70 0.65 0.60 0.55 0 10 20 30 40 50 TEMPERATURE (C) 60 70 80 90 01056-010 +IS, VS = +5V +IS, VS = +2.7V 0.50 -40 -30 -20 -10 0 10 20 30 40 50 TEMPERATURE (C) 60 70 80 90 Figure 10. Input Bias Current vs. Temperature Figure 13. Supply Current vs. Temperature Rev. C | Page 7 of 20 01056-012 1.5 -40 -30 -20 -10 -0.6 AD8031/AD8032 0 VCC = 2.7V 1.2 VCC 1.0 DIFFERENCE FROM VCC (V) DIFFERENCE FROM VEE (V) -0.5 VCC = 10V 0.8 VIN VEE VOUT RLOAD VCC 2 -1.0 VCC = 5V 0.6 VCC = 5V 0.4 -1.5 VCC = 10V -2.0 VIN VCC VOUT RLOAD VEE VCC 2 1k RLOAD () 10k 01056-014 0.2 VCC = 2.7V 0 100 1k RLOAD () 10k Figure 14. +Output Saturation Voltage vs. RLOAD @ +85C 0 Figure 17. -Output Saturation Voltage vs. RLOAD @ +85C 1.2 VCC 1.0 VCC = 2.7V DIFFERENCE FROM VCC (V) DIFFERENCE FROM VEE (V) -0.5 VCC = 10V 0.8 VIN VEE VOUT RLOAD VCC 2 -1.0 VCC = 5V -1.5 VCC = 10V -2.0 VIN VCC VOUT RLOAD VEE VCC 2 1k RLOAD () 10k 01056-015 0.6 VCC = 5V 0.4 0.2 VCC = 2.7V 0 100 1k RLOAD () 10k Figure 15. +Output Saturation Voltage vs. RLOAD @ +25C 0 Figure 18. -Output Saturation Voltage vs. RLOAD @ +25C 1.2 VCC 1.0 VCC = 2.7V DIFFERENCE FROM VCC (V) DIFFERENCE FROM VEE (V) -0.5 VCC = 10V 0.8 VIN VEE VOUT RLOAD VCC 2 -1.0 VCC = 5V VCC VCC = 10V VOUT RLOAD VEE VCC 2 01056-016 0.6 VCC = 5V 0.4 -1.5 VIN -2.0 0.2 VCC = 2.7V 1k RLOAD () 10k 01056-019 -2.5 100 1k RLOAD () 10k 0 100 Figure 16. +Output Saturation Voltage vs. RLOAD @ -40C Figure 19. -Output Saturation Voltage vs. RLOAD @ -40C Rev. C | Page 8 of 20 01056-018 -2.5 100 01056-017 -2.5 100 AD8031/AD8032 110 105 100 95 -AOL VS = 5V 100 90 500mV 1V INPUT BIAS CURRENT (mA) 10 GAIN (dB) 90 85 80 75 70 65 0 2k 4k +AOL 0 -10 VS = 5V 10 0% 500mV -1.5 0.5 2.5 4.5 6.5 01056-023 6k RLOAD () 8k 10k 01056-020 60 INPUT VOLTAGE (V) Figure 20. Open-Loop Gain (AOL) vs. RLOAD 86 VS = 5V RL = 1k 84 -AOL Figure 23. Differential Input Overvoltage I-V Characteristics 0.05 DIFF GAIN (%) 0 -0.05 -0.10 -0.15 1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH GAIN (dB) 82 +AOL DIFF PHASE (Degrees) 80 0.10 0.05 0 -0.05 -0.10 1ST 2ND 3RD 4TH 5TH 6TH 7TH 8TH 9TH 10TH 11TH 01056-024 78 0 10 20 30 40 50 TEMPERATURE (C) 60 70 80 90 Figure 21. Open Loop Gain vs. (AOL) Temperature Figure 24. Differential Gain and Phase @ VS = 5 V; RL = 1 k 110 RLOAD = 10k VS = 5V INPUT VOLTAGE NOISE (nV/ Hz) 01056-021 76 -40 -30 -20 -10 100 VS = 5V 30 VOLTAGE NOISE 10 10 100 INPUT CURRENT NOISE (pA/ Hz) 01056-025 100 90 AOL (dB) 80 RLOAD = 1k 70 3 CURRENT NOISE 1 1 60 0.1 01056-022 50 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VOUT (V) 0.3 10 100 1k 10k 100k 1M 10M Figure 22. Open-Loop Gain (AOL) vs. VOUT FREQUENCY (Hz) Figure 25. Input Voltage Noise vs. Frequency Rev. C | Page 9 of 20 AD8031/AD8032 5 4 3 VS = 5V G = +1 RL = 1k 40 GAIN 30 20 10 0 NORMALIZED GAIN (dB) 2 1 0 -1 -2 -3 -4 0.1 1 10 100 01056-026 PHASE (Degrees) -90 -135 -180 -225 0.3 1 -10 PHASE -20 OPEN-LOOP GAIN (dB) 01056-031 01056-030 -5 FREQUENCY (MHz) 10 FREQUENCY (MHz) 100 Figure 26. Unity Gain, -3 dB Bandwidth 3 2 NORMALIZED GAIN (dB) TOTAL HARMONIC DISTORTION (dBc) -20 Figure 29. Open-Loop Frequency Response VS = 5V VIN = -16dBm 1 0 -1 -2 -3 VIN -4 -5 VS 2k VOUT 50 +85C -30 G = +1, RL = 2k TO -40 VCC 2 -40C +25C -50 2.5V p-p VS = 2.7V -60 1.3V p-p VS = 2.7V 2V p-p VS = 2.7V 4.8V p-p VS = 5V -70 01056-027 0.1 1 10 100 -80 1k 10k 100k 1M 10M FREQUENCY (MHz) FUNDAMENTAL FREQUENCY (Hz) Figure 27. Closed-Loop Gain vs. Temperature 2 Figure 30. Total Harmonic Distortion vs. Frequency; G = +1 -20 TOTAL HARMONIC DISTORTION (dBc) 1 0 VS = +2.7V RL + CL TO 1.35V VS = +5V RL + CL TO 2.5V VS = 5V -30 -40 -50 -60 -70 CLOSED-LOOP GAIN (dB) -1 -2 -3 -4 -5 -6 -7 G = +1 CL = 5pF RL = 1k G = +2 VS = 5V VCC RL = 1k TO 2 4.8V p-p 1V p-p 4.6V p-p -80 -90 -100 1k 4V p-p 01056-028 -8 100k 1M 10M FREQUENCY (Hz) 100M 10k 100k 1M 10M FUNDAMENTAL FREQUENCY (Hz) Figure 28. Closed-Loop Gain vs. Supply Voltage Figure 31. Total Harmonic Distortion vs. Frequency; G +2 Rev. C | Page 10 of 20 01056-029 AD8031/AD8032 10 0 POWER SUPPLY REJECTION RATIO (dB) VS = 5V 8 -20 -40 -60 -80 -100 -120 100 1k VS = 5V OUTPUT (V p-p) 6 VS = +5V 4 VS = +2.7V 2 01056-032 10k 100k FREQUENCY (Hz) 1M 10M 10k 100k 1M 10M 100M FREQUENCY (Hz) Figure 32. Large Signal Response Figure 35. PSRR vs. Frequency 100 50 10 RBT = 50 5.5 4.5 VS = 5V RL = 10k TO 2.5V VIN = 6V p-p G = +1 ROUT () 3.5 1V/DIV 2.5 1.5 1 0.1 RBT RBT = 0 0.5 VOUT -0.5 0.1 1 10 100 200 FREQUENCY (MHz) 10s/DIV Figure 33. ROUT vs. Frequency 0 Figure 36. Output Voltage COMMON-MODE REJECTION RATIO (dB) VS = 5V -20 5.5 4.5 INPUT VS = 5V G = +1 INPUT = 650mV BEYOND RAILS -40 1V/DIV 3.5 2.5 1.5 0.5 -60 -80 -0.5 1k 10k 100k 1M 10M 01056-034 -100 100 FREQUENCY (Hz) 10s/DIV Figure 34. CMRR vs. Frequency Figure 37. Output Voltage Phase Reversal Behavior Rev. C | Page 11 of 20 01056-037 01056-036 01056-033 01056-035 0 1k AD8031/AD8032 RL TO +2.5V 2.56 2.54 G = +1 RF = 0 RL = 2k TO 2.5V CL = 5pF TO 2.5V VS = 5V 500mV/DIV 20mV/DIV 2.52 2.50 2.48 2.46 RL TO GND 0 10s/DIV VS = +5V RL = 1k G = -1 01056-038 2.44 50ns/DIV Figure 38. Output Swing Figure 41. 100 mV Step Response 3.1 2.9 CROSSTALK(dB) G = +2 RF = RG = 2.5k RL = 2k CL = 5pF VS = 5V -50 -60 -70 -80 -90 -100 2.5k 2.5k 2.5k VIN 50 01056-039 200mV/DIV 2.7 2.5 2.3 2.1 1.9 VS = 2.5V VIN = +10dBm 2.5k VOUT 50 RECEIVER 01056-042 1k TRANSMITTER 0.1 0.1 1 10 10 50ns/DIV 100 200 100 FREQUENCY (MHz) Figure 39. 1 V Step Response Figure 42. Crosstalk vs. Frequency 2.85 2.35 500mV/DIV VS = 2.7V RL = 1k G = -1 1.85 1.35 0.85 0.35 RL TO 1.35V RL TO GND 01056-040 10s/DIV Figure 40. Output Swing Rev. C | Page 12 of 20 01056-041 AD8031/AD8032 THEORY OF OPERATION The AD8031/AD8032 are single and dual versions of high speed, low power, voltage feedback amplifiers featuring an innovative architecture that maximizes the dynamic range capability on the inputs and outputs. The linear input commonmode range exceeds either supply voltage by 200 mV, and the amplifiers show no phase reversal up to 500 mV beyond supply. The output swings to within 20 mV of either supply when driving a light load; 300 mV when driving up to 5 mA. Fabricated on Analog Devices, Inc. eXtra Fast Complementary Bipolar (XFCB) process, the amplifier provides an impressive 80 Hz bandwidth when used as a follower and a 30 V/s slew rate at only 800 A supply current. Careful design allows the amplifier to operate with a supply voltage as low as 2.7 V. Switching to the NPN pair as the common-mode voltage is driven beyond 1 V within the positive supply allows the amplifier to provide useful operation for signals at either end of the supply voltage range and eliminates the possibility of phase reversal for input signals up to 500 mV beyond either power supply. Offset voltage also changes to reflect the offset of the input pair in control. The transition region is small, approximately 180 mV. These sudden changes in the dc parameters of the input stage can produce glitches that adversely affect distortion. OVERDRIVING THE INPUT STAGE Sustained input differential voltages greater than 3.4 V should be avoided as the input transistors can be damaged. Input clamp diodes are recommended if the possibility of this condition exists. The voltages at the collectors of the input pairs are set to 200 mV from the power supply rails. This allows the amplifier to remain in linear operation for input voltages up to 500 mV beyond the supply voltages. Driving the input common-mode voltage beyond that point will forward bias the collector junction of the input transistor, resulting in phase reversal. Sustaining this condition for any length of time should be avoided because it is easy to exceed the maximum allowed input differential voltage when the amplifier is in phase reversal. INPUT STAGE OPERATION A simplified schematic of the input stage appears in Figure 43. For common-mode voltages up to 1.1 V within the positive supply (0 V to 3.9 V on a single 5 V supply), tail current I2 flows through the PNP differential pair, Q13 and Q17. Q5 is cut off; no bias current is routed to the parallel NPN differential pair, Q2 and Q3. As the common-mode voltage is driven within 1.1 V of the positive supply, Q5 turns on and routes the tail current away from the PNP pair and to the NPN pair. During this transition region, the input current of the amplifier changes magnitude and direction. Reusing the same tail current ensures that the input stage has the same transconductance, which determines the gain and bandwidth of the amplifier, in both regions of operation. VCC I2 90A Q9 1.1V R5 50k Q5 VIP VIN R1 2k I3 25A R2 2k R6 850 Q13 R7 850 Q17 Q3 R8 850 Q2 R9 850 4 Q8 1 Q6 Q10 1 Q7 4 OUTPUT STAGE, COMMON-MODE FEEDBACK Q11 4 I4 25A Q14 1 1 4 Q15 Q16 VEE Figure 43. Simplified Schematic of AD8031 Input Stage Rev. C | Page 13 of 20 01056-043 I1 5A Q18 Q4 R3 2k R4 2k AD8031/AD8032 OUTPUT STAGE, OPEN-LOOP GAIN AND DISTORTION vs. CLEARANCE FROM POWER SUPPLY The AD8031 features a rail-to-rail output stage. The output transistors operate as common-emitter amplifiers, providing the output drive current as well as a large portion of the amplifier's open-loop gain. I1 25A Q42 Q51 I2 25A Q47 DIFFERENTIAL DRIVE FROM INPUT STAGE Q20 Q21 Q43 Q48 Q37 Q38 Q68 R29 300 Q27 C5 1.5pF The open-loop gain of the AD8031 decreases approximately linearly with load resistance and depends on the output voltage. Open-loop gain stays constant to within 250 mV of the positive power supply, 150 mV of the negative power supply, and then decreases as the output transistors are driven further into saturation. The distortion performance of the AD8031/AD8032 amplifiers differs from conventional amplifiers. Typically, the distortion performance of the amplifier degrades as the output voltage amplitude increases. Used as a unity gain follower, the output of the AD8031/ AD8032 exhibits more distortion in the peak output voltage region around VCC - 0.7 V. This unusual distortion characteristic is caused by the input stage architecture and is discussed in detail in the Input Stage Operation section, C9 5pF + VOUT + I4 25A Q50 Q49 I5 25A Q44 01056-044 OUTPUT OVERDRIVE RECOVERY Output overdrive of an amplifier occurs when the amplifier attempts to drive the output voltage to a level outside its normal range. After the overdrive condition is removed, the amplifier must recover to normal operation in a reasonable amount of time. As shown in Figure 45, the AD8031/AD8032 recover within 100 ns from negative overdrive and within 80 ns from positive overdrive. RF = RG = 2k RG RF VOUT 50 RL Figure 44. Output Stage Simplified Schematic The output voltage limit depends on how much current the output transistors are required to source or sink. For applications with low drive requirements (for instance, a unity gain follower driving another amplifier input), the AD8031 typically swings within 20 mV of either voltage supply. As the required current load increases, the saturation output voltage increases linearly as ILOAD x RC where: ILOAD is the required load current. RC is the output transistor collector resistance. For the AD8031, the collector resistances for both output transistors are typically 25 . As the current load exceeds the rated output current of 15 mA, the amount of base drive current required to drive the output transistor into saturation reaches its limit, and the amplifier's output swing rapidly decreases. VIN 1V 100ns Figure 45. Overdrive Recovery Rev. C | Page 14 of 20 01056-045 VS = 2.5V VIN = 2.5V RL = 1k TO GND AD8031/AD8032 DRIVING CAPACITIVE LOADS CAPACITIVE LOAD (pF) 1000 VS = 5V 200mV STEP WITH 30% OVERSHOOT RS = 5 Capacitive loads interact with an op amp's output impedance to create an extra delay in the feedback path. This reduces circuit stability and can cause unwanted ringing and oscillation. A given value of capacitance causes much less ringing when the amplifier is used with a higher noise gain. The capacitive load drive of the AD8031/AD8032 can be increased by adding a low valued resistor in series with the capacitive load. Introducing a series resistor tends to isolate the capacitive load from the feedback loop, thereby diminishing its influence. Figure 46 shows the effects of a series resistor on the capacitive drive for varying voltage gains. As the closed-loop gain is increased, the larger phase margin allows for larger capacitive loads with less overshoot. Adding a series resistor at lower closed-loop gains accomplishes the same effect. For large capacitive loads, the frequency response of the amplifier is dominated by the roll-off of the series resistor and capacitive load. RS = 0 100 RS = 20 RS = 20 RG RS = 0, 5 RF RS VOUT CL 2 3 4 5 01056-046 10 1 0 1 CLOSED-LOOP GAIN (V/V) Figure 46. Capacitive Load Drive vs. Closed-Loop Gain Rev. C | Page 15 of 20 AD8031/AD8032 APPLICATIONS A 2 MHz SINGLE-SUPPLY, BIQUAD BAND-PASS FILTER Figure 47 shows a circuit for a single-supply, biquad band-pass filter with a center frequency of 2 MHz. A 2.5 V bias level is easily created by connecting the noninverting inputs of all three op amps to a resistor divider consisting of two 1 k resistors connected between 5 V and ground. This bias point is also decoupled to ground with a 0.1 F capacitor. The frequency response of the filter is shown in Figure 48. To maintain an accurate center frequency, it is essential that the op amp have sufficient loop gain at 2 MHz. This requires the choice of an op amp with a significantly higher unity gain, crossover frequency. The unity gain, crossover frequency of the AD8031/AD8032 is 40 MHz. Multiplying the open-loop gain by the feedback factors of the individual op amp circuits yields the loop gain for each gain stage. From the feedback networks of the individual op amp circuits, it can be seen that each op amp has a loop gain of at least 21 dB. This level is high enough to ensure that the center frequency of the filter is not affected by the op amp's bandwidth. If, for example, an op amp with a gain bandwidth product of 10 MHz was chosen in this application, the resulting center frequency would shift by 20% to 1.6 MHz. R6 1k C1 50pF R2 2k 5V R1 3k 1k 0.1F R3 2k 5V 0.1F R5 2k C2 50pF VIN 49.9 3 2 4 0 -10 GAIN (dB) -20 -30 -40 100k 1M FREQUENCY (Hz) 10M 100M Figure 48. Frequency Response of 2 MHz Band-Pass Filter HIGH PERFORMANCE, SINGLE-SUPPLY LINE DRIVER Even though the AD8031/AD8032 swing close to both rails, the AD8031 has optimum distortion performance when the signal has a common-mode level half way between the supplies and when there is about 500 mV of headroom to each rail. If low distortion is required in single-supply applications for signals that swing close to ground, an emitter-follower circuit can be used at the op amp output. 5V 10F 0.1F 7 6 R4 2k VIN 2N3904 AD8031 AD8031 2.49k 49.9 200 49.9 VOUT 01056-049 1/2 AD8032 1/2 AD8032 01056-047 2.49k 0.1F 1k VOUT Figure 47. A 2 MHz, Biquad Band-Pass Filter Using AD8031/AD8032 Figure 49. Low Distortion Line Driver for Single-Supply, Ground Referenced Signals Figure 49 shows the AD8031 configured as a single-supply, gainof-2 line driver. With the output driving a back-terminated 50 line, the overall gain from VIN to VOUT is unity. In addition to minimizing reflections, the 50 back termination resistor protects the transistor from damage if the cable is short circuited. The emitter follower, which is inside the feedback loop, ensures that the output voltage from the AD8031 stays about 700 mV above ground. Using this circuit, low distortion is attainable even when the output signal swings to within 50 mV of ground. The circuit was tested at 500 kHz and 2 MHz. Rev. C | Page 16 of 20 01056-048 -50 10k AD8031/AD8032 Figure 50 and Figure 51 show the output signal swing and frequency spectrum at 500 kHz. At this frequency, the output signal (at VOUT), which has a peak-to-peak swing of 1.95 V (50 mV to 2 V), has a THD of -68 dB (SFDR = -77 dB). This circuit could also be used to drive the analog input of a single-supply, high speed ADC whose input voltage range is referenced to ground (for example, 0 V to 2 V or 0 V to 4 V). In this case, a back termination resistor is not necessary (assuming a short physical distance from transistor to ADC); therefore, the emitter of the external transistor would be connected directly to the ADC input. The available output voltage swing of the circuit would therefore be doubled. 1.5V 100 90 10 0% 100 90 2V 0.5V 1s Figure 50. Output Signal Swing of Low Distortion Line Driver at 500 kHz +9dBm 01056-050 50mV 10 0% 01056-052 01056-053 0.2V 50mV VERTICAL SCALE (10dB/DIV) 200ns Figure 52. Output Signal Swing of Low Distortion Line Driver at 2 MHz +7dBm START 0Hz STOP 5MHz Figure 51. THD of Low Distortion Line Driver at 500 kHz Figure 52 and Figure 53 show the output signal swing and frequency spectrum at 2 MHz. As expected, there is some degradation in signal quality at the higher frequency. When the output signal has a peak-to-peak swing of 1.45 V (swinging from 50 mV to 1.5 V), the THD is -55 dB (SFDR = -60 dB). VERTICAL SCALE (10dB/DIV) START 0Hz 01056-051 STOP 20MHz Figure 53. THD of Low Distortion Line Driver at 2 MHz Rev. C | Page 17 of 20 AD8031/AD8032 OUTLINE DIMENSIONS 0.400 (10.16) 0.365 (9.27) 0.355 (9.02) 8 1 5 4 0.280 (7.11) 0.250 (6.35) 0.240 (6.10) PIN 1 0.100 (2.54) BSC 0.210 (5.33) MAX 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 0.070 (1.78) 0.060 (1.52) 0.045 (1.14) 0.060 (1.52) MAX 0.015 (0.38) MIN 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) 0.015 (0.38) GAUGE PLANE SEATING PLANE 0.430 (10.92) MAX 0.014 (0.36) 0.010 (0.25) 0.008 (0.20) 0.005 (0.13) MIN COMPLIANT TO JEDEC STANDARDS MS-001-BA CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. CORNER LEADS MAY BE CONFIGURED AS WHOLE OR HALF LEADS. Figure 54. 8-Lead Plastic Dual In-Line Package [PDIP] Narrow Body (N-8) Dimensions shown in inches and (millimeters) 5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497) 8 1 5 4 6.20 (0.2440) 5.80 (0.2284) 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE 1.75 (0.0688) 1.35 (0.0532) 0.50 (0.0196) 0.25 (0.0099) 8 0 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 45 0.51 (0.0201) 0.31 (0.0122) COMPLIANT TO JEDEC STANDARDS MS-012-A A CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 55. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) Rev. C | Page 18 of 20 060506-A AD8031/AD8032 2.90 BSC 5 4 1.60 BSC 1 2 3 2.80 BSC PIN 1 0.95 BSC 1.30 1.15 0.90 1.90 BSC 1.45 MAX 0.22 0.08 10 5 0 0.60 0.45 0.30 0.15 MAX 0.50 0.30 SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-178-AA Figure 56. 5-Lead Small Outline Transistor Package [SOT-23] (RJ-5) Dimensions shown in millimeters 3.20 3.00 2.80 3.20 3.00 2.80 PIN 1 8 5 1 5.15 4.90 4.65 4 0.65 BSC 0.95 0.85 0.75 0.15 0.00 0.38 0.22 SEATING PLANE 1.10 MAX 8 0 0.80 0.60 0.40 0.23 0.08 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 57. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters Rev. C | Page 19 of 20 AD8031/AD8032 ORDERING GUIDE Model AD8031AN AD8031ANZ 1 AD8031AR AD8031AR-REEL AD8031AR-REEL7 AD8031ARZ1 AD8031ARZ-REEL1 AD8031ARZ-REEL71 AD8031ART-R2 AD8031ART-REEL AD8031ART-REEL7 AD8031ARTZ-R21 AD8031ARTZ-REEL1 AD8031ARTZ-REEL71 AD8031BN AD8031BNZ1 AD8031BR AD8031BR-REEL AD8031BR-REEL7 AD8031BRZ1 AD8031BRZ-REEL1 AD8031BRZ-REEL71 AD8032AN AD8032ANZ1 AD8032AR AD8032AR-REEL AD8032AR-REEL7 AD8032ARZ1 AD8032ARZ-REEL1 AD8032ARZ-REEL71 AD8032ARM AD8032ARM-REEL AD8032ARM-REEL7 AD8032ARMZ1 AD8032ARMZ-REEL1 AD8032ARMZ-REEL71 AD8032BN AD8032BNZ1 AD8032BR AD8032BR-REEL AD8032BR-REEL7 AD8032BRZ1 AD8032BRZ-REEL1 AD8032BRZ-REEL71 1 Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package Description 8-Lead PDIP 8-Lead PDIP 8-Lead SOIC_N 8-Lead SOIC_N, 13" Tape and Reel 8-Lead SOIC_N, 7" Tape and Reel 8-Lead SOIC_N 8-Lead SOIC_N, 13" Tape and Reel 8-Lead SOIC_N, 7" Tape and Reel 5-Lead SOT-23 5-Lead SOT-23, 13" Tape and Reel 5-Lead SOT-23, 7" Tape and Reel 5-Lead SOT-23 5-Lead SOT-23, 13" Tape and Reel 5-Lead SOT-23, 7" Tape and Reel 8-Lead PDIP 8-Lead PDIP 8-Lead SOIC_N 8-Lead SOIC_N, 13" Tape and Reel 8-Lead SOIC_N, 7" Tape and Reel 8-Lead SOIC_N 8-Lead SOIC_N, 13" Tape and Reel 8-Lead SOIC_N, 7" Tape and Reel 8-Lead PDIP 8-Lead PDIP 8-Lead SOIC_N 8-Lead SOIC_N, 13" Tape and Reel 8-Lead SOIC_N, 7" Tape and Reel 8-Lead SOIC_N 8-Lead SOIC_N, 13" Tape and Reel 8-Lead SOIC_N, 7" Tape and Reel 8-Lead MSOP 8-Lead MSOP, 13" Tape and Reel 8-Lead MSOP, 7" Tape and Reel 8-Lead MSOP 8-Lead MSOP, 13" Tape and Reel 8-Lead MSOP, 7" Tape and Reel 8-Lead PDIP 8-Lead PDIP 8-Lead SOIC_N 8-Lead SOIC_N, 13" Tape and Reel 8-Lead SOIC_N, 7" Tape and Reel 8-Lead SOIC_N 8-Lead SOIC_N, 13" Tape and Reel 8-Lead SOIC_N, 7" Tape and Reel Package Option N-8 N-8 R-8 R-8 R-8 R-8 R-8 R-8 RJ-5 RJ-5 RJ-5 RJ-5 RJ-5 RJ-5 N-8 N-8 R-8 R-8 R-8 R-8 R-8 R-8 N-8 N-8 R-8 R-8 R-8 R-8 R-8 R-8 RM-8 RM-8 RM-8 RM-8 RM-8 RM-8 N-8 N-8 R-8 R-8 R-8 R-8 R-8 R-8 Branding H0A H0A H0A H04 H04 H04 H9A H9A H9A H9A# H9A# H9A# Z = Pb-free part, # denotes lead-free product may be top or bottom marked. (c)2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C01056-0-7/06(C) Rev. C | Page 20 of 20 |
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