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| www.fairchildsemi.com KM4112 70A, Low Cost, +2.7V & +5V, 7.3MHz Rail-to-Rail Amplifier Features I I I I I I I I I I I General Description The KM4112 is an ultra-low power, low cost, voltage feedback amplifier. The KM4112 uses only 70A of supply current and is designed to operate on +2.7V, +5V, or 2.5V supplies. The input voltage range extends 300mV below the negative rail and 1.2V below the positive rail. The KM4112 offers high bipolar performance at a low CMOS price. The KM4112 offers superior dynamic performance with a 7.3MHz small signal bandwidth and 9V/s slew rate. The combination of low power, high bandwidth, and rail-to-rail performance make the KM4112 well suited for battery-powered communication/computing systems. 70A supply current 7.3MHz bandwidth Fully specified at +2.7V and +5V supplies Output voltage range: 0.04V to 4.96V; Vs = +5 Input voltage range: -0.3V to +3.8V; Vs = +5 9V/s slew rate 4mA linear output current 9mA short circuit output current 29nV/Hz input voltage noise Competes with low power CMOS amps Small package option (SOT23-5) Applications I I I I I Normalized Magnitude (2dB/div) Portable/battery-powered applications A/D buffer Active filters Signal conditioning Portable test instruments Non-Inverting Freq. Response Vs = +5V G=2 Rf = 10k KM4112 Package SOT23-5 Out -Vs +In 1 2 + 5 +Vs - 0.01 0.1 1 10 3 4 -In Frequency (MHz) REV. 2 July 2001 DATA SHEET KM4112 KM4112 Electrical Characteristics PARAMETERS Case Temperature Frequency Domain Response -3dB bandwidth full power bandwidth gain bandwidth product Time Domain Response rise and fall time settling time to 0.1% overshoot slew rate Distortion and Noise Response 2nd harmonic distortion 3rd harmonic distortion THD input voltage noise DC Performance input offset voltage average drift input bias current average drift input offset current power supply rejection ratio open loop gain quiescent current Input Characteristics input resistance input capacitance input common mode voltage range common mode rejection ratio Output Characteristics output voltage swing linear output current short circuit output current power supply operating range (Vs = +2.7V, G = 2, RL = 10k to Vs/2, Rf = 10k; unless noted) TYP +25C MIN & MAX +25C MHz MHz MHz MHz ns ns % V/s dBc dBc dB nV/Hz 5 250 100 58 65 95 mV V/C nA pA/C nA dB dB A M pF V dB V V mA mA V 2 2 2 2 2 2 1 UNITS NOTES CONDITIONS G = +1, Vo = 0.05Vpp G = +2, Vo < 0.2Vpp G = -1, Vo = 2Vpp 0.2V step 1V step 1V step, 2V step, G = -1 1Vpp, 100kHz 1Vpp, 100kHz 1Vpp, 100kHz >10kHz 6.5 3 2 3.5 55 700 7 7 68 65 63 30 1 3 90 100 2.1 63 82 62 >10 1.6 -0.3 to 1.5 95 DC DC, Vcm = 0V to Vs - 1.5 RL = 10k to Vs/2 RL = 2k to Vs/2 68 2 2 0.035 to 2.665 0.15 to 2.55 0.07 to 2.6 4 9 2.7 2.5 to 5.5 Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels are determined from tested parameters. NOTES: 1) For G = +1, Rf = 0. 2) 100% tested at +25C. Absolute Maximum Ratings supply voltage 0 to +6V maximum junction temperature +175C storage temperature range -65C to +150C lead temperature (10 sec) +260C operating temperature range (recommended) -40C to +85C input voltage range +Vs +0.5V; -Vs -0.5V internal power dissipation see power derating curves Package Thermal Resistance Package 5 lead SOT23 JA 256C/W 2 REV. 2 July 2001 KM4112 DATA SHEET KM4112 Electrical Characteristics PARAMETERS Case Temperature Frequency Domain Response -3dB bandwidth full power bandwidth gain bandwidth product Time Domain Response rise and fall time settling time to 0.1% overshoot slew rate Distortion and Noise Response 2nd harmonic distortion 3rd harmonic distortion THD input voltage noise DC Performance input offset voltage average drift input bias current average drift input offset current power supply rejection ratio open loop gain quiescent current Input Characteristics input resistance input capacitance input common mode voltage range common mode rejection ratio Output Characteristics output voltage swing linear output current short circuit output current power supply operating range (Vs = +5V, G = 2, RL = 10k to Vs/2, Rf = 10k; unless noted) TYP +25C MIN & MAX +25C MHz MHz MHz MHz ns ns % V/s dBc dBc dB nV/Hz 5 250 100 58 65 100 mV V/C nA pA/C nA dB dB A M pF V dB V V mA mA V 2 2 2 2 2 2 1 UNITS NOTES CONDITIONS G = +1, Vo = 0.05Vpp G = +2, Vo < 0.2Vpp G = -1, Vo = 2Vpp 0.2V step 2V step 2V step, 2V step, G = -1 2Vpp, 100kHz 2Vpp, 100kHz 2Vpp, 100kHz >10kHz 7.3 3.4 2.5 4 50 600 4 9 67 56 55 29 1 8 90 100 1.3 63 76 70 >10 1.6 -0.3 to 3.8 97 0.04 to 4.96 0.09 to 4.9 4 9 5 DC DC, Vcm = 0V to Vs - 1.5 RL = 10k to Vs/2 RL = 2k to Vs/2 68 0.15 to 4.85 2 2 2.5 to 5.5 Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels are determined from tested parameters. NOTES: 1) For G = +1, Rf = 0. 2) 100% tested at +25C. REV. 2 July 2001 3 DATA SHEET KM4112 KM4112 Performance Characteristics Non-Inverting Frequency Response Vs = +5V Normalized Magnitude (2dB/div) G=1 G=2 (Vs = +5V, G = 2, RL = 10k to Vs/2, Rf = 10k; unless noted) Inverting Frequency Response Vs = +5V Normalized Magnitude (1dB/div) G = -2 G = -10 G = 10 G = -5 G = -1 G=5 0.01 0.1 1 10 0.01 0.1 1 10 Frequency (MHz) Non-Inverting Freq. Response Vs = +2.7V Normalized Magnitude (2dB/div) G=1 G=2 Frequency (MHz) Inverting Frequency Response Vs = +2.7V Normalized Magnitude (1dB/div) G = -1 G = -2 G = 10 G = -10 G=5 G = -5 0.01 0.1 1 10 0.01 0.1 1 10 Frequency (MHz) Large Signal Frequency Response 80 Vo = 1Vpp Frequency (MHz) Open Loop Gain & Phase vs. Frequency 0 |Gain| 70 -20 -40 -60 -80 -100 -120 -140 -160 Open Loop Phase (deg) Open Loop Gain (dB) Magnitude (1dB/div) 60 50 40 30 20 10 0 Phase Vo = 2Vpp -10 0.01 0.1 1 10 1 10 100 1k 10k 100k 1M -180 Frequency (MHz) Input Voltage Noise 140 -20 Vo = 2Vpp Frequency (Hz) 2nd & 3rd Harmonic Distortion; Vs = +5V -30 Voltage Noise (nV/Hz) 120 80 60 40 20 0 0.0001 Distortion (dBc) 100 -40 -50 -60 -70 -80 -90 3rd 2nd 0.001 0.01 0.1 1.0 10 10 100 1000 Frequency (MHz) Frequency (kHz) 4 REV. 2 July 2001 KM4112 DATA SHEET KM4112 Performance Characteristics 2nd & 3rd Harmonic Distortion; Vs = +2.7V -20 Vo = 1Vpp (Vs = +5V, G = 2, RL = 10k to Vs/2, Rf = 10k; unless noted) PSRR 0 -10 -20 -30 Distortion (dBc) -40 PSRR (dB) 3rd -30 -40 -50 -60 -70 -80 -50 -60 2nd -70 -80 -90 10 100 1000 1 10 100 1k 10k 100k 1M Frequency (kHz) CMRR 0 -10 -30 -40 -50 -60 -70 -80 -90 -100 1 10 100 1k 10k 100k 1M 4.70 1 -20 4.95 4.90 Frequency (Hz) Output Swing vs. RL Output Swing (Vpp) CMRR (dB) 4.85 4.80 4.75 10 100 Frequency (Hz) Large Signal Pulse Response Vs = +5V Output Voltage (0.5V/div) RL (k) Time (1s/div) REV. 2 July 2001 5 DATA SHEET Maximum Power Dissipation (W) KM4112 2.0 General Description The KM4112 is a single supply, general purpose, voltagefeedback amplifier fabricated on a complementary bipolar process. The KM4112 offers 7.3MHz unity gain bandwidth, 9V/s slew rate, and only 70A supply current. It features a rail-to-rail output stage and is unity gain stable. The design utilizes a patent pending topology that provides increased slew rate performance. The common mode input range extends to 300mV below ground and to 1.2V below Vs. Exceeding these values will not cause phase reversal. However, if the input voltage exceeds the rails by more than 0.5V, the input ESD devices will begin to conduct. The output will stay at the rail during this overdrive condition. The design uses a Darlington output stage. The output stage is short circuit protected and offers "soft" saturation protection that improves recovery time. The typical circuit schematic is shown in Figure 1. 1.5 1.0 0.5 SOT23-5 lead 0 -50 -30 -10 10 30 50 70 90 Ambient Temperature ( C) Figure 2: Power Derating Curves Overdrive Recovery For an amplifier, an overdrive condition occurs when the output and/or input ranges are exceeded. The recovery time varies based on whether the input or output is overdriven and by how much the ranges are exceeded. The KM4112 will typically recover in less than 60ns from an overdrive condition. Figure 3 shows the KM4112 in an overdriven condition. G=5 +Vs 6.8F Output Voltage (1V/div) + Input Voltage (0.2V/div) In + Rg 0.01F Out Rf Input Output KM4112 Time (2s/div) Figure 3: Overdrive Recovery Figure 1: Typical Configuration Power Dissipation The maximum internal power dissipation allowed is directly related to the maximum junction temperature. If the maximum junction temperature exceeds 150C, some reliability degradation will occur. If the maximum junction temperature exceeds 175C for an extended time, device failure may occur. The KM4112 is short circuit protected. However, this may not guarantee that the maximum junction temperature (+150C) is not exceeded under all conditions. Follow the maximum power derating curves shown in Figure 2 to ensure proper operation. Driving Capacitive Loads A small series resistance (Rs) at the output of the amplifier, illustrated in Figure 4, will improve stability and settling performance. + Rf Rg Rs CL RL Figure 4: Typical Topology for driving a capacitive load 6 REV. 2 July 2001 KM4112 DATA SHEET Layout Considerations General layout and supply bypassing play major roles in high frequency performance. Fairchild has evaluation boards to use as a guide for high frequency layout and to aid in device testing and characterization. Follow the steps below as a basis for high frequency layout: Include 6.8F and 0.01F ceramic capacitors I Place the 6.8F capacitor within 0.75 inches of the power pin I Place the 0.01F capacitor within 0.1 inches of the power pin I Remove the ground plane under and around the part, especially near the input and output pins to reduce parasitic capacitance I Minimize all trace lengths to reduce series inductances I The KEB002 evaluation board is built for dual supply operation. Follow these steps to use the board in a single supply application: 1. Short -Vs to ground 2. Use C3 and C4, if the -Vs pin of the KM4112 is not directly connected to the ground plane. Refer to the evaluation board layouts shown in Figure 6 for more information. Evaluation Board Information The following evaluation boards are available to aid in the testing and layout of this device: Eval Board KEB002 Description Products Single Channel, KM4112IT5 Dual Supply 5 & 6 lead SOT23 Evaluation board schematics and layouts are shown in Figure 5 and Figure 6. Figure 5: Evaluation Board Schematic REV. 2 July 2001 7 DATA SHEET KM4112 KM4112 Evaluation Board Layout Figure 6a: KEB002 (top side) Figure 6b: KEB002 (bottom side) KM4112 Package Dimensions b C L e DATUM 'A' 2 SOT23-5 C L E C L E1 e1 D C L C SYMBOL A A1 A2 b C D E E1 L e e1 MIN 0.90 0.00 0.90 0.25 0.09 2.80 2.60 1.50 0.35 MAX 1.45 0.15 1.30 0.50 0.20 3.10 3.00 1.75 0.55 0.95 ref 1.90 ref 0 10 NOTE: 1. All dimensions are in millimeters. 2 Foot length measured reference to flat foot surface parallel to DATUM 'A' and lead surface. 3. Package outline exclusive of mold flash & metal burr. 4. Package outline inclusive of solder plating. 5. Comply to EIAJ SC74A. 6. Package ST 0003 REV A supercedes SOT-D-2005 REV C. A A2 A1 8 REV. 2 July 2001 KM4112 DATA SHEET Ordering Information Model KM4112 KM4112 Part Number KM4112IT5 KM4112IT5TR3 Package Container Pack Qty <3000 3000 SOT23-5 Partial Reel SOT23-5 Reel Temperature range for all parts: -40C to +85C DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICES TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com (c) 2001 Fairchild Semiconductor Corporation |
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