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Precision Micropower, Low Noise CMOS Rail-to-Rail Input/Output Operational Amplifiers
AD8603/AD8607/AD8609
FEATURES
Low offset voltage: 50 V max Low input bias current: 1 pA max Single-supply operation: 1.8 V to 5 V Low noise: 22 nV/Hz Micropower: 50 A max Low distortion No phase reversal Unity gain stable
PIN CONFIGURATIONS
OUT 1 V- 2 +IN 3
AD8603
TOP VIEW (Not to Scale)
5
V+
4
-IN
Figure 1. 5-Lead TSOT-23 (UJ Suffix)
OUT A 1
-IN A 2
8
V+ OUT B
04356-002
04356-003
AD8607
TOP VIEW (Not to Scale)
7 6 5
APPLICATIONS
Battery-powered instrumentation Multipole filters Sensors Low power ASIC input or output amplifiers
+IN A 3 V- 4
-IN B +IN B
Figure 2. 8-Lead MSOP (RM Suffix)
OUT A 1
8
V+ OUT B
GENERAL DESCRIPTION
The AD8603/AD8607/AD8609 are single/dual/quad micropower rail-to-rail input and output amplifiers, respectively, that feature very low offset voltage as well as low input voltage and current noise. These amplifiers use a patented trimming technique that achieves superior precision without laser trimming. The parts are fully specified to operate from 1.8 V to 5.0 V single supply or from 0.9 V to 2.5 V dual supply. The combination of low offsets, low noise, very low input bias currents, and low power consumption make the AD8603/AD8607/AD8609 especially useful in portable and loop-powered instrumentation. The ability to swing rail-to-rail at both the input and output enables designers to buffer CMOS ADCs, DACs, ASICs, and other wide output swing devices in low power, single-supply systems. The AD8603 is available in a tiny 5-lead TSOT-23 package. The AD8607 is available in 8-lead MSOP and 8-lead SOIC packages. The AD8609 is available in 14-lead TSSOP and 14-lead SOIC packages.
-IN A 2
+IN A 3
AD8607
7
6 -IN B TOP VIEW V- 4 (Not to Scale) 5 +IN B
Figure 3. 8-Lead SOIC_N (R Suffix)
OUT A 1
-IN A 2
14 13
OUT D -IN D +IN D V- +IN C -IN C OUT C
04356-004
+IN A 3 V+ 4 +IN B 5 -IN B 6 OUT B 7
AD8609
TOP VIEW (Not to Scale)
12 11 10 9 8
Figure 4. 14-Lead TSSOP (RU Suffix)
OUT A -IN A
1 2
14 OUT D 13 -IN D
+IN A 3 V+ 4 +IN B 5 -IN B OUT B
6 7
AD8609
12 +IN D
TOP VIEW 11 V- (Not to Scale) 10 +IN C
04356-005
9 8
-IN C OUT C
Figure 5. 14-Lead SOIC_N (R Suffix)
Rev. B
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.
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) 2005 Analog Devices, Inc. All rights reserved.
04356-001
AD8603/AD8607/AD8609 TABLE OF CONTENTS
Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Typical Performance Characteristics ............................................. 6 Applications..................................................................................... 12 No Phase Reversal ...................................................................... 12 Input Overvoltage Protection ................................................... 12 Driving Capacitive Loads.......................................................... 12 Proximity Sensors....................................................................... 13 Composite Amplifiers................................................................ 13 Battery-Powered Applications .................................................. 14 Photodiodes ................................................................................ 14 Outline Dimensions ....................................................................... 15 Ordering Guide .......................................................................... 17
REVISION HISTORY
6/05--Rev. A to Rev. B Updated Figure 49 .......................................................................... 15 Changes to Ordering Guide .......................................................... 17 10/03--Rev. 0 to Rev. A Added AD8607 and AD8609 Parts ..................................Universal Changes to Specifications ................................................................ 3 Changes to Figure 35...................................................................... 10 Added Figure 41.............................................................................. 11 8/03--Revision 0: Initial Version
Rev. B | Page 2 of 20
AD8603/AD8607/AD8609 SPECIFICATIONS
Electrical Characteristics @ VS = 5 V, VCM = VS/2, TA = 25C, unless otherwise noted. Table 1.
Parameter INPUT CHARACTERISTICS Offset Voltage Symbol VOS Conditions VS = 3.3 V @ VCM = 0.5 V and 2.8 V -0.3 V < VCM < +5.2 V -40C < TA < +125C, -0.3 V < VCM < +5.2 V -40C < TA < +125C -40C < TA < +85C -40C < TA < +125C Input Offset Current IOS -40C < TA < +85C -40C < TA < +125C Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain AD8603 AD8607/AD8609 Input Capacitance OUTPUT CHARACTERISTICS Output Voltage High IVR CMRR AVO 0 V < VCM < 5 V -40C < TA < +125C RL = 10 k, 0.5 V Offset Voltage Drift Input Bias Current
VOS/T IB
1000 450 1.9 2.5 4.97 4.97 16 160 80 36 100 40 30 50 250 330
Output Voltage Low
VOL
Output Current Closed-Loop Output Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Settling Time 0.1% Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Current Noise Density Channel Separation
IOUT ZOUT PSRR ISY
50 60
SR tS GBP OO en p-p en in Cs
0.1 23 400 316 70 2.3 25 22 0.05 -115 -110
Rev. B | Page 3 of 20
AD8603/AD8607/AD8609
Electrical Characteristics @ VS = 1.8 V, VCM = VS/2, TA = 25C, unless otherwise noted. Table 2.
Parameter INPUT CHARACTERISTICS Offset Voltage Symbol VOS Conditions VS = 3.3 V @ VCM = 0.5 V and 2.8 V -0.3 V < VCM < +1.8 V -40C < TA < +85C, -0.3 V < VCM < +1.8 V -40C < TA < +125C, -0.3 V < VCM < +1.7 V -40C < TA < +125C -40C < TA < +85C -40C < TA < +125C Input Offset Current IOS -40C < TA < +85C -40C < TA < +125C Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain AD8603 AD8607/AD8609 Input Capacitance OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Output Current Closed-Loop Output Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Settling Time 0.1% Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Current Noise Density Channel Separation IVR CMRR AVO 0 V < VCM < 1.8 V -40C < TA < +85C RL = 10 k, 0.5 V Offset Voltage Drift Input Bias Current
VOS/T IB
1 0.2
3000 2000 2.1 3.8 1.72 38 7 36 100 40 60 80
50 60
SR tS GBP OO en p-p en in Cs
0.1 9.2 385 316 70 2.3 25 22 0.05 -115 -110
Rev. B | Page 4 of 20
AD8603/AD8607/AD8609 ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter 1 Supply Voltage Input Voltage Differential Input Voltage Output Short-Circuit Duration to GND Storage Temperature Range All Packages Lead Temperature (Soldering, 60 sec) Operating Temperature Range Junction Temperature Range All Packages
1
Table 4. Package Characteristics
Rating 6V GND to VS 6 V Indefinite -65C to +150C 300C -40C to +125C -65C to +150C Package Type 5-Lead TSOT-23 (UJ) 8-Lead MSOP (RM) 8-Lead SOIC_N (R) 14-Lead SOIC_N (R) 14-Lead TSSOP (RU)
1
JA 1 207 210 158 120 180
JC 61 45 43 36 35
Unit C/W C/W C/W C/W C/W
JA is specified for the worst-case conditions, that is, JA is specified for device soldered in circuit board for surface-mount packages.
Absolute maximum ratings apply at 25C, unless otherwise noted.
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.
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. B | Page 5 of 20
AD8603/AD8607/AD8609 TYPICAL PERFORMANCE CHARACTERISTICS
2600 2400 2200 2000
NUMBER OF AMPLIFIERS
300 VS = 5V TA = 25C VCM = 0V TO 5V 250 200 150 100 50 VS = 3.3V TA = 25C
1800 1600
VOS (V)
1400 1200 1000 800 600 400 200 -270 -210 -150 -90 -30 0 30 VOS (V) 90 150 210 270
04356-006
0 -50 -100 -150 -200 -250 0.3 0.6 0.9 1.2 1.5 1.8 VCM (V) (V) 2.1 2.4 2.7 3.0 3.3
04356-009
04356-011
0
-300 0.0
Figure 6. Input Offset Voltage Distribution
30
Figure 9. Input Offset Voltage vs. Common-Mode Voltage
400 350
25
NUMBERS OF AMPLIFIERS
20
INPUT BIAS CURRENT (pA)
VS = 2.5V TA = -40C TO +125C VCM = 0V
VS = 2.5V
300 250 200 150 100 50
15
10
5
04356-007
0
0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2 TCVOS (V/C)
0
25
75 50 TEMPERATURE (C)
100
125
Figure 7. Input Offset Voltage Drift Distribution
Figure 10. Input Bias vs. Temperature
300
OUTPUT VOLTAGE TO SUPPLY RAIL (mV)
1000
VS = 5V TA = 25C
250 200 150 100 50
VS = 5V TA = 25C 100
10 SINK SOURCE 1
VOS (V)
0 -50 -100 -150 -200 -250 0.5 1.0 1.5 2.0 2.5 3.0 VCM (V) 3.5 4.0 4.5 5.0
04356-008
0.1
-300 0.0
0.01 0.001
0.01
0.1 LOAD CURRENT (mA)
1
10
Figure 8. Input Offset Voltage vs. Common-Mode Voltage
Figure 11. Output Voltage to Supply Rail vs. Load Current
Rev. B | Page 6 of 20
04356-010
0
0
AD8603/AD8607/AD8609
350 VS = 5V TA = 25C 300
1575
OUTPUT IMPEDANCE ()
1925 1750 VS = 2.5V, 0.9V
250
VDD - VOH @ 10mA LOAD
OUTPUT SWING (mV)
1400 1225 1050 A = 100 875 700 A = 10 525 A=1
200 VOL @ 10mA LOAD 150 100
50 0 -40 -25
VDD - VOH @ 1mA LOAD
04356-012
350
-10
5
20 35 50 65 TEMPERATURE (C)
80
95
110
125
1k
10k FREQUENCY (Hz)
100k
Figure 12. Output Voltage Swing vs. Temperature
140 120 100 80 PHASE (Degree)
CMRR (dB)
Figure 15. Output Impedance vs. Frequency
100 80 60 OPEN-LOOP GAIN (dB) 40 20 0 -20 -40 -60 -80 -100 1k
VS = 2.5V RL = 100k CL = 20pF = 70.9
225 180 135 90 45 0 -45 -90 -135 -180
04356-013
VS = 2.5V
60 40 20 0 -20 -40 1k 10k FREQUENCY (Hz) 100k
04356-016 04356-017
10k
100k FREQUENCY (Hz)
1M
-225 10M
-60 100
Figure 13. Open-Loop Gain and Phase vs. Frequency
Figure 16. Common-Mode Rejection Ratio vs. Frequency
140
5.0 4.5 4.0 VS = 5V VIN = 4.9V p-p T = 25C AV = 1
120 100 80
PSRR (dB)
VS = 2.5V
OUTPUT SWING (V p-p)
3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.1 1 FREQUENCY (kHz) 10 100
04356-014
60 40 20 0 -20 -40 -60 10 100 1k FREQUENCY (Hz) 10k 100k
0.0 0.01
Figure 14. Closed-Loop Output Voltage Swing vs. Frequency
Figure 17. PSRR vs. Frequency
Rev. B | Page 7 of 20
04356-015
VOL @ 1mA LOAD
175 100
AD8603/AD8607/AD8609
60 VS = 5V 50
VS = 5V, 1.8V
SMALL SIGNAL OVERSHOOT (%)
40 OS- 30
20 OS+ 10
100 LOAD CAPACITANCE (pF)
1000
04356-018
TIME (1s/DIV)
Figure 18. Small Signal Overshoot vs. Load Capacitance
Figure 21. 0.1 Hz to 10 Hz Input Voltage Noise
60 55 50 45 SUPPLY CURRENT (A) 40 35 30 25 20 15 10 5 -25 -10 5 20 35 50 65 TEMPERATURE (C) 80 95 110 125
04356-019
04356-022
VS = 2.5V
VS = 5V RL = 10k CL = 200pF AV = 1
VOLTAGE (50mV/DIV)
0 -40
TIME (4s/DIV)
Figure 19. Supply Current vs. Temperature
Figure 22. Small Signal Transient
100 90 80 TA = 25C
VS = 5V RL = 10k CL = 200pF AV = 1
VOLTAGE (1V/DIV)
SUPPLY CURRENT (A)
70 60 50 40 30 20 10
04356-020
04356-023
0 0 1.0 2.0 3.0 SUPPLY VOLTAGE (V) 4.0 5.0
TIME (20s/DIV)
Figure 20. Supply Current vs. Supply Voltage
Figure 23. Large Signal Transient
Rev. B | Page 8 of 20
04356-021
0 10
VOLTAGE NOISE (1V/DIV)
AD8603/AD8607/AD8609
VOUT (V)
+2.5V
VOLTAGE NOISE DENSITY (nV/ Hz)
VS = 2.5V RL = 10k AV = 100 VIN = 50mV
176 VS = 2.5V 154 132 110 88 66 44 22
04356-024
0V 0V
VIN (mV)
-50mV
TIME (4s/DIV)) (40s/DIV)
0
1
2
3
4 5 6 FREQUENCY (kHz)
7
8
9
10
Figure 24. Negative Overload Recovery
Figure 27. Voltage Noise Density vs. Frequency
VOUT (V)
VS = 2.5V RL = 10k AV = 100 VIN = 50mV
800 750
+2.5V
NUMBER OF AMPLIFIERS
700 650 600 550 500 450 400 350 300 250 200 150 100 50 0 -300 -240 -180 -120
VS = 1.8V TA = 25C VCM = 0V to 1.8V
0V 0V
VIN (mV)
-50mV
04356-025
TIME (4s/DIV)
-60
0 60 VOS (V)
120
180
240
300
Figure 25. Positive Overload Recovery
Figure 28. VOS Distribution
168 VS = 2.5V
VOLTAGE NOISE DENSITY (nV/ Hz)
300 250 200 150 100
VOS (V)
144
VS = 1.8V TA = 25C
120
96
50 0 -50 -100
72 48
-150 -200 -250
04356-026
24 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 FREQUENCY (kHz) 0.8 0.9 1.0
0
0.3
0.6
0.9 VCM (V) VCM (V)
1.2
1.5
1.8
Figure 26. Voltage Noise Density vs. Frequency
Figure 29. Input Offset Voltage vs. Common-Mode Voltage
Rev. B | Page 9 of 20
04356-029
-300
04356-028
04356-027
0
AD8603/AD8607/AD8609
1000
OUTPUT VOLTAGE TO SUPPLY RAIL (mV)
100
VS = 1.8V TA = 25C
80 60 OPEN-LOOP GAIN (dB) 40 20 0 -20 -40 -60 -80
04356-030
100
VS = 0.9V RL = 100k CL = 20pF = 70
225 180 135 90 45 0 -45 -90 -135 -180
04356-033
10
SOURCE SINK
1
0.1
0.01 0.001
0.01
0.1 LOAD CURRENT (mA)
1
10
-100
1
10
100 FREQUENCY (Hz)
1M
-225 10M
Figure 30. Output Voltage to Supply Rail vs. Load Current
100 90 VS = 1.8V 80
OUTPUT SWING (mV)
Figure 33. Open-Loop Gain and Phase vs. Frequency
140 120 VS = 1.8V 100
VDD - VOH @ 1mA LOAD
70 60 50 40 30 20 10
80 60
CMRR (dB)
40 20 0 -20 -40
VOL @ 1mA LOAD
04356-031
-10
5
50 65 20 35 TEMPERATURE (C)
80
95
110
125
1k
10k FREQUENCY (Hz)
100k
Figure 31. Output Voltage Swing vs. Temperature
60 VS = 1.8V TA = 25C AV = 1
Figure 34. Common-Mode Rejection Ratio vs. Frequency
1.8 VS = 1.8V VIN = 1.7V p-p T = 25C AV = 1
50
SMALL SIGNAL OVERSHOOT (%)
1.5
40
OUTPUT SWING (V p-p)
1.2
30 OS- 20 OS+ 10
0.9
0.6
0.3
100 LOAD CAPACITANCE (pF)
1000
04356-032
0.1
1 FREQUENCY (kHz)
10
100
Figure 32. Small Signal Overshoot vs. Load Capacitance
Figure 35. Closed-Loop Output Voltage Swing vs. Frequency
Rev. B | Page 10 of 20
04356-035
0 10
0.0 0.01
04356-034
0 -40 -25
-60 100
PHASE (Degree)
AD8603/AD8607/AD8609
176 VS = 0.9V VS = 1.8V RL = 10k CL = 200pF AV = 1 154
VOLTAGE NOISE DENSITY (nV/ Hz)
132 110 88 66 44 22
04356-039 04356-040
VOLTAGE (50mV/DIV)
04356-036
0 0 1 2 3 4 5 6 FREQUENCY (kHz) 7 8 9 10
TIME (4s/DIV)
Figure 36. Small Signal Transient
Figure 39. Voltage Noise Density
0
VS = 1.8V RL = 10k CL = 200pF AV = 1
VS = 2.5V, 0.9V -20
CHANNEL SEPARATION (dB)
04356-037
VOLTAGE (500mV/DIV)
-40 -60
-80 -100
-120 -140 100
1k
TIME (20s/DIV)
10k FREQUENCY (Hz)
100k
1M
Figure 37. Large Signal Transient
168 VS = 0.9V
Figure 40. Channel Separation
VOLTAGE NOISE DENSITY (nV/ Hz)
140
112
84
56
28
0
0.1
0.2
0.3
0.4 0.5 0.6 0.7 FREQUENCY (kHz)
0.8
0.9
1.0
Figure 38. Voltage Noise Density
04356-038
0
Rev. B | Page 11 of 20
AD8603/AD8607/AD8609 APPLICATIONS
NO PHASE REVERSAL
The AD8603/AD8607/AD8609 do not exhibit phase inversion even when the input voltage exceeds the maximum input common-mode voltage. Phase reversal can cause permanent damage to the amplifier, resulting in system lockups. The AD8603/AD8607/AD8609 can handle voltages of up to 1 V over the supply. The use of the snubber circuit is usually recommended for unity gain configurations. Higher gain configurations help improve the stability of the circuit. Figure 44 shows the same output response with the snubber in place.
VS = 0.9V VIN = 100mV CL = 2nF RL = 10k
VIN
VS = 2.5V VIN = 6V p-p AV = 1 RL = 10k
VOLTAGE (1V/DIV)
VOUT
Figure 42. Output Response to a 2 nF Capacitive Load, Without Snubber
04356-041
TIME (4s/DIV)
VEE
Figure 41. No Phase Response
INPUT OVERVOLTAGE PROTECTION
If a voltage 1 V higher than the supplies is applied at either input, the use of a limiting series resistor is recommended. If both inputs are used, each one should be protected with a series resistor. To ensure good protection, the current should be limited to a maximum of 5 mA. The value of the limiting resistor can be determined from the equation (VIN - VS)/(RS + 200 ) 5 mA
200mV + -
V- V+
RS 150 VCC C S 47pF
CL
04356-043
Figure 43. Snubber Network
VSY = 0.9V VIN = 100mV CL = 2nF RL = 10k RS = 150 CS = 470pF
DRIVING CAPACITIVE LOADS
The AD8603/AD8607/AD8609 are capable of driving large capacitive loads without oscillating. Figure 42 shows the output of the AD8603/AD8607/AD8609 in response to a 100 mV input signal, with a 2 nF capacitive load. Although it is configured in positive unity gain (the worst case), the AD8603 shows less than 20% overshoot. Simple additional circuitry can eliminate ringing and overshoot. One technique is the snubber network, which consists of a series RC and a resistive load (see Figure 43). With the snubber in place, the AD8603/AD8607/AD8609 are capable of driving capacitive loads of 2 nF with no ringing and less than 3% overshoot.
Figure 44. Output Response to a 2 nF Capacitive Load, With Snubber
Rev. B | Page 12 of 20
04356-044
04356-042
AD8603/AD8607/AD8609
Optimum values for RS and CS are determined empirically; Table 5 lists a few starting values. Table 5. Optimum Values for the Snubber Network
CL (pF) 100~500 1500 1600~2000 RS () 500 100 400 CS (pF) 680 330 100
COMPOSITE AMPLIFIERS
A composite amplifier can provide a very high gain in applications where high closed-loop dc gains are needed. The high gain achieved by the composite amplifier comes at the expense of a loss in phase margin. Placing a small capacitor, CF, in the feedback in parallel with R2 (Figure 45) improves the phase margin. Picking CF = 50 pF yields a phase margin of about 45 for the values shown in Figure 45. A composite amplifier can be used to optimize dc and ac characteristics. Figure 46 shows an example using the AD8603 and the AD8541. This circuit offers many advantages. The bandwidth is increased substantially, and the input offset voltage and noise of the AD8541 become insignificant since they are divided by the high gain of the AD8603. The circuit of Figure 46 offers a high bandwidth (nearly double that of the AD8603), a high output current, and a very low power consumption of less than 100 A.
R2 100k
PROXIMITY SENSORS
Proximity sensors can be capacitive or inductive and are used in a variety of applications. One of the most common applications is liquid level sensing in tanks. This is particularly popular in pharmaceutical environments where a tank must know when to stop filling or mixing a given liquid. In aerospace applications, these sensors detect the level of oxygen used to propel engines. Whether in a combustible environment or not, capacitive sensors generally use low voltage. The precision and low voltage of the AD8603/AD8607/AD8609 make the parts an excellent choice for such applications.
R1 1k
R2 VEE 99k VCC U5
V+ V-
VEE
AD8603
R1 1k VIN
V- V+
VCC R3 1k VCC C2
V+ V-
R4
V- V+
AD8603
VCC
AD8541
100 AD8541 VEE C3
04356-046
VIN
R3 1k
99k
04356-045
VEE R4
Figure 45. High Gain Composite Amplifier
Figure 46. Low Power Composite Amplifier
Rev. B | Page 13 of 20
AD8603/AD8607/AD8609
BATTERY-POWERED APPLICATIONS
The AD8603/AD8607/AD8609 are ideal for battery-powered applications. The parts are tested at 5 V, 3.3 V, 2.7 V, and 1.8 V and are suitable for various applications whether in single or dual supply. In addition to their low offset voltage and low input bias, the AD8603/AD8607/AD8609 have a very low supply current of 40 A, making the parts an excellent choice for portable electronics. The TSOT package allows the AD8603 to be used on smaller board spaces. Figure 47 shows a simple photodiode circuit. The feedback capacitor helps the circuit maintain stability. The signal bandwidth can be increased at the expense of an increase in the total noise; a low-pass filter can be implemented by a simple RC network at the output to reduce the noise. The signal bandwidth can be calculated by 1/2R2C2 and the closed-loop bandwidth is the intersection point of the open-loop gain and the noise gain. The circuit shown in Figure 47 has a closed-loop bandwidth of 58 kHz and a signal bandwidth of 16 Hz. Increasing C2 to 50 pF yields a closed-loop bandwidth of 65 kHz, but only 3.2 Hz of signal bandwidth can be achieved.
C2 10pF
PHOTODIODES
Photodiodes have a wide range of applications from bar code scanners to precision light meters and CAT scanners. The very low noise and low input bias current of the AD8603/AD8607/ AD8609 make the parts very attractive amplifiers for I-V conversion applications.
R2 1000M VCC
AD8603
C1 10pF
VEE
Figure 47. Photodiode Circuit
Rev. B | Page 14 of 20
04356-047
R1 1000M
AD8603/AD8607/AD8609 OUTLINE DIMENSIONS
5.00 (0.1968) 4.80 (0.1890)
8 5 4
4.00 (0.1574) 3.80 (0.1497) 1
6.20 (0.2440) 5.80 (0.2284)
1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040)
1.75 (0.0688) 1.35 (0.0532)
0.50 (0.0196) x 45 0.25 (0.0099)
0.51 (0.0201) COPLANARITY SEATING 0.31 (0.0122) 0.10 PLANE
8 0.25 (0.0098) 0 1.27 (0.0500) 0.40 (0.0157) 0.17 (0.0067)
COMPLIANT TO JEDEC STANDARDS MS-012-AA 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 48. 8-Lead Standard Small Outline Package [SOIC_N] (R-8) Dimensions shown in millimeters and (inches)
2.90 BSC
5
4
1.60 BSC
1 2 3
2.80 BSC
PIN 1 0.95 BSC *0.90 0.87 0.84 1.90 BSC
*1.00 MAX
0.20 0.08 8 4 0 0.60 0.45 0.30
0.10 MAX
0.50 0.30
SEATING PLANE
*COMPLIANT TO JEDEC STANDARDS MO-193-AB WITH THE EXCEPTION OF PACKAGE HEIGHT AND THICKNESS.
Figure 49. 5-Lead Thin Small Outline Transistor Package [TSOT] (UJ-5) Dimensions shown in millimeters
3.00 BSC
8
5
3.00 BSC
1
4.90 BSC
4
PIN 1 0.65 BSC 1.10 MAX 8 0 0.80 0.60 0.40
0.15 0.00 0.38 0.22 COPLANARITY 0.10
0.23 0.08 SEATING PLANE
COMPLIANT TO JEDEC STANDARDS MO-187-AA
Figure 50. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters
Rev. B | Page 15 of 20
AD8603/AD8607/AD8609
8.75 (0.3445) 8.55 (0.3366)
14 1 8 7
4.00 (0.1575) 3.80 (0.1496)
6.20 (0.2441) 5.80 (0.2283)
0.25 (0.0098) 0.10 (0.0039)
1.27 (0.0500) BSC
1.75 (0.0689) 1.35 (0.0531)
0.50 (0.0197) x 45 0.25 (0.0098)
COPLANARITY 0.10
0.51 (0.0201) 0.31 (0.0122)
SEATING PLANE
8 0.25 (0.0098) 0 1.27 (0.0500) 0.40 (0.0157) 0.17 (0.0067)
COMPLIANT TO JEDEC STANDARDS MS-012-AB 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 51. 14-Lead Standard Small Outline Package [SOIC_N] (R-14) Dimensions shown in millimeters and (inches)
5.10 5.00 4.90
14
8
4.50 4.40 4.30
1 7
6.40 BSC
PIN 1 1.05 1.00 0.80 0.65 BSC 1.20 MAX 0.15 0.05 0.30 0.19 0.20 0.09 8 0 0.75 0.60 0.45
SEATING COPLANARITY PLANE 0.10
COMPLIANT TO JEDEC STANDARDS MO-153-AB-1
Figure 52. 14-Lead Thin Shrink Small Outline Package [TSSOP] (RU-14) Dimensions shown in millimeters
Rev. B | Page 16 of 20
AD8603/AD8607/AD8609
ORDERING GUIDE
Model AD8603AUJ-R2 AD8603AUJ-REEL AD8603AUJ-REEL7 AD8603AUJZ-R2 1 AD8603AUJZ-REEL1 AD8603AUJZ-REEL71 AD8607ARM-R2 AD8607ARM-REEL AD8607ARMZ-R21 AD8607ARMZ-REEL1 AD8607AR AD8607AR-REEL AD8607AR-REEL7 AD8607ARZ1 AD8607ARZ-REEL1 AD8607ARZ-REEL71 AD8609AR AD8609AR-REEL AD8609AR-REEL7 AD8609ARZ1 AD8609ARZ-REEL1 AD8609ARZ-REEL71 AD8609ARU AR8609ARU-REEL AD8609ARUZ1 AR8609ARUZ-REEL1
1
Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C
Package Description 5-Lead TSOT-23 5-Lead TSOT-23 5-Lead TSOT-23 5-Lead TSOT-23 5-Lead TSOT-23 5-Lead TSOT-23 8-Lead MSOP 8-Lead MSOP 8-Lead MSOP 8-Lead MSOP 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 14-Lead SOIC_N 14-Lead SOIC_N 14-Lead SOIC_N 14-Lead SOIC_N 14-Lead SOIC_N 14-Lead SOIC_N 14-Lead TSSOP 14-Lead TSSOP 14-Lead TSSOP 14-Lead TSSOP
Package Option UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 RM-8 RM-8 RM-8 RM-8 R-8 R-8 R-8 R-8 R-8 R-8 R-14 R-14 R-14 R-14 R-14 R-14 RU-14 RU-14 RU-14 RU-14
Branding BFA BFA BFA A0X A0X A0X A00 A00 A0G A0G
Z = Pb-free part.
Rev. B | Page 17 of 20
AD8603/AD8607/AD8609 NOTES
Rev. B | Page 18 of 20
AD8603/AD8607/AD8609 NOTES
Rev. B | Page 19 of 20
AD8603/AD8607/AD8609 NOTES
(c) 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C04356-0-6/05(B)
Rev. B | Page 20 of 20

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