AD8607ARZ [ADI]
Precision Micropower, Low Noise CMOS Rail-to-Rail Input/Output Operational Amplifiers; 精密微功耗，低噪声CMOS轨到轨输入/输出运算放大器
| 型号： | AD8607ARZ |
| 厂家： | 
ADI |
| 描述： | Precision Micropower, Low Noise CMOS Rail-to-Rail Input/Output Operational Amplifiers |
| 文件： | 总20页 (文件大小：458K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Precision Micropower, Low Noise CMOS
Rail-to-Rail Input/Output Operational Amplifiers
AD8603/AD8607/AD8609
FEATURES
PIN CONFIGURATIONS
Low offset voltage: 50 μV max
Low input bias current: 1 pA max
Single-supply operation: 1.8 V to 5 V
Low noise: 22 nV/√Hz
Micropower: 50 μA max
Low distortion
OUT
V–
1
2
3
5
V+
AD8603
TOP VIEW
(Not to Scale)
+IN
4
–IN
Figure 1. 5-Lead TSOT-23 (UJ Suffix)
No phase reversal
Unity gain stable
OUT A
–IN A
+IN A
V–
1
2
3
4
8
7
6
5
V+
AD8607
OUT B
–IN B
+IN B
TOP VIEW
APPLICATIONS
Battery-powered instrumentation
(Not to Scale)
Multipole filters
Sensors
Figure 2. 8-Lead MSOP (RM Suffix)
Low power ASIC input or output amplifiers
OUT A
IN A
+IN A
1
2
3
4
8
7
6
5
V+
AD8607
–
OUT B
GENERAL DESCRIPTION
–IN B
TOP VIEW
(Not to Scale)
The AD8603/AD8607/AD8609 are single/dual/quad micro-
power rail-to-rail input and output amplifiers, respectively, that
feature very low offset voltage as well as low input voltage and
current noise.
V
–
+IN B
Figure 3. 8-Lead SOIC_N (R Suffix)
1
2
3
4
5
6
7
OUT A
IN A
14
13
12
11
OUT D
–IN D
+IN D
V–
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 ±±.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.
–
+IN A
V+
AD8609
TOP VIEW
(Not to Scale)
+IN B
–IN B
OUT B
10 +IN C
9
8
–IN C
OUT C
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.
Figure 4. 14-Lead TSSOP (RU Suffix)
OUT A
–IN A
+IN A
V+
1
2
3
4
5
6
7
14 OUT D
13 –IN D
12 +IN D
11 V–
AD8609
TOP VIEW
The AD8603 is available in a tiny 5-lead TSOT-±3 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.
(Not to Scale)
+IN B
–IN B
OUT B
10 +IN C
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
Fax: 781.461.3113
www.analog.com
© 2005 Analog Devices, Inc. All rights reserved.
AD8603/AD8607/AD8609
TABLE OF CONTENTS
Specifications..................................................................................... 3
Driving Capacitive Loads.......................................................... 1±
Proximity Sensors....................................................................... 13
Composite Amplifiers................................................................ 13
Battery-Powered Applications.................................................. 14
Photodiodes ................................................................................ 14
Outline Dimensions....................................................................... 15
Ordering Guide .......................................................................... 17
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Typical Performance Characteristics ............................................. 6
Applications..................................................................................... 1±
No Phase Reversal ...................................................................... 1±
Input Overvoltage Protection ................................................... 1±
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/±, TA = ±5°C, unless otherwise noted.
Table 1.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
INPUT CHARACTERISTICS
Offset Voltage
VOS
VS = 3.3 V @ VCM = 0.5 V and 2.8 V
–0.3 V < VCM < +5.2 V
–40°C < TA < +125°C, –0.3 V < VCM < +5.2 V
–40°C < TA < +125°C
12
40
50
μV
μV
μV
μV/°C
pA
pA
pA
pA
pA
pA
V
300
700
4.5
1
Offset Voltage Drift
Input Bias Current
∆VOS/∆T
IB
1
0.2
–40°C < TA < +85°C
–40°C < TA < +125°C
50
500
0.5
50
250
+5.2
Input Offset Current
IOS
0.1
–40°C < TA < +85°C
–40°C < TA < +125°C
Input Voltage Range
Common-Mode Rejection Ratio
IVR
CMRR
–0.3
85
80
0 V < VCM < 5 V
–40°C < TA < +125°C
RL = 10 kΩ, 0.5 V <VO < 4.5 V
100
dB
dB
Large Signal Voltage Gain
AD8603
AD8607/AD8609
Input Capacitance
AVO
400
250
1000
450
1.9
V/mV
V/mV
pF
CDIFF
CCM
2.5
pF
OUTPUT CHARACTERISTICS
Output Voltage High
VOH
IL = 1 mA
–40°C to +125°C
IL = 10 mA
–40°C to +125°C
IL = 1 mA
–40°C to +125°C
IL = 10 mA
4.95
4.9
4.65
4.50
4.97
4.97
16
V
V
V
V
mV
mV
mV
mV
mA
Ω
Output Voltage Low
VOL
30
50
250
330
160
–40°C to +125°C
Output Current
Closed-Loop Output Impedance
POWER SUPPLY
IOUT
ZOUT
80
36
f = 10 kHz, AV = 1
Power Supply Rejection Ratio
Supply Current/Amplifier
PSRR
ISY
1.8 V < VS < 5 V
VO = 0 V
–40°C <TA < +125°C
80
100
40
dB
μA
μA
50
60
DYNAMIC PERFORMANCE
Slew Rate
Settling Time 0.1%
Gain Bandwidth Product
SR
tS
GBP
RL = 10 kΩ
G = 1, 2 V Step
RL = 100 kΩ
RL = 10 kΩ
RL = 10 kΩ, RL = 100 kΩ
0.1
23
400
316
70
V/μs
μs
kHz
kHz
Degrees
Phase Margin
ØO
NOISE PERFORMANCE
Peak-to-Peak Noise
Voltage Noise Density
en p-p
en
0.1 Hz to 10 Hz
f = 1 kHz
f = 10 kHz
f = 1 kHz
f = 10 kHz
f = 100 kHz
2.3
25
22
0.05
–115
–110
3.5
μV
nV/√Hz
nV/√Hz
pA/√Hz
dB
Current Noise Density
Channel Separation
in
Cs
dB
Rev. B | Page 3 of 20
AD8603/AD8607/AD8609
Electrical Characteristics @ VS = 1.8 V, VCM = VS/±, TA = ±5°C, unless otherwise noted.
Table 2.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
INPUT CHARACTERISTICS
Offset Voltage
VOS
VS = 3.3 V @ VCM = 0.5 V and 2.8 V
–0.3 V < VCM < +1.8 V
–40°C < TA < +85°C, –0.3 V < VCM < +1.8 V
–40°C < TA < +125°C, –0.3 V < VCM < +1.7 V
–40°C < TA < +125°C
12
40
50
μV
μV
μV
μV
μV/°C
pA
pA
pA
pA
pA
pA
V
300
500
700
4.5
1
Offset Voltage Drift
Input Bias Current
∆VOS/∆T
IB
1
0.2
–40°C < TA < +85°C
–40°C < TA < +125°C
50
500
0.5
50
250
+1.8
Input Offset Current
IOS
0.1
98
–40°C < TA < +85°C
–40°C < TA < +125°C
Input Voltage Range
Common-Mode Rejection Ratio
IVR
CMRR
–0.3
80
70
0 V < VCM < 1.8 V
–40°C < TA < +85°C
dB
dB
Large Signal Voltage Gain
AD8603
AD8607/AD8609
Input Capacitance
AVO
RL = 10 kΩ, 0.5 V <VO < 4.5 V
150
100
3000
2000
2.1
V/mV
V/mV
pF
CDIFF
CCM
3.8
pF
OUTPUT CHARACTERISTICS
Output Voltage High
VOH
VOL
IL = 1 mA
–40°C to +125°C
IL = 1 mA
1.65
1.6
1.72
38
V
V
mV
mV
mA
Ω
Output Voltage Low
60
80
–40°C to +125°C
Output Current
Closed-Loop Output Impedance
POWER SUPPLY
IOUT
ZOUT
7
36
f = 10 kHz, AV = 1
Power Supply Rejection Ratio
Supply Current/Amplifier
PSRR
ISY
1.8 V < VS < 5 V
VO = 0 V
–40°C < TA < +85°C
80
100
40
dB
μA
μA
50
60
DYNAMIC PERFORMANCE
Slew Rate
Settling Time 0.1%
Gain Bandwidth Product
SR
tS
GBP
RL = 10 kΩ
G = 1, 1 V Step
RL = 100 kΩ
RL = 10 kΩ
RL = 10 kΩ, RL = 100 kΩ
0.1
9.2
385
316
70
V/μs
μs
kHz
kHz
Degrees
Phase Margin
ØO
NOISE PERFORMANCE
Peak-to-Peak Noise
Voltage Noise Density
en p-p
en
0.1 Hz to 10 Hz
f = 1 kHz
f = 10 kHz
f = 1 kHz
2.3
25
22
3.5
μV
nV/√Hz
nV/√Hz
pA/√Hz
Current Noise Density
Channel Separation
in
0.05
Cs
f = 10 kHz
f = 100 kHz
–115
–110
dB
dB
Rev. B | Page 4 of 20
AD8603/AD8607/AD8609
ABSOLUTE MAXIMUM RATINGS
Table 3.
Table 4. Package Characteristics
Package Type
Parameter1
Rating
6 V
GND to VS
6 V
θJA
θJC
61
45
43
36
35
Unit
°C/W
°C/W
°C/W
°C/W
°C/W
1
Supply Voltage
Input Voltage
5-Lead TSOT-23 (UJ)
8-Lead MSOP (RM)
8-Lead SOIC_N (R)
14-Lead SOIC_N (R)
14-Lead TSSOP (RU)
207
210
158
120
180
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
Indefinite
–65°C to +150°C
300°C
–40°C to +125°C
1 θJA is specified for the worst-case conditions, that is, θJA is specified for device
soldered in circuit board for surface-mount packages.
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.
–65°C to +150°C
1 Absolute maximum ratings apply at 25°C, unless otherwise noted.
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
300
250
200
150
100
50
V
T
= 3.3V
= 25°C
V
T
V
= 5V
= 25°C
S
A
S
2400
2200
2000
1800
1600
1400
A
= 0V TO 5V
CM
0
1200
1000
–50
–100
–150
800
600
400
–200
–250
–300
200
0
–270 –210 –150 –90 –30
V
0
30
90
150 210 270
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3
(μV)
V
((VV))
OS
CM
Figure 6. Input Offset Voltage Distribution
Figure 9. Input Offset Voltage vs. Common-Mode Voltage
30
25
20
15
10
5
400
350
300
V
= ±2.5V
S
V
T
= ±2.5V
= –40°C TO +125°C
= 0V
S
A
V
CM
250
200
150
100
50
0
0
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
0
25
50
75
100
125
TCVOS (μV/°C)
TEMPERATURE (°C)
Figure 7. Input Offset Voltage Drift Distribution
Figure 10. Input Bias vs. Temperature
300
250
200
150
100
50
1000
100
10
V
T
= 5V
= 25°C
S
A
V
T
= 5V
= 25°C
S
A
0
SINK
SOURCE
–50
1
0.1
–100
–150
–200
–250
–300
0.01
0.001
0.0
0.5
1.0
1.5
2.0
2.5
(V)
3.0
3.5
4.0
4.5
5.0
10
0.01
0.1
LOAD CURRENT (mA)
1
V
CM
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
AD8603/AD8607/AD8609
350
1925
1750
1575
1400
1225
V
T
= 5V
= 25°C
S
A
300
250
200
V = ±2.5V, ±0.9V
S
V
– V @ 10mA LOAD
OH
DD
V
@ 10mA LOAD
OL
1050
875
A = 100
150
100
50
700
A = 10
A = 1
525
350
175
V
– V @ 1mA LOAD
OH
DD
V
@ 1mA LOAD
95 110 125
OL
0
–40 –25 –10
5
20
35
50
65
80
100
1k
10k
FREQUENCY (Hz)
100k
TEMPERATURE (°C)
Figure 12. Output Voltage Swing vs. Temperature
Figure 15. Output Impedance vs. Frequency
140
120
100
80
100
80
225
180
V
R
C
= ±2.5V
= 100kΩ
= 20pF
S
V
= ±2.5V
L
S
L
φ = 70.9°
60
40
20
135
90
45
60
0
–20
–40
–60
–80
0
40
20
0
–45
–90
–135
–180
–20
–40
–60
–100
–225
10M
1k
10k
100k
1M
100
1k
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
Figure 13. Open-Loop Gain and Phase vs. Frequency
Figure 16. Common-Mode Rejection Ratio vs. Frequency
140
120
100
5.0
V
V
= 5V
= 4.9V p-p
S
V
= ±2.5V
4.5
4.0
3.5
3.0
2.5
2.0
1.5
S
IN
T = 25°C
= 1
A
V
80
60
40
20
0
–20
1.0
0.5
0.0
–40
–60
0.01
0.1
1
10
100
10
100
1k
10k
100k
FREQUENCY (kHz)
FREQUENCY (Hz)
Figure 14. Closed-Loop Output Voltage Swing vs. Frequency
Figure 17. PSRR vs. Frequency
Rev. B | Page 7 of 20
AD8603/AD8607/AD8609
60
V
= 5V
S
V
= 5V, 1.8V
S
50
40
30
20
10
0
OS–
OS+
10
100
LOAD CAPACITANCE (pF)
1000
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
V
= 5V
S
V
= ±2.5V
S
R
C
A
= 10kΩ
= 200pF
= 1
L
L
V
45
40
35
30
25
20
15
10
5
0
–40 –25 –10
5
20
35
50
65
80
95 110 125
TIME (4μs/DIV)
TEMPERATURE (°C)
Figure 19. Supply Current vs. Temperature
Figure 22. Small Signal Transient
100
90
V
= 5V
= 10kΩ
= 200pF
S
T
= 25°C
R
C
A
A
L
L
V
80
70
60
50
40
=
1
30
20
10
0
0
1.0
2.0
3.0
4.0
5.0
TIME (20μs/DIV)
SUPPLY VOLTAGE (V)
Figure 20. Supply Current vs. Supply Voltage
Figure 23. Large Signal Transient
Rev. B | Page 8 of 20
AD8603/AD8607/AD8609
176
154
132
110
88
V
R
A
= ±2.5V
= 10kΩ
= 100
S
V
= ±2.5V
S
L
V
+2.5V
V
= 50mV
IN
0V
0V
66
44
–50mV
22
0
0
1
2
3
4
5
6
7
8
9
10
μs/DIV))
TIME (40μs/DIV)
FREQUENCY (kHz)
Figure 24. Negative Overload Recovery
Figure 27. Voltage Noise Density vs. Frequency
800
V
R
A
= ±2.5V
= 10kΩ
= 100
S
750
700
650
600
550
L
V
= 1.8V
S
V
T
= 25°C
A
+2.5V
V
= 50mV
IN
V
= 0V to 1.8V
CM
0V
0V
500
450
400
350
300
250
200
150
100
–50mV
50
0
–300 –240 –180 –120 –60
0
60
120 180 240 300
TIME (4μs/DIV)
V
(μV)
OS
Figure 28. VOS Distribution
Figure 25. Positive Overload Recovery
168
300
250
200
150
100
50
V
= ±2.5V
S
V
T
= 1.8V
= 25°C
S
A
144
120
96
0
72
48
24
0
–50
–100
–150
–200
–250
–300
0
0.3
0.6
0.9
1.2
1.5
1.8
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
VV ((VV))
CCMM
FREQUENCY (kHz)
Figure 26. Voltage Noise Density vs. Frequency
Figure 29. Input Offset Voltage vs. Common-Mode Voltage
Rev. B | Page 9 of 20
AD8603/AD8607/AD8609
1000
100
80
225
180
V
R
C
= ±0.9V
= 100kΩ
= 20pF
S
V
T
= 1.8V
= 25°C
S
A
L
L
100
10
φ = 70°
60
40
20
135
90
45
SOURCE
SINK
0
–20
–40
–60
–80
0
1
0.1
–45
–90
–135
–180
0.01
0.001
–100
–225
10M
10
0.01
0.1
LOAD CURRENT (mA)
1
1
10
100
1M
FREQUENCY (Hz)
Figure 30. Output Voltage to Supply Rail vs. Load Current
Figure 33. Open-Loop Gain and Phase vs. Frequency
100
140
120
90
80
70
60
50
40
30
20
10
0
V
= 1.8V
V
= 1.8V
S
S
100
80
V
– V @ 1mA LOAD
OH
DD
60
40
20
V
@ 1mA LOAD
OL
0
–20
–40
–60
100
–10
–40 –25
5
20
35
50
65 80
95 110 125
1k
10k
FREQUENCY (Hz)
100k
TEMPERATURE (°C)
Figure 31. Output Voltage Swing vs. Temperature
Figure 34. Common-Mode Rejection Ratio vs. Frequency
60
50
40
30
20
10
0
1.8
1.5
1.2
0.9
0.6
V
T
A
= 1.8V
S
A
V
V
= 1.8V
S
= 25°C
= 1.7V p-p
IN
= 1
V
T = 25°C
= 1
A
V
OS–
OS+
0.3
0.0
10
100
LOAD CAPACITANCE (pF)
1000
0.01
0.1
1
10
100
FREQUENCY (kHz)
Figure 35. Closed-Loop Output Voltage Swing vs. Frequency
Figure 32. Small Signal Overshoot vs. Load Capacitance
Rev. B | Page 10 of 20
AD8603/AD8607/AD8609
176
154
132
110
88
V
= ±0.9V
S
V
= 1.8V
= 10kΩ
= 200pF
= 1
S
R
C
A
L
L
V
66
44
22
0
0
1
2
3
4
5
6
7
8
9
10
FREQUENCY (kHz)
TIME (4μs/DIV)
Figure 36. Small Signal Transient
Figure 39. Voltage Noise Density
0
V
= ±2.5V, ±0.9V
S
V
= 1.8V
= 10kΩ
= 200pF
= 1
S
–20
R
C
A
L
L
V
–40
–60
–80
–100
–120
–140
100
1k
10k
100k
1M
TIME (20μs/DIV)
FREQUENCY (Hz)
Figure 40. Channel Separation
Figure 37. Large Signal Transient
168
140
112
84
V
= ±0.9V
S
56
28
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
FREQUENCY (kHz)
Figure 38. Voltage Noise Density
Rev. B | Page 11 of 20
AD8603/AD8607/AD8609
APPLICATIONS
NO PHASE REVERSAL
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.
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.
V
V
C
= ±0.9V
= 100mV
= 2nF
S
IN
L
L
R
= 10kΩ
V
V
A
= ±2.5V
= 6V p-p
= 1
S
V
IN
IN
V
L
R
= 10kΩ
V
OUT
Figure 42. Output Response to a 2 nF Capacitive Load, Without Snubber
V
EE
TIME (4μs/DIV)
Figure 41. No Phase Response
V–
V+
R
150Ω
S
INPUT OVERVOLTAGE PROTECTION
C
L
200mV
V
+
CC
C
S
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.
–
47pF
Figure 43. Snubber Network
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
V
V
C
R
R
C
= ±0.9V
= 100mV
= 2nF
= 10kΩ
= 150Ω
= 470pF
SY
IN
L
L
S
S
(VIN – VS)/(RS + ±00 Ω) ≤ 5 mA
DRIVING CAPACITIVE LOADS
The AD8603/AD8607/AD8609 are capable of driving large
capacitive loads without oscillating. Figure 4± shows the output
of the AD8603/AD8607/AD8609 in response to a 100 mV input
signal, with a ± nF capacitive load.
Although it is configured in positive unity gain (the worst case),
the AD8603 shows less than ±0% overshoot. Simple additional
circuitry can eliminate ringing and overshoot.
Figure 44. Output Response to a 2 nF Capacitive Load, With Snubber
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 ± nF with no ringing and less than 3%
overshoot.
Rev. B | Page 12 of 20
AD8603/AD8607/AD8609
Optimum values for RS and CS are determined empirically;
Table 5 lists a few starting values.
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 R± (Figure 45) improves the
phase margin. Picking CF = 50 pF yields a phase margin of
about 45° for the values shown in Figure 45.
Table 5. Optimum Values for the Snubber Network
CL (pF)
RS (Ω)
CS (pF)
100~500
1500
500
100
680
330
1600~2000
400
100
PROXIMITY SENSORS
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.
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.
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 μA.
R2
100kΩ
R1
R2
V
EE
AD8603
1kΩ
99kΩ
V
V
EE
CC
R1
R3
V
–
1kΩ
V+
R4
V
V+
1kΩ
CC
V+
V
IN
U5
V–
AD8603
V
–
100Ω
AD8541
C3
C2
AD8541
V+
V
CC
V
–
V
EE
V
V
CC
IN
V
EE
R3
R4
1kΩ
99kΩ
Figure 46. Low Power Composite Amplifier
Figure 45. High Gain 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, ±.7 V, and 1.8 V
and are suitable for various applications whether in single or
dual supply.
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 ½πR±C± and the closed-loop bandwidth is
the intersection point of the open-loop gain and the noise gain.
In addition to their low offset voltage and low input bias, the
AD8603/AD8607/AD8609 have a very low supply current of
40 μA, making the parts an excellent choice for portable elec-
tronics. The TSOT package allows the AD8603 to be used on
smaller board spaces.
The circuit shown in Figure 47 has a closed-loop bandwidth of
58 kHz and a signal bandwidth of 16 Hz. Increasing C± to 50 pF
yields a closed-loop bandwidth of 65 kHz, but only 3.± Hz of
signal bandwidth can be achieved.
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.
C2 10pF
R2 1000MΩ
V
CC
AD8603
V
EE
Figure 47. Photodiode Circuit
Rev. B | Page 14 of 20
AD8603/AD8607/AD8609
OUTLINE DIMENSIONS
5.00 (0.1968)
4.80 (0.1890)
8
1
5
4
6.20 (0.2440)
5.80 (0.2284)
4.00 (0.1574)
3.80 (0.1497)
1.27 (0.0500)
BSC
0.50 (0.0196)
0.25 (0.0099)
× 45°
1.75 (0.0688)
1.35 (0.0532)
0.25 (0.0098)
0.10 (0.0040)
8°
0.51 (0.0201)
0.31 (0.0122)
0° 1.27 (0.0500)
COPLANARITY
0.10
0.25 (0.0098)
0.17 (0.0067)
SEATING
PLANE
0.40 (0.0157)
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
1
4
3
2.80 BSC
1.60 BSC
2
PIN 1
0.95 BSC
1.90
BSC
*
0.90
0.87
0.84
*
1.00 MAX
0.20
0.08
8°
4°
0°
0.10 MAX
0.60
0.45
0.30
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
1
5
4
4.90
BSC
3.00
BSC
PIN 1
0.65 BSC
1.10 MAX
0.15
0.00
0.80
0.60
0.40
8°
0°
0.38
0.22
0.23
0.08
COPLANARITY
0.10
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)
1.27 (0.0500)
BSC
0.50 (0.0197)
0.25 (0.0098)
1.75 (0.0689)
1.35 (0.0531)
×
45°
0.25 (0.0098)
0.10 (0.0039)
8°
0°
0.51 (0.0201)
0.31 (0.0122)
SEATING
PLANE
1.27 (0.0500)
0.40 (0.0157)
COPLANARITY
0.10
0.25 (0.0098)
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
7
4.50
4.40
4.30
6.40
BSC
1
PIN 1
0.65
BSC
1.05
1.00
0.80
0.20
0.09
1.20
MAX
0.75
8°
0°
0.60
0.45
0.15
0.05
0.30
0.19
SEATING
PLANE
COPLANARITY
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
Temperature Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
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
Package Option
UJ-5
UJ-5
UJ-5
UJ-5
Branding
BFA
BFA
BFA
A0X
AD8603AUJ-R2
AD8603AUJ-REEL
AD8603AUJ-REEL7
AD8603AUJZ-R21
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
UJ-5
UJ-5
A0X
A0X
RM-8
RM-8
RM-8
RM-8
R-8
R-8
R-8
R-8
R-8
A00
A00
A0G
A0G
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
R-8
R-14
R-14
R-14
R-14
R-14
R-14
RU-14
RU-14
RU-14
RU-14
1 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
©
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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