AD8607AR-REEL [ADI]
Precision Micropower Low Noise CMOS Rail-Rail Input/Output Operational Amplifiers; 精密微功耗，低噪声CMOS轨对轨输入/输出运算放大器
| 型号： | AD8607AR-REEL |
| 厂家： | 
ADI |
| 描述： | Precision Micropower Low Noise CMOS Rail-Rail Input/Output Operational Amplifiers |
| 文件： | 总16页 (文件大小：1108K) |
| 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
5
V+
OUT
V–
1
2
3
AD8603
TOP VIEW
(Not to Scale)
4
–IN
+IN
Figure 1. 5-Lead TSOT-23 (UJ Suffix)
No phase reversal
Unity gain stable
1
8
5
OUT A
V+
–
IN A
OUT B
–IN B
APPLICATIONS
Battery-powered instrumentation
AD8607
4
+IN A
V–
+IN B
Multipole filters
Sensors
Figure 2. 8-Lead MSOP (RM Suffix)
Low power ASIC input or output amplifiers
OUT A
–IN A
1
2
3
4
8
7
6
5
V+
GENERAL DESCRIPTION
OUT B
–IN B
+IN B
AD8607
The AD8603/AD8607/AD8609 are, single/dual/quad micro-
power rail-to-rail input and output amplifiers, respectively, that
features very low offset voltage as well as low input voltage and
current noise.
+IN A
V–
Figure 3. 8-Lead SOIC (R Suffix)
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.
OUT A
OUT D
IN D
+IN D
1
14
–
–IN A
+IN A
V+
AD8609
V
–
+IN B
+IN C
IN C
OUT C
–
IN B
–
8
7
OUT B
Figure 4. 14-Lead TSSOP (RU Suffix)
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.
OUT A
IN A
1
2
3
4
5
6
7
14 OUT D
13 –IN D
12 +IN D
–
+IN A
V+
AD8609
11
10
9
V–
The AD8603 is available in a tiny 5-lead TSOT-23 package. The
AD8607 is available in 8-lead MSOP and SOIC packages. The
AD8609 is available in 14-lead TSSOP and SOIC packages.
+IN B
–IN B
OUT B
+IN C
–IN C
OUT C
8
Figure 5. 14-Lead SOIC (R Suffix)
Rev. A
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: 781.326.8703
www.analog.com
© 2003 Analog Devices, Inc. All rights reserved.
AD8603/AD8607/AD8609
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 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 .......................................................................... 16
REVISION HISTORY
10/03—Data Sheet Changed from Rev. 0 to Rev. A
Change
Page
Added AD8607 and AD8609 parts ..............................Universal
Changes to Specifications............................................................ 3
Changes to Figure 35.................................................................. 10
Added Figure 41.......................................................................... 11
Rev. A | Page 2 of 16
AD8603/AD8607/AD8609
SPECIFICATIONS
Table 1. Electrical Characteristics @ VS = 5 V, VCM = VS/2, TA = 25°C, unless otherwise noted
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. A | Page 3 of 16
AD8603/AD8607/AD8609
Table 2. Electrical Characteristics @ VS = 1.8 V, VCM = VS/2, TA = 25°C, unless otherwise noted
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. A | Page 4 of 16
AD8603/AD8607/AD8609
ABSOLUTE MAXIMUM RATINGS
Table 3. AD8603/AD8607/AD8609 Stress Ratings1, 2
Table 4. Package Characteristics
3
Parameter
Rating
Package Type
θJA
θJC
61
45
43
36
35
Unit
°C/W
°C/W
°C/W
°C/W
°C/W
Supply Voltage
Input Voltage
6 V
GND to VS
6 V
5-Lead TSOT-23 (UJ)
8-Lead MSOP (RM)
8-Lead SOIC (R)
14-Lead SOIC (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 Range (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 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 listed
in the operational sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device
reliability.
–65°C to +150°C
2 Absolute maximum ratings apply at 25°C, unless otherwise noted.
3 θJA is specified for the worst-case conditions, i.e., θJA is specified for device
soldered in circuit board for surface-mount packages.
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 these parts feature
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. A | Page 5 of 16
AD8603/AD8607/AD8609
TYPICAL PERFORMANCE CHARACTERISTICS
2600
300
250
200
150
100
50
V
= 3.3V
= 25°C
V
= 5V
S
A
S
A
2400
2200
2000
1800
1600
1400
T
T
= 25°C
= 0V to 5V
V
CM
0
1200
1000
–50
–100
–150
800
600
400
–200
–250
–300
200
0
–270 –210 –150 –90 –30
V
0
OS
30
(µV)
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
((VV))
V
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 = ±2.5V
S
T
= –40°C TO +125°C
A
V
= 0V
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
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
= 5V
S
A
V
= 5V
S
A
T
= 25°C
T
= 25°C
0
SINK
SOURCE
–50
1
0.1
–100
–150
–200
–250
–300
0.01
0.0
0.5
1.0
1.5
2.0
2.5
(V)
3.0
3.5
4.0
4.5
5.0
10
0.001
0.01
0.1
LOAD CURRENT (mA)
1
V
CM
Figure 11. Output Voltage to Supply Rail vs. Load Current
Figure 8. Input Offset Voltage vs. Common-Mode Voltage
Rev. A | Page 6 of 16
AD8603/AD8607/AD8609
350
1925
1750
1575
1400
1225
V
T
= 5V
S
= 25°C
A
V
= ±2.5V, ±0.9V
300
250
200
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
80
0
–40 –25 –10
5
20
35
50
65
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
= ±2.5V
= 100kΩ
= 20pF
S
L
L
R
C
V
S
= ±2.5V
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
1k
10k
100k
FREQUENCY (Hz)
1M
10M
100
1k
FREQUENCY (Hz)
10k
100k
Figure 13. Open-Loop Gain and Phase vs. Frequency
Figure 16. Common-Mode Rejection Ratio vs. Frequency
5.0
4.5
4.0
3.5
3.0
140
120
100
V
V
= 5V
S
V
= ±2.5V
S
= 4.9V p-p
IN
T = 25°C
A
= 1
V
80
60
40
20
2.5
2.0
1.5
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. A | Page 7 of 16
AD8603/AD8607/AD8609
60
V
= 5V
S
V
= 5V, 1.8V
S
50
40
30
OS–
20
10
0
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
L
L
V
= 200pF
= 1
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
S
R
C
A
= 10kΩ
T
= 25°C
L
L
V
A
= 200pF
= 1
80
70
60
50
40
30
20
10
0
0
1.0
2.0
3.0
4.0
5.0
TIME (20µs/DIV)
SUPPLY VOLTAGE (V)
Figure 23. Large Signal Transient
Figure 20. Supply Current vs. Supply Voltage
Rev. A | Page 8 of 16
AD8603/AD8607/AD8609
176
154
132
110
88
V
= ±2.5V
= 10kΩ
= 100
S
V
= ±2.5V
S
R
A
L
V
IN
+2.5V
V
= 50mV
0V
0V
66
44
22
–50mV
0
0
1
2
3
4
5
6
7
8
9
10
FREQUENCY (kHz)
µs/DIV))
TIME (40µs/DIV))
Figure 27. Voltage Noise Density vs. Frequency
Figure 24. Negative Overload Recovery
800
750
700
650
600
550
500
450
400
350
300
V
= ±2.5V
= 10kΩ
= 100
S
R
A
L
V
= 1.8V
= 25°C
S
A
V
IN
T
+2.5V
V
= 50mV
V
= 0V to 1.8V
CM
0V
0V
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 25. Positive Overload Recovery
Figure 28. VOS Distribution
168
144
120
96
300
250
200
150
100
50
V
= ±2.5V
S
V
= 1.8V
= 25°C
S
A
T
72
0
–50
48
–100
–150
24
–200
–250
–300
0
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
FREQUENCY (kHz)
0.0
0.3
0.6
0.9
VV ((VV))
1.2
1.5
1.8
CCMM
Figure 26. Voltage Noise Density vs. Frequency
Figure 29. Input Offset Voltage vs. Common-Mode Voltage
Rev. A | Page 9 of 16
AD8603/AD8607/AD8609
1000
100
80
225
180
V
= ±0.9V
= 100kΩ
= 20pF
S
L
L
V
= 1.8V
= 25°C
S
A
R
C
T
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
–100
–225
10
0.001
0.01
0.1
LOAD CURRENT (mA)
1
1
10
100
1M
10M
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
–10
–40 –25
5
20
35
50
65 80
95 110 125
100
1k
10k
FREQUENCY (Hz)
100k
TEMPERATURE (°C)
Figure 34. Common-Mode Rejection Ratio vs. Frequency
Figure 31. Output Voltage Swing vs. Temperature
1.8
60
50
40
30
V
= 1.8V
= 25°C
= 1
S
A
V = 1.8V
S
T
V
= 1.7V p–p
IN
1.5
1.2
A
V
T= 25°C
= 1
A
V
0.9
0.6
OS–
20
10
0
OS+
0.3
0.0
0.01
0.1
1
10
100
10
100
LOAD CAPACITANCE (pF)
1000
FREQUENCY (kHz)
Figure 35. Closed-Loop Output Voltage Swing vs. Frequency
Figure 32. Small Signal Overshoot vs. Load Capacitance
Rev. A | Page 10 of 16
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 39. Voltage Noise Density
Figure 36. Small Signal Transient
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 37. Large Signal Transient
Figure 40. Channel Separation
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. A | Page 11 of 16
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.
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
S
150Ω
C
L
INPUT OVERVOLTAGE PROTECTION
200mV
+
–
V
CC
C
S
47pF
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.
Figure 43. Snubber Network
V
V
C
R
R
C
= ±0.9V
= 100mV
= 2nF
= 10kΩ
= 150Ω
= 470pF
SY
IN
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
L
L
S
S
(VIN – VS)/(RS + 200 Ω) ≤ 5 mA
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.
Figure 44. Output Response to a 2 nF Capacitive Load, with Snubber
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.
Optimum values for RS and CS are determined empirically;
Table 5 lists a few starting values.
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.
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
Rev. A | Page 12 of 16
AD8603/AD8607/AD8609
R1
R2
PROXIMITY SENSORS
1kΩ
99kΩ
V
EE
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.
V
CC
V+
U5
V
–
AD8603
AD8541
V+
V–
V
V
CC
IN
V
EE
R4
R3
1kΩ
99kΩ
Figure 45. High Gain Composite Amplifier
R2
100kΩ
COMPOSITE AMPLIFIERS
V
EE
AD8603
V
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.
V
CC
R1
R3
–
1kΩ
V+
R4
V+
1kΩ
V
IN
V
–
100Ω
AD8541
C2
V
CC
V
C3
EE
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.
Figure 46. Low Power Composite Amplifier
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.
Rev. A | Page 13 of 16
AD8603/AD8607/AD8609
BATTERY-POWERED APPLICATIONS
network at the output to reduce the noise. The signal bandwidth
can be calculated by ½πR2C2 and the closed-loop bandwidth is
the intersection point of the open-loop gain and the noise gain.
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.
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.
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
electronics. The TSOT package allows the AD8603 to be used
on smaller board spaces.
C2 10pF
R2 1000MΩ
V
CC
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.
AD8603
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
V
EE
Figure 47. Photodiode Circuit
Rev. A | Page 14 of 16
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)
0.40 (0.0157)
COPLANARITY
0.10
0.25 (0.0098)
0.17 (0.0067)
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS MS-012AA
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) [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
8°
4°
0.10 MAX
0.60
0.45
0.30
0.50
0.30
SEATING
PLANE
0.20
0.08
COMPLIANT TO JEDEC STANDARDS MO-193AB
Figure 49. 5-Lead Thin Small Outline Transistor Package [TSOT]
(UJ-5)
Dimensions in millimeters
3.00
BSC
8
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
SEATING
PLANE
0.10
COMPLIANT TO JEDEC STANDARDS MO-187AA
Figure 50. 8-Lead MSOP Package (RM-8)
Dimensions in millimeters
Rev. A | Page 15 of 16
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
1.27 (0.0500)
0.40 (0.0157)
COPLANARITY
0.10
0.25 (0.0098)
0.17 (0.0067)
PLANE
COMPLIANT TO JEDEC STANDARDS MS-012AB
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) [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
0.75
0.60
0.45
MAX
8°
0°
0.15
0.05
0.30
0.19
SEATING
PLANE
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-153AB-1
Figure 52. 14-Lead Thin Shrink Small Outline Package (TSSOP) [RU-14]
Dimensions shown in millimeters
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
Package Description
5-Lead TSOT-23
5-Lead TSOT-23
5-Lead TSOT-23
8-Lead MSOP
8-Lead MSOP
8-Lead SOIC
Package Option
UJ-5
UJ-5
Branding
BFA
BFA
BFA
A00
AD8603AUJ-R2
AD8603AUJ-REEL
AD8603AUJ-REEL7
AD8607ARM-R2
AD8607ARM-REEL
AD8607AR
AD8607AR-REEL
AD8607AR-REEL7
AD8609AR
UJ-5
RM-8
RM-8
R-8
R-8
R-8
R-14
R-14
R-14
RU-14
RU-14
A00
8-Lead SOIC
8-Lead SOIC
14-Lead SOIC
14-Lead SOIC
14-Lead SOIC
14-Lead TSSOP
14-Lead TSSOP
AD8609AR-REEL
AD8609AR-REEL7
AD8609ARU
AR8609ARU-REEL
©
2003 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
C04356–0–10/03(A)
Rev. A | Page 16 of 16
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