AD8607_15 [ADI]
Precision Micropower, Low Noise CMOS;
| 型号： | AD8607_15 |
| 厂家： | 
ADI |
| 描述： | Precision Micropower, Low Noise CMOS |
| 文件： | 总16页 (文件大小：448K) |
| 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 maximum
Low input bias current: 1 pA maximum
Single-supply operation: 1.8 V to 5 V
Low noise: 22 nV/√Hz
OUT
V–
1
5
V+
AD8603
TOP VIEW
2
(Not to Scale)
+IN
3
4
–IN
Micropower: 50 μA maximum
Low distortion
Figure 1. 5-Lead TSOT (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
(Not to Scale)
APPLICATIONS
Battery-powered instrumentation
Multipole filters
Figure 2. 8-Lead MSOP (RM Suffix)
Sensors
OUT A
–IN A
+IN A
V–
1
2
3
4
8
7
6
5
V+
Low power ASIC input or output amplifiers
AD8607
OUT B
–IN B
+IN B
TOP VIEW
(Not to Scale)
GENERAL DESCRIPTION
Figure 3. 8-Lead SOIC (R Suffix)
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.
1
2
3
4
5
6
7
OUT A
–IN A
+IN A
V+
14
13
12
11
OUT D
–IN D
+IN D
V–
AD8609
TOP VIEW
(Not to Scale)
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
makes the AD8603/AD8607/AD8609 especially useful in portable
and loop-powered instrumentation.
+IN B
–IN B
OUT B
10 +IN C
9
8
–IN C
OUT C
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
+IN A
V+
1
2
3
4
5
6
7
14 OUT D
13 –IN D
12 +IN D
11 V–
AD8609
TOP VIEW
(Not to Scale)
+IN B
–IN B
OUT B
10 +IN C
The AD8603 is available in a tiny 5-lead TSOT 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.
9
8
–IN C
OUT C
Figure 5. 14-Lead SOIC (R Suffix)
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 registeredtrademarks arethe 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 ©2003–2008 Analog Devices, Inc. All rights reserved.
AD8603/AD8607/AD8609
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications..................................................................................... 1±
No Phase Reversal...................................................................... 1±
Input Overvoltage Protection................................................... 1±
Driving Capacitive Loads.......................................................... 1±
Proximity Sensors....................................................................... 13
Composite Amplifiers................................................................ 13
Battery-Powered Applications.................................................. 13
Photodiodes ................................................................................ 13
Outline Dimensions....................................................................... 14
Ordering Guide .......................................................................... 16
Applications....................................................................................... 1
General Description......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... ±
Specifications..................................................................................... 3
Electrical Characteristics............................................................. 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Typical Performance Characteristics ............................................. 6
REVISION HISTORY
6/08—Rev. B to Rev. C
Changes to Table 1............................................................................ 3
Changes to Table ±............................................................................ 4
Changes to Figure 15........................................................................ 7
Changes to Figure 33...................................................................... 10
Changes to Figure 45 and Figure 47............................................. 13
Updated Outline Dimensions....................................................... 14
Changes to Ordering Guide .......................................................... 16
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. C | Page 2 of 16
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
Short-Circuit Current
Closed-Loop Output Impedance
POWER SUPPLY
ISC
ZOUT
70
36
f = 10 kHz, AV = 1
Power Supply Rejection Ratio
Supply Current per 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. C | Page 3 of 16
AD8603/AD8607/AD8609
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
Short-Circuit Current
Closed-Loop Output Impedance
POWER SUPPLY
ISC
ZOUT
10
36
f = 10 kHz, AV = 1
Power Supply Rejection Ratio
Supply Current per 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
0.05
−115
−110
3.5
μV
nV/√Hz
nV/√Hz
pA/√Hz
dB
Current Noise Density
Channel Separation
in
CS
f = 10 kHz
f = 100 kHz
dB
Rev. C | Page 4 of 16
AD8603/AD8607/AD8609
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings apply at ±5°C, unless otherwise noted.
Table 4. Package Characteristics
1
Package Type
θJA
θJC
61
45
43
36
35
Unit
°C/W
°C/W
°C/W
°C/W
°C/W
Table 3.
5-Lead TSOT (UJ)
8-Lead MSOP (RM)
8-Lead SOIC_N (R)
14-Lead SOIC_N (R)
14-Lead TSSOP (RU)
207
210
158
120
180
Parameter
Rating
Supply Voltage
6 V
Input Voltage
GND to VS
6 V
Indefinite
−65°C to +150°C
300°C
Differential Input Voltage
Output Short-Circuit Duration to GND
Storage Temperature Range
Lead Temperature (Soldering, 60 sec)
Operating Temperature Range
Junction Temperature Range
1 θJA is specified for the worst-case conditions, that is, θJA is specified for a
device soldered in a circuit board for surface-mount packages.
−40°C to +125°C
−65°C to +150°C
ESD CAUTION
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.
Rev. C | Page 5 of 16
AD8603/AD8607/AD8609
TYPICAL PERFORMANCE CHARACTERISTICS
300
250
200
150
100
50
2600
V
T
= 3.3V
= 25°C
S
A
V
T
= 5V
= 25°C
= 0V TO 5V
S
A
2400
2200
2000
1800
1600
1400
V
CM
0
1200
1000
–50
–100
–150
800
600
400
–200
–250
–300
200
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))
–270 –210 –150 –90 –30
V
0
30 90
150 210 270
V
(µV)
CM
OS
Figure 9. Input Offset Voltage vs. Common-Mode Voltage
Figure 6. Input Offset Voltage Distribution
400
30
25
20
15
10
5
V
= ±2.5V
= –40°C TO +125°C
S
T
A
350
300
V
= 0V
CM
V
= ±2.5V
S
250
200
150
100
50
0
0
0
25
50
75
100
125
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 (µV/°C)
TEMPERATURE (°C)
Figure 10. Input Bias Current vs. Temperature
Figure 7. Input Offset Voltage Drift Distribution
1000
100
300
250
200
150
100
50
V
T
= 5V
= 25°C
S
A
V
T
= 5V
= 25°C
S
A
10
0
SOURCE
SINK
–50
1
0.1
–100
–150
–200
–250
–300
0.01
0.001
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. C | Page 6 of 16
AD8603/AD8607/AD8609
350
300
1750
1575
1400
1225
1050
875
V
T
= 5V
= 25°C
V
= ±2.5V, ±0.9V
S
S
A
V
– V @ 10mA LOAD
OH
DD
250
200
A
= 100
V
A
= 10
V
V
@ 10mA LOAD
OL
A
= 1
V
150
100
50
700
525
350
175
0
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
100k
TEMPERATURE (°C)
FREQUENCY (Hz)
Figure 12. Output Voltage Swing vs. Temperature
Figure 15. Output Impedance vs. Frequency
100
80
225
180
140
120
100
80
V
= ±2.5V
V
R
C
= ±2.5V
= 100kΩ
= 20pF
S
S
L
L
60
40
20
135
90
Φ = 70.9°
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. CMRR vs. Frequency
5.0
4.5
4.0
3.5
3.0
140
120
100
V
= ±2.5V
S
V
V
= 5V
S
= 4.9V p-p
= 25°C
= 1
IN
T
A
A
V
80
60
40
20
2.5
2.0
1.5
0
–20
1.0
0.5
0
–40
–60
0.01
0.1
1
10
100
10
100
1k
10k
100k
FREQUENCY (kHz)
FREQUENCY (Hz)
Figure 17. PSRR vs. Frequency
Figure 14. Closed-Loop Output Voltage Swing vs. Frequency
Rev. C | Page 7 of 16
AD8603/AD8607/AD8609
60
V
= 5V
V = 5V, 1.8V
S
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
V
= 5V
V
= ±2.5V
S
S
55
50
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
T
= 25°C
A
V
= 5V
S
R
C
A
= 10kΩ
= 200pF
= 1
L
L
V
80
70
60
50
40
30
20
10
0
0
1
2
3
4
5
TIME (20µs/DIV)
SUPPLY VOLTAGE (V)
Figure 20. Supply Current vs. Supply Voltage
Figure 23. Large Signal Transient
Rev. C | Page 8 of 16
AD8603/AD8607/AD8609
176
154
132
110
88
V
R
A
= ±2.5V
= 10kΩ
= 100
V
= ±2.5V
S
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
μ
s/DIV))
TIME (40µs/DIV)
FREQUENCY (kHz)
Figure 24. Negative Overload Recovery
Figure 27. Voltage Noise Density vs. Frequency
800
750
700
650
600
550
V
R
A
= ±2.5V
= 10kΩ
= 100
V
= 1.8V
= 25°C
S
S
T
L
A
V
= 0V TO 1.8V
V
CM
+2.5V
V
= 50mV
IN
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 25. Positive Overload Recovery
Figure 28. VOS Distribution
300
250
200
150
100
50
168
V
= ±2.5V
V
T
= 1.8V
= 25°C
S
S
A
144
120
96
72
48
24
0
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 29. Input Offset Voltage vs. Common-Mode Voltage
Figure 26. Voltage Noise Density vs. Frequency
Rev. C | Page 9 of 16
AD8603/AD8607/AD8609
1000
100
80
225
180
V
R
C
= ±0.9V
= 100kΩ
= 20pF
V
T
= 1.8V
= 25°C
S
S
L
L
A
60
40
20
135
90
100
10
Φ = 70°
45
SOURCE
0
–20
–40
–60
–80
0
SINK
–45
–90
–135
–180
–225
1
0.1
0.01
0.001
–100
1k
10k
100k
1M
10M
10
0.01
0.1
LOAD CURRENT (mA)
1
FREQUENCY (Hz)
Figure 33. Open-Loop Gain and Phase vs. Frequency
Figure 30. Output Voltage to Supply Rail vs. Load Current
140
120
100
V
= 1.8V
S
90
80
70
60
50
40
V
= 1.8V
S
100
80
V
– V @ 1mA LOAD
OH
DD
60
40
20
V
@ 1mA LOAD
OL
0
30
20
10
0
–20
–40
–60
100
1k
10k
FREQUENCY (Hz)
100k
–10
–40 –25
5
20
35
50
65 80
95 110 125
TEMPERATURE (°C)
Figure 31. Output Voltage Swing vs. Temperature
Figure 34. CMRR vs. Frequency
60
50
40
30
20
10
0
1.8
1.5
1.2
0.9
0.6
V
= 1.8V
= 25°C
= 1
S
T
A
V
V
= 1.8V
S
A
V
= 1.7V p-p
= 25°C
= 1
IN
T
A
A
V
OS–
0.3
0
OS+
10
100
LOAD CAPACITANCE (pF)
1000
0.01
0.1
1
10
100
FREQUENCY (kHz)
Figure 32. Small Signal Overshoot vs. Load Capacitance
Figure 35. Closed-Loop Output Voltage Swing vs. Frequency
Rev. C | Page 10 of 16
AD8603/AD8607/AD8609
176
154
132
110
88
V
= 1.8V
= 10kΩ
= 200pF
= 1
V
= ±0.9V
S
S
R
C
A
L
L
V
66
44
22
0
0
1
2
3
4
5
6
7
8
9
10
TIME (4µs/DIV)
FREQUENCY (kHz)
Figure 39. Voltage Noise Density vs. Frequency
Figure 36. Small Signal Transient
0
V
= ±2.5V, ±0.9V
S
V
= 1.8V
S
–20
R
C
A
= 10kΩ
= 200pF
= 1
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 vs. Frequency
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 vs. Frequency
Rev. C | Page 11 of 16
AD8603/AD8607/AD8609
APPLICATIONS
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.
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.
V
V
C
= ±0.9V
= 100mV
= 2nF
S
IN
L
L
R
= 10kΩ
V
V
A
R
= ±2.5V
= 6V p-p
= 1
S
IN
V
IN
V
L
= 10kΩ
V
OUT
Figure 42. Output Response to a 2 nF Capacitive Load, Without Snubber
V
EE
V–
V+
TIME (4µs/DIV)
R
S
150Ω
C
L
Figure 41. No Phase Response
+
–
200mV
C
S
V
CC
47pF
INPUT OVERVOLTAGE PROTECTION
Figure 43. Snubber Network
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.
V
= ±0.9V
= 100mV
= 2nF
= 10kΩ
= 150Ω
= 470pF
SY
IN
V
C
R
R
C
L
L
S
S
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 following equation:
(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.
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 ±0% 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 ± nF with no ringing and less than 3%
overshoot.
Table 5. Optimum Values for the Snubber Network
CL (pF)
RS (Ω)
CS (pF)
100 to ~500
1500
500
100
680
330
1600 to ~2000
400
100
Rev. C | Page 12 of 16
AD8603/AD8607/AD8609
PROXIMITY SENSORS
BATTERY-POWERED APPLICATIONS
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 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.
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.
PHOTODIODES
COMPOSITE AMPLIFIERS
Photodiodes have a wide range of applications from barcode
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.
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± (see Figure 45) improves the phase margin.
Picking CF = 50 pF yields a phase margin of about 45° for the
values shown in Figure 45.
Figure 47 shows a simple photodiode circuit. The feedback
capacitor helps the circuit maintain stability. The signal band-
width 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.
C
F
R1
R2
1kΩ
99kΩ
V
EE
V
CC
V+
U5
AD8603
V–
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.
AD8541
V+
V
–
V
V
CC
IN
V
EE
R3
R4
1kΩ
99kΩ
C2
10pF
Figure 45. High Gain Composite Amplifier
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 band-
width is increased substantially, and the input offset voltage and
noise of the AD8541 become insignificant because they are divided
by the high gain of the AD8603.
R2
1000MΩ
V
EE
V–
AD8603
The circuit in Figure 46 offers high bandwidth (nearly double
that of the AD8603), high output current, and very low power
consumption of less than 100 μA.
C1
10pF
R1
1000MΩ
V+
V
CC
R2
Figure 47. Photodiode Circuit
V
100kΩ
EE
R1
V–
V
CC
1kΩ
R3
AD8603
R4
V+
1kΩ
V
IN
V
–
100Ω
AD8541
C2
V+
V
EE
C3
V
CC
Figure 46. Low Power Composite Amplifier
Rev. C | Page 13 of 16
AD8603/AD8607/AD8609
OUTLINE DIMENSIONS
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 48. 5-Lead Thin Small Outline Transistor Package [TSOT]
(UJ-5)
Dimensions shown in millimeters
3.20
3.00
2.80
8
1
5
4
5.15
4.90
4.65
3.20
3.00
2.80
PIN 1
0.65 BSC
0.95
0.85
0.75
1.10 MAX
0.80
0.60
0.40
8°
0°
0.15
0.00
0.38
0.22
0.23
0.08
SEATING
PLANE
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-187-AA
Figure 49. 8-Lead Mini Small Outline Package [MSOP]
(RM-8)
Dimensions shown in millimeters
Rev. C | Page 14 of 16
AD8603/AD8607/AD8609
5.00 (0.1968)
4.80 (0.1890)
8
1
5
4
6.20 (0.2441)
5.80 (0.2284)
4.00 (0.1574)
3.80 (0.1497)
0.50 (0.0196)
0.25 (0.0099)
1.27 (0.0500)
BSC
45°
1.75 (0.0688)
1.35 (0.0532)
0.25 (0.0098)
0.10 (0.0040)
8°
0°
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
1.27 (0.0500)
0.40 (0.0157)
0.25 (0.0098)
0.17 (0.0067)
SEATING
PLANE
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 50. 8-Lead Standard Small Outline Package [SOIC_N]
(R-8)
Dimensions shown in millimeters and (inches)
8.75 (0.3445)
8.55 (0.3366)
8
7
14
1
6.20 (0.2441)
5.80 (0.2283)
4.00 (0.1575)
3.80 (0.1496)
1.27 (0.0500)
0.50 (0.0197)
0.25 (0.0098)
45°
BSC
1.75 (0.0689)
1.35 (0.0531)
0.25 (0.0098)
0.10 (0.0039)
8°
0°
COPLANARITY
0.10
SEATING
PLANE
1.27 (0.0500)
0.40 (0.0157)
0.51 (0.0201)
0.31 (0.0122)
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
0.60
0.45
8°
0°
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. C | Page 15 of 16
AD8603/AD8607/AD8609
ORDERING GUIDE
Model
Temperature Range
Package Description
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
5-Lead TSOT
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
AD8609ARU-REEL
AD8609ARUZ1
AD8609ARUZ-REEL1
−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
5-Lead TSOT
5-Lead TSOT
UJ-5
UJ-5
A0X
A0X
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
RM-8
RM-8
RM-8
RM-8
R-8
R-8
R-8
R-8
R-8
A00
A00
A0G
A0G
R-8
R-14
R-14
R-14
R-14
R-14
R-14
RU-14
RU-14
RU-14
RU-14
1 Z = RoHS Compliant Part.
©2003–2008 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D04356-0-6/08(C)
Rev. C | Page 16 of 16
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