Analog Devices AD8632, AD8631 Datasheet
1.8 V, 5 MHz Rail-to-Rail
1
2
3
5
4
–IN A+IN A
V+
OUT A
AD8631
V–
OUT A
–IN A
+IN A
V–
V+
OUT B
–IN B
+IN B
AD8632
18
27
36
45
–IN A
+IN A
V–
OUT B
–IN B
+IN B
V+
1
4
5
8
AD8632
OUT A
a
Low Power Operational Amplifiers
FEATURES
Single Supply Operation: 1.8 V to 6 V
Space-Saving SOT-23, SOIC Packaging
Wide Bandwidth: 5 MHz @ 5 V, 4 MHz @ 1.8 V
Low Offset Voltage: 4 mV Max, 0.8 mV typ
Rail-to-Rail Input and Output Swing
2 V/s Slew Rate @ 1.8 V
Only 225 A Supply Current @ 1.8 V
APPLICATIONS
Portable Communications
Portable Phones
Sensor Interface
Active Filters
PCMCIA Cards
ASIC Input Drivers
Wearable Computers
Battery-Powered Devices
New Generation Phones
Personal Digital Assistants
GENERAL DESCRIPTION
The AD8631 brings precision and bandwidth to the SOT-23-5
package at single supply voltages as low as 1.8 V and low supply
current. The small package makes it possible to place the AD8631
next to sensors, reducing external noise pickup.
The AD8631 and AD8632 are rail-to-rail input and output bipolar
amplifiers with a gain bandwidth of 4 MHz and typical voltage
offset of 0.8 mV from a 1.8 V supply. The low supply current and
the low supply voltage makes these parts ideal for battery-powered
applications. The 3 V/µs slew rate makes the AD8631/AD8632 a
good match for driving ASIC inputs, such as voice codecs.
The AD8631/AD8632 is specified over the extended industrial
(–40ⴗC to +125ⴗC) temperature range. The AD8631 single is
available in 5-lead SOT-23 surface-mount packages. The dual
AD8632 is available in 8-lead SOIC and µSOIC packages.
AD8631/AD8632
PIN CONFIGURATIONS
5-Lead SOT-23
(RT Suffix)
8-Lead SOIC
(R Suffix)
8-Lead SOIC
(RM Suffix)
REV. 0
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reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 2000
AD8631/AD8632–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
(VS = 5 V, V– = 0 V, VCM = 2.5 V, TA = 25ⴗC unless otherwise noted)
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage V
OS
–40ⴗC ≤ T
Input Bias Current I
B
–40ⴗC ≤ T
Input Offset Current I
OS
–40ⴗC ≤ T
Input Voltage Range V
CM
Common-Mode Rejection Ratio CMRR 0 V ≤ V
–40ⴗC ≤ T
Large Signal Voltage Gain A
Offset Voltage Drift ∆V
VO
/∆T 3.5 µV/ⴗC
OS
RL = 10 kΩ, 0.5 V < V
= 100 kΩ, 0.5 V < V
R
L
R
= 100 kΩ, –40ⴗC ≤ TA ≤ +125ⴗC 100 V/mV
L
≤ +125ⴗC6mV
A
≤ +125ⴗC 500 nA
A
≤ +125ⴗC 550 nA
A
05V
≤ 5 V, 63 70 dB
CM
≤ +125ⴗC56 dB
A
< 4.5 V 25 V/mV
OUT
< 4.5 V 100 400 V/mV
OUT
0.8 4.0 mV
250 nA
±150 nA
Bias Current Drift ∆IB/∆T 400 pA/ⴗC
OUTPUT CHARACTERISTICS
Output Voltage Swing High V
Output Voltage Swing Low V
Short Circuit Current I
OH
OL
SC
IL = 100 µA
–40ⴗC ≤ T
I
= 1 mA 4.7 V
L
≤ +125ⴗC 4.965 V
A
IL = 100 µA
–40ⴗC ≤ T
I
= 1 mA 200 mV
L
≤ +125ⴗC35mV
A
Short to Ground, Instantaneous ±10 mA
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = 2.2 V to 6 V, 75 90 dB
Supply Current/Amplifier I
SY
–40ⴗC ≤ T
V
OUT
≤ +125ⴗC72 dB
A
= 2.5 V 300 450 µA
–40ⴗC ≤ TA ≤ +125ⴗC 650 µA
DYNAMIC PERFORMANCE
Slew Rate SR 1 V < V
< 4 V, RL = 10 kΩ 3V/µs
OUT
Gain Bandwidth Product GBP 5 MHz
Settling Time T
Phase Margin φ
S
m
0.1% 860 ns
53 Degrees
NOISE PERFORMANCE
Voltage Noise en p-p 0.1 Hz to 10 Hz 0.8 µV p-p
Voltage Noise Density e
Current Noise Density i
Specifications subject to change without notice.
n
n
f = 1 kHz 23 nV/√Hz
f = 1 kHz 1.7 pA/√Hz
–2–
REV. 0
AD8631/AD8632
ELECTRICAL CHARACTERISTICS
(VS = 2.2 V, V– = 0 V, VCM = 1.1 V, TA = 25ⴗC unless otherwise noted)
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage V
OS
–40ⴗC ≤ T
Input Bias Current I
Input Offset Current I
Input Voltage Range V
B
OS
CM
Common-Mode Rejection Ratio CMRR 0 V ≤ V
–40ⴗC ≤ T
Large Signal Voltage Gain A
VO
RL = 10 kΩ, 0.5 V < V
≤ +125ⴗC6mV
A
0 2.2 V
≤ 2.2 V, 54 70 dB
CM
≤ +125ⴗC47 dB
A
< 1.7 V 25 V/mV
OUT
0.8 4.0 mV
250 nA
±150 nA
RL = 100 kΩ 50 200 V/mV
OUTPUT CHARACTERISTICS
Output Voltage Swing High V
Output Voltage Swing Low V
OH
OL
IL = 100 µA 2.165 V
I
= 750 µA 1.9 V
L
IL = 100 µA35mV
IL = 750 µA 200 mV
POWER SUPPLY
Supply Current/Amplifier I
SY
V
= 1.1 V 250 350 µA
OUT
–40ⴗC ≤ TA ≤ +125ⴗC 500 µA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 10 kΩ 2.5 V/µs
Gain Bandwidth Product GBP 4.3 MHz
Phase Margin φ
m
50 Degrees
NOISE PERFORMANCE
Voltage Noise Density e
Current Noise Density i
Specifications subject to change without notice.
n
n
f = 1 kHz 23 nV/√Hz
f = 1 kHz 1.7 pA/√Hz
–3–REV. 0
AD8631/AD8632–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
(VS = 1.8 V, V– = 0 V, VCM = 0.9 V, TA = 25ⴗC unless otherwise noted)
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage V
OS
0ⴗC ≤ T
Input Bias Current I
Input Offset Current I
Input Voltage Range V
B
OS
CM
Common-Mode Rejection Ratio CMRR 0 V ≤ V
0ⴗC ≤ T
Large Signal Voltage Gain A
VO
RL = 10 kΩ, 0.5 V < V
RL = 100 kΩ, 0.5 V < V
≤ 125ⴗC6mV
A
0 1.8 V
≤ 1.8 V,
CM
≤ 125ⴗC4965dB
A
< 1.3 V 20 V/mV
OUT
< 1.3 V 40 200 V/mV
OUT
0.8 4.0 mV
250 nA
±150 nA
OUTPUT CHARACTERISTICS
Output Voltage Swing High V
Output Voltage Swing Low V
OH
OL
IL = 100 µA 1.765 V
I
= 750 µA 1.5 V
L
IL = 100 µA35mV
IL = 750 µA 200 mV
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = 1.7 V to 2.2 V, 68 86 dB
Supply Current/Amplifier I
SY
0ⴗC ≤ T
V
≤ 125ⴗC65 dB
A
= 0.9 V 225 325 µA
OUT
0ⴗC ≤ TA ≤ 125ⴗC 450 µA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 10 kΩ 2V/µs
Gain Bandwidth Product GBP 4 MHz
Phase Margin φ
m
49 Degrees
NOISE PERFORMANCE
Voltage Noise Density e
Current Noise Density i
Specifications subject to change without notice.
n
n
f = 1 kHz 23 nV/√Hz
f = 1 kHz 1.7 pA/√Hz
–4–
REV. 0
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