Precision Amplifiers (VOS < 1 mV, Bandwidth < 50 MHz)
Rail-to-Rail Output Amplifiers
AD8641: Low Power, Rail-to-Rail Output Precision JFET Amplifier
The AD8641/AD8642/AD8643 are low power, precision JFET input amplifiers featuring extremely low input bias current and rail-to-rail output. The ability
to swing nearly rail-to-rail at the input and rail-to-rail at the output enables designers to buffer CMOS DACs, ASICs, and other wide output swing devices
in single-supply systems. The outputs remain stable with capacitive loads of more than 500 pF.
Features
•ꢀLow supply current: 250 mA max
10000
V
= ꢀ13V
SY
•ꢀVery low input bias current: 1 pA max
•ꢀLow offset voltage: 750 mV max
•ꢀSingle-supply operation: 5 V to 26 V
•ꢀDual-supply operation: 62.5 V to 613 V
•ꢀRail-to-rail output
V
– V
OH
SY
1000
100
10
–V – V
SY
OL
•ꢀUnity-gain stable
Applications
•ꢀLine-/battery-powered instruments
•ꢀPrecision current sensing
•ꢀMedical instrumentation
•ꢀIndustrial controls
•ꢀPrecision filters
1
0.001
0.01
0.1
1
10
100
LOAD CURRENT (mA)
•ꢀPortable audio
Output saturation voltage vs. load current.
•ꢀATE
ADA4691-2 Dual, Low Power, Wideband, Low Noise, Rail-to-Rail Output Amplifier
The ADA4691-2 is a dual, rail-to-rail output, single-supply amplifier featuring low power, wide bandwidth, and low noise. The ADA4691-2 has two
independent shutdown pins, allowing further reduction in supply current. These amplifiers are ideal for a wide variety of applications. Audio preamps, filters,
IR/photodiode amplifiers, charge amps, and high impedance sensors all benefit from this combination of performance features.
Features
•ꢀLow power: 180 µA typical
1
ADA4692-2
•ꢀLow distortion: 0.003% THD + N
V
= ꢀ2.5V
SY
A
T
= –1
= 25°C
V
A
•ꢀLow noise: 16 nV/√Hz typical
•ꢀ3.6 MHz bandwidth
0.1
0.01
•ꢀOffset voltage: 500 µV typical
R
= 600ꢁ
L
Applications
•ꢀPortable audio
R
= 2kꢁ
L
•ꢀPortable instrumentation and medical devices
•ꢀPhotodiode amplifiers
•ꢀSensor amplifiers
•ꢀLow-side current sense
•ꢀADC drivers
0.001
10
100
1k
FREQUENCY (Hz)
10k 20k
•ꢀActive filters
•ꢀSample-and-hold
Noise vs. frequency.
•ꢀAutomotive sensors
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