Amplifiers (Bandwidth < 50 MHz)
Low Cost Amplifiers
AD8541: General-Purpose CMOS Rail-to-Rail Amplifier
The AD8541/AD8542/AD8544 are single, dual, and quad rail-to-rail input and output single-supply amplifiers featuring very low supply current and 1 MHz
bandwidth. All are guaranteed to operate from a 2.7 V single supply, as well as a 5 V supply. These parts provide 1 MHz bandwidth at a low current
consumption of 45 mA per amplifier.
Features
•ꢀSingle-supply operation: 2.7 V to 5.5 V
C
100pF
•ꢀLow supply current: 45 mA/amplifier
•ꢀWide bandwidth: 1 MHz
R
10M
•ꢀNo phase reversal
ꢀ
•ꢀLow input currents: 4 pA
•ꢀUnity-gain stable
V+
OR
7
2
3
6
VOUT
•ꢀRail-to-rail Input/Output
AD8541
4
D
Applications
•ꢀSensor interfaces
2.5V
2.5V
REF
REF
•ꢀPiezoelectric transducer amplifiers
•ꢀMedical instrumentation
•ꢀMobile communications
•ꢀAudio outputs
High input impedance application—photodiode amplifier.
•ꢀPortable systems
ADA4692-2: Dual, Low Power, Wideband, Low Noise, Rail-to-Rail Output Amplifier
The ADA4692-2 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
–80
ADA4692-2
•ꢀLow distortion: 0.003% THD + N
V
V
= ꢀ2.5V
= 2.8V p-p
= +1
SY
IN
–90
–100
–110
–120
–130
–140
•ꢀLow noise: 16 nV/√Hz typical
•ꢀ3.6 MHz bandwidth
A
V
A
T
= 25°C
•ꢀOffset voltage: 500 µV typical
Applications
•ꢀPortable audio
•ꢀPortable instrumentation and medical devices
•ꢀPhotodiode amplifiers
•ꢀSensor amplifiers
•ꢀLow-side current sense
•ꢀADC drivers
100
1k
10k
FREQUENCY (Hz)
100k
•ꢀActive filters
•ꢀSample-and-hold
Channel separation vs. frequency.
•ꢀAutomotive sensors
Operational Amplifier Selection Guide
34
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