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Data Sheet
Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifiers ADA4841-1/ADA4841-2
FEATURES
Low power: 1.1 mA/amp Low wideband noise
2.1 nV/√Hz 1.4 pA/√Hz Low 1/f noise 7 nV/√Hz @ 10 Hz 13 pA/√Hz @ 10 Hz Low distortion: −105 dBc @ 100 kHz, VO = 2 V p-p High speed 80 MHz, −3 dB bandwidth (G = +1) 12 V/µs slew rate 175 ns settling time to 0.1% Low offset voltage: 0.3 mV maximum Rail-to-rail output Power down Wide supply range: 2.7 V to 12 V
APPLICATIONS
Low power, low noise signal processing Battery-powered instrumentation 16-bit PulSAR® ADC drivers
GENERAL DESCRIPTION
The ADA4841-1/ADA4841-2 are unity gain stable, low noise and distortion, rail-to-rail output amplifiers that have a quiescent current of 1.5 mA maximum. In spite of their low power consumption, these amplifiers offer low wideband voltage noise performance of 2.1 nV/√Hz and 1.4 pA/√Hz current noise, along with excellent spurious-free dynamic range (SFDR) of −105 dBc at 100 kHz. To maintain a low noise environment at lower frequencies, the amplifiers have low 1/f noise of 7 nV/√Hz and 13 pA/√Hz at 10 Hz.
The ADA4841-1/ADA4841-2 output can swing to less than 50 mV of either rail. The input common-mode voltage range extends down to the negative supply. The ADA4841-1/ ADA4841-2 can drive up to 10 pF of capacitive load with minimal peaking.
The ADA4841-1/ADA4841-2 provide the performance required to efficiently support emerging 16-bit to 18-bit ADCs and are ideal for portable instrumentation, high channel count, industrial measurement, and medical applications. The ADA4841-1/ ADA4841-2 are ideally suited to drive the AD7685/AD7686,
Rev. G
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CONNECTION DIAGRAMS
ADA4841-1
TOP VIEW NC 1 (Not to Scale) 8 POWER DOWN
–IN 2
7 +VS
+IN 3
6 VOUT
–VS 4
5 NC
05614-001
Figure 1. 8-Lead SOIC (R)
ADA4841-1
VOUT 1
6 +VS
–VS 2
5 POWER DOWN
05614-099
+IN 3
4 –IN
Figure 2. 6-Lead SOT-23 (RJ)
ADA4841-2
OUT1 1 –IN1 2 +IN1 3 –VS 4
8 +VS 7 OUT2 6 –IN2 5 +IN2
05614-064
TOP VIEW (Not to Scale)
NOTES 1. FOR 8-LEAD LFCSP_WD, CONNECT
EXPOSED PADDLE TO GND.
Figure 3. 8-Lead MSOP (RM), 8-Lead SOIC_N (R), and 8-Lead LFCSP_WD (CP)
16-bit PulSAR ADCs.
The ADA4841-1/ADA4841-2 packages feature RoHS compliant lead finishes. The amplifiers are rated to work over the industrial temperature range (−40°C to +125°C).
–30
VS = ±5V –40 G = +1
HARMONIC DISTORTION (dBc)
–50
–60
–70 2V p-p THIRD
–80
–90 –100
2V p-p SECOND
05614-048
–110
–120 0.01
0.1 FREQUENCY (MHz)
Figure 4. Harmonic Distortion
1
One.
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