CS3301A Datasheet, PDF (1/16 Pages) Cirrus Logic – Low-noise, Programmable Gain, Differential Amplifier

CS3301A
Low-noise, Programmable Gain, Differential Amplifier
Features & Desription
z Signal Bandwidth: DC to 2 kHz
z Selectable Gain: x1, x2, x4, x8, x16, x32, x64
z Differential Inputs, Differential Outputs
• Multiplexed inputs: INA, INB, 800Ω termination
• Rough / fine outputs for CS5371A / 72A / 73A
• Max signal amplitude: 5 V_pp differential
• Low input bias: 1 nA typical
z Outstanding Noise Performance
• 8.5 nV/ Hz from 0.1 Hz to 2 kHz
• 0.180 µV_p-p between 0.1 Hz and 10 Hz
z Low Total Harmonic Distortion
• -121 dB THD typical (0.0000891%)
• -112 dB THD maximum (0.0002512%)
z Low Power Consumption
• Normal operation: 5.5 mA typical
• Power down: 10 µA typical
z Small 24-pin SSOP Package
z Bipolar Power Supply Configuration
• VA+ = +2.5 V; VA- = -2.5 V; VD = +3.3 V
Description
The CS3301A is a low-noise differential input, dif-
ferential output amplifier with programmable gain,
optimized for amplifying signals from low-imped-
ance sensors such as geophones. The gain
settings are binary weighted (x1, x2, x4, x8, x16,
x32, x64) and are selected using simple pin set-
tings. Two sets of external inputs, INA and INB,
simplify system design as inputs from a sensor and
test DAC. An internal 800 Ω termination can also be
selected for noise tests.
Amplifier noise performance is outstanding with a
noise density of 8.5 nV/ Hz over the 0.1 Hz to
2 kHz bandwidth. Distortion performance is also ex-
tremely good, typically -121 dB THD at x1 gain. Flat
noise down to 0.1 Hz and low total harmonic distor-
tion make this amplifier ideal for low-frequency,
low-amplitude, differential signals requiring maxi-
mum dynamic range.
ORDERING INFORMATION
See page 15.
VA+
CLK
VD
INA+
INB+
+
OUTR+
-
OUTF+
MUX0
MUX1
GAIN0
GAIN1
GAIN2
INA-
INB-
VA-
-
+
PWDN GND
OUTF-
OUTR-
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Copyright © Cirrus Logic, Inc. 2007
(All Rights Reserved)
MAR ‘07
DS757F1