CS3301_07 Datasheet, PDF (1/16 Pages) Cirrus Logic – Low-noise, Programmable Gain, Differential Amplifier

CS3301
Low-noise, Programmable Gain, Differential Amplifier
Features & Desription
Description
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 charge outputs for CS5371/72
• Max signal amplitude: 5 V_pp differential
• Low input bias: 500 pA
z Outstanding Noise Performance
• 0.20 µV_p-p between 0.1 Hz and 10 Hz
• 8.5 nV/ Hz from 0.1 Hz to 2 kHz
z Low Total Harmonic Distortion
• -118 dB THD typical (0.000126%)
• -112 dB THD maximum (0.000251%)
z Low Power Consumption
• Normal/LPWR/PWDN: 5.5 mA, 3.5 mA, 10 µA
z Single or Dual Power Supply Configurations
• VA+ = +5 V; VA- = 0 V; VD = +3.3 V to +5 V
• VA+ = +2.5 V;VA- = -2.5 V;VD = +3.3 V
The CS3301 is a low-noise differential input, differential
output amplifier with programmable gain, optimized for
amplifying signals from low-impedance sensors such as
geophones. The gain settings are binary weighted (x1,
x2, x4, x8, x16, x32, x64) and are selected using simple
pin settings. 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 band-
width. Distortion performance is also extremely good,
typically -118 dB THD. Flat noise down to 0.1 Hz and
low total harmonic distortion make this amplifier ideal for
low-frequency, low-amplitude, differential signals requir-
ing maximum dynamic range.
ORDERING INFORMATION
See page 15.
INA+
INB+
VA+
MUX0
MUX1
INA-
INB-
VA-
CLK
VD
+
658000 Ω
OUTR+
-
OUTF+
65800 Ω
GAIN0
GAIN1
GAIN2
65800 Ω
-
OUTF-
OUTR-
+
65800 Ω
LPWR PWDN DGND
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2007
(All Rights Reserved)
DEC ‘07
DS595F3