CS3301
Low-noise, Programmable Gain, Differential Amplifier
Features
& Desription
Signal Bandwidth:
DC to 2 kHz
Selectable Gain:
x1, x2, x4, x8, x16, x32, x64
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
Description
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.
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
Low Total Harmonic Distortion
• -118 dB THD typical (0.000126%)
• -112 dB THD maximum (0.000251%)
Low Power Consumption
• Normal/LPWR/PWDN: 5.5 mA, 3.5 mA, 10
µA
Single or Dual Power Supply Configurations
• VA+ = +5 V; VA- = 0 V; VD = +3.3 V to +5 V
ORDERING INFORMATION
• VA+ = +2.5 V;VA- = -2.5 V;VD = +3.3 V
See
VA+
INA+
INB+
400
Ω
CLK
VD
680
Ω
500
+
-
OUTR+
OUTF+
500
680
Ω
MUX0
MUX1
400
Ω
GAIN0
GAIN1
GAIN2
680
Ω
500
-
+
INA-
INB-
VA-
OUTF-
OUTR-
680
Ω
500
LPWR
PWDN
DGND
Copyright
©
Cirrus Logic, Inc. 2007
(All Rights Reserved)
DEC ‘07
DS595F3
CIRRUS [ CIRRUS LOGIC ]
