CS3301A
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 outputs for CS5371A / 72A / 73A
Max signal amplitude: 5 V
pp
differential
Low input bias: 1 nA typical
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
CLK
VD
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
Low Total Harmonic Distortion
• -121 dB THD typical (0.0000891%)
• -112 dB THD maximum (0.0002512%)
Low Power Consumption
• Normal operation: 5.5 mA typical
• Power down: 10
µA
typical
Small 24-pin SSOP Package
Bipolar Power Supply Configuration
• VA+ = +2.5 V; VA- = -2.5 V; VD = +3.3 V
VA+
INA+
INB+
400
Ω
+
-
OUTR+
OUTF+
MUX0
MUX1
400
Ω
GAIN0
GAIN1
GAIN2
-
+
INA-
INB-
VA-
OUTF-
OUTR-
PWDN
GND
Copyright
©
Cirrus Logic, Inc. 2007
(All Rights Reserved)
MAR ‘07
DS757F1
CIRRUS [ CIRRUS LOGIC ]
