CS3302
High-Z, Programmable Gain, Differential Amplifier
Features
& Description
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
Ultra-low input bias: < 1 pA
Description
The CS3302 is a high-input-impedance, differential in-
put, differential output amplifier with programmable gain,
optimized for amplifying signals from high-impedance
sensors such as hydrophones. The gain settings are bi-
nary 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 800Ω termina-
tion can also be selected for noise tests.
Amplifier input impedance is very high, requiring less
than 1 pA of input current. Noise performance is very
good at 1
µ
V
p-p
between 0.1 Hz and 10 Hz, and a noise
density of 8.5 nV/
√Hz
over the 200 Hz to 2 kHz band-
width. Distortion performance is also extremely good,
typically -118 dB THD. Low input current, low noise, and
low total harmonic distortion make this amplifier ideal for
high-impedance differential sensors requiring maximum
dynamic range.
ORDERING INFORMATION
See
Excellent Noise Performance
• 1
µV
p-p
between 0.1 Hz and 10 Hz
• 8.5 nV/
√Hz
from 200 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 mA, 3.3 mA, 10
µA
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
VA+
INA+
INB+
400
Ω
GUARD
VD
640
500
Ω
+
-
OUTR+
OUTF+
500
Ω
640
MUX0
MUX1
400
Ω
GAIN0
GAIN1
GAIN2
500
Ω
640
-
+
640
500
Ω
INA-
INB-
VA-
OUTF-
OUTR-
LPWR
PWDN
DGND
Copyright
©
Cirrus Logic, Inc. 2007
(All Rights Reserved)
DEC ‘07
DS596F3
CIRRUS [ CIRRUS LOGIC ]
