CS3302_07 Datasheet, PDF (1/16 Pages) Cirrus Logic – High-Z, Programmable Gain, Differential Amplifier

CS3302
High-Z, Programmable Gain, Differential Amplifier
Features & 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
• Ultra-low input bias: < 1 pA
z Excellent Noise Performance
• 1 µV_p-p between 0.1 Hz and 10 Hz
• 8.5 nV/ √Hz from 200 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 mA, 3.3 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
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 µV_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 page 15.
INA+
INB+
VA+
MUX0
MUX1
INA-
INB-
VA-
GUARD
VD
+
56040 Ω
OUTR+
-
OUTF+
56040 Ω
GAIN0
GAIN1
GAIN2
560400 Ω
-
OUTF-
OUTR-
+
56040 Ω
LPWR PWDN DGND
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2007
(All Rights Reserved)
DEC ‘07
DS596F3