Description

The CS3302A is a high input-impedance, differential input, differential output amplifier with programmable gain, optimized for amplifying signals from high-impedance sensors such as hydrophones. 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 800Ω termination 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 µVp-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.

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 CS5371A / 72A / 73A

   • Max signal amplitude: 5 Vpp differential

   • Ultra-low input bias: < 1 pA

● Excellent Noise Performance

   • 1 µVp-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 operation: 5 mA

   • Power down: 10 µA

● Dual Power Supply Configuration

   • VA+ = +2.5 V; VA- = -2.5 V;VD = +3.3 V