Description

The CS5374 combines two marine seismic analog measurement channels into one 7 mm x 7 mm QFN package. Each measurement channel consists of a high input impedance programmable gain differential amplifier that buffers analog signals into a high-performance, fourth-order ΔΣ modulator. The low-noise ΔΣ modulator converts the analog signal into a one-bit serial bit stream suitable for the CS5376A digital filter.

Features

● High Input Impedance Differential Amplifier

• Ultra-low input bias: < 1 pA

• Max signal amplitude: 5 Vpp differential

● Fourth Order Delta-Sigma (ΔΣ) Modulator

• Signal Bandwidth: DC to 2 kHz

• Common mode rejection: 110 dB CMRR

● Differential Analog Input, Digital ΔΣ Output

• Multiplexed inputs: INA, INB, 800Ω termination

• Selectable Gain: 1x, 2x, 4x, 8x, 16x, 32x, 64x

● Excellent Amplifier Noise Performance

• 1.5 μVpp between 0.1 Hz and 10 Hz

• 11 nV / √Hz from 200 Hz to 2 kHz

● High Modulator Dynamic Range

• 126 dB SNR @ 215 Hz BW (2 ms sampling)

• 123 dB SNR @ 430 Hz BW (1 ms sampling)

● Low Total Harmonic Distortion

• –118 dB THD typical (0.000126)

• –108 dB THD maximum (0.0004)

● Low Power Consumption

• Normal operation: 6.5 mA per channel

• Power down: 15 μA per channel max

● Dual Power Supply Configuration

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