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CS5374-CNZ Scheda tecnica(PDF) 1 Page - Cirrus Logic |
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CS5374-CNZ Scheda tecnica(HTML) 1 Page - Cirrus Logic |
1 / 44 page Copyright Cirrus Logic, Inc. 2009 (All Rights Reserved) Preliminary Product Information This document contains information for a new product. Cirrus Logic reserves the right to modify this product without notice. http://www.cirrus.com Dual High-performance Amplifier & ΔΣ Modulator 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, 800 Ω 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 Description The CS5374 combines two marine seismic analog mea- surement channels into one 7 mm x 7 mm QFN package. Each measurement channel consists of a high input impedance programmable gain differential amplifi- er 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. Each amplifier has two sets of external inputs, INA and INB, to simplify system design as inputs from a hydro- phone sensor or the CS4373A test DAC. An internal 800 Ω termination can also be selected for noise tests. Gain settings are binary weighted (1x, 2x, 4x, 8x, 16x, 32x, 64x) and match the CS4373A test DAC output at- tenuation settings for full-scale testing at all gain ranges. Both the input multiplexer and gain are set by registers accessed through a standard SPI™ port. Each fourth-order ΔΣ modulator has very high dynamic range combined with low total harmonic distortion and low power consumption. It converts differential analog signals from the amplifier to an oversampled ΔΣ serial bit stream which is decimated by the CS5376A digital filter to a 24-bit output at the final output word rate. ORDERING INFORMATION See page 43. INA1+ INB1+ MUX1 MUX2 INB1- INA1- GUARD1 + - - + INA2+ INB2+ INB2- INA2- + - - + Reset, Clock, and Synchronization INR1- VA+ MFLAG1 MCLK MSYNC MFLAG2 MDATA2 GUARD2 INR2- INR2+ 4th Order Modulator 4th Order Modulator INF1- INF1+INR1+ RST SPITM Serial Interface SDI SDO SCLK CS INF2+ INF2- OUT2- OUT2+ OUT1+ OUT1- CS5374 VA- GND VD VREF- VREF+ VA+ VA- MDATA1 OCT '09 DS862F1 CS5374 |
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