ADS1284IRHFT

ADS1284 Ultra-High-Resolution Delta-Sigma ADC

Texas Instruments ADS1284 Ultra-High-Resolution Delta-Sigma Analog-to-Digital Converter (ADC) is a high-performance, single-chip, analog-to-digital converter (ADC). The device includes a low-noise programmable gain amplifier (PGA), delta-sigma (ΔΣ) modulator, and digital filter. The ADC supports two modes of operation with trade-offs between power and resolution. The two-channel multiplexer has the inputs for signal measurement and an ADC signal test. A mode is available to short circuit the inputs and test for internal noise. The PGA has a high input impedance and low noise, which provides for the direct connection of geophone and hydrophone sensors. The fourth-order, inherently stable modulator provides outstanding noise and linearity performance. The modulator output is filtered and decimated by the on-chip digital filter to yield the ADC conversion result. The digital filter provides data rates from 250 to 4000SPS. The high-pass filter (HPF) has a programmable corner frequency. On-chip gain and offset scale registers support system calibration. The synchronization input controls the timing of the ADC conversion. The power-down input puts the ADC into power-down mode.