ADS1174

(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not implied.

The ADS1174 (quad) and ADS1178 (octal) are multiple delta-sigma () analog-to-digital converters (ADCs) with data rates up to 52k samples-per-second (SPS), which allow synchronous sampling of four and eight channels. These devices use identical packages, permitting drop-in expandability.

The delta-sigma architecture of ADS1174 offers near ideal 16-bit ac performance (97dB SNR, 105dB THD, 1LSB linearity) combined with 0.005dB passband ripple, and linear phase response.

The high-order, chopper- stabilized modulator achieves very low drift (4V/°C offset, 4ppm/°C gain) and low noise (1LSBPP). The on-chip finite impulse response (FIR) filter of ADS1174 provides a usable signal bandwidth up to 90% of the Nyquist rate with 100dB of stop band attenuation while suppressing modulator and signal out-of-band noise.

Two operating modes allow for optimization of speed and power of ADS1174: High-speed mode (32mW/Ch at 52kSPS), and Low-power mode (8mW/Ch at 10kSPS).

A SYNC input control pin allows the device conversions to be started and synchronized to an external event. SPI and Frame-Sync serial interfaces are supported. ADS1174 is fully specified over the extended industrial range (40°C to +105°C) and is available in an HTQFP-64 PowerPAD™ package.