ADS8638

ADS8634 ADS8638 www.ti.com SBAS541A – MAY 2011 – REVISED AUGUST 2011 12-Bit, 1MSPS, 4-/8-Channel, Bipolar-Input, SAR Analog-to-Digital Converter with Software-Selectable Ranges Check for Samples: ADS8634, ADS8638 FEATURES 1 23 Selectable Input Range: ±10V, ±5V, ±2.5V, 0V to 10V, or 0V to 5V Up to ±12V with External Reference No Latent Conversions Up to 1MSPS Outstanding Performance: 12 Bits No Missing Codes INL: ±0.9LSB SNR: 71.8dB Highly Integrated: 4- or 8-Channel Input Mux Temperature Sensor Internal Voltage Reference Alarm Thresholds for Each Channel Low Power: 14.45mW at 1MSPS 5.85mW at 0.1MSPS Flexible Power-Down Mode SPI™-Compatible Serial Interface Extended Temperature Range: –40°C to +125°C Small Footprint: 4mm × 4mm QFN Package DESCRIPTION The ADS8634 and ADS8638 (ADS8634/8) are 12-bit analog-to-digital converters (ADCs) capable of measuring inputs up to ±10V at 1MSPS. Using a successive approximation register (SAR) core, these ADCs provide a sample-and-hold front-end with no latency in conversions. The ADS8634 includes an input multiplexer (mux) for measuring up to four inputs. The ADS8638 can measure up to eight inputs. In addition to the input multiplexer, the ADS8634/8 feature an internal temperature sensor, voltage reference, and a digital comparator for setting alarm thresholds on each input; therefore, a minimal amount of external components are required. A simple SPI-compatible interface provides for communication and control. The digit...