ADS7812

ADS7812 ADS7812 ADS7812 SBAS042A – MARCH 1997 – REVISED SEPTEMBER 2003 Low-Power, Serial 12-Bit Sampling ANALOG-TO-DIGITAL CONVERTER FEATURES q 20µs max CONVERSION TIME q SINGLE +5V SUPPLY OPERATION q PIN-COMPATIBLE WITH 16-BIT ADS7813 q EASY-TO-USE SERIAL INTERFACE q 0.3" DIP-16 AND SO-16 q ±0.5LSB max INL AND DNL q 72dB min SINAD q USES INTERNAL OR EXTERNAL REFERENCE q MULTIPLE INPUT RANGES q 35mW max POWER DISSIPATION q NO MISSING CODES q 50µW POWER DOWN MODE APPLICATIONS q DATA ACQUISITION SYSTEMS q INDUSTRIAL CONTROL q TEST EQUIPMENT q DIGITAL SIGNAL PROCESSING R1IN R2IN R3IN BUF CAP REF 40kΩ(1) 8kΩ(1) 20kΩ(1) DESCRIPTION The ADS7812 is a low-power, single +5V supply, 12-bit sampling analog-to-digital converter. It contains a complete 12-bit capacitor-based SAR A/D with a sample/hold, clock, reference, and serial data interface. The converter can be configured for a variety of input ranges including ±10V, ±5V, 0V to 10V, and 0.5V to 4.5V. A high impedance 0.3V to 2.8V input range is also available (input impedance > 10MΩ). For most input ranges, the input voltage can swing to +16.5V or –16.5V without damage to the converter. A flexible SPI compatible serial interface allows data to be synchronized to an internal or external clock. The ADS7812 is specified at a 40kHz sampling rate over the –40°C to +85°C temperature range. It is available in a 0.3" DIP-16 or an SO-16 package. BUSY PWRD CONV CS Successive Approximation Register and Control Logic Clock CDAC B...