ADS7820

® ADS 782 0 ADS7820 782 0 ADS 12-Bit 10µs Sampling CMOS ANALOG-to-DIGITAL CONVERTER FEATURES q 100kHz min SAMPLING RATE q 0 to +5V INPUT RANGE q 72dB min SINAD WITH 45kHz INPUT q ±1/2 LSB max INL AND DNL q SINGLE +5V SUPPLY OPERATION q PIN-COMPATIBLE WITH 16-BIT ADS7821 q USES INTERNAL OR EXTERNAL REFERENCE q COMPLETE WITH S/H, REF, CLOCK, ETC. q FULL PARALLEL DATA OUTPUT q 100mW max POWER DISSIPATION q 28-PIN 0.3" PLASTIC DIP AND SOIC DESCRIPTION The ADS7820 is a complete 12-bit sampling A/D using state-of-the-art CMOS structures. It contains a complete 12-bit, capacitor-based SAR A/D with S/H, reference, clock, interface for microprocessor use, and three-state output drivers. The ADS7820 is specified at a 100kHz sampling rate, and guaranteed over the full temperature range. Lasertrimmed scaling resistors provide a 0 to +5V input range, with power dissipation under 100mW. The 28-pin ADS7820 is available in a plastic 0.3" DIP and in an SOIC, both fully specified for operation over the industrial –40°C to +85°C range. Clock Successive Approximation Register and Control Logic R/C CS BYTE BUSY CDAC 5kΩ 0 to +5V Input 6.66kΩ 20kΩ Comparator CAP Buffer 4kΩ REF Internal +2.5V Ref Output Latches and Three State Drivers Three State Parallel Data Bus International Airport Industrial Park Mailing Address: PO Box 11400 Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd. Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111 Cable: BBRCORP Telex: 066-6491 FA...