PDF ADS7808 Data sheet ( Hoja de datos )

Número de pieza	ADS7808
Descripción	12-Bit 10ms Serial CMOS Sampling ANALOG-to-DIGITAL CONVERTER
Fabricantes	Burr-Brown Corporation
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No Preview Available ! ® ADS7808 ADS7808 ADS7808 12-Bit 10µs Serial CMOS Sampling ANALOG-to-DIGITAL CONVERTER FEATURES q 100kHz SAMPLING RATE q 72dB SINAD WITH 45kHz INPUT q ±1/2 LSB INL AND DNL q SIX SPECIFIED INPUT RANGES q SERIAL OUTPUT q SINGLE +5V SUPPLY OPERATION q PIN-COMPATIBLE WITH 16-BIT ADS7809 q USES INTERNAL OR EXTERNAL REFERENCE q 100mW MAX POWER DISSIPATION q 20-PIN 0.3" PLASTIC DIP AND SOIC q SIMPLE DSP INTERFACE DESCRIPTION The ADS7808 is a complete 12-bit sampling analog- to-digital using state-of-the-art CMOS structures. It contains a 12-bit capacitor-based SAR A/D with S/H, reference, clock, and a serial data interface. Data can be output using the internal clock, or can be synchro- nized to an external data clock. The ADS7808 also provides an output synchronization pulse for ease of use with standard DSP processors. The ADS7808 is specified at a 100kHz sampling rate, and guaranteed over the full temperature range. Laser- trimmed scaling resistors provide various input ranges including ±10V and 0V to 5V, while an innovative design operates from a single +5V supply, with power dissipation under 100mW. The 20-pin ADS7808 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. R1IN R2IN R3IN CAP 20kΩ 10kΩ 20kΩ 5kΩ REF R/C CS Power Down Successive Approximation Register and Control Logic CDAC Buffer 4kΩ Internal +2.5V Ref Comparator Clock Serial Data Out BUSY Data Clock Serial Data 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 Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 ©1992 Burr-Brown Corporation PDS-11155B APDrinSted7in8U0.S8.A. January 1997 ® 1 page SYMBOL DESCRIPTION MIN TYP MAX UNITS t1 Convert Pulse Width 40 4500 ns t2 BUSY Delay 65 ns t3 BUSY LOW 8 µs t4 BUSY Delay after End of Conversion 220 ns t5 t6 t7 t6 + t7 t8 t9 t10 Aperture Delay Conversion Time Acquisition Time Throughput Time R/C LOW to DATACLK Delay DATACLK Period Data Valid to DATACLK HIGH Delay 40 5.7 8 2 9 10 450 440 20 75 ns µs µs µs ns ns ns t11 Data Valid after 100 125 ns DATACLK LOW Delay t12 External DATACLK Period 100 ns t13 External DATACLK HIGH 20 ns t14 External DATACLK LOW 30 ns t15 DATACLK HIGH 20 t12 + 5 ns Setup Time t16 R/C to CS 10 Setup Time ns t17 SYNC Delay After 15 35 ns DATACLK HIGH t18 Data Valid Delay 25 t19 CS to Rising Edge Delay 25 t20 Data Available after CS LOW 4.5 55 ns ns µs TABLE II. Conversion and Data Timing TA = –40°C to +85°C. CS, R/C t1 BUSY t2 MODE Acquire t5 t3 Convert t6 FIGURE 1. Basic Conversion Timing. R/C DATACLK SDATA BUSY t2 t8 t9 123 t11 t10 MSB Valid Bit 10 Valid Bit 9 Valid t3 11 12 Bit 1 Valid LSB Valid FIGURE 2. Serial Data Timing Using Internal Clock. (CS, EXT/INT and TAG Tied LOW.) t4 Acquire t7 ® 5 ADS7808 5 Page

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