PDF ADS7824UB Data sheet ( Hoja de datos )

Número de pieza	ADS7824UB
Descripción	4 Channel/ 12-Bit Sampling CMOS A/D Converter
Fabricantes	Burr-Brown Corporation
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No Preview Available ! ® ADS7824 ADS7824 ADS7824 www.burr-brown.com/databook/ADS7824.html 4 Channel, 12-Bit Sampling CMOS A/D Converter FEATURES q 25µs max SAMPLING AND CONVERSION q SINGLE +5V SUPPLY OPERATION q PIN-COMPATIBLE WITH 16-BIT ADS7825 q PARALLEL AND SERIAL DATA OUTPUT q 28-PIN 0.3" PLASTIC DIP AND SOIC q ±0.5 LSB max INL AND DNL q 50mW max POWER DISSIPATION q 50µW POWER DOWN MODE q ±10V INPUT RANGE, FOUR CHANNEL MULTIPLEXER q CONTINUOUS CONVERSION MODE DESCRIPTION The ADS7824 can acquire and convert 12 bits to within ±0.5 LSB in 25µs max while consuming only 50mW max. Laser-trimmed scaling resistors provide the standard industrial ±10V input range and channel- to-channel matching of ±0.1%. The ADS7824 is a low-power 12-bit sampling A/D with a four channel input multiplexer, S/H, clock, reference, and a parallel/serial microprocessor interface. It can be con- figured in a continuous conversion mode to sequen- tially digitize all four channels. The 28-pin ADS7824 is available in a plastic 0.3" DIP and in a SOIC, both fully specified for operation over the industrial –40°C to +85°C range. AIN0 AIN1 AIN2 AIN3 40kΩ 20kΩ 40kΩ 20kΩ 40kΩ 20kΩ 40kΩ 20kΩ Continuous Conversion Channel CONTC A0 A1 R/C Clock 8kΩ Successive Approximation Register and Control Logic CS PWRD CDAC 8kΩ 8kΩ 8kΩ CAP REF Buffer 6kΩ Internal +2.5V Ref Comparator Serial Data Out or Parallel Data Out 8 BUSY DATACLK SDATA D7-D0 BYTE 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 ©1996 Burr-Brown Corporation PDS-11303B APriDnteSd in7U8.S2.A4. October, 1997 ® 1 page TYPICAL PERFORMANCE CURVES At TA = +25°C, fS = 40kHz, VS1 = VS2 = +5V, using internal reference, unless otherwise noted. 0 –10.0 –20.0 –30.0 –40.0 –50.0 –60.0 –70.0 –80.0 –90.0 –100.0 –110.0 0 FREQUENCY SPECTRUM (8192 Point FFT; fIN = 1.02kHz, –0.5dB) 5 10 15 Frequency (kHz) 20 ADJACENT CHANNEL CROSSTALK, WORST PAIR (8192 Point FFT; AIN3 = 1.02kHz, –0.1dB; AIN2 = AGND) 0 –10.0 –20.0 –30.0 –40.0 –50.0 –60.0 –70.0 –80.0 –90.0 –100.0 –110.0 0 5 10 15 Frequency (kHz) 20 ADJACENT CHANNEL CROSSTALK, WORST PAIR (8192 Point FFT; AIN3 = 10.1kHz, –0.1dB; AIN2 = AGND) 0 –10.0 –20.0 –30.0 –40.0 –50.0 –60.0 –70.0 –80.0 –90.0 –100.0 –110.0 0 5 10 15 Frequency (kHz) 20 POWER SUPPLY RIPPLE SENSITIVITY INL/DNL DEGRADATION PER LSB OF P-P RIPPLE 1 10–1 10–2 10–3 INL 10–4 10–5 101 DNL 102 103 104 105 106 Power Supply Ripple Frequency (Hz) 107 0.3 0.2 All Codes INL 0.1 0 –0.1 –0.2 –0.3 0 512 1024 1536 2048 2560 Decimal Code 3072 3584 4095 0.3 0.2 All Codes DNL 0.1 0 –0.1 –0.2 –0.3 0 512 1024 1536 2048 2560 Decimal Code 3072 3584 4095 2 BPZ Error 1 0 –1 –2 0.2 +FS Error 0 –0.2 0.2 –FS Error 0 –0.2 –50 –25 ENDPOINT ERRORS 0 25 50 Temperature (°C) 75 100 ® 5 ADS7824 5 Page ® 11 ADS7824 11 Page

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