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LTC1272-3CCSW

製品説明
仕様・特性

LTC1272 12-Bit, 3µs, 250kHz Sampling A/D Converter U FEATURES DESCRIPTIO ■ The LTC1272 is a 3µs, 12-bit, successive approximation sampling A/D converter. It has the same pinout as the industry standard AD7572 and offers faster conversion time, on-chip sample-and-hold, and single supply operation. It uses LTBiCMOSTM switched-capacitor technology to combine a high speed 12-bit ADC with a fast, accurate sample-and-hold and a precision reference. ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ AD7572 Pinout 12-Bit Resolution 3µs and 8µs Conversion Times On-Chip Sample-and-Hold Up to 250kHz Sample Rates 5V Single Supply Operation No Negative Supply Required On-Chip 25ppm/°C Reference 75mW (Typ) Power Consumption 24-Pin Narrow DIP and SOL Packages ESD Protected on All Pins The LTC1272 operates with a single 5V supply but can also accept the 5V/–15V supplies required by the AD7572 (Pin 23, the negative supply pin of the AD7572, is not connected on the LTC1272). The LTC1272 has the same 0V to 5V input range as the AD7572 but, to achieve single supply operation, it provides a 2.42V reference output instead of the – 5.25V of the AD7572. It plugs in for the AD7572 if the reference capacitor polarity is reversed and a 1µs sampleand-hold acquisition time is allowed between conversions. U APPLICATIO S ■ ■ ■ ■ High Speed Data Acquisition Digital Signal Processing (DSP) Multiplexed Data Acquisition Systems Single Supply Systems The output data can be read as a 12-bit word or as two 8-bit bytes. This allows easy interface to both 8-bit and higher processors. The LTC1272 can be used with a crystal or an external clock and comes in speed grades of 3ms and 8ms. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. LTBiCMOS is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. U TYPICAL APPLICATIO Single 5V Supply, 3µs, 12-Bit Sampling ADC 10µF VDD VREF + 0.1µF 0 A IN NC AGND + –20 CS D10 RD D9 HBEN D8 D0/8 D5 D1/9 D4 D2/10 DGND µP CONTROL LINES D3/11 –60 –80 CLK IN D6 –40 CLK OUT D7 S = 72.1 (N+D) 0.1µ F BUSY D11 (MSB) 8 OR 12-BIT PARALLEL BUS 10 µ F AMPLITUDE (dB) 2.42V VREF OUTPUT ANALOG INPUT (0V TO 5V) 1024 Point FFT, fS = 250kHz, fIN = 10kHz 5V LTC1272 –100 –120 –140 0 20 40 60 80 100 120 FREQUENCY (kHz) LTC1272 • TA02 LTC1272 • TA01 1272fb 1

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LINEARTECHNOLOGY

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