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LTC1272-3CCS Datasheet(PDF) 1 Page - Linear Technology |
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LTC1272-3CCS Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page 1 LTC1272 12-Bit, 3 µs, 250kHz Sampling A/D Converter DESCRIPTIO s AD7572 Pinout s 12-Bit Resolution s 3 µs and 8µs Conversion Times s On-Chip Sample-and-Hold s Up to 250kHz Sample Rates s 5V Single Supply Operation s No Negative Supply Required s On-Chip 25ppm/ °C Reference s 75mW (Typ) Power Consumption s 24-Pin Narrow DIP and SOL Packages s ESD Protected on All Pins S FEATURE s High Speed Data Acquisition s Digital Signal Processing (DSP) s Multiplexed Data Acquisition Systems s Single Supply Systems S APPLICATI The LTC1272 is a 3 µs, 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 opera- tion. It uses LTBiCMOS TM switched-capacitor technology to combine a high speed 12-bit ADC with a fast, accurate sample-and-hold and a precision reference. 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 opera- tion, 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 1 µs sample- and-hold acquisition time is allowed between conversions. 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 3 µs and 8µs. FREQUENCY (kHz) 0 –140 20 40 60 80 LTC1272 • TA02 –120 –100 –80 –60 –40 –20 0 100 120 S (N+D) = 72.1 Single 5V Supply, 3 µs, 12-Bit Sampling ADC 10 F µ IN REF D11 (MSB) D10 D9 D8 D7 CLK IN CLK OUT HBEN RD CS BUSY NC V LTC1272 D6 D5 D4 DGND D3/11 D2/10 D1/9 D0/8 A V AGND DD P CONTROL LINES µ µ 0.1 F 5V 8 OR 12-BIT PARALLEL BUS ANALOG INPUT (0V TO 5V) 10 µF 0.1 µF LTC1272 • TA01 + + 2.42V V OUTPUT REF APPLICATI TYPICAL LTBiCMOS is a trademark of Linear Technology Corporation 1024 Point FFT, fS = 250kHz, fIN = 10kHz |
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