LTC1272
12-Bit, 3µs, 250kHz
Sampling A/D Converter
FEATURES DESCRIPTION n n n n n 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 LTBiCMOS™ 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
n On-Chip 25ppm/°C Reference
n 75mW (Typ) Power Consumptio ESD Protected on All Pins
n 24-Pin Narrow DIP and SOL Packages 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 …