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LTC1282ACSW Datasheet(PDF) 1 Page - Linear Technology |
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LTC1282ACSW Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LTC1282 S FEATURE DESCRIPTIO The LTC ®1282 is a 6 µs, 140ksps, sampling 12-bit A/D converter that draws only 12mW from a single 3V or dual ±3Vsupply.Thiseasy-to-usedevicecomescompletewith 1.14 µs sample-and-hold, precision reference and inter- nally trimmed clock. Unipolar and bipolar conversion modes provide flexibility for various applications. They are built with LTBiCMOS TM switched capacitor technology. The LTC1282 has a 25ppm/ °C (max) internal reference and converts 0V to 2.5V unipolar inputs from a single 3V supply. With ±3V supplies its input range is ±1.25V with two’s complement output format. Maximum DC specifica- tions include ±0.5LSB INL, ±0.75LSB DNL and 25ppm/°C full-scale drift over temperature. Outstanding AC perfor- mance includes 69dB S/(N + D) and 77dB THD at the Nyquist input frequency of 70kHz. The internal clock is trimmed for 6 µs maximum conver- sion time. The clock automatically synchronizes to each sample command eliminating problems with asynchro- nous clock noise found in competitive devices. A high speed parallel interface eases connections to FIFOs, DSPs and microprocessors. 3V 140ksps 12-Bit Sampling A/D Converter with Reference s Single Supply 3V or ±3V Operation s 140ksps Throughput Rate s 12mW (Typ) Power Dissipation s On-Chip 25ppm/ °C Reference s Internal Synchronized Clock; No Clock Required s High Impedance Analog Input s 69dB S/(N + D) and 77dB THD at Nyquist s ±0.5LSB INL and ±0.75LSB DNL Max (A Grade) s 2.7V Guaranteed Minimum Supply Voltage s ESD Protected On All Pins s 24-Pin Narrow PDIP and SW Packages s 0V to 2.5V or ±1.25V Input Ranges S APPLICATI s 3V Powered Systems s High Speed Data Acquisition s Digital Signal Processing s Multiplexed Data Acquisition Systems s Audio and Telecom Processing s Spectrum Analysis INPUT FREQUENCY (Hz) 1k 0 3 5 7 10 10k LTC1282 • TA02 1 4 6 9 12 11 8 2 100k 62 56 74 68 50 fSAMPLE = 140kHz NYQUIST FREQUENCY Effective Bits and Signal-to-(Noise + Distortion) vs Input Frequency , LTC and LT are registered trademarks of Linear Technology Corporation. LTBiCMOS is a trademark of Linear Technology Corporation 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 AIN VREF AGND D11(MSB) D10 D9 D8 D7 D6 D5 D4 DGND VDD VSS BUSY CS RD HBEN NC NC D0/8 D1/9 D2/10 D3/11 LTC1282 + 0.1 µF 10 µF 1.20V VREF OUTPUT ANALOG INPUT (0V TO 2.5V) + 10 µF 0.1 µF 3V 8- OR 12-BIT PARALLEL BUS µP CONTROL LINES 1282 TA01 Single 3V Supply, 140ksps, 12-Bit Sampling A/D Converter APPLICATI TYPICAL |
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