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LTC1278-4CSW

製品説明
仕様・特性

LTC1278 12-Bit, 500ksps Sampling A/D Converter with Shutdown U DESCRIPTIO FEATURES s s s s s s s s s s s s Single Supply 5V or ±5V Operation Two Speed Grades,500ksps (LTC1278-5) 400ksps (LTC1278-4) 70dB S/(N + D) and 74dB THD at Nyquist No Missing Codes Over Temperature 75mW (Typ) Power Dissipation Power Shutdown with Instant Wake-Up Internal Reference Can Be Overdriven Externally Internal Synchronized Clock; No Clock Required High Impedance Analog Input 0V to 5V or ±2.5V Input Range New Flexible, Friendly Parallel Interface to DSPs and FIFOs 24-Pin Narrow PDIP and SW Packages The LTC®1278 is a 1.6µs, 500ksps, sampling 12-bit A/D converter that draws only 75mW from a single 5V or ±5V supplies. This easy-to-use device comes complete with a 200ns sample-and-hold, a precision reference and an internally trimmed clock. Unipolar and bipolar conversion modes add to the flexibility of the ADC. The low power dissipation is made even more attractive by a 8.5mW power-down feature. Instant wake-up from shutdown allows the converter to be powered down even during brief inactive periods. The LTC1278 converts 0V to 5V unipolar inputs from a single 5V supply and ±2.5V bipolar inputs from ±5V supplies. Maximum DC specs include ±1LSB INL and ±1LSB DNL. Outstanding guaranteed AC performance includes 70dB S/(N + D) and 78dB THD at the input frequency of 100kHz over temperature. UO APPLICATI s s s s s S High Speed Data Acquisition Digital Signal Processing Multiplexed Data Acquisition Systems Audio and Telecom Processing Spectrum Analysis The internal clock is trimmed for 1.6µs conversion time. The clock automatically synchronizes to each sample command, eliminating problems with asynchronous clock noise found in competitive devices. A separate convert start input and a data ready signal (BUSY) ease connections to FIFOs, DSPs and microprocessors. , LTC and LT are registered trademarks of Linear Technology Corporation. UO TYPICAL APPLICATI Single 5V Supply, 500kHz, 12-Bit Sampling A/D Converter LTC1278-5 + 10µF 24 + 23 22 21 20 19 18 17 10µF 12 µP CONTROL LINES CONVERSION START INPUT POWER DOWN INPUT 16 15 14 74 11 0.1µF 68 10 62 NYQUIST FREQUENCY 9 56 8 S/(N+D) (dB) ANALOG INPUT 1 A AVDD (0V TO 5V) 2 IN VREF VSS 3 AGND BUSY 0.1µF 4 D11(MSB) CS 5 D10 RD 6 D9 CONVST 7 D8 SHDN 8 D7 DVDD 9 D6 D0 10 12-BIT D5 D1 PARALLEL 11 D4 D2 BUS 12 DGND D3 EFFECTIVE NUMBER OF BITS 2.42V REFERENCE OUTPUT Effective Bits and Signal-to-(Noise + Distortion) vs Input Frequency 5V 7 6 5 4 3 2 13 1 0 10k LTC1278 • TA01 fSAMPLE = 500kHz 100k INPUT FREQUENCY (Hz) 1M 2M LT1278 G4 1

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LINEARTECHNOLOGY

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