Datasheet LTC1279 (Analog Devices)

LTC1279 12-Bit, 600ksps Sampling A/D Converter with Shutdown
U FEATU S RE DESCRIPTIO
■
Single Supply 5V or
±
5V Operation
The LTC®1279 is a 1.4µs, 600ksps, sampling 12-bit A/D ■
Sample Rate: 600ksps
converter which draws only 60mW from a single 5V or ■
70dB S/(N + D) and 74dB THD at Nyquist
±5V supplies. This easy-to-use device comes complete ■
Power Dissipation: 60mW Typ
with a 160ns sample-and-hold, a precision reference and ■ Power Shutdown with Instant Wake-Up an internally trimmed clock. Unipolar and bipolar conver- ■ Internal Reference Can Be Overdriven Externally sion modes add to the flexibility of the ADC. The low ■ Internal Synchronized Clock; No Clock Required power dissipation is reduced even more, drawing only ■ High Impedance Analog Input 8.5mW in power shutdown mode. Instant wake-up from ■ Input Range: 0V to 5V or ±2.5V power shutdown allows the converter to be powered ■ New Flexible, Friendly Parallel Interface Eases down even during brief inactive periods. Connections to DSPs and FIFOs The LTC1279 converts 0V to 5V unipolar inputs from a ■ 24-Pin SO Wide Package single 5V supply and ±2.5V bipolar inputs from ±5V
O U
supplies. Maximum DC specs include ±1LSB INL and
APPLICATI S
±1LSB DNL. Outstanding guaranteed AC performance includes 70dB S/(N + D) and 78dB THD at the input ■ High Speed Data Acquisition frequency of 100kHz over temperature. ■ Digital Signal Processing ■ Multiplexed Data Acquisition Systems The internal clock is trimmed for 1.4µs conversion time. ■ Audio and Telecom Processing The clock automatically synchronizes to each sample ■ Spectrum Analysis command, eliminating problems with asynchronous clock noise found in competitive devices. A separate conversion start input and a data-ready signal (BUSY) ease connec- tions to FIFOs, DSPs and microprocessors. , LTC and LT are registered trademarks of Linear Technology Corporation.
O U TYPICAL APPLICATI Single 5V Supply, 600kHz, 12-Bit Sampling A/D Converter Effective Bits and Signal-to-(Noise + Distortion) vs Input Frequency
LTC1279 5V 12 74 1 24 ANALOG INPUT AIN AVDD 2.42V (0V TO 5V) 11 68 2 23 + SIGNAL/(NOISE + DISTORTION) (dB) REFERENCE VREF VSS + 10µF 0.1µF 10 62 3 22 NYQUIST OUTPUT AGND BUSY 0.1µF 10µF 9 FREQUENCY 56 4 21 D11(MSB) CS µP CONTROL 8 50 5 20 LINES D10 RD 7 6 19 D9 CONVST CONVERSION-START INPUT 6 7 18 D8 SHDN POWER SHUTDOWN INPUT 5 8 17 D7 DVDD 4 9 16 12-BIT D6 D0 PARALLEL 3 10 15 EFFECTIVE NUMBER OF BITS D5 D1 BUS 2 11 14 D4 D2 1 12 13 fSAMPLE = 600kHz DGND D3 0 10k 100k 1M 5M FREQUENCY (Hz) LTC1279 • TA01 1279 G03 1