Datasheet LTC1273, LTC1275, LTC1276 (Analog Devices)

LTC1273 LTC1275/LTC1276 12-Bit, 300ksps Sampling A/D Converters with Reference
U FEATURES DESCRIPTIO
■ Single Supply 5V or ±5V Operation The LTC®1273/LTC1275/LTC1276 are 300ksps, sam- ■ 300ksps Sample Rate pling 12-bit A/D converters that draw only 75mW from ■ 75mW (Typ) Power Dissipation single 5V or ±5V supplies. These easy-to-use devices ■ On-Chip 25ppm/°C Reference come complete with 600ns sample-and-holds, precision ■ Internal Synchronized Clock; No Clock Required references and internally trimmed clocks. Unipolar and ■ High Impedance Analog Input bipolar conversion modes provide flexibility for various ■ 70dB S/(N + D) and 77dB THD at Nyquist applications. They are built with LTBiCMOSTM switched ■ ±1/2LSB INL and ±3/4LSB DNL Max (A Grade) capacitor technology. ■ ESD Protected On All Pins These devices have 25ppm/°C (max) internal references. ■ 24-Pin Narrow PDIP and SW Packages The LTC1273 converts 0V to 5V unipolar inputs from a ■ Variety of Input Ranges: single 5V supply. The LTC1275/LTC1276 convert ±2.5V 0V to 5V (LTC1273) and ±5V respectively from ±5V supplies. Maximum DC ±2.5V (LTC1275) specifications include ±1/2LSB INL, ±3/4LSB DNL and ±5V (LTC1276) 25ppm/°C full scale drift over temperature. Outstanding
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AC performance includes 70dB S/(N + D) and 77dB THD
APPLICATIO S
at the Nyquist input frequency of 150kHz. ■ High Speed Data Acquisition ■ The internal clock is trimmed for 2.7µs maximum conver- Digital Signal Processing sion time. The clock automatically synchronizes to each ■ Multiplexed Data Acquisition Systems sample command eliminating problems with asynchro- ■ Audio and Telecom Processing ■ nous clock noise found in competitive devices. A high Spectrum Analysis speed parallel interface eases connections to FIFOs, DSPs , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. LTBiCMOS is a trademark of Linear Technology Corporation. and microprocessors. All other trademarks are the property of their respective owners.
U TYPICAL APPLICATIO Single 5V Supply, 300ksps, 12-Bit Sampling A/D Converter Effective Bits and Signal to (Noise + Distortion) vs Input Frequency
LTC1273 5V 1 24 12 74 ANALOG INPUT AIN VDD 2.42V (0V TO 5V) 2 23 + 11 68 V V REF REF NC 0.1µF + 3 22 10µF 10 62 OUTPUT NYQUIST 0.1µF AGND BUSY 10µF FREQUENCY 4 21 9 56 D11 CS µP CONTROL 5 20 8 50 S/(N + D) (dB) D10 RD LINES 6 19 7 D9 HBEN 6 7 18 D8 NC 8 17 5 D7 NC EFFECTIVE BITS 9 16 4 D6 D0/8 3 8- OR 12-BIT 10 15 D5 D1/9 PARALLEL BUS 11 14 2 D4 D2/10 12 13 1 fSAMPLE = 300kHz DGND D3/11 0 10k 100k 1M 2M INPUT FREQUENCY (Hz) LTC1273/75/76 • TA02 LTC1273/75/76 • TA01 127356fa 1