Datasheet LTC1282 (Analog Devices)

LTC1282 3V 140ksps 12-Bit Sampling A/D Converter with Reference
U FEATU S RE DESCRIPTIO
■
Single Supply 3V or
±
3V Operation
The LTC®1282 is a 6µs, 140ksps, sampling 12-bit A/D ■
140ksps Throughput Rate
converter that draws only 12mW from a single 3V or dual ■
12mW (Typ) Power Dissipation
±3V supply. This easy-to-use device comes complete with ■ On-Chip 25ppm/°C Reference 1.14µs sample-and-hold, precision reference and inter- ■ Internal Synchronized Clock; No Clock Required nally trimmed clock. Unipolar and bipolar conversion ■ High Impedance Analog Input modes provide flexibility for various applications. They are ■ 69dB S/(N + D) and 77dB THD at Nyquist built with LTBiCMOSTM switched capacitor technology. ■ ±0.5LSB INL and ±0.75LSB DNL Max (A Grade) The LTC1282 has a 25ppm/°C (max) internal reference ■ 2.7V Guaranteed Minimum Supply Voltage and converts 0V to 2.5V unipolar inputs from a single 3V ■ ESD Protected On All Pins supply. With ±3V supplies its input range is ±1.25V with ■ 24-Pin Narrow PDIP and SW Packages two’s complement output format. Maximum DC specifica- ■ 0V to 2.5V or ±1.25V Input Ranges tions include ±0.5LSB INL, ±0.75LSB DNL and 25ppm/°C
O U
full-scale drift over temperature. Outstanding AC perfor-
APPLICATI S
mance includes 69dB S/(N + D) and 77dB THD at the ■ Nyquist input frequency of 70kHz. 3V Powered Systems ■ High Speed Data Acquisition The internal clock is trimmed for 6µs 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 , LTC and LT are registered trademarks of Linear Technology Corporation. and microprocessors. LTBiCMOS is a trademark of Linear Technology Corporation
O U TYPICAL APPLICATI Single 3V Supply, 140ksps, 12-Bit Sampling A/D Converter Effective Bits and Signal-to-(Noise + Distortion) vs Input Frequency
LTC1282 3V 12 74 1 24 ANALOG INPUT AIN VDD 11 68 1.20V (0V TO 2.5V) 2 23 + V V REF REF VSS 10µF 0.1µF 10 62 + 3 22 OUTPUT NYQUIST 0.1µF AGND BUSY 9 56 10µF 4 21 FREQUENCY D11(MSB) CS µP CONTROL 8 50 S/(N + D) (dB) 5 20 D10 RD LINES 7 6 19 D9 HBEN 6 7 18 D8 NC 5 8 17 D7 NC 4 9 16 D6 D0/8 3 8- OR 12-BIT 10 15 D5 D1/9 2 PARALLEL BUS 11 14 D4 D2/10 ENOBs (EFFECTIVE NUMBER OF BITS) 1 f 12 13 SAMPLE = 140kHz DGND D3/11 0 1k 10k 100k INPUT FREQUENCY (Hz) LTC1282 • TA02 1282 TA01 1