Datasheet LTC1274, LTC1277 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | 12-Bit, 10mW, 100ksps ADCs with 1µA Shutdown |
| Seiten / Seite | 20 / 1 — FEATU. DESCRIPTIO. Low Power Dissipation: 10mW. Sample Rate: 100ksps. … |
| Dateiformat / Größe | PDF / 241 Kb |
| Dokumentensprache | Englisch |
FEATU. DESCRIPTIO. Low Power Dissipation: 10mW. Sample Rate: 100ksps. Power Shutdown to 1. A in Sleep Mode. APPLICATI
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LTC1274/LTC1277 12-Bit, 10mW, 100ksps ADCs with 1µA Shutdown
U FEATU S RE DESCRIPTIO
■
Low Power Dissipation: 10mW
The LTC®1274/LTC1277 are 8µs sampling 12-bit A/D ■
Sample Rate: 100ksps
converters which draw only 2mA (typ) from single 5V or ■ Samples Inputs Beyond Nyquist, 72dB S/(N + D) ±5V supplies. These easy-to-use devices come complete and 82dB THD at f with a 2 IN = 100kHz µs sample-and-hold, a precision reference and an ■ Single Supply 5V or ±5V Operation internally trimmed clock. Unipolar and bipolar conversion ■
Power Shutdown to 1
µ
A in Sleep Mode
modes add to the flexibility of the ADCs. ■ 180µA Nap Mode (LTC1277) with Instant Wake-Up Two power-down modes are available in the LTC1277. In ■ Internal Reference Can Be Overdriven Nap mode, the LTC1277 draws only 180µA and the instant ■ Internal Synchronized Clock wake-up from Nap mode allows the LTC1277 to be pow- ■ 0V to 4.096V or ±2.048V Input Ranges (1mV/LSB) ered down even during brief inactive periods. In Sleep ■ 24-Lead SO Package mode only 1µA will be drawn. A REFRDY signal is used to
O U
show the ADC is ready to sample after waking up from
APPLICATI S
Sleep mode. The LTC1274 also provides the Sleep mode and REFRDY signal. ■ Battery-Powered Portable Systems ■ High Speed Data Acquisition for PCs The A/D converters convert 0V to 4.096V unipolar inputs ■ Digital Signal Processing from a single 5V supply or ±2.048V bipolar inputs from ■ Multiplexed Data Acquisition Systems ±5V supplies. ■ Audio and Telecom Processing The LTC1274 has a single-ended input and a 12-bit ■ Spectrum Analysis parallel data format. The LTC1277 offers a differential input and a 2-byte read format. The bipolar mode is formatted as 2’s complement for the LTC1274 and offset binary for the LTC1277. , LTC and LT are registered trademarks of Linear Technology Corporation.
O U TYPICAL APPLICATI Single 5V Supply, 10mW, 100kHz, 12-Bit ADC Supply Current vs Sample Rate with Sleep and Nap Modes
LTC1277 5V 10000 1 24 ANALOG A + V C IN DD REF = 4.7µF DIFFERENTIAL INPUTS 2 23 + (0V TO 4.096V) A – IN VSS WITHOUT SLEEP OR NAP 10µF 0.1µF 3 22 2.42V VREF BUSY V µP 1000 REF OUTPUT + 4 21 AGND CS CONTROL µA) 10µF 0.1µF NAP MODE 5 20 REFRDY RD LINES 6 19 SLEEP CONVST 100 7 18 NAP HBEN OPTIONAL 3V SUPPLY 8 17 NAP = REFRDY D7 VLOGIC TO INTERFACE WITH 3V (SLEEP MODE) 9 16 PROCESSOR D6 D0/8 SUPPLY CURRENT ( 10 10 15 NAP = 5V D5 D1/9 8-BIT (SLEEP MODE) 11 14 D4 D2/10 PARALLEL 12 13 BUS DGND D3/11 1 0.1 1 10 100 1k 10k 100k LTC1274/77 • TA01 SAMPLE RATE (Hz) LTC1274/77 • TA02 1
U FEATU S RE DESCRIPTIO
■
Low Power Dissipation: 10mW
The LTC®1274/LTC1277 are 8µs sampling 12-bit A/D ■
Sample Rate: 100ksps
converters which draw only 2mA (typ) from single 5V or ■ Samples Inputs Beyond Nyquist, 72dB S/(N + D) ±5V supplies. These easy-to-use devices come complete and 82dB THD at f with a 2 IN = 100kHz µs sample-and-hold, a precision reference and an ■ Single Supply 5V or ±5V Operation internally trimmed clock. Unipolar and bipolar conversion ■
Power Shutdown to 1
µ
A in Sleep Mode
modes add to the flexibility of the ADCs. ■ 180µA Nap Mode (LTC1277) with Instant Wake-Up Two power-down modes are available in the LTC1277. In ■ Internal Reference Can Be Overdriven Nap mode, the LTC1277 draws only 180µA and the instant ■ Internal Synchronized Clock wake-up from Nap mode allows the LTC1277 to be pow- ■ 0V to 4.096V or ±2.048V Input Ranges (1mV/LSB) ered down even during brief inactive periods. In Sleep ■ 24-Lead SO Package mode only 1µA will be drawn. A REFRDY signal is used to
O U
show the ADC is ready to sample after waking up from
APPLICATI S
Sleep mode. The LTC1274 also provides the Sleep mode and REFRDY signal. ■ Battery-Powered Portable Systems ■ High Speed Data Acquisition for PCs The A/D converters convert 0V to 4.096V unipolar inputs ■ Digital Signal Processing from a single 5V supply or ±2.048V bipolar inputs from ■ Multiplexed Data Acquisition Systems ±5V supplies. ■ Audio and Telecom Processing The LTC1274 has a single-ended input and a 12-bit ■ Spectrum Analysis parallel data format. The LTC1277 offers a differential input and a 2-byte read format. The bipolar mode is formatted as 2’s complement for the LTC1274 and offset binary for the LTC1277. , LTC and LT are registered trademarks of Linear Technology Corporation.
O U TYPICAL APPLICATI Single 5V Supply, 10mW, 100kHz, 12-Bit ADC Supply Current vs Sample Rate with Sleep and Nap Modes
LTC1277 5V 10000 1 24 ANALOG A + V C IN DD REF = 4.7µF DIFFERENTIAL INPUTS 2 23 + (0V TO 4.096V) A – IN VSS WITHOUT SLEEP OR NAP 10µF 0.1µF 3 22 2.42V VREF BUSY V µP 1000 REF OUTPUT + 4 21 AGND CS CONTROL µA) 10µF 0.1µF NAP MODE 5 20 REFRDY RD LINES 6 19 SLEEP CONVST 100 7 18 NAP HBEN OPTIONAL 3V SUPPLY 8 17 NAP = REFRDY D7 VLOGIC TO INTERFACE WITH 3V (SLEEP MODE) 9 16 PROCESSOR D6 D0/8 SUPPLY CURRENT ( 10 10 15 NAP = 5V D5 D1/9 8-BIT (SLEEP MODE) 11 14 D4 D2/10 PARALLEL 12 13 BUS DGND D3/11 1 0.1 1 10 100 1k 10k 100k LTC1274/77 • TA01 SAMPLE RATE (Hz) LTC1274/77 • TA02 1