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ADS7867 Arkusz danych(PDF) 1 Page - Texas Instruments |
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ADS7867 Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 29 page BurrBrown Products from Texas Instruments FEATURES APPLICATIONS DESCRIPTION _ + CDAC SAR Conversion and Control Logic Comparator 12/10/8 BIT ADC VIN REF/VDD CS SCLK SDO GND S/H ADS7866 ADS7867 ADS7868 SLAS465 – JUNE 2005 1.2-V, 12-/10-/8-BIT, 200-KSPS/100-KSPS, MICRO-POWER, MINIATURE ANALOG-TO-DIGITAL CONVERTER WITH SERIAL INTERFACE The sampling, conversion, and activation of digital output SDO are initiated on the falling edge of CS. • Single 1.2-V to 3.6-V Supply Operation The serial clock SCLK is used for controlling the • High Throughput conversion rate and shifting data out of the converter. Furthermore, SCLK provides a mechanism to allow – 200/240/280KSPS for 12/10/8-Bit VDD ≥ 1.6 V digital host processors to synchronize with the con- – 100/120/140KSPS for 12/10/8-Bit VDD ≥ 1.2 V verter. These converters interface with • ±1.5LSB INL, 12-Bit NMC (ADS7866) micro-processors or DSPs through a high-speed SPI • 71 dB SNR, –83 dB THD at fIN = 30 kHz compatible serial interface. There are no pipeline delays associated with the device. (ADS7866) • Synchronized Conversion with SCLK The minimum conversion time is determined by the frequency of the serial clock input, SCLK, while the • SPI Compatible Serial Interface maximum frequency of SCLK is determined by the • No Pipeline Delays minimum sampling time required to charge the input • Low Power capacitance to 12/10/8-bit accuracy for the ADS7866/67/68, respectively. The maximum – 1.39 mW Typ at 200 KSPS, VDD = 3.6 V throughput is determined by how often a conversion – 0.39 mW Typ at 200 KSPS, VDD = 1.6 V is initiated when the minimum sampling time is met – 0.22 mW Typ at 100 KSPS, VDD = 1.2 V and the maximum SCLK frequency is used. Each • Auto Power-Down: 8 nA Typ, 300 nA Max device automatically powers down after each conver- sion, which allows each device to save power when • 0 V to VDD Unipolar Input Range the throughput is reduced while using the maximum • 6-Pin SOT-23 Package SCLK frequency. The converter reference is taken internally from the supply. Hence, the analog input range for these • Battery Powered Systems devices is 0 V to VDD. • Isolated Data Acquisition These devices are available in a 6-pin SOT-23 • Medical Instruments package and are characterized over the industrial • Portable Communication –40 °C to 85°C temperature range. • Portable Data Acquisition Systems • Automatic Test Equipment The ADS7866/67/68 are low power, miniature, 12/10/8-bit A/D converters each with a unipolar, single-ended input. These devices can operate from a single 1.6 V to 3.6 V supply with a 200-KSPS throughput for ADS7866. In addition, these devices can maintain at least a 100-KSPS throughput with a supply as low as 1.2 V. Micro-Power Miniature SAR Converter Family RESOLUTION/SPEED < 200 KSPS 1 MSPS – 1.25 MSPS 12-Bit ADS7866 (1.2 VDD to 3.6 VDD) ADS7886 (2.35 VDD to 5.25 VDD) 10-Bit ADS7867 (1.2 VDD to 3.6 VDD) ADS7887 (2.35 VDD to 5.25 VDD) 8-Bit ADS7868 (1.2 VDD to 3.6 VDD) ADS7888 (2.35 VDD to 5.25 VDD) Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Copyright © 2005, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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