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ADS7870

Part Number	ADS7870
Manufacturer	Burr-Brown Corporation
Description	DATA ACQUISITION
Published	Mar 23, 2005
Detailed Description	ADS7870 SBAS124C − DECEMBER 1999 − REVISED DECEMBER 2005 12ĆBIT, 52ĆkSPS, DATA ACQUISITION SYSTEM WITH ANALOGĆTOĆDIGITA...
Datasheet	ADS7870 PDF File

Overview

ADS7870 SBAS124C − DECEMBER 1999 − REVISED DECEMBER 2005 12ĆBIT, 52ĆkSPS, DATA ACQUISITION SYSTEM WITH ANALOGĆTOĆDIGITAL CONVERTER, MUX, PGA, AND REFERENCE FEATURES D PGA Gains: 1, 2, 4, 5, 8, 10, 16, 20 V/V D Programmable Input (Up to 4-Channel Differential/Up to 8-Channel Single-Ended or Some Combination) D 1.
15-V, 2.
048-V, or 2.
5-V Internal Reference D SPI/DSP Compatible Serial Interface (≤ 20 MHz) D Throughput Rate: 52 kSamples/sec D Error Overload Indicator D Programmable Output 2s Complement/Binary D 2.
7-V to 5.
5-V Single Supply Operation D 4-Bit Digital I/O Via Serial Interface D Pin-Compatible With ADS7871 D SSOP-28 Package APPLICATIONS D Portable Battery-Powered Systems D Low-Power Instrumentation D Low-Power Control Systems D Smart Sensor Applications DESCRIPTION The ADS7870 (US patents 6140872, 6060874) is a complete low-power data acquisition system on a single chip.
It consists of a 4-channel differential/8-channel single-ended multiplexer, precision programmable gain amplifier, 12-bit successive approximation analog-todigital (A/D) converter, and a precision voltage reference.
The programmable-gain amplifier provides high input impedance, excellent gain accuracy, good common-mode rejection, and low noise.
For many low-level signals, no external amplification or impedance buffering is needed between the signal source and the A/D input.
The offset voltage of the PGA is auto-zeroed.
Gains of 1, 2, 4, 5, 8, 10, 16, and 20 V/V allow signals as low as 125 mV to produce full-scale digital outputs.
The ADS7870 contains an internal reference, which is trimmed for high initial accuracy and stability vs temperature.
Drift is typically 10 ppm/°C.
An external reference can be used in situations where multiple ADS7870s share a common reference.
The serial interface allows the use of SPI, QSPI, Microwire, and 8051-family protocols, without glue logic.
VREF LN0 LN1 LN2 LN3 LN4 LN5 LN6 LN7 MUX I/O0 I/O1 I/O2 I/O3 Digital I/O REF BUFIN BUFOUT/REFIN Oscilla...

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