The ADS7871 (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, 14-bit successive approximation analog-to-digital (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 ADS7871 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 ADS7871s share a common reference.
●The serial interface allows the use of SPI, QSPI, Microwire, and 8051-family protocols, without glue logic.
● PGA Gains: 1, 2, 4, 5, 8, 10, 16, 20 V/V
● Programmable Input (Up to 4-Channel Differential/Up to 8-Channel Single-Ended or Some Combination)
● 1.15-V, 2.048-V, or 2.5-V Internal Reference
● SPI/DSP Compatible Serial Interface ( 20 MHz)
● Throughput Rate: 48 kSamples/sec
● Error Overload Indicator
● Programmable Output 2s Complement/Binary
● 2.7-V to 5.5-V Single Supply Operation
● 4-Bit Digital I/O Via Serial Interface
● Pin Compatible With ADS7870
● SSOP-28 Package
● APPLICATIONS
● Portable Battery-Powered Systems
● Low-Power Instrumentation
● Low-Power Control Systems
● Smart Sensor Applications
●All trademarks are the property of their respective owners.
