ADS7871 - 14-Bit 48KSPS DAS with ADC, MUX, PGA and Internal Reference

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.

Products containing the "ADS7871" keyword are: ADS7871DB , ADS7871EVM , ADS7871IDB , ADS7871IDB , ADS7871IDBG4 , ADS7871IDBG4 , ADS7871IDBR , ADS7871IDBR , ADS7871IDBRG4

• 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

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