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ADS7870

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12-Bit ADC, MUX, PGA and Internal Reference Data Acquisition System

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Data sheet

ADS7870

ACTIVE
Data sheet Order now

Product details

Resolution (Bits) 12 Sample rate (max) (ksps) 52 Number of input channels 8 Interface type SPI Architecture SAR Input type Differential, Single-ended Multichannel configuration Multiplexed Rating Catalog Reference mode External, Internal Input voltage range (max) (V) 5.5 Input voltage range (min) (V) 0 Features Oscillator, PGA Operating temperature range (°C) -40 to 85 Power consumption (typ) (mW) 6 Analog supply voltage (min) (V) 2.7 Analog supply voltage (max) (V) 5.5 Digital supply (min) (V) 2.7 Digital supply (max) (V) 5.5
Resolution (Bits) 12 Sample rate (max) (ksps) 52 Number of input channels 8 Interface type SPI Architecture SAR Input type Differential, Single-ended Multichannel configuration Multiplexed Rating Catalog Reference mode External, Internal Input voltage range (max) (V) 5.5 Input voltage range (min) (V) 0 Features Oscillator, PGA Operating temperature range (°C) -40 to 85 Power consumption (typ) (mW) 6 Analog supply voltage (min) (V) 2.7 Analog supply voltage (max) (V) 5.5 Digital supply (min) (V) 2.7 Digital supply (max) (V) 5.5
SSOP (DB) 28 79.56 mm² 10.2 x 7.8
  • PGA Gains: 1, 2, 4, 5, 8, 10, 16, 20V/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: 52 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 ADS7871
  • SSOP-28 Package
  • APPLICATIONS
    • Portable Battery-Powered Systems
    • Low-Power Instrumentation
    • Low-Power Control Systems
    • Smart Sensor Applications

QSPI and SPI are trademarks of Motorola, Inc.
Microwire is a trademark of National Semiconductor Corporation.
All other trademarks are the property of their respective owners.
  • PGA Gains: 1, 2, 4, 5, 8, 10, 16, 20V/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: 52 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 ADS7871
  • SSOP-28 Package
  • APPLICATIONS
    • Portable Battery-Powered Systems
    • Low-Power Instrumentation
    • Low-Power Control Systems
    • Smart Sensor Applications

QSPI and SPI are trademarks of Motorola, Inc.
Microwire is a trademark of National Semiconductor Corporation.
All other trademarks are the property of their respective owners.

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-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 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.

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-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 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.
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Top documentation Type Title Format options Date
* Data sheet 12-Bit ADC, MUX, PGA and Internal Reference Data Acquisition System datasheet (Rev. C) 19 Dec 2005
E-book Best of Baker's Best: Precision Data Converters -- SAR ADCs 21 May 2015
Application note Getting the Full Potential from your ADC (Rev. B) 15 May 2015
Application note Determining Minimum Acquisition Times for SAR ADCs, part 2 17 Mar 2011
Application note Determining Minimum Acquisition Times for SAR ADCs, part 1 (Rev. A) 10 Nov 2010
User guide ADS7870/ADS7871 EVM 09 Sep 2003
Application note Interfacing the ADS7870 and the MC68HC11E9 Analog to Microcomputer Made Easy 27 Sep 2000

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