ADS7870

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

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Product details

Parameters

Resolution (Bits) 12 Number of input channels 8 Sample rate (Max) (kSPS) 52 Interface type SPI Architecture SAR Input type Differential, Single-Ended Multi-channel configuration Multiplexed Rating Catalog Reference mode Ext, Int Input range (Max) (V) 5.5 Input range (Min) (V) 0 Features Oscillator, PGA Operating temperature range (C) -40 to 85 Power consumption (Typ) (mW) 6 Analog voltage AVDD (Min) (V) 2.7 Analog voltage AVDD (Max) (V) 5.5 INL (Max) (+/-LSB) 2.5 Digital supply (Min) (V) 2.7 Digital supply (Max) (V) 5.5 open-in-new Find other Precision ADCs (<=10MSPS)

Package | Pins | Size

SSOP (DB) 28 54 mm² 10.5 x 5.3 open-in-new Find other Precision ADCs (<=10MSPS)

Features

  • 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.

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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-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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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 7
Type Title Date
* Datasheet 12-Bit ADC, MUX, PGA and Internal Reference Data Acquisition System datasheet (Rev. C) Dec. 19, 2005
E-book Best of Baker's Best: Precision Data Converters -- SAR ADCs May 21, 2015
Application note Getting the Full Potential from your ADC (Rev. B) May 15, 2015
Application note Determining Minimum Acquisition Times for SAR ADCs, part 2 Mar. 17, 2011
Application note Determining Minimum Acquisition Times for SAR ADCs, part 1 (Rev. A) Nov. 10, 2010
User guide ADS7870/ADS7871 EVM Sep. 09, 2003
Application note Interfacing the ADS7870 and the MC68HC11E9 Analog to Microcomputer Made Easy Sep. 27, 2000

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOL Download
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide
CALCULATION TOOL Download
Analog-to-digital converter (ADC) input driver design tool supporting multiple input types
ADC-INPUT-CALC ADC-INPUT-CALC is an online tool that provides support for designing the input buffer to an analog-to-digital converter (ADC). It offers 24 different op-amp based buffer circuits that can be used to drive an ADC input. The available topologies cover differential, single-ended and transformer-coupled (...)
CALCULATION TOOL Download
Analog engineer's calculator
ANALOG-ENGINEER-CALC — The Analog Engineer’s Calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting op-amp gain with feedback (...)
Features
  • Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
    • Noise calculations
    • Common unit translation
  • Solves common amplifier circuit design problems
    • Gain selections using standard resistors
    • Filter configurations
    • Total noise for common amplifier configurations
  • (...)

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SSOP (DB) 28 View options

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