ADS7870
- 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.
Technical documentation
Type | Title | 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 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
ANALOG-ENGINEER-CALC — PC software analog engineer's calculator
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 operational-amplifier (...)
Supported products & hardware
Products
Precision op amps (Vos<1mV)
General-purpose op amps
Audio op amps
Transimpedance amplifiers
High-speed op amps (GBW ≥ 50 MHz)
Power op amps
Video amplifiers
Line drivers
Transconductance amplifiers & laser drivers
Fully differential amplifiers
Precision ADCs
Biosensing AFEs
High-speed ADCs (≥10 MSPS)
Receivers
Touchscreen controllers
Difference amplifiers
Instrumentation amplifiers
Audio line receivers
Analog current-sense amplifiers
Digital power monitors
Analog current-sense amplifiers with integrated shunt resistor
Digital power monitors with integrated shunt resistor
Die & wafer services
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
TINA-TI — SPICE-based analog simulation program
Package | Pins | CAD symbols, footprints & 3D models |
---|---|---|
SSOP (DB) | 28 | Ultra Librarian |
Ordering & quality
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- Material content
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- Ongoing reliability monitoring
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Support & training
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