ADS7870EA

ADCs/DACs - Special Purpose Overview

The Texas Instruments ADS7870EA is a high-performance, low-power data acquisition system housed in a 28-pin SSOP package. It integrates a 12-bit successive approximation ADC, an 8-channel single-ended or 4-channel differential multiplexer, a programmable gain amplifier (PGA), and a precision internal voltage reference. The device supports a supply voltage range of 2.7 V to 5.5 V and achieves a throughput rate of 52 kSamples/sec. Key electrical parameters include a typical reference drift of 10 ppm/°C, input impedance of 6 MΩ (common-mode) and 7 MΩ (differential), and channel-to-channel crosstalk below -100 dB at 60 Hz.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 12-bit ADC with 52 kSPS throughput rate
• Programmable Gain Amplifier with gains of 1, 2, 4, 5, 8, 10, 16, and 20 V/V
• Configurable internal reference voltage source offering 1.15 V, 2.048 V, or 2.5 V outputs
• Flexible input configuration supporting 8 single-ended or 4 differential channels

ADCs/DACs - Special Purpose Applications

• Portable battery-powered systems
• Low-power instrumentation
• Smart sensor applications
• Low-power control systems

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'EA' against the official datasheet to confirm package type and temperature grade. Ensure compatibility with SPI, QSPI, Microwire, or 8051 serial interface protocols required by the host microcontroller. Confirm that the 2.7 V to 5.5 V single-supply requirement aligns with the target system power architecture.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a complete data acquisition solution is needed without external amplifiers or buffers. The PGA eliminates the need for external signal conditioning for low-level signals. Consider the 12-bit resolution and 52 kSPS speed as sufficient for most industrial sensing tasks. Verify that the 28-pin SSOP footprint fits the PCB layout constraints.

ADCs/DACs - Special Purpose Part Context

The ADS7870EA belongs to the ADS787x family of data acquisition systems from Texas Instruments. It is pin-compatible with the ADS7871, which offers 14-bit resolution but slightly lower throughput. This integration reduces board space and component count compared to discrete ADC and PGA solutions.

ADCs/DACs - Special Purpose Replacement Considerations

The ADS7871 is a confirmed pin-compatible substitute within the same family, offering higher resolution (14-bit) but reduced sampling speed (48 kSPS). Other similar devices include the ADS7833 for multi-channel needs or the SP8121 from Sipex Corporation for comparable monolithic 12-bit functionality.