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.
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.
| 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 (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 |
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