0
ACTIVE
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
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.
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