Texas Instruments' ADS8688 are 8-channel integrated data acquisition systems based on a 16-bit, successive approximation (SAR) analog-to-digital converter (ADC) operating at a throughput of 500 kSPS. The devices feature integrated analog front-end circuitry for each input channel with overvoltage protection up to ±20 V, a 4- or 8-channel multiplexer with automatic and manual scanning modes, and an on-chip, 4.096 V reference with low temperature drift. Operating on a single 5 V analog supply, each input channel on the devices can support true bipolar input ranges of ±10.24 V, ±5.12 V, and ±2.56 V, as well as unipolar input ranges of 0 V to 10.24 V and 0 V to 5.12 V. The gain of the analog front-end for all input ranges is accurately trimmed to ensure a high DC precision. The input range selection is software-programmable and independent for each channel. The devices offer a 1 MΩ constant resistive input impedance irrespective of the selected input range.
The ADS8688 offer a simple, SPI-compatible serial interface to the digital host and also support daisy-chaining of multiple devices. The digital supply operates from 1.65 V to 5.25 V, enabling direct interface to a wide range of host controllers.
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- 16-bit ADC with integrated analog front-end
- 8-channel MUX with auto and manual scan
- Channel-independent programmable input ranges:
- Bipolar: ±10.24 V, ±5.12 V, and ±2.56 V
- Unipolar: 10.24 V, 5.12 V
- 5 V analog supply: 1.65 V to 5 V I/O supply
- Constant resistive input impedance: 1 MΩ
- Input over-voltage protection: up to ±20 V
- On-chip, 4.096 V reference with low drift
- AUX input → direct connection to ADC inputs
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- Excellent performance:
- 500 kSPS aggregate throughput
- DNL: ±0.5 LSB; INL: ±0.75 LSB
- Low drift for gain error and offset
- SNR: 92 dB; THD: -102 dB
- Low power: 65 mW
- SPI™-compatible interface with daisy-chain
- -40°C to 125°C industrial temperature range
- TSSOP-38 package (9.7 mm x 4.4 mm)
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Texas Instruments' ADS8688 are 8-channel integrated data acquisition systems based on a 16-bit, successive approximation (SAR) analog-to-digital converter (ADC) operating at a throughput of 500 kSPS. The devices feature integrated analog front-end circuitry for each input channel with overvoltage protection up to ±20 V, a 4- or 8-channel multiplexer with automatic and manual scanning modes, and an on-chip, 4.096 V reference with low temperature drift. Operating on a single 5 V analog supply, each input channel on the devices can support true bipolar input ranges of ±10.24 V, ±5.12 V, and ±2.56 V, as well as unipolar input ranges of 0 V to 10.24 V and 0 V to 5.12 V. The gain of the analog front-end for all input ranges is accurately trimmed to ensure a high DC precision. The input range selection is software-programmable and independent for each channel. The devices offer a 1 MΩ constant resistive input impedance irrespective of the selected input range.
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