TI
16-bit, 500 kSPS, 8-channel single-supply SAR ADC with programmable bipolar inputs up to ±10.24 V, TSSOP-38
The Texas Instruments ADS8688 is a 16-bit, 8-channel multiplexed SAR ADC that measures true bipolar signals up to ±10.24 V from a single 5 V supply. Each channel has a programmable range, 1 MΩ input impedance and ±20 V overvoltage protection, so it can connect directly to sensors without extra front-end parts. It is widely used in PLC analog input modules, power automation and grid protection relays. Lead times are extended; Cerametronics helps buyers locate traceable stock and can point to TI’s newer drop-in ADS8688W.
Key Specifications
Verify against the original datasheet before quoting.
| Resolution / Throughput | 16-bit, 500 kSPS aggregate, 8 multiplexed channels |
|---|---|
| Input Ranges | Software-programmable per channel: ±10.24 V, ±5.12 V, ±2.56 V, 0–10.24 V, 0–5.12 V; 1 MΩ input impedance; ±20 V overvoltage protection |
| Accuracy | SNR 92 dB, THD -102 dB, INL ±0.75 LSB, DNL ±0.5 LSB |
| Supply / Reference | AVDD 4.75 V to 5.25 V, DVDD 1.65 V to 5.25 V; internal 4.096 V reference or external |
| Interface / Power | SPI-compatible, daisy-chainable; 65 mW typ |
| Temperature / Package | -40 to +125 °C; TSSOP-38 (DBT), tape and reel |
Market Status
Allocated – Limited Market Stock Factory lead time is currently around 26 weeks.
Quality & Traceability
Cerametronics is ISO 9001 certified and products are RoHS compliant, with counterfeit screening and full traceability on every shipment. A Certificate of Conformance is available on request. For allocation-sensitive or high-risk lots, independent third-party lab verification can be arranged — just flag it on your RFQ. Any lot that fails incoming inspection is quarantined and never shipped.
FAQ
Is there a replacement for the ADS8688?
TI lists the ADS8688W as a newer drop-in replacement with ±12 V input ranges and differential input support. Check the input-range settings in firmware before switching.
What is the difference between ADS8688 and ADS8684?
They share one datasheet. ADS8684 has 4 input channels and ADS8688 has 8; other performance is the same.
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