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See Technical Specifications

ADS8685IPWR

16-Bit, 500-kSPS, 1-Ch SAR ADC with programmable (±12/±10/±6/±5/±2.5V) input ranges on +5V supply

Manufacturer:

TI
Mfr.Part #:

ADS8685IPWR
Datasheet:

ADS8685IPWR Datasheet (PDF)
Resolution (Bits):

16
Sample rate (max) (ksps):

500
Number of input channels:

1
Interface type:

Enhanced SPI, SPI
EDA/CAD Models:

Request Free CAD Models for ADS8685IPWR

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ADS8685IPWR General Description

The ADS8681, ADS8685, and ADS8689 belong to a family of integrated data acquisition system based on a successive approximation (SAR) analog-to-digital converter (ADC). The devices feature a high-speed, high-precision SAR ADC, integrated analog front-end (AFE) input driver circuit, overvoltage protection circuit up to ±20 V, and an on-chip 4.096-V reference with extremely low temperature drift.

The devices operate on a single 5-V analog supply, but support true bipolar input ranges of ±12.288 V, ±6.144 V, ±10.24 V, ±5.12 V, and ±2.56 V, as well as unipolar input ranges of 0 V to 12.288 V, 0 V to 10.24 V, 0 V to 6.144 V, and 0 V to 5.12 V. The gain and offset errors are accurately trimmed within the specified values for each input range to ensure high dc precision. The input range selection is done by software programming of the device internal registers. The devices offer a high resistive input impedance (≥ 1 MΩ) irrespective of the selected input range.

The multiSPI digital interface is backward-compatible to the traditional SPI protocol. Additionally, configurable features simplify interface to a wide range of host controllers.

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Key Features

16-bit ADC with integrated analog front-end
High speed:
- ADS8681: 1 MSPS
- ADS8685: 500 kSPS
- ADS8689: 100 kSPS
Software programmable input ranges:
- Bipolar ranges: ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, and ±2.56 V
- Unipolar ranges: 0 V–12.288 V, 0 V–10.24 V, 0 V–6.144 V, and 0 V–5.12 V
5-V analog supply: 1.65-V to 5-V I/O supply
Constant resistive input impedance ≥ 1 MΩ
Input overvoltage protection: Up to ±20 V
On-chip, 4.096-V reference with low drift
Excellent performance:
- DNL: ±0.4 LSB; INL: ±0.5 LSB
- SNR: 92 dB; THD: –107 dB
ALARM → high, low threshold
multiSPI™ interface with daisy-chain
Extended industrial temperature range: –40°C to +125°C

Specifications

Resolution (Bits)	16	Sample rate (max) (ksps)	500
Number of input channels	1	Interface type	Enhanced SPI, SPI
Architecture	SAR	Input type	Single-ended
Rating	Catalog	Reference mode	External, Internal
Input voltage range (max) (V)	12.288	Input voltage range (min) (V)	-12.288
Features	Oscillator, Over-Voltage Protection, PGA	Operating temperature range (°C)	-40 to 125
Power consumption (typ) (mW)	29	Analog supply (min) (V)	4.75
Analog supply voltage (max) (V)	5.25	SNR (dB)	92
Digital supply (min) (V)	1.65	Digital supply (max) (V)	5.25