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ADS8691IPWR +BOM

18 Bit Analog to Digital Converter 1 Input 1 SAR 16-TSSOP

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

ADS8691IPWR
Datasheet:

ADS8691IPWR Datasheet (PDF)
Series:

ADS869x
Number of Bits:

18
Sampling Rate (Per Second):

1M
Number of Inputs:

1
EDA/CAD Models:

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ADS8691IPWR General Description

The ADS8691, ADS8695, and ADS8699 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.

Key Features

18-bit ADC with integrated analog front-end
High speed:
- ADS8691: 1 MSPS
- ADS8695: 500 kSPS
- ADS8699: 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: ±0.6 LSB; INL: ±1.75 LSB
- SNR: 92.5 dB; THD: –110 dB
ALARM → high, low threshold
multiSPI™ interface with daisy-chain
Extended industrial temperature range: –40°C to +125°C

Specifications

Category	Integrated Circuits (ICs)Data AcquisitionAnalog to Digital Converters (ADC)	Series	ADS869x
Number of Bits	18	Sampling Rate (Per Second)	1M
Number of Inputs	1	Input Type	Differential, Pseudo-Differential, Single Ended
Data Interface	SPI	Configuration	PGA-ADC
Ratio - S/H:ADC	0:1	Number of A/D Converters	1
Architecture	SAR	Reference Type	Internal
Voltage - Supply, Analog	4.75V ~ 5.25V	Voltage - Supply, Digital	1.65V ~ 3.3V
Features	Internal Oscillator	Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount	Base Product Number	ADS8691
Resolution (Bits)	18	Sample rate (max) (ksps)	1000
Number of input channels	1	Interface type	Enhanced SPI, SPI
Input type	Single-ended	Rating	Catalog
Reference mode	External, Internal	Input voltage range (max) (V)	12.288
Input voltage range (min) (V)	-12.288	Operating temperature range (°C)	-40 to 125
Power consumption (typ) (mW)	42	Analog supply (min) (V)	4.75
Analog supply voltage (max) (V)	5.25	SNR (dB)	92.5
Digital supply (min) (V)	1.65	Digital supply (max) (V)	5.25
Pin Count	16	Released Date	May 9, 2020
Last Modified Date	Mar 7, 2023 4:10 PM UTC