ADS8661IPWR from Texas Instruments, in a TSSOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	DGND	power_in	Digital ground pin. Decouple with the DVDD pin.
2	AVDD	power_in	Analog supply pin. Decouple with the AGND pin.
3	AGND	power_in	Analog ground pin. Decouple with the AVDD pin.
4	REFIO	bidirectional	Internal reference output and external reference input pin. Decouple with REFGND.
5	REFGND	power_in	Reference ground pin; short to the analog ground plane. Decouple with the REFIO and REFCAP pins.
6	REFCAP	output	ADC reference buffer decoupling capacitor pin. Decouple with the REFGND pin.
7	AIN_P	input	Analog input: positive. Decouple with the AIN_GND pin.
8	AIN_GND	input	Analog input: negative. Decouple with the AIN_P pin.
9	RST	input	Active low logic input to reset the device.
10	SDI	input	Dual function: data input pin for serial communication, which also receives chain data in daisy-chain mode.
11	CONVST/CS	input	Dual-functionality pin: active high CONVST starts conversion on a rising edge, and active low CS takes control of the data bus while SDO-x go to tri-state when CS is high.
12	SCLK	input	Serial communication clock input pin for the serial interface; all system-synchronous data transfer protocols are timed with respect to SCLK.
13	SDO-0	output	Serial communication data output 0.
14	ALARM/SDO-1/GPO	output	Multi-function output pin that serves as an active high alarm, data output 1 for serial communication, or general-purpose output.
15	RVS	output	Multi-function output pin for the serial interface; with CS high it reflects the internal ADCST status, and with CS low its behavior depends on the output protocol selected.
16	DVDD	power_in	Digital supply pin. Decouple with the DGND pin.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	TSSOP-16
Category	Data Acquisition
Pins	16

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Analog input voltage AIN_P, AIN_GND to GND		-20		20	V	AVDD = 5 V	5
Analog input voltage AIN_P, AIN_GND to GND		-15		15	V	AVDD = floating	5
AVDD to GND or DVDD to GND		-0.3		7	V		5
REFCAP to REFGND or REFIO to REFGND		-0.3		5.7	V		5
GND to REFGND		-0.3		0.3	V		5
Operating free-air temperature	TA	-40		125	°C		5
Storage temperature	Tstg	-65		150	°C		5
Analog supply voltage	AVDD	4.75	5	5.25	V		5
Digital supply voltage	DVDD	1.65	3.3		V		5
Full-scale input span (AIN_P to AIN_GND)	VIN	-12.288		12.288	V	Input range = ±3 × VREF	6
Full-scale input span (AIN_P to AIN_GND)	VIN	-10.24		10.24	V	Input range = ±2.5 × VREF	6
Full-scale input span (AIN_P to AIN_GND)	VIN	-6.144		6.144	V	Input range = ±1.5 × VREF	6
Full-scale input span (AIN_P to AIN_GND)	VIN	-5.12		5.12	V	Input range = ±1.25 × VREF	6
Full-scale input span (AIN_P to AIN_GND)	VIN	-2.56		2.56	V	Input range = ±0.625 × VREF	6
Full-scale input span (AIN_P to AIN_GND)	VIN	0		12.288	V	Input range = 3 × VREF	6
Full-scale input span (AIN_P to AIN_GND)	VIN	0		10.24	V	Input range = 2.5 × VREF	6
Full-scale input span (AIN_P to AIN_GND)	VIN	0		6.144	V	Input range = 1.5 × VREF	6
Full-scale input span (AIN_P to AIN_GND)	VIN	0		5.12	V	Input range = 1.25 × VREF	6
AIN_GND operating input range		-0.1	0	0.1	V	All input ranges	6
Input impedance	RIN	1.02	1.2	1.38	MΩ	At TA = 25°C, Input range = ±3 × VREF	6
Input impedance	RIN	0.85	1	1.15	MΩ	At TA = 25°C, Input range = ±2.5 × VREF	6
Input overvoltage protection voltage	VOVP	-20		20	V	AVDD = 5 V, all input ranges	6
Input overvoltage protection voltage	VOVP	-15		15	V	AVDD = floating, all input ranges	6
Differential nonlinearity	DNL	-0.35	0.1	0.35	LSB	All input ranges	7
Integral nonlinearity	INL	-0.35	0.15	0.35	LSB	All input ranges	7
Offset error, bipolar ranges	EO	-1	0.2	1	mV	At TA = 25°C, all bipolar ranges	7
Offset error, unipolar ranges	EO	-2	0.2	2	mV	At TA = 25°C, all unipolar ranges	7
Offset error drift with temperature		-3	0.75	3	ppm/°C	All input ranges	7
Gain error	EG	-0.025	0.01	0.025	%FSR	At TA = 25°C, all input ranges	7
Gain error drift with temperature		-5	1	5	ppm/°C	All input ranges	7
Signal-to-noise ratio	SNR	73	73.5		dB	All input ranges	7
Signal-to-noise + distortion	SINAD	72.9	73.4		dB	All input ranges	7
Internal reference voltage on REFIO pin	VREFIO	4.095	4.096	4.097	V	At TA = 25°C	7
Reference voltage to the ADC on REFCAP pin	VREFCAP	4.095	4.096	4.097	V	At TA = 25°C	7
External reference voltage on REFIO	VREFIO_EXT	4.046	4.096	4.146	V	REFIO pin configured as an input	7
Analog power-supply voltage	AVDD	4.75	5	5.25	V		8
Digital power-supply voltage, operating range	DVDD	1.65	3.3		V	Operating range	8
Digital power-supply voltage, supply range for specified performance	DVDD	2.7	3.3		V	Supply range for specified performance	8
Junction-to-ambient thermal resistance	RθJA		95.7		°C/W		5
Junction-to-case (top) thermal resistance	RθJC(top)		29.3		°C/W		5
Junction-to-board thermal resistance	RθJB		41.5		°C/W		5
Junction-to-top characterization parameter	ψJT		1.5		°C/W		5
Junction-to-board characterization parameter	ψJB		40.8		°C/W		5

CAD (KiCad official)

Symbol: ADS8661IPWR
Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
3D model: TSSOP-16 (KiCad packages3D, STEP)
3D model files: ads8661ipwr-etched.step / ads8661ipwr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ads8661ipwr.step / ads8661ipwr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (72 pp, sha256 f743878a6234825a, retrieved 2026-11-05, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

ADS8661IPWR

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3D Model

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