SSP1120

Short Description:

The SSP1120 is a precision, 16-bit, analog-to-digital converter (ADC) that offers many integrated features to reduce system cost and component count in applications measuring small sensor signals. The device can perform conversions at data rates up to 2000 samples-per-second (SPS) with single-cycle settling. At 20 SPS, the digital filter offers simultaneous 50-Hz and 60-Hz rejection for noisy industrial applications. The internal PGA offers gains up to 128 V/V. This PGA makes the SSP1120 ideally suited for applications measuring small sensor signals, such as resistance temperature detectors (RTDs), thermocouples, thermistors, and bridge sensors. Power consumption is as low as 120 µA@3.3V when operating in duty-cycle mode with the PGA disabled. The SSP1120 is offered in a TSSOP-16 package and is specified over a temperature range of –40°C to +125°C.

Tags: Active component, Analog IC, Integrated circuit, Signal chain, Transceiver IC

Product Detail

Features

Low Current Consumption: As Low as 120 μA (typ) in Duty-Cycle Mode@3.3V
Wide Supply Range: 2.3 V to 5.5 V
Programmable Gain: 1 V/V to 128 V/V
Programmable Data Rates: Up to 2 kSPS
16-Bit Noise-Free Resolution at 20 SPS
Simultaneous 50/60-Hz Rejection at 20 SPS with Single-Cycle Settling Digital Filter
Two Differential or Four Single-Ended Inputs
Dual-Matched Programmable Current Sources: 50 μA to 1.5 mA
Internal 2.048-V Ref: 5 ppm/°C (typ) Drift
Internal 2% Accurate Oscillator
Internal Temperature Sensor: 1°C (typ)
SPI-Compatible Interface(mode1)
Package: TSSOP-16

APPLICATIONS

Temperature Sensor Measurements:
Thermistors/Thermocouples/Resistance
Temperature Detectors (RTDs): 2-, 3-, or 4-Wire Types
Resistive Bridge Sensor Measurements:
Pressure Sensors/Strain Gauges/Weigh Scales
Portable Instrumentation
Factory Automation and Process Controls

Parameter table

Absolute Maximum Ratings⁽¹⁾

Parameter		Min	Max	Unit
Power-supply voltage	AVDD to AVSS	-0.3	7	V
	DVDD to DGND	-0.3	7	V
	AVSS to DGND	–2.8	0.3	V
Analog input voltage	AIN0/REFP1, AIN1, AIN2, AIN3/REFN1, REFP0, REFN0	AVSS-0.3	AVDD+0.3	V
Digital input voltage	, SCLK, DIN, DOUT/, , CLK	DGND-0.3	DVDD+0.3	V
Input current	Continuous, any pin except power supply pins	-10	10	mA
Temperature	Junction, T_J	-40	150	℃
Temperature	Storage, T_stg	-60	150	℃

Note (1): Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Electrical Characteristics

Default Test Condition: Minimum and maximum specifications apply from T_A = –40°C to +125°C. Typical specifications are at T_A = 25°C. AVDD=DVDD=3.3V, AVSS=0V, PGA disabled, DR=20SPS, and external V_ref=2.048 V(unless otherwise noted).

Parameter	Symbol	Test Conditions	Min	Typ	Max	Unit
SYSTEM PERFORMANCE
Resolution (no missing codes)			16			Bits
Data rate	DR	Normal mode	20, 45, 90, 175, 330, 600, 1000			SPS
		Duty-cycle mode	5, 11.25, 22.5, 44, 82.5, 150, 250			SPS
		Turbo mode	40, 90, 180, 350, 660, 1200, 2000			SPS
Noise (input-referred)			See the Noise Performance section
Integral nonlinearity	INL	Gain=1 to 128, VCM=0.5*AVDD, best fit		20		ppm_FSR
Input offset voltage	VIO	PGA disabled, gain = 1 to 4, differential inputs		±2		µV
Input offset voltage	VIO	Gain= 1 to 128, differential inputs		±2		µV
Offset drift		PGA disabled, gain = 1 to 4		0.1	0.3	µV/°C
		Gain= 1 to 128, T_A= –40°C to +85°C		0.1	0.3	µV/°C
		Gain = 1 to 128		0.3	0.5	µV/°C
Gain error		PGA disabled, gain = 1 to 4		0.2		%
Gain error		Gain = 1 to 128, T_A = 25°C	-0.5	±0.2	0.5	%
Gain drift		PGA disabled, gain = 1 to 4		5		ppm/°C
Gain drift		Gain = 1 to 128		5	20	ppm/°C
Normal-mode rejection ratio	NMRR	50 Hz ±3%, DR = 20 SPS, external CLK, 50/60 bit = 10	105			dB
		60 Hz ±3%, DR = 20 SPS, external CLK, 50/60 bit = 11	105			dB
		50 Hz or 60 Hz ±3%, DR = 20 SPS, external CLK, 50/60 bit = 01	90			dB
Common-mode rejection ratio	CMRR	At dc, gain = 1	90	97		dB
		f_(CM)= 50 Hz, DR = 2000 SPS		116		dB
		f_(CM)= 60 Hz, DR = 2000 SPS		116		dB
Power-supply rejection ratio	PSRR	AVDD at dc, VCM= 0.5AVDD, gain= 1	80	105		dB
Power-supply rejection ratio	PSRR	DVDD at dc, VCM=0.5AVDD, gain=1	100	115		dB
INTERNAL VOLTAGE REFERENCE
Initial accuracy		T_A = 25°C		2.048		V
Reference drift		-45~125°C		5	30	ppm/°C
		-45~85°C		4	10	ppm/°C
		0~85°C		3	7	ppm/°C
VOLTAGE REFERENCE INPUTS
Reference input current		REFP0 = V_ref, REFN0 = AVSS		180		nA
INTERNAL OSCILLATOR
Internal oscillator accuracy		Normal mode	-2	±1	2	%
EXCITATION CURRENT SOURCES (IDACs)
Current settings			50, 100, 250, 500, 1000, 1500			µA
Compliance voltage		All current settings			AVDD – 0.9	V
Accuracy		All current settings, each IDAC	-6	±1	6	%
EXCITATION CURRENT SOURCES (IDACs)
Current match		Between IDACs		±0.3		%
Temperature drift		Each IDAC		150		ppm/°C
Temperature drift matching		Between IDACs		20		ppm/°C
TEMPERATURE SENSOR
Conversion resolution				14		Bits
Temperature resolution				0.03215		°C
Accuracy		T_A = 0°C to +75°C		±0.5		°C
Accuracy		T_A = –40°C to +125°C		±1		°C
Accuracy vs analog supply voltage				0.1		°C/V
LOW-SIDE POWER SWITCH
On-resistance	R_ON			3		Ω
Current through switch					30	mA
DIGITAL INPUTS/OUTPUTS
High-level input voltage	V_IH		0.7DVDD		DVDD	V
Low-level input voltage	V_IL		DGND		0.3DVDD	V
High-level output voltage	V_OH	I_OH = 3 mA	0.8DVDD			V
Low-level output voltage	V_OL	I_OL = 3 mA			0.2DVDD	V
Input leakage, high	I_H	V_IH = 5.5 V	-10		10	µA
Input leakage, low	I_L	V_IL = DGND	-10		10	µA
POWER SUPPLY
Analog supply current	I_AVDD	Power-down mode		0.05		µA
		Duty-cycle mode, PGA disabled		135		µA
		Duty-cycle mode, gain = 1 to 16		160		µA
		Duty-cycle mode, gain = 32		172		µA
		Duty-cycle mode, gain = 64, 128		182		µA
		Normal mode, PGA disabled		342		µA
		Normal mode, gain = 1 to 16		448		µA
		Normal mode, gain = 32		499		µA
		Normal mode, gain = 64, 128		550		µA
		Turbo mode, PGA disabled		402		µA
		Turbo mode, gain = 1 to 16		613		µA
		Turbo mode, gain = 32		715		µA
		Turbo mode, gain = 64, 128		817		µA
Digital supply current	I_DVDD	Power-down mode		1.3		µA
		Duty-cycle mode		44		µA
		Normal mode		43		µA
		Turbo mode		73		µA
POWER SUPPLY
Power dissipation	P_D	Duty-cycle mode, PGA disabled		0.5907		mW
		Normal mode, gain = 1 to 16		1.6203		mW
		Turbo mode, gain = 1 to 16		2.2638		mW

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