ADS1232

24-bit Delta-Sigma Analog-to-Digital Converter

The ADS1232 is a 24-bit delta-sigma analog-to-digital converter from Texas Instruments. View the full ADS1232 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

Official ADS1232 datasheet (PDF) — the source this page was extracted from.

Manufacturer

Texas Instruments

ADS1232 Key Specifications

Parameter	Value
Clock	internal oscillator or external crystal/oscillator
PGA Gain	1, 2, 64, 128
Data Rate	10SPS or 80SPS
Interface	2-wire serial
RMS Noise	17nV at 10SPS (gain = 128), 44nV at 80SPS (gain = 128)
Resolution	24 bits
Input Channels	2 differential plus internal temperature sensor
Supply Voltage	2.7V to 5.3V
50/60Hz Rejection	100dB simultaneous (10SPS)
Reference Voltage	up to 5V external
Package Dimensions	7.80mm × 4.40mm
Effective Resolution	23.5 bits (gain = 1)
Noise-Free Resolution	19.2 bits (gain = 64)
Operating Temperature	-40°C to +105°C
Full-Scale Differential Input	±2.5V, ±1.25V, ±39mV, ±19.5mV

ADS1232 Overview

Part: ADS1232IPWR — Texas Instruments (ADS123x family: ADS1232 / ADS1234)

Type: 24-Bit Delta-Sigma ADC with PGA for Bridge Sensors

Description: 24-bit delta-sigma ADC with low-noise PGA (gain 1, 2, 64, 128), 2.7–5.3 V supply, selectable 10 SPS or 80 SPS data rates, and 23.5-bit effective resolution; the ADS1232 has 2 differential channels plus a temperature sensor, and the ADS1234 has 4 differential channels.

Operating Conditions:

Supply voltage: 2.7–5.3 V (AVDD and DVDD)
Operating temperature: -40 to +105 °C
Reference voltage (VREF): 1.5 V to AVDD + 0.1 V
External clock: 0.2–8 MHz; serial clock up to 5 MHz

Absolute Maximum Ratings:

Max supply voltage: 6 V (AVDD to AGND, DVDD to DGND)
Max continuous input current: ±10 mA (all pins except power-supply pins)
Max junction temperature: 150 °C
Storage temperature: -60 to 150 °C

Key Specs:

Resolution: 24 bits, no missing codes
Data rate (internal oscillator): 80 SPS typ (SPEED = high), 10 SPS typ (SPEED = low)
INL: ±0.0002 % of FSR typ (gain = 1, 2); ±0.0004 % of FSR typ (gain = 64, 128)
Input offset error: ±0.2 ppm of FS typ (gain = 1); ±0.02 ppm of FS typ (gain = 128)
Gain error: ±0.001 % typ (gain = 1)
CMRR (DC): 110 dB typ at gain = 1 and 110 dB typ at gain = 128 (min 95 dB)
Analog supply current (normal mode, AVDD = 5 V): 650 μA typ at gain = 1, 2; 1350 μA typ at gain = 64, 128
Total power dissipation (AVDD = DVDD = 5 V): 3.7 mW typ at gain = 1, 2; 7.1 mW typ at gain = 64, 128; standby 0.3 mW typ
Power-down supply current: 0.1 μA typ (AVDD), 0.2 μA typ (DVDD)

Features:

Complete front-end for bridge sensors
23.5-bit effective resolution at gain = 1; 19.2-bit noise-free resolution at gain = 64
Low-noise PGA with selectable gains of 1, 2, 64, 128
RMS noise: 17 nV at 10 SPS and 44 nV at 80 SPS (gain = 128)
100 dB simultaneous 50 Hz and 60 Hz rejection
Low-drift internal oscillator or optional external crystal
External reference up to 5 V for ratiometric measurements
Internal temperature sensor (ADS1232)
Two-wire serial interface; pin-driven control with no registers to program
Standby and power-down modes; on-demand offset calibration

Applications:

Weigh scales
PLC weight modules
Pressure sensors

Package:

PW TSSOP-24, 7.8 mm × 6.4 mm (ADS1232)
PW TSSOP-28, 9.7 mm × 6.4 mm (ADS1234)

ADS1232 Features

Complete front-end for bridge sensors
23.5-bits effective resolution at gain = 1
19.2-bits noise-free resolution at gain = 64
Low-noise PGA
Selectable gains of 1, 2, 64, and 128
RMS noise:
-17nV at 10SPS at gain = 128
-44nV at 80SPS at gain = 128
100dB simultaneous 50Hz and 60Hz rejection
Flexible clocking:
-Low-drift internal oscillator
-Optional external crystal
Selectable 10SPS or 80SPS data rates
Easy ratiometric measurements:
-External voltage reference up to 5V
Two-channel differential input with internal temperature sensor (ADS1232)
Four-channel differential input (ADS1234)
Two-wire serial interface
Supply voltage range: 2.7V to 5.3V
Temperature range: -40°C to +105°C
Packages: TSSOP-24 (ADS1232) or TSSOP-28 (ADS1234)

ADS1232 Applications

ADS1232 Electrical Characteristics

minimum and maximum specifications apply from TA = -40°C to +105°C; typical specifications are at TA = 25°C; all specifications are at AVDD = DVDD = V(REFP) = 5V, V(REFN) = AGND, and fCLK = 4.9152MHz (unless otherwise noted)

PARAMETER	PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
ANALOG INPUTS	ANALOG INPUTS	ANALOG INPUTS Gain = 1	ANALOG INPUTS	ANALOG INPUTS ±3	ANALOG INPUTS	ANALOG INPUTS
	Differential input current	Gain = 2 Gain = 64, 128		±6 ±3.5		nA
SYSTEM PERFORMANCE	SYSTEM PERFORMANCE	SYSTEM PERFORMANCE	SYSTEM PERFORMANCE	SYSTEM PERFORMANCE	SYSTEM PERFORMANCE	SYSTEM PERFORMANCE
	Resolution	No missing codes	24			Bits
		Internal oscillator, SPEED = high	78	80	82.4
		Internal oscillator, SPEED = low	9.75	10	10.3
f DATA	Data rate	External oscillator, SPEED = high External oscillator, SPEED = low		CLK / 61,440 CLK / 491,520		SPS
	Digital filter settling time	Full settling, readings synchronized with A0, A1 pins		4		Conversions
	Integral nonlinearity	Differential input, end-point fit, gain = 1, 2	-0.001	±0.0002	0.001
INL		Differential input, end-point fit, gain = 64, 128		±0.0004		%of FSR (1)
	Input offset error (2)	Gain = 1	-5	±0.2	5
		Gain = 128	-1	±0.02	1	ppm of FS
	Input offset drift	Gain = 1 Gain = 128		±0.3 ±10		μV/°C nV/°C
	Gain error (3)	Gain = 1	-0.02	±0.001	0.02	%
	Gain drift	Gain = 128 Gain = 1 Gain = 128 Internal oscillator, f DATA = 10SPS	-0.1	±0.01 ±0.2 ±2.5	0.1	ppm/°C
NMRR	Normal-mode rejection ratio (4)	f IN = 50Hz or 60Hz, ±1Hz External oscillator, f DATA = 10SPS f IN = 50Hz or 60Hz, ±1Hz At DC, gain = 1, ΔV = 1V, V CM = AVDD / 2	100 120 95	110 130 110		dB
CMRR	Common-mode rejection ratio	At DC, gain = 128, ΔV = 0.1V, V CM = AVDD / 2	95	110		dB
e		AVDD, at DC, gain = 1, ΔV = 1V		Performance	section
n	Input-referred noise		See the Noise	85		dB
PSRR	Power-supply rejection	AVDD, at DC, gain = 128, ΔV = 0.1V	100	120
VOLTAGE REFERENCE INPUT	VOLTAGE REFERENCE INPUT Input current	VOLTAGE REFERENCE INPUT	VOLTAGE REFERENCE INPUT	VOLTAGE REFERENCE INPUT 10	VOLTAGE REFERENCE INPUT	VOLTAGE REFERENCE INPUT nA
DIGITAL LOGIC LEVELS	DIGITAL LOGIC LEVELS	DIGITAL LOGIC LEVELS	DIGITAL LOGIC LEVELS	DIGITAL LOGIC LEVELS	DIGITAL LOGIC LEVELS	DIGITAL LOGIC LEVELS
V IH	High-level input voltage		0.7 DVDD			V
V IL	Low-level input voltage				0.2 DVDD	V
V OH	High-level output voltage	I OH = 1mA	DVDD - 0.4			V
V OL	Low-level output voltage	I OL = 1mA			0.2 DVDD	V
	Input leakage current	0V < V IN < DVDD	-10		10	μA

ADS1232 Absolute Maximum Ratings

over operating ambient temperature range (unless otherwise noted) (1)

		MIN	MAX	UNIT
Power-supply voltage	AVDD to AGND	-0.3	6	V
Power-supply voltage	DVDD to DGND	-0.3	6	V
Power-supply voltage	AGND to DGND	-0.3	0.3	V
Analog input voltage	AINNx, AINPx, REFP, REFN	AGND - 0.3	AVDD + 0.3	V
Digital input voltage	A0, A1, CLKIN/XTAL1, XTAL2, DRDY/DOUT, GAIN0, GAIN1, PWDN, SCLK, SPEED	DGND - 0.3	DVDD + 0.3	V
Input current	Continuous, all pins except power-supply pins (2)	-10	10	mA
Temperature	Junction, T J		150	°C
Temperature	Storage, T stg	-60	150	°C

ADS1232 Recommended Operating Conditions

over operating ambient temperature range (unless otherwise noted)

			MIN	NOM	MAX	UNIT
POWER SUPPLY	POWER SUPPLY	POWER SUPPLY	POWER SUPPLY	POWER SUPPLY	POWER SUPPLY	POWER SUPPLY
	Analog power supply	AVDD to AGND	2.7		5.3	V
	Digital power supply	DVDD to DGND	2.7		5.3	V
ANALOG INPUTS	ANALOG INPUTS	ANALOG INPUTS	ANALOG INPUTS	ANALOG INPUTS	ANALOG INPUTS	ANALOG INPUTS
	Full-scale input voltage	V (AINPx) - V (AINNx)	±0.5 V REF / Gain	±0.5 V REF / Gain	±0.5 V REF / Gain	V
	Common-mode input range	Gain = 1 and 2	AGND - 0.1		AVDD + 0.1	V
	Common-mode input range	Gain = 64 and 128	AGND + 1.5		AVDD - 1.5	V
VOLTAGE REFERENCE INPUTS	VOLTAGE REFERENCE INPUTS	VOLTAGE REFERENCE INPUTS	VOLTAGE REFERENCE INPUTS	VOLTAGE REFERENCE INPUTS	VOLTAGE REFERENCE INPUTS	VOLTAGE REFERENCE INPUTS
V REF	Voltage reference input	V REF = V (REFP) - V (REFN)	1.5	AVDD	AVDD + 0.1	V
V (REFN)	Negative reference input		AGND - 0.1		V (REFP) - 1.5	V
V (REFP)	Positive reference input		V (REFN) + 1.5		AVDD + 0.1	V
EXTERNAL CLOCK INPUT	EXTERNAL CLOCK INPUT	EXTERNAL CLOCK INPUT	EXTERNAL CLOCK INPUT	EXTERNAL CLOCK INPUT	EXTERNAL CLOCK INPUT	EXTERNAL CLOCK INPUT
f CLK	External clock frequency		0.2	4.9152	8	MHz
SERIAL INTERFACE CLOCK INPUT	SERIAL INTERFACE CLOCK INPUT	SERIAL INTERFACE CLOCK INPUT	SERIAL INTERFACE CLOCK INPUT	SERIAL INTERFACE CLOCK INPUT	SERIAL INTERFACE CLOCK INPUT	SERIAL INTERFACE CLOCK INPUT
f (SCLK)	Serial clock frequency				5	MHz
DIGITAL INPUTS	DIGITAL INPUTS	DIGITAL INPUTS	DIGITAL INPUTS	DIGITAL INPUTS	DIGITAL INPUTS	DIGITAL INPUTS
	Input voltage		DGND		DVDD + 0.1	V
TEMPERATURE	TEMPERATURE	TEMPERATURE	TEMPERATURE	TEMPERATURE	TEMPERATURE	TEMPERATURE
T A	Operating ambient temperature		-40		105	°C

ADS1232 Thermal Information

THERMAL METRIC (1)	THERMAL METRIC (1)	ADS1232 PW (TSSOP) 24 PINS	ADS1234 PW (TSSOP) 28 PINS	UNIT
R θJA	Junction-to-ambient thermal resistance	82.4	74.3	°C/W
R θJC(top)	Junction-to-case (top) thermal resistance	25.5	21.9	°C/W
R θJB	Junction-to-board thermal resistance	38.1	32.9	°C/W
ψ JT	Junction-to-top characterization parameter	1.3	1.1	°C/W
ψ JB	Junction-to-board characterization parameter	37.6	32.4	°C/W

ADS1232 Typical Application

The ADS123x devices are high-resolution, 24-bit ADCs with an integrated low-noise PGA. Best performance is achieved by following the guidelines and recommendations described in the Typical Application section.

ADS1232 Package Information

PART NUMBER	PACKAGE (1)	PACKAGE SIZE (2)
ADS1232	PW (TSSOP, 24)	7.8mm × 6.4mm
ADS1234	PW (TSSOP, 28)	9.7mm × 6.4mm

(1) For more information, see the Mechanical, Packaging, and Orderable Information .
(2) The package size (length × width) is a nominal value and includes pins where applicable.

Block Diagram

Variants on the same datasheet

These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.

Part Number	Manufacturer	Package
ADS1232IPW	Texas Instruments	TSSOP-24
ADS1232IPWG4	Texas Instruments	TSSOP-24
ADS1232IPWR	Texas Instruments	TSSOP-24
ADS1234	Texas Instruments	TSSOP-28

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All ADC / DAC datasheets All Texas Instruments datasheets (2,442)

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