ADS1232IPW
24-bit Delta-Sigma Analog-to-Digital ConverterThe ADS1232IPW is a 24-bit delta-sigma analog-to-digital converter from Texas Instruments. View the full ADS1232IPW datasheet below including electrical characteristics, absolute maximum ratings.
Manufacturer
Texas Instruments
Category
24-bit Delta-Sigma Analog-to-Digital Converter
Overview
Part: ADS1232, ADS1234 — Texas Instruments
Type: 24-bit Delta-Sigma Analog-to-Digital Converter
Description: The ADS123x is a precise 24-bit Delta-Sigma ADC with a low-noise programmable gain amplifier (PGA), offering 19.2-bit noise-free resolution and 23.5-bit effective resolution, designed as a complete front-end solution for bridge sensor applications.
Operating Conditions:
- Supply voltage: 2.7V to 5.3V
- Operating temperature: -40°C to +105°C
- Data rate: 10SPS or 80SPS
Absolute Maximum Ratings:
- Max supply voltage: 6V (AVDD to AGND, DVDD to DGND)
- Max junction/storage temperature: +150°C
Key Specs:
- Noise-free resolution: 19.2 bits (Gain = 64, 10SPS)
- Effective resolution: 23.5 bits (Gain = 1, 10SPS)
- RMS Noise: 17nV (Gain = 128, 10SPS)
- Common-mode rejection: 100 dB (fIN = 50 Hz or 60 Hz, VCM = 0.5V to AVDD-0.5V)
- Power-supply rejection: 90 dB (Gain = 1, ΔV = 0.1V, f = 50 Hz or 60 Hz)
- Input bias current: 10 nA (TA = 25°C)
- Supply current: 1.5 mA (AVDD = 5V, DVDD = 5V, 10SPS, Internal Clock)
- Internal oscillator accuracy: ±1% (TA = 25°C)
Features:
- Complete front-end for bridge sensors
- 19.2-bit noise-free resolution (Gain = 64)
- 23.5-bit effective resolution (Gain = 1)
- Low-noise PGA with 1, 2, 64, and 128 selectable gains
- 100dB simultaneous 50Hz and 60Hz rejection
- Flexible clock: low-drift internal oscillator or optional external crystal
- Selectable 10SPS or 80SPS data rates
- Simple ratiometric measurements with external voltage reference up to 5V
- Dual-channel differential input with internal temperature sensor (ADS1232)
- Quad-channel differential input (ADS1234)
- Two-wire serial interface
Applications:
- Weigh scales
- PLC weight modules
- Pressure sensors
Package:
- TSSOP-24 (ADS1232)
- TSSOP-28 (ADS1234)
Pin Configuration
Not to scale
图 5-2. ADS1234 PW Package, 28-Pin TSSOP, Top View
Electrical Characteristics
minimum and maximum specifications apply from TA = -40°C to +105°C; typical specifications are at T A = 25°C; all specifications are at AVDD = DVDD = V(REFP) = 5 V, V(REFN) = AGND, and fCLK = 4.9152 MHz (unless otherwise noted)
| PARAMETER | PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|---|
| ANALOG INPUTS | ANALOG INPUTS | ANALOG INPUTS | ANALOG INPUTS | ANALOG INPUTS | ANALOG INPUTS | ANALOG INPUTS |
| Differential input current | Gain = 1 | ±3 | nA | |||
| Differential input current | Gain = 2 | ±6 | nA | |||
| Differential input current | Gain = 64, 128 | ±3.5 | nA | |||
| SYSTEM PERFORMANCE | SYSTEM PERFORMANCE | SYSTEM PERFORMANCE | SYSTEM PERFORMANCE | SYSTEM PERFORMANCE | SYSTEM PERFORMANCE | SYSTEM PERFORMANCE |
| Resolution | No missing codes | 24 | Bits | |||
| f DATA | Data rate | Internal oscillator, SPEED = high | 78 | 80 | 82.4 | |
| f DATA | Data rate | Internal oscillator, SPEED = low | 9.75 | 10 | 10.3 | SPS |
| f DATA | Data rate | External oscillator, SPEED = high | f CLK | / 61,440 | SPS | |
| f DATA | Data rate | External oscillator, SPEED = low | f CLK / | 491,520 | SPS | |
| Digital filter settling time | Full settling, readings synchronized with A0, A1 pins | 4 | Conversions | |||
| INL | Integral nonlinearity | Differential input, end-point fit, gain = 1, 2 | - 0.001 | ±0.0002 | 0.001 | %of FSR (1) |
| INL | Integral nonlinearity | Differential input, end-point fit, gain = 64, 128 | ±0.0004 | |||
| Input offset error (2) | Gain = 1 | - 5 | ±0.2 | 5 | ppm of FS | |
| Input offset error (2) | Gain = 128 | - 1 | ±0.02 | 1 | ||
| Input offset drift | Gain = 1 | ±0.3 | μV/°C | |||
| Input offset drift | Gain = 128 | ±10 | nV/°C | |||
| Gain error (3) | Gain = 1 | - 0.02 | ±0.001 | 0.02 | % | |
| Gain = 128 | - 0.1 | ±0.01 | 0.1 | |||
| Gain drift | Gain = 1 | ±0.2 | ppm/°C | |||
| Gain drift | Gain = 128 | ±2.5 | ppm/°C | |||
| NMRR | Normal-mode rejection ratio (4) | Internal oscillator, f DATA = 10 SPS f IN = 50 Hz or 60 Hz, ±1 Hz | 100 | 110 | dB | |
| NMRR | Normal-mode rejection ratio (4) | External oscillator, f DATA = 10 SPS f IN = 50 Hz or 60 Hz, ±1 Hz | 120 | 130 | dB | |
| CMRR | Common-mode rejection ratio | At DC, gain = 1, Δ V = 1 V, V CM = AVDD / 2 | 95 | 110 | dB | |
| CMRR | Common-mode rejection ratio | At DC, gain = 128, Δ V = 0.1 V, V CM = AVDD / 2 | 95 | 110 | dB | |
| e n | Input-referred noise | See the Noise Performance section | See the Noise Performance section | See the Noise Performance section | ||
| PSRR | Power-supply rejection | AVDD, at DC, gain = 1, Δ V = 1 V | 85 | dB | ||
| PSRR | Power-supply rejection | AVDD, at DC, gain = 128, Δ V = 0.1 V | 100 | 120 | dB | |
| 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 = 1 mA | DVDD - 0.4 | V | ||
| V OL | Low-level output voltage | I OL = 1 mA | 0.2 DVDD | V | ||
| Input leakage current | 0 V < V IN < DVDD | - 10 | 10 | μA |
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 |
Recommended Operating Conditions
over operating ambient temperature range (unless otherwise noted)
| MIN | NOM | MAX | UNIT | |||
|---|---|---|---|---|---|---|
| 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 | ||||
| Full-scale input voltage | V (AINPx) - V (AINNx) | ±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 | ||||
| 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 | ||||
| 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 |
Thermal Information
| THERMAL METRIC (1) | THERMAL METRIC (1) | ADS1232 PW (TSSOP) 24 PINS | ADS1234 PW (TSSOP) 28 PINS | UNIT |
|---|---|---|---|---|
| R θ JA | Junction-to-ambient thermal resistance | 82.4 | 74.3 | °C/W |
| R θ JC(top) | Junction-to-case (top) thermal resistance | 25.5 | 21.9 | °C/W |
| R θ JB | 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 |
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.
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| ADS1232 | Texas Instruments | — |
| ADS1232IPWG4 | Texas Instruments | — |
| ADS1232IPWR | Texas Instruments | TSSOP-24 |
| ADS1234 | Texas Instruments | — |
| ADS123X | Texas Instruments | — |
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