ADS131M08IRSNT
The ADS131M08IRSNT is an electronic component from Texas Instruments. View the full ADS131M08IRSNT datasheet below including key specifications, electrical characteristics, absolute maximum ratings.
Manufacturer
Texas Instruments
Category
Integrated CircuitsKey Specifications
| Parameter | Value |
|---|---|
| Packaging | MouseReel |
| Standard Pack Qty | 250 |
Overview
Part: ADS131M08 — Texas Instruments
Type: 8-Channel, Simultaneously-Sampling, 24-Bit, Delta-Sigma ADC
Description: An 8-channel, simultaneously-sampling, 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) offering wide dynamic range, low power, and energy-measurement-specific features, with programmable gain up to 128 and data rates up to 32 kSPS.
Operating Conditions:
- Supply voltage: 2.7 V to 3.6 V (analog and digital supplies)
- Operating temperature: -40°C to +125°C
- Data rate: up to 32 kSPS
- Programmable gain: 1 to 128
Absolute Maximum Ratings:
Key Specs:
- Dynamic range: -102 dB at gain = 1, 4 kSPS
- Dynamic range: -80 dB at gain = 64, 4 kSPS
- Total harmonic distortion: -100 dB
- Input impedance (gains 1, 2, 4): 330 kΩ
- Input impedance (gains 8, 16, 32, 64, 128): ≥ 1 MΩ
- Channel-to-channel crosstalk: -120 dB
- Power consumption: 6.0 mW at 3-V AVDD and DVDD
- Fast startup: first data within 0.5 ms of supply ramp
Features:
- 8 simultaneously sampling differential inputs
- Programmable channel-to-channel phase delay calibration (244-ns resolution, 8.192-MHz fCLKIN)
- Current-detect mode for extremely low power tamper detection
- Integrated negative charge pump allows input signals below ground
- Low-drift internal voltage reference
- Cyclic redundancy check (CRC) on communications and register map
Applications:
- Electricity meters: commercial and residential
- Circuit breakers
- Protection relays
- Power quality meters
- Battery test equipment
- Battery management systems
Package:
- TQFP (32-pin, 5.00 mm × 5.00 mm)
- WQFN (32-pin, 4.00 mm × 4.00 mm)
Features
- 8 simultaneously sampling differential inputs
- Programmable data rate up to 32 kSPS
- Programmable gain up to 128
- Noise performance:
- -102-dB dynamic range at gain = 1, 4 kSPS
- -80-dB dynamic range at gain = 64, 4 kSPS
- Total harmonic distortion: -100 dB
- High-impedance inputs for direct sensor connection:
- -Input impedance 330-kΩ for gains of 1, 2, and 4
- -Input impedance ≥ 1-MΩ for gains of 8, 16, 32, 64, and 128
- Programmable channel-to-channel phase delay calibration:
- -244-ns resolution, 8.192-MHz fCLKIN
- Current-detect mode allows for extremely low power tamper detection
- Fast startup: first data within 0.5 ms of supply ramp
- Integrated negative charge pump allows input signals below ground
- Crosstalk between channels: -120 dB
- Low-drift internal voltage reference
- Cyclic redundancy check (CRC) on communications and register map
- 2.7-V to 3.6-V analog and digital supplies
- Low power consumption: 6.0 mW at 3-V AVDD and DVDD
- Packages: 32-pin TQFP or 32-pin WQFN
- Operating temperature range: -40°C to +125°C
Applications
Pin Configuration
Figure 5-1. PBS Package, 32-Pin TQFP, Top View
Figure 5-1. PBS Package, 32-Pin TQFP, Top View
Figure 5-2. RSN Package, 32-Pin WQFN, Top View
| PIN | PIN | PIN |
|---|---|---|
| NAME | NO. | NO. |
| NAME | WQFN | TQFP |
| AGND | 13, 28 | 13, 28 |
| AIN0N | 30 | 30 |
| AIN0P | 29 | 29 |
| AIN1N | 31 | 31 |
| AIN1P | 32 | 32 |
| AIN2N | 2 | 2 |
| AIN2P | 1 | 1 |
| AIN3N | 3 | 3 |
| AIN3P | 4 | 4 |
| AIN4N | 6 | 6 |
| AIN4P | 5 | 5 |
| AIN5N | 7 | 7 |
| AIN5P | 8 | 8 |
| AIN6N | 10 | 10 |
| AIN6P | 9 | 9 |
| AIN7N | 11 | 11 |
| AIN7P | 12 | 12 |
| AVDD | 15 | 15 |
| CAP | 24 | 24 |
| CS | 17 | 17 |
| DGND | 25 | 25 |
| DIN | 21 | 21 |
| DOUT | 20 | 20 |
| DRDY | 18 | 18 |
| DVDD | 26 | 26 |
| NC | 27 | 27 |
| REFIN | 14 | 14 |
| SCLK | 19 | 19 |
| SYNC/RESET | 16 | 16 |
| XTAL1/CLKIN | 23 | 23 |
| XTAL2 | 22 | 22 |
| Thermal pad | - |
Electrical Characteristics
minimum and maximum specifications apply from TA = -40°C to +125°C; typical specifications are at TA = 25°C; all specifications are at AVDD = 3 V, DVDD = 3 V, fCLKIN = 8.192 MHz, data rate = 4 kSPS, gain = 1, all channels enabled, global-chop mode disabled, using internal reference with 100-nF tied to REFIN pin, and internal oscillator disabled (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 |
| Z in | Differential input impedance | Gain = 1, 2, or 4 | 330 | kΩ | ||
| I b | Input bias current | Gain = 8, 16, 32, 64, or 128, inputs shorted to ground | ±1 | μA/V | ||
| ADC CHARACTERISTICS | ADC CHARACTERISTICS Resolution Gain settings | ADC CHARACTERISTICS | ADC CHARACTERISTICS 24 1, 2, 4, 8, 16, 32, 64, 128 | ADC CHARACTERISTICS | ADC CHARACTERISTICS | ADC CHARACTERISTICS Bits |
| f DATA | Data rate | High-resolution mode, f CLKIN = 8.192 MHz | 250 | 32k | SPS | |
| f DATA | Data rate | Low-power mode, f CLKIN = 4.096 MHz | 125 | 16k | SPS | |
| f DATA | Data rate | Very low-power mode, f CLKIN = 2.048 MHz | 62.5 | 8k | ||
| Startup time | Measured from supplies at 90% to first DRDY falling edge | 0.5 | ms | |||
| ADC PERFORMANCE | ADC PERFORMANCE | ADC PERFORMANCE | ADC PERFORMANCE | ADC PERFORMANCE | ADC PERFORMANCE | ADC PERFORMANCE |
| INL | Integral nonlinearity (best fit) | 7.5 | ppm of FSR | |||
| Offset error (input referred) Offset drift Gain error Gain drift | Global-chop mode Global-chop mode Excluding voltage reference error, gain = 1 | ±240 ±32 215 105 ±0.3% 5 | μV nV/°C | |||
| Gain drift | Including internal voltage reference error, gain = 1 | 10 | 20 | ppm/°C | ||
| Long-term gain drift | 1000 hours at 85°C, including internal voltage reference error, TQFP package | 385 | ppm | |||
| Long-term gain drift | 1000 hours at 85°C, including internal voltage reference error, WQFN package | 90 | ppm | |||
| CMRR | Common-mode rejection ratio | At dc | 100 | dB | ||
| CMRR | Common-mode rejection ratio | Hz | 94 | dB | ||
| PSRR | Power-supply rejection ratio | dB | ||||
| PSRR | Power-supply rejection ratio | f CM = 50 Hz or 60 AVDD at DC DVDD at DC AVDD supply, f PS = 50 Hz or 60 Hz | 100 80 78 | dB | ||
| Input referred noise | DVDD supply, f PS = 50 Hz or 60 Hz | 90 5.4 | μV RMS | |||
| Input referred noise | During fast startup | 1500 | μV RMS | |||
| Dynamic range | Gain = 1 | 99 | 102 | dB | ||
| Dynamic range | Gain = 64 | 80 | dB | |||
| Crosstalk | f IN = 50 Hz or 60 Hz | See | -120 | dB |
Absolute Maximum Ratings
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| Power-supply voltage | AVDD to AGND | -0.3 | 3.9 | V |
| Power-supply voltage | AGND to DGND | -0.3 | 0.3 | V |
| Power-supply voltage | DVDD to DGND | -0.3 | 3.9 | V |
| Power-supply voltage | DVDD to DGND, CAP tied to DVDD | -0.3 | 2.2 | V |
| Power-supply voltage | CAP to DGND | -0.3 | 2.2 | V |
| Analog input voltage | AINxP, AINxN | AGND - 1.6 | AVDD + 0.3 | V |
| Reference input voltage | REFIN | AGND - 0.3 | AVDD + 0.3 | V |
| Digital input voltage | CS, XTAL1/CLKIN, DIN, SCLK, SYNC/RESET, XTAL2 | DGND - 0.3 | DVDD + 0.3 | V |
| Input current | Continuous, all pins except power-supply pins | -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 | POWER SUPPLY | POWER SUPPLY | POWER SUPPLY | POWER SUPPLY |
| Analog power supply | AVDD to AGND, normal operating modes | 2.7 | 3.0 | 3.6 | V | |
| AVDD to AGND, standby and current-detect modes | 2.4 | 3.0 | 3.6 | V | ||
| AGND to DGND | -0.3 | 0 | 0.3 | V | ||
| Digital power supply | DVDD to DGND | 2.7 | 3.0 | 3.6 | V | |
| DVDD to DGND, DVDD shorted to CAP (digital LDO bypassed) | 1.65 | 1.8 | 2 | V | ||
| ANALOG INPUTS (1) | ANALOG INPUTS (1) | ANALOG INPUTS (1) | ANALOG INPUTS (1) | ANALOG INPUTS (1) | ANALOG INPUTS (1) | ANALOG INPUTS (1) |
| V AINxP , | Absolute input voltage | Gain = 1, 2, or 4 | AGND - 1.3 | AVDD | V | |
| V AINxN | Gains = 8, 16, 32, 64 or 128 | AGND - 1.3 | AVDD - 1.8 | V | ||
| V IN | Differential input voltage | Using internal reference, V IN = V AINxP - V AINxN | -V REF / Gain | V REF / Gain | V | |
| V IN | Differential input voltage | Using external reference, V IN = V AINxP - V AINxN | - 0.96 × V REF / Gain | 0.96 × V REF / Gain | V | |
| VOLTAGE REFERENCE INPUT | VOLTAGE REFERENCE INPUT | VOLTAGE REFERENCE INPUT | VOLTAGE REFERENCE INPUT | VOLTAGE REFERENCE INPUT | VOLTAGE REFERENCE INPUT | VOLTAGE REFERENCE INPUT |
| V REFIN | Reference input voltage | 1.1 | 1.25 | 1.3 | V | |
| EXTERNAL CLOCK SOURCE | EXTERNAL CLOCK SOURCE | EXTERNAL CLOCK SOURCE | EXTERNAL CLOCK SOURCE | EXTERNAL CLOCK SOURCE | EXTERNAL CLOCK SOURCE | EXTERNAL CLOCK SOURCE |
| f CLKIN | External clock frequency | High-resolution mode, Gain = 1 or 2 | 0.3 | 8.192 | 8.4 | MHz |
| f CLKIN | External clock frequency | High-resolution mode, Gain > 2 | 0.3 | 8.192 | 8.2 | MHz |
| f CLKIN | External clock frequency | Low-power mode | 0.3 | 4.096 | 4.15 | MHz |
| f CLKIN | Very-low-power mode | 0.3 | 2.048 | 2.08 | MHz | |
| Duty cycle | Duty cycle | 40 | 50 | 60 | % | |
| DIGITAL INPUTS | DIGITAL INPUTS | DIGITAL INPUTS | DIGITAL INPUTS | DIGITAL INPUTS | DIGITAL INPUTS | DIGITAL INPUTS |
| Input voltage | Input voltage | DGND | DVDD | V | ||
| TEMPERATURE RANGE | TEMPERATURE RANGE | TEMPERATURE RANGE | TEMPERATURE RANGE | TEMPERATURE RANGE | TEMPERATURE RANGE | TEMPERATURE RANGE |
| T A | Operating ambient temperature | Operating ambient temperature | -40 | 125 | °C |
Thermal Information
| ADS131M08 | ADS131M08 | ||
|---|---|---|---|
| THERMAL METRIC (1) | THERMAL METRIC (1) | RSN (WQFN) | PBS (TQFP) |
| 32 PINS | 32 PINS | ||
| R θJA | Junction-to-ambient thermal resistance | 33.7 | 81.9 |
| R θJC(top) | Junction-to-case (top) thermal resistance | 26.5 | 26.0 |
| R θJB | Junction-to-board thermal resistance | 13.4 | 32.7 |
| Ψ JT | Junction-to-top characterization parameter | 0.3 | 1.1 |
| Ψ JB | Junction-to-board characterization parameter | 13.4 | 32.5 |
| R θJC(bot) | Junction-to-case (bottom) thermal resistance | 4.1 | N/A |
Typical Application
This section describes a class 0.1 three-phase energy measurement front-end using the ADS131M08. The ADC samples the outputs of the CTs and voltage dividers to measure the current and voltage (respectively) of each leg of the AC mains. The design can achieve high accuracy across a wide input current range (0.05 A - 100 A) and supports high sampling frequencies necessary for advanced power quality features such as individual harmonic analysis. Using the ADS131M08 to sample the CT output provides designers greater flexibility in the choice of metrology microcontrollers when compared to an integrated system-on-a-chip (SoC) and dedicated application-specific products.
Figure 9-5 shows the front-end for the three-phase energy measurement design.
Figure 9-5. Three-Phase Metrology Design Front-End
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| ADS131M08 | Texas Instruments | — |
| ADS131M08-Q1 | Texas Instruments | — |
| ADS131M08IPBS | Texas Instruments | TQFP-32(5x5) |
| ADS131M08IPBS.A | Texas Instruments | — |
| ADS131M08IPBSR | Texas Instruments | 32-TQFP |
| ADS131M08IPBSR.A | Texas Instruments | — |
| ADS131M08IRSNR | Texas Instruments | QFN-32(4x4) |
| ADS131M08IRSNR.A | Texas Instruments | — |
| ADS131M08IRSNT.A | Texas Instruments | — |
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