DATA SHEET
ADS131E0x 4-, 6-, and 8-Channel, 24-Bit, Simultaneously-Sampling, Delta-Sigma ADC
1 Features
- Eight Differential ADC Inputs
- Outstanding Performance:
- Dynamic Range: 118 dB at 1 kSPS
- Crosstalk: –110 dB
- THD: –90 dB at 50 Hz and 60 Hz
- Analog Supply Range Options:
- Digital: 1.8 V to 3.6 V
- Low Power: 2 mW per Channel
- Data Rates: 1, 2, 4, 8, 16, 32, and 64 kSPS
- Programmable Gains: 1, 2, 4, 8, and 12
- Fault Detection and Device Testing Capability
- SPI™ Data Interface and Four GPIOs
- Package: TQFP-64 (PAG)
- Operating Temperature Range:
–40°C to +105°C
2 Applications
- Power Protection: Circuit Breakers, and Relay Protection
- Energy Metering: Single Phase, Polyphase, and Power Quality
- Battery Test Systems
- Test and Measurement
- Simultaneous Sampling Data Acquisition Systems
3 Description
The ADS131E0x are a family of multichannel, simultaneous sampling, 24-bit, delta-sigma (ΔΣ), analog-to-digital converters (ADCs) with a built-in programmable gain amplifier (PGA), internal reference, and an onboard oscillator. The ADC wide dynamic range, scalable data rates, and internal fault detect monitors make the ADS131E0x attractive in industrial power monitoring and protection as well as test and measurement applications. True high-impedance inputs enable the ADS131E0x to directly interface with a resistor-divider network or a voltage transformer to measure line voltage, or a current transformer or Rogowski coil to measure line current. With high integration levels and exceptional performance, the ADS131E0x family enables the creation of scalable industrial power systems at significantly reduced size, power, and low overall cost.
The ADS131E0x have a flexible input multiplexer per channel that can be independently connected to the internally-generated signals for test, temperature, and fault detection. Fault detection can be implemented internal to the device, using the integrated comparators with digital-to-analog converter (DAC)-controlled trigger levels. The ADS131E0x can operate at data rates as high as 64 kSPS.
These complete analog front-end (AFE) solutions are packaged in a TQFP-64 package and are specified over the industrial temperature range of –40°C to +105°C.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| ADS131E0x | TQFP (64) | 10.00 mm × 10.00 mm |
- For all available packages, see the orderable addendum at the end of the data sheet.
ADS131E08 Simplified Schematic
4 Revision History
Changes from B Revision (December 2013) to C Revision
- Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go
- Changed formatting of Thermal Information table note Go
Changes from A Revision (April 2013) to B Revision
- Deleted device graphicGo
- Changed ADS131E0x family description to 24-bits only throughout documentGo
- Added AVSS to DGND row to Absolute Maximum Ratings tableGo
- Changed minimum specification to External Reference, VREFP parameter in Electrical Characteristics tableGo
- Changed conditions in Figure 10Go
- Changed conditions in Figure 11Go
- Changed START Opcode to START in Figure 39Go
- Changed Reset (RESET) section for clarityGo
- Changed Power-Up Sequencing sectionGo
Changes from * Revision (June 2012) to A Revision
- Deleted AGND to DGND row from Absolute Maximum Ratings tableGo
- Changed value of Digital input to DVDD row in Absolute Maximum Ratings tableGo
- Added minimum and maximum specifications to External Reference, Reference input voltage parameter in Electrical Characteristics tableGo
- Added minimum and maximum specifications to External Reference, VREFP parameter in Electrical Characteristics tableGo
- Changed Channel Performance (AC Performance), Accuracy parameter in Electrical Characteristics tableGo
- Changed Internal Reference, VO parameter in Electrical Characteristics tableGo
- Changed Internal Reference, Temperature drift parameter in Electrical Characteristics tableGo
- Added Figure 15 Go
5 Device Comparison
| PRODUCT | NO. OF INPUTS | REFERENCE OPTIONS | RESOLUTION (Bits) | POWER-UP TIME (ms) |
|---|---|---|---|---|
| ADS130E08 | 8 | Internal, external | 16 | 128 |
| ADS131E04 | 4 | Internal, external | 24 | 128 |
| ADS131E06 | 6 | Internal, external | 24 | 128 |
| ADS131E08 | 8 | Internal, external | 24 | 128 |
| ADS131E08S | 8 | Internal only | 24 | 3 |
6 Pin Configuration and Functions
PAG Package
64-Pin TQFP
Top View
Pin Functions
| PIN | I/O | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| AVDD | 19, 21, 22, 56, 59 | Supply | Analog supply. Connect a 1-µF (or larger) capacitor to AVSS for each AVDD pin. |
| AVDD1 | 54 | Supply | Charge pump analog supply. Connect a 1-µF (or larger) capacitor to AVSS1. |
| AVSS | 20, 23, 32, 57, 58 | Supply | Analog ground |
| AVSS1 | 53 | Supply | Charge pump analog ground |
| CS | 39 | Digital input | Chip select; active low |
| CLK | 37 | Digital input | Master clock input. Connect to DGND if unused. |
| CLKSEL | 52 | Digital input | Master clock select |
| DAISY_IN | 41 | Digital input | Daisy-chain input. Connect to DGND if unused. |
| DGND | 33, 49, 51 | Supply | Digital ground |
| DIN | 34 | Digital input | Serial data input |
| DOUT | 43 | Digital output | Serial data output |
| DRDY | 47 | Digital output | Data ready; active low. Connect to DGND with a 10-kΩ resistor if unused. |
| DVDD | 48, 50 | Supply | Digital core power supply. Connect a 1-µF (or larger) capacitor to DGND for each DVDD pin. |
| GPIO1 | 42 | Digital input/output | General-purpose input/output pin 1. Connect to DGND with a 10-kΩ resistor if unused. |
| GPIO2 | 44 | Digital input/output | General-purpose input/output pin 2. Connect to DGND with a 10-kΩ resistor if unused. |
| GPIO3 | 45 | Digital input/output | General-purpose input/output pin 3. Connect to DGND with a 10-kΩ resistor if unused. |
| GPIO4 | 46 | Digital input/output | General-purpose input/output pin 4. Connect to DGND with a 10-kΩ resistor if unused. |
| IN1N(1) | 15 | Analog input | Negative analog input 1 |
| IN1P(1) | 16 | Analog input | Positive analog input 1 |
| IN2N(1) | 13 | Analog input | Negative analog input 2 |
| IN2P(1) | 14 | Analog input | Positive analog input 2 |
| IN3N(1) | 11 | Analog input | Negative analog input 3 |
| IN3P(1) | 12 | Analog input | Positive analog input 3 |
| IN4N(1) | 9 | Analog input | Negative analog input 4 |
| IN4P(1) | 10 | Analog input | Positive analog input 4 |
| IN5N(1) | 7 | Analog input | Negative analog input 5 (ADS131E06 and ADS131E08 only) |
| IN5P(1) | 8 | Analog input | Positive analog input 5 (ADS131E06 and ADS131E08 only) |
| IN6N(1) | 5 | Analog input | Negative analog input 6 (ADS131E06 and ADS131E08 only) |
| IN6P(1) | 6 | Analog input | Positive analog input 6 (ADS131E06 and ADS131E08 only) |
| IN7N(1) | 3 | Analog input | Negative analog input 7 (ADS131E08 only) |
| IN7P(1) | 4 | Analog input | Positive analog input 7 (ADS131E08 only) |
| IN8N(1) | 1 | Analog input | Negative analog input 8 (ADS131E08 only) |
| IN8P(1) | 2 | Analog input | Positive analog input 8 (ADS131E08 only) |
| NC | 27, 29, 62, 64 | — | No connection, leave floating. Can be connected to AVDD or AVSS with a 10-kΩ or higher resistor. |
| OPAMPN | 61 | Analog input | Op amp inverting input; leave floating if unused and power-down the op amp. |
| OPAMPP | 60 | Analog input | Op amp noninverting input; leave floating if unused and power-down the op amp. |
| OPAMPOUT | 63 | Analog output | Op amp output; leave floating if unused and power-down the op amp. |
| PWDN | 35 | Digital input | Power-down; active low |
| RESET | 36 | Digital input | System reset; active low |
| RESV1 | 31 | Digital input | Reserved for future use. Connect directly to DGND. |
| SCLK | 40 | Digital input | Serial clock input |
| START | 38 | Digital input | Start conversion |
| TESTN | 18 | Analog input/output | Test signal, negative pin. See the Unused Inputs and Outputs section for unused pins. |
| TESTP | 17 | Analog input/output | Test signal, positive pin. See the Unused Inputs and Outputs section for unused pins. |
| VCAP1 | 28 | Analog output | Analog bypass capacitor. Connect a 22-µF capacitor to AVSS. |
| VCAP2 | 30 | Analog output | Analog bypass capacitor. Connect a 1-µF capacitor to AVSS. |
| VCAP3 | 55 | Analog output | Analog bypass capacitor. Connect a parallel combination of 1-µF and 0.1-µF capacitors to AVSS. |
| VCAP4 | 26 | Analog output | Analog bypass capacitor. Connect a 1-µF capacitor to AVSS. |
| VREFN | 25 | Analog input | Negative reference voltage. Connect to AVSS |
| VREFP | 24 | Analog input/output | Positive reference voltage. Connect a minimum 10-µF capacitor to VREFN. |
(1) Connect any unused or powered-down analog input pins to AVDD.
