Texas Instruments ADS131M04 Handleiding

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ADS131M04 4-Channel, Simultaneously-Sampling, 24-Bit, Delta-Sigma ADC

1 Features

•4 simultaneously sampling differential inputs

•Programmable data rate up to 64 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 f

CLKIN

•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: 3.3 mW at 3-V AVDD

and DVDD

•Packages: 20-pin TSSOP or 20-pin WQFN

•Operating temperature range: –40°C to +125°C

2 Applications

•Electricity meters: commercial and residential

•Circuit breakers

•Protection relays

•Power quality meters

•Battery test equipment

•Battery management systems

3 Description

The ADS131M04 is a four-channel, simultaneously-

sampling, 24-bit, delta-sigma (ΔΣ), analog-to-digital

converter (ADC) that offers wide dynamic range, low

power, and energy-measurement-specific features,

making the device an excellent fit for energy metering,

power metrology, and circuit breaker applications. The

ADC inputs can be directly interfaced to a resistor-

divider network or a power transformer to measure

voltage or to a current transformer, shunt, or a

Rogowski coil to measure current.

The individual ADC channels can be independently

configured depending on the sensor input. A low-

noise, programmable gain amplifier (PGA) provides

gains ranging from 1 to 128 to amplify low-level

signals. Additionally, this device integrates channel-

to-channel phase calibration and offset and gain

calibration registers to help remove signal-chain

errors.

A low-drift, 1.2-V reference is integrated into the

device reducing printed circuit board (PCB) area.

Optional cyclic redundancy checks (CRCs) on the

data input, data output, and register map maintain

communication integrity.

The complete analog front-end (AFE) is offered

in a 20-pin TSSOP package or a leadless 20-pin

WQFN package and is specified over the industrial

temperature range of –40°C to +125°C.

Device Information

(1)

PART NUMBERPACKAGEBODY SIZE (NOM)

ADS131M04

TSSOP (20)6.50 mm × 4.40 mm

WQFN (20)3.00 mm × 3.00 mm

(1)For all available packages, see the orderable addendum at

the end of the data sheet.

'6ADC

SCLK

DOUT

DIN

Control &

Serial Interface

CS

Gain & Offset

Calibration

AVDD

AGND

DVDD

DGND

DRDY

Clock

Generation

CLKIN

1.2-V

Reference

SYNC / RESET

Phase Shift &

Digital Filters

'6ADC

Gain & Offset

Calibration

Phase Shift &

Digital Filters

'6ADC

Gain & Offset

Calibration

Phase Shift &

Digital Filters

'6ADC

Gain & Offset

Calibration

Phase Shift &

Digital Filters

AIN0P

AIN0N

+

±

AIN1P

AIN1N

+

±

AIN2P

AIN2N

+

±

AIN3P

AIN3N

+

±

Simplified Block Diagram

ADS131M04

SBAS890D – MARCH 2019 – REVISED MAY 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Product specificaties