Texas Instruments ADS125H02 Manuel utilisateur

1-of-4

Decoder

5 V5 V

PGA 24-Bit

ûADC

AINCOM

MUX

AIN0

AIN1

ADS125H02

AVDD DVDD

DGND

VIN = ± 10V

BUF

2.5-V

REF

REF MUX

REFP0 REFP1

Temp

Sensor

Supply

Read

1 nF

10 nF

1 k

MUX509

VSS

-15 V

0.1 F

S1A

S1B

S2A

S2B

S3A

S3B

S4A

S4B

GPIO1

GPIO0

GPIO2

GPIO

CAPP CAPN

AGND

1 nF C0G

GND

VDD

15 V

0.1 F

HV_AVSS

-15 V

0.1 F

HV_AVDD

15 V

0.1 F

1 F

TVS3300TVS3300

0110: 4

0111: 8

1000: 16

1001: 32

1010: 64

1011: 128

0000: 0.125

0001: 0.1875

0010: 0.25

0011: 0.5

0100: 1

0101: 2

PGA Gain Options

Reg. MODE4 - GAIN[3:0]

1 F

REFOUT

1 F10 F

BYPASS

1 F

210

1 nF

10 nF

1 k

210

1 nF

10 nF

1 k

210

1 nF

10 nF

1 k

210

Optional

TVS Protection Input Filter

VIN = ± 10V

IIN = 0 to 20 mA

(V = 0 to 5V)

IIN = 0 to 20 mA

(V = 0 to 5V)

250250

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Four-channel, differential input, DAQ front-end circuit with configurable

voltage and current inputs

Analog Engineer's Circuit: Data

Converters

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Four-channel, differential input, DAQ front-end circuit with

configurable voltage and current inputs

VictorSalomon

Feature Value Units

Number of channels 4 Differential channels

Data rate ≤10 kSPS

Voltage input range ±10.0 Volts

Current input range 0 to 20 mA

Voltage accuracy 0.05 typical | 0.10 maximum %FS

Current accuracy 0.10 typical | 0.20 maximum %FS

Power Supplies

AVDD HV-AVDD HV-AVSS

5.0V 15.0V –15.0V

Design Description

This circuit design describes how to use an ADS125H02 with integrated reference and programmable gain

amplifier (PGA) to make voltage and current measurements on various ranges.

This circuit can be used in applications such as analog input modules for PLCs, avionics remote data

concentrators,lab and field instrumentation, and other factory automation and test and measurement

applications. Thermocouples and RTD are also common temperature sensors used in similar applications.

For more information about making precision ADC measurements with a variety of RTD wiring

configurations, see the A Basic Guide to Thermocouple Measurements Application Report.

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Design Notes

1. Use supply decoupling capacitors for both the analog and digital supplies. For the high-voltage analog

supply (HV_AVDD and HV_AVSS), place a 1.0-µF capacitor between the pins and place 0.1-µF

capacitors from each supply to the ground plane. Connect 0.1-µF and 10-µF capacitors in parallel at

AVDD to the ground plane. Connect a 1.0-µF capacitor from DVDD to the ground plane. Connect a

1.0-µF capacitor from BYPASS to the ground plane. For details on power supply recommendations,

see the ADS125H02 ±20-V Input, 2-Channel, 40- kSPS, 24-Bit, Delta-Sigma ADC With PGA and

Voltage Reference Data Sheet.

2. To minimize input current leakage, connect unused analog inputs to AGND when operating the device

with bipolar supplies, or connect unused inputs to AVDD when operating the device with a unipolar

supply.

3. Program unused GPIOs as outputs (default setting). If any GPIOs are programmed as inputs, the

GPIO must not be allowed to float (unconnected), otherwise AVDD power-supply leakage current may

result.

4. Consider adding TVS diodes between the high-voltage supplies (HV_AVDD to HV_AVSS) to provide

overvoltage protection and avoid violating the absolute maximum rating of 38V. A TVS diode such as

the TVS3300 provides a 33.0-V stand-off voltage (VR), which is below the 30.0-V supply required,

minimizing the current leakage of the diode, but has a typical break-down voltage (VBR) and clamping

voltage (VC) of 35.8 V and 38.0 V, respectively (assuming a peak pulse current IPP of 35.0 A),

effectively protecting the ADC from an EOS event. For more details on EOS in ADCs, see TI Precision

Labs: EOS and ESD in ADC.

5. When possible, use C0G (NPO) ceramic capacitors for input filtering. The dielectric used in these

capacitors provides the most stable electrical properties over voltage, frequency, and temperature

changes.

6. Input filtering for the ADC inputs and the reference inputs are selected using standard capacitor values

and 1% resistor values. For an example design and analysis of these filters, see the RTD Ratiometric

Measurements and Filtering Using the ADS1148 and ADS1248 Family of Devices Application Report.

Component Selection

1. Identify the system components:

a. Given the following specifications are:

• Input voltage range ≤±12.0V

• Two voltage input channels, and two current input channels

• Data rate ≤10 kSPS

• 0.05%FS accuracy, or better

• Optimized for cost

b. Products selected:

•ADS125H02 is a 24-bit, ±20-V input, delta-sigma ADC with integrated high-input voltage PGA

and voltage reference. This device meets the input voltage range, accuracy, and data rate

requirements, and it integrates a precision voltage reference, and GPIOs helping in cost

optimization.

•MUX509 is a differential 4:1, 36-V, precision, analog multiplexer. This device enables

expanding to 4-channels using a single ADC for cost optimization.

• Burden resistor:

A burden resistor converts the current to a limited voltage to do measurements in the current

measurement mode, a 250-Ωresistor was selected given the desired current range

measurements (0 to 20mA), and a target burden voltage of 5.0V. Using a precision resistor

ensures that the resistor does not become the limiting factor for system accuracy, the following

specifications can be used as :

– Accuracy ≤0.1%

– Temperature coefficient ≤20 ppm/°C

– Power rating ≥0.5W

• Alternative and similar devices are listed in Design Featured Devices.

±±

= = =

IN _ FSR

Voltage

REF

IN _ FSR

Current

REF

V10V

Gain 0.25V / V

V 2.5V

V5.0V

Gain 0.50V / V

V 2.5V

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Four-channel, differential input, DAQ front-end circuit with configurable

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2. Perform error analysis calculations:

A key consideration in the design of an analog input module is the error over the ambient temperature

range resulting from the drift of gain, offset, reference voltage, and linearity error. This example shows

the results of a Total Unadjusted Error (TUE) analysis that assumes an FS voltage of 10V, and that the

initial offset and gain (including reference voltage error) are user calibrated at TA= 25°C, as well as

calibration overtemperature. The following table shows the maximum error, including the drift error of

the ADC over the –20°C to 70°C temperature range, before calibration, and after calibration at room

temperature, as well as overtemperature.

Maximum Error Before and After Calibration

Specification Data Sheet Value Error (ppm)

Including ΔT = 90°C

Error (ppm)

Assuming Gain and Offset Calibration

Internal VREF initial accuracy (maximum) 0.20% 2000.000 1.325

Internal VREF temperature drift (maximum) 1 ppm/°C 90.000 90.000

Internal VREF temperature hysteresis (70

ppm/105°C) 60 ppm/°C 60.000 60.000

Quantization noise 172.3nVRMS 0.017 0.017

Noise 53μVRMS 5.300 5.300

INL 0.001% 10.000 10.000

Offset 2500μV 250.000 1.325

Offset temperature drift 2000nV/°C 18.000 18.000

Gain error 0.70% 7000.000 1.325

Gain error temperature drift 4 ppm/°C 360.000 360.000

Total error (root sum of squares) [ppm] 7294.124 376.507

Total error (root sum of squares) [%FS] 0.729 0.038

3. Inspecting the data in Maximum Error Before and After Calibration, it is evident that the main

contributors to the system total error calculations before any calibration is performed are the initial

accuracy of the internal voltage reference, the gain error overtemperature, and the offset voltage,

resulting in a total error of 0.729%FS. Assuming gain and offset calibration is performed, reducing the

gain, offset, the initial accuracy of the reference to levels in the noise, resulting in the error similar to

the ADC noise level, 1.325 ppm (assuming average of 16 samples), then the total error can be

calculated to be reduced to 0.038%FS. Calibration overtemperature could be performed to improve the

full scale accuracy even further.

4. Calculating PGA gain required:

The PGA gain required is determined by the reference voltage and the input voltage range, which is:

±10V for the voltage measurements and 5.0V for the current measurements, assuming a burden

resistor of 250Ω.

HV_AVSS

HV_AVDD ±2.5 V

HV_AVSS + 2.5 V

VINP

VINN

VINP

VIN = VINP - VINN

PGA Input PGA First Stage Output

HV_AVDD

PGA Second Stage Output

AVDD

AVDD ±0.5 V

AGND

AGND + 0.5 V

VINN

AVDD/2 + VIN Â*DLQ/ 2

AVDD/2 - VIN Â*DLQ/ 2

AVDD/2

´ - ´ -

+ + < < - -

AINx

IN IN

V (Gain 1) V (Gain 1)

HV _ AVSS 2.5 HV _ AVDD 2.5

2 2

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5. Verify PGA input limitations:

As in typical amplifiers the integrated PGA has a maximum allowable input voltage (VAINX), which can

be found in the recommended operating conditions table in the ADS125H02 data sheet, and it is

determined by the PGA gain, the maximum differential input voltage (VIN), and the minimum value of

the high-voltage power supply. Maintain the absolute input voltage (VAINX) within the range as shown in

the following equation; otherwise, an incorrect conversion data can result:

where

• For gain < 1, use value = 1 for gain

• V(AINx) = Input voltage

• VIN = VAINP – VAINN = Maximum expected differential input voltage

In both the voltage and current measurements, since the gain < 1, the absolute input voltage must be:

–12.5V < VAINX < 12.5V

The following image shows the relationship between the PGA input voltage to the PGA output voltage

in attenuation mode. The first PGA stage is configured as a unity-gain follower, the second PGA stage

attenuates the differential input and shifts the signal common-mode voltage to AVDD / 2 to drive the

ADC input.

6. GPIO configuration:

The ADS125H02 device provides four GPIO pins (GPIO0–GPIO4), two GPIOs are available on

dedicated pins and two GPIOs are multiplexed functions with an external reference (REFP1 and

REFN1). The GPIO input and output levels are referred to AVDD and AGND, so in this case the logic

output levels are set to 5.0V. The following bits in registers 3 and 4 are used to control the GPIOs:

• GPIO_CON[3:0] bits set the GPIO connection to the designated pin (1 = connected)

• GPIO_DIR[3:0] bits program the direction of the GPIO as an input (1) or output (0)

• GPIO_DAT[3:0] bits are the data values for the GPIO

In this case, set GPIO_CON[3:0] to '0111', and set GPIO_DIR[3:0] to '1000', while the configuration for

GPIO_DAT[3:0] will be dependant upon which channel is connected at any given time. The MUX509

Truth Table and GPIO_DAT Configuration table shows the configuration of the individual GPIO[x] bits

depending on the input channel selected.

MUX509 Truth Table and GPIO_DAT Configuration

EN | GPIO2 A1 | GPIO1 A0 | GPIO0 State

0 1 1 MUX disabled

1 0 0 Channel 1 ON (Voltage)

1 0 1 Channel 2 ON (Voltage)

1 1 0 Channel 3 ON (Current)

1 1 1 Channel 4 ON (Current)

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Four-channel, differential input, DAQ front-end circuit with configurable

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7. Digital filter selection:

Digital low-pass filters are essential to the functionality of a delta-sigma ADC, which relies on

oversampling and noise shaping to push quantization noise out of band. There are a variety of options

for digital filters available in the ADS125H02 device. When choosing a digital filter, consider the

following tradeoffs:

• Slower data rates (higher oversampling ratios) have lower noise bandwidth. They are great for

noise, but not for data throughput or detection of transient events.

• The built-in PGA monitors are able to assist in detecting transient events that may affect the

conversion results; therefore, the digital filter is generally able to be run at a slower data rate for

better noise performance.

• Higher-order SINC filters have slower settlings times when an input step is applied, but they provide

lower noise bandwidth and increased notch width for removing common noise signals, such as

power line noise which in practice may not occur at exactly 50Hz or 60Hz.

• Digital filter notches occur at intervals of the SINCx filter data rate, so data rates of 50 SPS, 60 SPS

or less are recommended for attenuating power line noise.

• The 20 SPS FIR filter is unique from the SINCx filters in that it provides simultaneous rejection of

50- and 60-Hz noise and also settles within a single conversion cycle (like the SINC1 filter).

In this application, TI recommends a low-latency 20 SPS using a SINC1 filter, which is shown in the

pseudocode example in the following section.

For more information about digital filters in the ADS125H02 device, see the following:

• The Digital Filter section of the ADS125H02 Data Sheet

•Digital Filter Types in Delta-Sigma ADCs Application Report

Configuration Register Settings for Voltage and Current Inputs

Address Register

Name Field Register Value Description

05h MODE3 GPIO_DAT[3:0] See MUX509 Truth Table and

GPIO_DAT Configuration GPIO state (to control the external MUX)

MODE2 GPIO_DIR[3:0] 1000 GPIO[2:0] outputs, GPIO[3] input

MODE4 GPIO_CON[3:0] 0111 GPI0[2:0] connected GPIO[3] disconnected

10h MODE4 MUX[2:0] 000 Internal MUX

10h MODE4 GAIN[3:0] 0010 or 0011 PGA - Gains for voltage and current

measurements, respectively

02h MODE0 DR[4:0] 00100 Data rate: 20 SPS

02h MODE0 FILTER[2:0] 000 Digital filter: SINC1

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Pseudocode Example

The following pseudocode sequence shows the required steps to set up the device and the microcontroller

that interfaces to the ADC to take subsequent readings from the ADS125H0x device for both voltage and

current measurements. The dedicated DRDY pin indicates the availability of new conversion data.

Pseudocode is shown without the use of the STATUS byte and CRC data verification. Download the

ADS125H02 Example C Code from the ADS125H02 product folder or access it directly with the following

link: ADS125H02 Example C Code.

Generic Pseudocode

Init:

{Configure microcontroller for SPI master, mode 1 (CPOL = 0, CPHA = 1), SCLK freq = 8 MHz

Configure microcontroller GPIO for /DRDY as a falling edge triggered interrupt input

Set CS1 low;

Send 06h 00h A9h 00h; // RESET command to ensure proper reset after power-up

Set CS1 high;

// DELAY

Set CS1 low;

Send 46h 10h 82h 00h; // WREG to REF: Enable and select the internal 2.5V reference

Set CS1 high;

// NOTE: not necessary to issue a WREG to MODE0 command when using the default register values

Set CS1 low;

Send 42h 24h 5Ah 00h; // WREG to MODE0: Continuous conversion, low-latency filter, 20 SPS

Set CS1 high;

Set CS1 low;

Send 43h 08h 8Bh 00h; // WREG to MODE1: Continuous conversion, 605us conv. start delay

Set CS1 high;

Set CS1 low;

Send 44h 77h 9Ah 00h; // WREG to MODE2: Enable GPIO outputs on GPIO0, GPIO1, and GPIO2

Set CS1 high;

Set channelNumber = 1

Call Gain_Select()

Call Channel_Select()

// (OPTIONAL): For verification read back all register settings

Call Start_New_Conversion()

}

Loop:

{Wait for DRDY falling edge interrupt...

Do you want to switch to the next channel?

{channelNumber = (channelNumber + 1) % 4;

Call Gain_Select()

Call Channel_Select()

Call Start_New_Conversion()

}

Call Read_Data()

}

Channel_Select()

{// NOTE:

// A0, A0 and EN are controlled by GPIO0, GPIO1 and GPIO2 respectively

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Four-channel, differential input, DAQ front-end circuit with configurable

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// STATUS0 byte is always enabled

Set CS1 low;

// WREG to MODE3 register to set GPIO pin levels

If (channelNumber == 1)

Send 45h 44h 16h 00h; // EN=1; A1=A0=0

ElseIf (channelNumber == 2)

Send 45h 45h 11h 00h; // EN=1; A1=0; A0=1

ElseIf (channelNumber == 3)

Send 45h 46h 18h 00h; // EN=1; A1=1; A0=0

ElseIf (channelNumber == 4)

Send 45h 47h 1Fh 00h; // EN=1; A1=A0=1

Set CS1 high;

}

Gain_Select()

{// NOTE:

// Using gain of 0.25 V/V for channels 1 & 2

// Using gain of 0.50 V/V for channels 3 & 4

// Always select AINP = AIN1 and AINN = AIN0 for analog inputs

Set CS2 low;

// WREG to MODE4 register to configure PGA gain

If (channelNumber <= 2)

Send 50h 02h D5h 00h; // Gain = 0.25 V/V

ElseSend 50h 03h D2h 00h; // Gain = 0.50 V/V

Set CS2 high;

}

Start_New_Conversion()

{Set CS1 low;

Send 08h 00h 7Fh 00h; // START command

Set CS1 high;

}

Read_Data()

{Set CS1 low;

Send 12h 00h AAh 00h 00h 00h 00h 00h 00h;

Receive FFh 12h 00h AAh [STATUS] [MSB] [MID] [LSB] [CRC]

Set CS1 high;

// Cast, concatenate, and sign-extend 24-bit data to signed 32-bit datatype

signedValue = (((int32_t) [MSB] << 24) + ((int32_t) [MID] << 16) + ((int32_t) [LSB] << 8)) >>

// Convert ADC value to voltage (LSBsize = 2*VREF/GAIN)

// NOTE:

// Using gain of 0.25 V/V for channels 1 & 2

// Using gain of 0.50 V/V for channels 3 & 4

VoltageReading = (LSBsize * signedValue);

If (channelNumber > 2)

CurrentReading = (VoltageReading / BurdenResistance);

}

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Design Featured Devices

Device Key Features Link Other Possible Devices

Analog to Digital Converter (ADC) with Integrated PGA and Voltage Reference

ADS125H02 24-bit, 40-kSPS, 2-channel delta-sigma ADC with ±20-V input, PGA, IDACs, GPIOs, and VREF ti.com/product/ADS125H02 Link to similar devices

ADS125H01 24-bit, 40-kSPS, 1-channel delta-sigma ADC with ±20-mV to ±20-V input ti.com/product/ADS125H01

Programmable Gain Amplifier (PGA)

PGA280 4-channel, zero-drift, high voltage, programmable gain amplifier (PGA) ti.com/product/PGA280 Link to similar devices

PGA281 1-channel, zero-drift, high voltage, programmable gain amplifier (PGA) ti.com/product/PGA281

Analog Multiplexer

MUX509 Differential or dual 4:1, 36.0-V, precision analog multiplexer x`ti.com/product/MUX509

Link to similar devices

MUX36D04 Differential or dual 4:1, 36.0-V, precision analog multiplexer

Lower leakage current

ti.com/product/MUX36D04

TMUX6104 Single-ended 4:1, ±16.5-V, precision analog multiplexer

Lowest leakage current, lowest on-capacitance

ti.com/product/TMUX6104

CD4052 Differential or dual 4:1, ±10.0-V analog multiplexer

Lowest cost

ti.com/product/CD4052B

Design References

See the Analog Engineer's Circuit Cookbooks for TI's comprehensive circuit library.

Power Supply Reference Designs

The ADS125H02 device requires three analog power supplies (high-voltage supplies HV_AVDD and

HV_AVSS, and low-voltage analog supply AVDD) and a digital power supply (DVDD). This circuit

assumes a bipolar supply (±15.0 V) for HV_AVDD and HV_AVSS, and a 5.0-V supply. The following table

shows there are specifications for three reference designs that could be used to provide the power

supplies from a 24.0 V nominal input voltage.

PMP10532 PMP10516 TIDA-00689

Schematic

Test Results Schematic

Design Guide

VIN range (V) 19.0–30.0V 20.4–28.8V 16.0–32.0V

Input type DC

VOUT (V) Output 1 15.0

Output 2 –15.0

Output 3 5.00

IOUT(maximum) (A) Output 1 0.200 0.200 0.601

Output 2 0.200 0.060 0.601

Output 3 1.000 0.100 0.200

POUT(maximum) (W) Output 1 3.0 3.0 0.5

Output 2 3.0 0.9

Output 3 5.0 0.5

Isolation ✔ ✔ ✔

Total efficiency at VIN = 24V and Maximum IOUT 86.0% 78.8% 44.0%

Footprint 60.0mm × 30.0mm Approximately 60.0mm × 35.0mm 12.7mm × 40.8mm

Topology Fly-Buck™ Fly-Buck™ + Linear regulator Fly-Buck™ + Split rail

converter

For direct support from TI Engineers use the E2E online support forums

e2e.ti.com

Trademarks

Fly-Buck is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

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