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Texas Instruments ADS126 EVM-PDK Series User Manual Download Page 33

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EVM Schematic

12/31/2014

ADS126xEVM_RevA1_Schematic.SchDoc

Sheet Title:
Size:

Schematic:

Mod. Date:

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Texas Instruments and/or its licensors do not warrant the accuracy or completeness of this 
specification or any information contained therein. Texas Instruments and/or its licensors do not 
warrant that this design will meet the specifications, will be suitable for your application or fit for 
any particular purpose, or will operate in an implementation. Texas Instruments and/or its 
licensors do not warrant that the design is production worthy. You should completely validate 
and test your design implementation to confirm the system functionality for your application.

http://www.ti.com

Contact:

http://www.ti.com/support

ADS126xEVM

Project:

Designed for:

Public Release

6580279

A

Assembly Variant:

[No Variations]

© Texas Instruments 2014

1

2

3

4

5

6

JP4

DVDD

47pF

C4

47pF

C1

GND

AIN0

AIN1

IN0

IN1

GND

AIN2

AIN3

IN2

IN3

AIN4

AIN5

IN4

IN5

AIN2

AIN3

AIN4

AIN5

AIN6

AIN7

AIN9

AINCOM

AIN8

1
2
3
4
5
6
7
8
9

10

Pin #

Signal

+VA

-VA

+5VA

-5VA

DGND
AGND

+1.8VD

VD1

+3.3VD

+5VD

MMB0 Signals

1
2
3
4
5
6
7
8
9

10

Pin #

Signal

CNTL

GPIO0

CLKX

DGND

CLKR

GPIO1

FSX

GPIO2

FSR

DGND

MMB0 Signals

12
13
14
15
16
17
18
19
20

11

GPIO3

DR

GPIO4

*INT
SCL

TOUT

DGND
GPIO5

SDA

DX

1

2

3

4

5

6

7

8

9

1

0

J5

DAUGHTER-POWER

AIN1

AIN0

47pF

C26

47pF

C23

AIN6

AIN7

(EXT REF3 P)

(EXT REF3 N)

IN0

IN1

IN2

IN3

IN4

IN5

IN6

IN7

AINCOM

GND

CM f-3dB = 72 MHz
DM f-3dB = 16.9 kHz

INPUT FILTERING

TERMINAL BLOCK
Top Side

IN0

IN1

IN2

IN3

IN4

IN5

IN6

IN7

GND

+5V

GND

-5V

+3.3V

ANALOG

START

CS

SCLK

DIN

DOUT/DRDY

DRDY

RESET/PWDN

DIGITAL

SCLK

CS

START

AVSS

REFOUT

Bottom Side

GND

IN7

IN6

DIN

DOUT/DRDY

RESET/PWDN

100k

R3

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

J3

DAUGHTER-ANALOG

REFOUT

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

1

2

3

J1

DAUGHTER-SERIAL

DRDY

(Bottom Connects to MMB0)

Top and Bottom Side

(Connects to MMB0)

(Bottom Connects to MMB0)

Top and Bottom Side

AVDD

AVSS

DVDD

+3.3V

Power Measurement

TPS72325DBVT

-2.5V

IN

2

EN

3

OUT

5

BYP

4

GND

1

U3

TPS79225DBVT

+2.5V

IN

1

EN

3

OUT

5

BYP

4

GND

2

U2

GND

GND

+5V

GND

-5V

GND

+5V

GND

GND

GND

AVDD

AVSS

DVDD

AVDD

AVSS

Positive Supply

Negative Supply

(-5V Supply must be supplied by user)

ED555/2DS

1

2

J4

Thermocouple

Cold Junction = GND

10uF

C29

10uF

C30

10uF

C31

1uF

C27

1uF

C32

100nF

C28

1uF

C13

47

R21

GND

X2Y Capacitor

100nF

C18

100nF

C25

ED555/10DS

1

2

3

4

5

6

7

8

9

10

J2

100k

R4

100k

R5

499

R26

GND

AIN8

AIN9

CM f-3dB = 319 kHz
DM f-3dB = 1.59 kHz

FILTERING

1nF

C34

1
2

JP5

Sensor Bias

(Test SIG P)

(Test SIG N)

499

R28

100nF

C36

1nF

C37

(EXT REF2 P)

(EXT REF2 N)

(EXT REF1 N)

(EXT REF1 P)

AVSS Connection

47

R16

47

R18

47pF

C21

47pF

C16

GND

GND

GND

X2Y Capacitor

47

R20

47

R12

47

R8

47

R6

47

R1

GND

1uF

C12

GND

GND

X2Y Capacitor

100nF

C9

47pF

C11

47pF

C7

GND

NI

R24

IN7

NI

R22

IN6

1

2

JP3

AVSS

2.2k @ 25°C

t°

R

T

1

12k

R23

Thermistor (for CJC)

Jumper

NI

C2

NI

C8

NI

C35

4.7nF

C5

100nF

C3

1uF

C6

AIN8

1

AIN9

2

AINCOM

3

CAPP

4

CAPN

5

AVDD

6

AVSS

7

REFOUT

8

START

9

CS

10

SCLK

11

DIN

12

DOUT/DRDY

13

DRDY

14

XTAL1/CLKIN

15

XTAL2

16

BYPASS

17

DGND

18

DVDD

19

RESET/PWDN

20

AIN0

21

AIN1

22

AIN2

23

AIN3

24

AIN4

25

AIN5

26

AIN6

27

AIN7

28

U1

ADS126xIPW

A0

1

A1

2

A2

3

VSS

4

SDA

5

SCL

6

WP

7

VCC

8

U4

24AA256-I/ST

SCL

SDA

SCL
SDA

0

R32

NI

R27

+3.3V

2.7k

R29

2.7k

R30

EEPROM

X1

ECS-73-18-10X

1
2

JP2

33pF

C14

INT/EXT Clock
Jumper

Clock Select

Switch

Jumper

AVDD

AVSS

0.01uF

C20

1uF

C10

AVDD

0.01uF

C19

GND

AVSS

GND

AINCOM

NI

R2

NI

R10

3.9k

R17

1

3

2

S1

CAS-120TB

1

6

3

2

5

4

Pos 1

Pos 2

S2

CAS-220TB

Switch

Supply Polarity

33pF

C15

DVDD

REFOUT1

GND3

IN1

IN2

AVDD

AVSS

DVDD

GND

47pF

C22

AINCOM

AINCOM1

1

2

D1
DDZ6V2B-7

47

R7

47

R9

47

R11

47

R13

47

R14

47

R15

100nF

C33

GND

GND

GND

GND

GND

GND

GND

GND

GND

GND1

GND2

620

R19

R19 increases REF3N voltage to >0.3V when used with

500uA IDAC in single supply and ratiometric configurations

(Used by MMB0 only)

-5V Input

GND

GND

NI

C17

GND

GND

NI

C24

X2Y Capacitor

X2Y Capacitor

MMB0 passes signals through to J10

TERMINAL BLOCK
Top Side

or EXT Supply Jumpers

1.2k

R25

Input

GND

Configured for 250uA IDAC

1
2

JP1

Ratiometric
Connection

IN4

IN6

Jumper

in single supply configuration

(Install 0-Ohms in R22 & R24)

R17 sets up a 1.95V reference

voltage with 500uA IDAC

NI

R31

GND

Summary of Contents for ADS126 EVM-PDK Series

Page 1: ...of the hardware and software bill of materials and schematic for the ADS126xEVM Throughout this document the terms ADS126xEVM demonstration kit evaluation board evaluation module and EVM are synonymo...

Page 2: ...onfiguration for the 6 V Wall Adapter 8 7 MMB0 Configuration for a Unipolar Bench Power Supply 9 8 MMB0 Configuration for a Bipolar Bench Power Supply 10 9 A Schematic of ADS126xEVM Clocking Circuitry...

Page 3: ...ctions 6 3 J1 Serial Interface Header 12 4 ADS126x Analog Input Pin Functions 14 5 ADS126xEVM Bill of Materials 31 3 SBAU206 April 2015 ADS126xEVM PDK Submit Documentation Feedback Copyright 2015 Texa...

Page 4: ...ponents and clock circuitry All these sections connect to the ADS126x TSSOP package located in the center of the EVM Figure 1 visually identifies each of these areas on the EVM Figure 1 ADS126xEVM Par...

Page 5: ...current controlled reference voltage across JP3 Shorted R17 JP4 1 2 3 4 and 5 6 shorted Power supply connections to the ADS126x JP5 Shorted Connects the thermocouple input J4 1 to AINCOM for biasing S...

Page 6: ...t SCLK J1 3 SCLK Serial clock SPI DIN J1 11 DIN Data in DOUT DRDY J1 13 DOUT Data out DRDY J1 15 DRDY Data ready 3 3 V J5 9 3 3V Digital supply Power 5 V J5 3 5V Analog supply Channels 0 5 J3 1 6 AIN0...

Page 7: ...g the included 6 V wall adapter power supply An additional 5 V supply voltage is required when using the ADS126xEVM with bipolar supplies Configuring the EVM and MMB0 for each of these cases is demons...

Page 8: ...MB0 board generates the 5 V analog supply and 3 3 V digital supply for the ADS126xEVM Figure 6 MMB0 Configuration for the 6 V Wall Adapter NOTE For clarity the ADS126xEVM daughter card is not shown in...

Page 9: ...er supply to be connected to 5VA on the J14 terminal block Jumper J13B connects 5VA to 5VD and must remain shorted In this configuration the MMB0 derives the 3 3 V digital supply for the ADS126xEVM fr...

Page 10: ...y to the 5VA net on terminal block J14 as shown in Figure 8 After the MMB0 is configured latch switch S2 on the ADS126xEVM into the 1 2 and 4 5 position switched to the right to select the bipolar sup...

Page 11: ...S126xEVM has an onboard crystal oscillator component X1 The crystal oscillator clock is detected by the ADS126x when switch S1 is in the 1 2 position switched to the right as shown in Figure 9B 2 ADS1...

Page 12: ...p CS 7 8 Unused select 100 k pull up Unused 9 10 GND Ground Serial port data input DIN 11 12 Unused Serial port data output and DOUT DRDY 13 14 data ready indicator active Unused low Data ready indica...

Page 13: ...Top Side 1 2k R25 Input GND Configured for 250uA IDAC 1 2 JP1 Ratiometric Connection IN4 IN6 Jumper in single supply configuration Install 0 Ohms in R22 R24 R17 sets up a 1 95V reference voltage with...

Page 14: ...c routine 2 6 1 2 IDAC Output The ADS126x provides dual matched current sources IDAC1 and IDAC2 for biasing of resistive temperature devices RTDs thermistors and other resistive based sensors The IDAC...

Page 15: ...the J2 header on inputs IN7 IN6 and IN4 Two IDACs output 250 A each on pins AINCOM and AIN3 of the ADS126x Jumper wires then connect IN7 to COM and IN6 to IN3 These jumper wires route the IDAC curren...

Page 16: ...3 surface mount pads to connect RT1 to inputs AIN6 and AIN7 on the ADS126x R23 is in parallel with RT1 for linearization of the thermistor resistance versus temperature transfer function NOTE Do not u...

Page 17: ...s unable to connect to the EVM this driver may not have properly installed This driver may be reinstalled with one of the installers located at ftp ftp ti com pub data_acquisition ADCPro2 misc drivers...

Page 18: ...eated to reload the plugin The plugin may need to be reloaded in the case of a communication failure or if power is cycled on the EVM hardware Figure 13 Loading the ADS1262EVM Plugin in ADCPro 2 Wait...

Page 19: ...may precede steps 1 to 3 but is required before acquiring data in the next step Figure 16 Loading a Test Plugin in ADCPro 5 Acquire data by clicking the Acquire or Continuous button previously shown i...

Page 20: ...s selects that function for both inputs and configures the PGA as recommended Note that the ADC2 radio buttons are only visible when an ADS1263EVM is connected Clicking the AINCOM button enables the V...

Page 21: ...rence inputs and allows for fully flexible reference source inputs Figure 18 Tab 2 Settings When using an external reference source for ADC1 also make sure that the ADC1 REF Voltage field is matched t...

Page 22: ...at least the ADC1 Data Rate setting because the firmware only polls for new ADC2 data when an ADC1 conversion completes Setting the ADC2 Data Rate much slower than the ADC1 Data Rate may require a muc...

Page 23: ...ut Make sure to account for the analog filter settling time when enabling or disabling the burnout current source The Additional Settings controls configure other sensor bias related functions Input C...

Page 24: ...ng the GPIO value does nothing when configured as an input Figure 21 Tab 5 Settings Clicking Read GPIO or modifying any of controls on this tab reads the GPIODAT register and updates all value indicat...

Page 25: ...an example using the following settings Pos Test Signal Supply Ratio 0 525 Neg Test Signal Supply Ratio 0 475 Test DAC to ADC1 Input to ADC1 to select the Test DAC as the input source for ADC1 PGA1 G...

Page 26: ...ta to Test Plug in control ADC2 data appear in the test plugin panel and ADC1 data appear in the ADCx Data graph However it is possible to switch between ADC1 and ADC2 data sets in the test plugin wit...

Page 27: ...n the selected calibration routine During a calibration routine CAL in Progress lights up to show that the calibration process is ongoing If the calibration completes successfully CAL Completed lights...

Page 28: ...ODE2 and ADC2CFG when applicable registers to nondefault ADS126x values indicated by asterisks in the register map table To revert all register settings back to the true ADS126x default values use the...

Page 29: ...than the programmed alert value The pop up notifies the user of the estimated acquisition time and provides the option to continue or cancel the acquisition Cancelling an acquisition in progress requ...

Page 30: ...of the STATUS byte error flags to check if any errors occurred in the previous acquisition as shown in Figure 28 This window automatically appears when an error flag is found in the acquired data set...

Page 31: ...C32 7 2 33 pF C14 C15 CAP CERM 33 pF 50V NP0 5 0402 Yageo CC0402JRNPO9BN330 8 2 10 000 pF C19 C20 CAP CERM 0 01 uF 50V X7R 10 Yageo CC0402KRX7R9BB103 0402 9 2 0 1 uF C28 C33 CAP CERM 100 nF 50V X7R 1...

Page 32: ...RT1 Thermistor NTC 2 2k Ohm 1 0805 Vishay NTCS0805E3222FMT 32 1 S1 SWITCH SLIDE SPDT GULLWING Copal Electronics CAS 120TB 33 1 S2 SWITCH SLIDE DPDT GULLWING Copal Electronics CAS 220TB 34 7 SH J1 SH...

Page 33: ...PIC170A PIC170B PIC170G COC17 PIC1801 PIC1802 COC18 PIC1901 PIC1902 COC19 PIC2001 PIC2002 COC20 PIC2101 PIC2102 COC21 PIC2201 PIC2202 COC22 PIC2301 PIC2302 COC23 PIC240A PIC240B PIC240G COC24 PIC2501...

Page 34: ...ing the warranty period to the address designated by TI and that are determined by TI not to conform to such warranty If TI elects to repair or replace such EVM TI shall have a reasonable time to repa...

Page 35: ...transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indic...

Page 36: ...ified allowable ranges some circuit components may have elevated case temperatures These components include but are not limited to linear regulators switching transistors pass transistors current sens...

Page 37: ...REMOVAL OR REINSTALLATION ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES RETESTING OUTSIDE COMPUTER TIME LABOR COSTS LOSS OF GOODWILL LOSS OF PROFITS LOSS OF SAVINGS LOSS OF USE L...

Page 38: ...sponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related inf...

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