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/CS

FSX

SCLK

MOSI

MISO

/CS

SCLK

CH_SEL

SDO

GPIO5

EXT_REF_IN

SCLK

REF+

REF IN/EXT

/CS or FSX

VD 5.0/3.3

Unipolar

AGND

AGND

AGND

+VD

+5VA

EXT_REF

UniPolar VCM_Ouput

CH_SEL

*

*

*

*

*

*

*

*

*

*

*

*

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

P2

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

P1

1

2

3

4

5

6

7

8

9

10

P3

1

GND

2

AVDD

3

REFP

4

REFN

5

AIN0P

6

AIN0N

7

AIN1N

8

AIN1P

9

NC

10

NC

11

CH_SEL

12

PDEN

13

CS

14

SCLK

15

SDO

16

DVDD

17

THERMAL_PAD

U1

ADS7945/6

2

VIN

3

TEMP

6

VOUT

4

GND

5

TRIM

U2

REF5040

REF5040IDGKT

2

3

4

6

7

U3

OPA350EA/250

1

A0

2

A1

3

A2

4

GND

5

SDA

6

SCL

7

WP

8

VCC

U4

24LC256-I/ST

R1

47

R2

47

R3

47

R4

47

J1

R6

10k

C3

22u

C1

0.1u

C2

1u

R5

10k

R7

NI

R8

47

R9

0

J2

C4

1u

R11

1k

C6

10u

R12

0

C8

2.2u

C9

1000p

C10

1u

J3

C11

22u

C12

1000p

C13

0.1u

C14

1u

R14

3k

R15

1k

1

2

3

4

5

6

U5

OPA836IDBVT

R16

10k

R17

10k

C15

2.2p

C16

1000p

C17

0.1u

1

2

3

4

5

6

U6

OPA836IDBVT

R18

10k

C18

2.2p

C20

0.1u

R20

4.99

R21

4.99

1

2

3

4

5

6

U7

OPA836IDBVT

R22

10k

R23

10k

C21

2.2p

C22

1000p

C23

0.1u

R26

4.99

R27

4.99

C27

1000p

C28

1000p

R28

47

1

2

3

4

5

J10

1

2

3

4

5

J11

T1

T2

T3

T4

T5

T6

T7

C5

10u

R10

NI

R19

NI

1

2

3

4

5

6

U8

OPA836IDBVT

R24

10k

C19

2.2p

C24

0.1u

T8

R25

NI

R29

NI

R31

47

R32

1

R34

47

R35

1

R37

47

C25

1000p

R38

1

R39

10k

R40

1

R42

47

C26

1000p

R43

NI

R44

NI

R45

10k

R46

1

C29

10u

1

2

3

4

5

J4

1

2

3

4

5

J5

1

CLK

2

D

3

Q

4

GND

5

Q

6

C

L

R

7

P

R

E

8

V

C

C

U9

SN74LVC2G74DCTR

R30

1.5k

J6

+5VA

+VD

+3.3VD

+5VA

+3.3VD

+5VD

+5VA

+VD

+5VD

+3.3VD

+5VA

+5VA

+5VA

+5VA

+5VA

+5VA

+VD

UN_POL_VCM

A0(+)

A0(-)

A0(+)

A0(-)

A1(+)

UN_POL_VCM

UN_POL_VCM

UN_POL_VCM

UN_POL_VCM

A1(-)

A0(+)

A0(-)

A1(-)

A1(+)

A1(+)

A1(-)

Schematic

www.ti.com

24

SBAU194B – August 2011 – Revised September 2017

Submit Documentation Feedback

Copyright © 2011–2017, Texas Instruments Incorporated

ADS794xEVM and ADS794xEVM-PDK

9

Schematic

Figure 18

shows the EVM schematic.

Figure 18. EVM Schematic

Содержание ADS794xEVM

Страница 1: ...dules EVMs allow evaluation of all aspects of either the ADS7946 or ADS7945 devices ADS794x Both devices are 14 bit dual channel ultralow power differential successive approximation register SAR analo...

Страница 2: ...0 4 ADS794xEVM PDK Plug In Installer 11 5 Completed ADS794xEVM PDK Installer 11 6 MMB0 Jumper Locations 12 7 Connecting ADS794xEVM to MMB0 13 8 Powering Up ADS794xEVM PDK 14 9 NI VISA Driver Installat...

Страница 3: ...t can be expanded easily with new test and data collection plug ins The ADS794xEVM PDK is controlled by a plug in running in ADCPro For more information about ADCPro see the ADCPro Analog to Digital C...

Страница 4: ...d P2 4 A0 CH0 negative differential input for ADS7945 single ended input for ADS7946 P2 10 A1 OPEN CH1 positive differential input for ADS7945 open if ADS7946 is installed P2 12 A1 CH1 negative differ...

Страница 5: ...M and ADS794xEVM PDK 2 1 ADS794xEVM Analog Inputs with ADS7945 Installed Each channel of the ADS7945 uses two OPA836 operational amplifiers to drive the fully differential inputs The input signals can...

Страница 6: ...gle ended input voltage The input signals can be applied to either the SMA or P2 header connectors These operational amplifiers offset the input signal to use an inverting configuration with a single...

Страница 7: ...only used to program the U4 EEPROM on the EVM board P1 2 P1 5 6 P1 8 9 P1 12 P1 14 15 and P1 17 Unused Unused 3 1 Serial Interface SPI The ADS794x ADC uses SPI serial communication in mode 0 CPOL 0 C...

Страница 8: ...V analog power supply connected to P3 3 4 2 Digital Power Options The ADS794xEVM uses a jumper in J3 to connect the digital power supply to either 3 3 VD P3 10 or 5 VD P3 9 J3 in position 1 2 connects...

Страница 9: ...nal range from 0 V to VREF for all EVM analog inputs In this mode the voltage read at the ADC is equal to VREF VIN Mode 2 DC Coupled Bipolar Inputs J6 Open DC coupled bipolar signals are typically pro...

Страница 10: ...nal entry pin is P1 7 J1 2 3 The logic level is 3 3 V J3 2 3 The onboard 4 096 V is selected as the reference voltage J1 1 2 Analog input range is 0 V to VREF 4 096 V with dc coupled signals J6 closed...

Страница 11: ...Refer to the ADCPro User Guide for instructions on installing and using ADCPro 6 2 Installing ADS794xEVM PDK Plug In Software The ADS794xEVM PDK plug in uses ADCPro you must install ADCPro before upl...

Страница 12: ...connected Step 1 Unpack the ADS794xEVM PDK kit Step 2 Set the three jumpers on the MMB0 REV D as shown in Figure 6 Below Figure 6 there is a check list that explains the functionality of each jumper F...

Страница 13: ...3 V The MMB0 uses 3 3 V logic to communicate with the ADS7945xEVM Step 5 Set jumper J1 on the ADS794xEVM to position 2 3 in order to place the CS signal in P1 7 of the EVM The MMB0 sends the CS signa...

Страница 14: ...icates Figure 8 Powering Up ADS794xEVM PDK After the power supply is connected four green LEDs in the bottom right hand corner of the MMB0 motherboard should light up If these LEDs do not light up dis...

Страница 15: ...drive with the ADCPro files Direct the PC to search the driver and install it by clicking Next at every prompt Figure 9 NI VISA Driver Installation Prompt 6 5 2 USBStyx Driver Installation The USBStyx...

Страница 16: ...as previously installed on the PC the status area should show the message Select Device without prompting for the driver If this message appears close ADCpro and proceed to Section 7 Step 5 This drive...

Страница 17: ...ontact Texas Instruments 7 2 Loading the ADS794xEVM PDK Plug in The ADS794xEVM PDK plug in for ADCPro provides complete control over all settings of the ADS794x You can adjust the ADS794xEVM settings...

Страница 18: ...nput that must be set by the user to identify whether the ADS7945 or ADS7946 is installed on the board 2 Channel Select This user input selects the channel to be sampled 3 Data Rate This control shows...

Страница 19: ...ata MultiHistogram This option acquires data and creates a histogram of code values MultiScope This feature acquires data and displays it in a graph of voltage vs time For further details regarding ho...

Страница 20: ...226ML T 5 3 3 C5 C6 C29 Capacitor X7R Ceramic 10 6 3WV 0805 Taiyo Yuden JMK212B7106KG T 6 1 1 C8 Capacitor X7R Ceramic 10 10WV 0603 Murata GRM188R71A225KE15D 7 6 6 C9 C12 C16 C26 C27 C28 Capacitor C0G...

Страница 21: ...Resistor Thick Film Chip 1 10W 0603 Panasonic ERJ 3GEY0R00V 0 2 R25 R29 26 3 3 T1 T2 T4 Test point PC Mini 040 D Red Keystone 5000 27 3 3 T5 T6 T7 Test point PC Mini 040 D Black Keystone 5001 28 1 1 T...

Страница 22: ...ts Incorporated ADS794xEVM and ADS794xEVM PDK 8 2 Board Layouts Figure 14 through Figure 17 show the PCB layouts for the ADS794xEVM NOTE Board layouts are not to scale These figures are intended to sh...

Страница 23: ...d Schematic 23 SBAU194B August 2011 Revised September 2017 Submit Documentation Feedback Copyright 2011 2017 Texas Instruments Incorporated ADS794xEVM and ADS794xEVM PDK Figure 16 ADS794xEVM PCB Power...

Страница 24: ...16 10k R17 10k C15 2 2p C16 1000p C17 0 1u 1 2 3 4 5 6 U6 OPA836IDBVT R18 10k C18 2 2p C20 0 1u R20 4 99 R21 4 99 1 2 3 4 5 6 U7 OPA836IDBVT R22 10k R23 10k C21 2 2p C22 1000p C23 0 1u R26 4 99 R27 4...

Страница 25: ...TE Page numbers for previous revisions may differ from page numbers in the current version Changes from A Revision February 2016 to B Revision Page Added missing schematic diagram 24 Changes from Orig...

Страница 26: ...set forth above or credit User s account for such EVM TI s liability under this warranty shall be limited to EVMs that are returned during the warranty period to the address designated by TI and that...

Страница 27: ...the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated Antenna types not included in this list having a gain great...

Страница 28: ...t the EVM user guide prior to connecting any load to the EVM output If there is uncertainty as to the load specification please contact a TI field representative During normal operation even with the...

Страница 29: ...OST OF 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...

Страница 30: ...TI Resource NO OTHER LICENSE EXPRESS OR IMPLIED BY ESTOPPEL OR OTHERWISE TO ANY OTHER TI INTELLECTUAL PROPERTY RIGHT AND NO LICENSE TO ANY TECHNOLOGY OR INTELLECTUAL PROPERTY RIGHT OF TI OR ANY THIRD...

Страница 31: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments ADS7945EVM PDK...

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