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FDN337N Fiches technique(PDF) 5 Page - Texas Instruments

No de pièce FDN337N
Description  Contains all support circuitry needed for the ADS1148/ADS1248
Download  34 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

FDN337N Fiches technique(HTML) 5 Page - Texas Instruments

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Power Supplies
Table 2. J7: Serial Interface Pins (continued)
Pin No.
Pin Name
Signal Name
I/O Type
Pullup
Function
J7.16
SCL
SCL
I
2C
High
I
2C clock
J7.17
TOUT
CLK
In
None
Can be used to provide
a clock from a
processor
J7.18
DGND
DGND
In/Out
None
Digital ground
J7.19
GPIO5
CLK Select
None
J7.20
SDA
SDA
I
2C
High
I
2C data
Many pins on J7 have weak pull-up resistors. These resistors provide default settings for many of the
control pins. Many pins on J7 correspond directly to ADS1248 pins. See the ADS1248 product data sheet
for complete details on these pins.
4
Power Supplies
J11 is the power-supply input connector. Table 3 lists the configuration details for J11.
Table 3. J11 Configuration: Power-Supply Input
Pin No.
Pin Name
Function
Required
J11.1
+VA
Unused
No
J11.2
–VA
Unused
No
J11.3
+5VA
+5V analog supply
Always
J11.4
–5VA
–5V analog supply
Only in bipolar mode
J11.5
DGND
Digital ground input
Yes
J11.6
AGND
Analog ground input
Yes
J11.7
+1.8VD
1.8V digital supply
No
J11.8
VD1
Unused
No
J11.9
+3.3VD
3.3V digital supply
Always
J11.10
+5VD
+5V digital supply
No
All of the power supplies (AVDD, AVSS, and DVDD) have corresponding jumpers on J10 that can be
replaced with a current meter to measure the respective supply currents.
4.1
Power Options
J10 is arranged as five rows, each of which can be shorted. Table 4 lists the power option details for J10.
For normal operation, J10.1-2, J10.3-4, and J10.5-6 must be connected (direct or through an ammeter),
and either (or both) of J10.7-8 and J10.9-10 must be connected; otherwise, the board does not function.
Table 4. J10 Configuration: Power Options
Row
Name
Function
1-2
ADC AVDD
AVDD supply current measurement point for the ADC. Must be
connected for operation.
3-4
ADC AVSS
AVSS supply current measurement point for the ADC. Must be
connected for operation.
5-6
ADC DVDD
DVDD supply current measurement point for the ADC. Must be
connected for operation.
7-8
DGND
Connects DGND to board ground.
9-10
AGND
Connects AGND to board ground.
5
SBAU142B
– April 2009 – Revised May 2011
ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK
Submit Documentation Feedback
Copyright
© 2009–2011, Texas Instruments Incorporated


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