Power Supplies
Table 2. J7: Serial Interface Pins (continued)
Pin No.
J7.16
J7.17
Pin Name
SCL
TOUT
Signal Name
SCL
CLK
I/O Type
I
2
C
In
Pullup
High
None
Function
I
2
C clock
Can be used to provide
a clock from a
processor
Digital ground
I
2
C data
J7.18
J7.19
J7.20
DGND
GPIO5
SDA
DGND
CLK Select
SDA
In/Out
–
IC
2
None
None
High
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
for complete details on these pins.
4
Power Supplies
J11 is the power-supply input connector.
lists the configuration details for J11.
Table 3. J11 Configuration: Power-Supply Input
Pin No.
J11.1
J11.2
J11.3
J11.4
J11.5
J11.6
J11.7
J11.8
J11.9
J11.10
Pin Name
+VA
–VA
+5VA
–5VA
DGND
AGND
+1.8VD
VD1
+3.3VD
+5VD
Function
Unused
Unused
+5V analog supply
–5V
analog supply
Digital ground input
Analog ground input
1.8V digital supply
Unused
3.3V digital supply
+5V digital supply
Required
No
No
Always
Only in bipolar mode
Yes
Yes
No
No
Always
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.
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
1-2
3-4
5-6
7-8
9-10
Name
ADC AVDD
ADC AVSS
ADC DVDD
DGND
AGND
Function
AVDD supply current measurement point for the ADC. Must be
connected for operation.
AVSS supply current measurement point for the ADC. Must be
connected for operation.
DVDD supply current measurement point for the ADC. Must be
connected for operation.
Connects DGND to board ground.
Connects AGND to board ground.
SBAU142B
–
April 2009
–
Revised May 2011
ADS1148EVM, ADS1248EVM, ADS1148EVM-PDK, and ADS1248EVM-PDK
Copyright
©
2009–2011, Texas Instruments Incorporated
5
TI [ TEXAS INSTRUMENTS ]
