Texas Instruments AMC7823 EVM, Руководство пользователя, Страница: 11 / 19

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CS
SCLK
CLKR
FSX
FSR
MOSI
MISO
DAV
TOUT
NC
ELDAC
DGND
DGND
DGND
GPIO1_B
GPIO2_B
GALR
RESET
SCL
SDA
J2 J4
GPIO 0_A NC
BCLK
LRCLK
NC
NC
NC
NC
NC
NC
GPIO5_A
SCL
SDA
DGND
DGND
DGND
GPIO 1_A
GPIO 2_A
NC
NC
1
3
5
7
9
11
13
15
17
19
2
4
6
8
10
12
14
16
18
20
1
3
5
7
9
11
13
15
17
19
2
4
6
8
10
12
14
16
18
20
3.3 Serial EEPROM
3.4 Jumper Settings
1 3
1 3
1 3
EVM Operation
Figure 10. Digital Serial Interface Pinout
The analog signals can be applied directly to the J1T header connector, either single-ended or
differentially. To apply a differential signal into the AMC7823, make sure to disconnect the jumper from
W5 so that the AMC7823 can accommodate the signals correctly. For single-ended signal input, make
sure that W5 is shorted so that the signal ground is connected back to the analog ground.
The DAC outputs can be monitored from the J5 header connector directly. See the schematic and printed
circuit board silkscreen for details.
This EVM includes a 64-kbit I
2
C serial EEPROM, U4, to store firmware data. It is intended particularly for
future use with PC graphical user interface applications using a USB–MODEVM interface board or other
similar board.
The serial EEPROM is not used by the EVM itself, so it is not discussed further in this user’s guide.
Table 3 lists the function of each specific EVM jumper setting.
Table 3. Jumper Settings and Functions
Reference Jumper Setting Function
External reference input voltage via TP1 is selected to set the range of the ADC and the DAC.
W1 Internal reference voltage is used to set the range of the ADC and the DAC.
External reference input voltage via REF1 or REF2, as selected by W7, is routed to the reference
input pin of the AMC7823 to set the range of the ADC and the DAC.
SLAU171 – November 2005 AMC7823 Evaluation Module 11