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3
Digital Interface
The DAC7811EVM is designed for easy interfacing to multiple control platforms.
pinout of connector J2T located on the top side of the EVM;
located on the bottom side of the EVM. This header/socket combination allows the EVM user to stack up
to seven DAC7811EVMs together to demonstrate daisy-chain operation of the converter.
For daisy-chain operation, the shunt jumper at W2 should be moved for
each board in the stack so that the output voltages appear on different
pins of J1. Output voltages from multiple EVMs applied to the same pin of
J1 may cause permanent damage to the output amplifiers found at U2.
Pin Number
J2.1
J2.3
J2.5
J2.7
J2.9
J2.11
J2.13
J2.15
J2.17
J2.19
Pin Number
J2.1
J2.3
J2.5
J2.7
J2.9
J2.11
J2.13
J2.15
J2.17
J2.19
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Power Supplies
The DAC7811EVM board requires ±15 Vdc (max) for the analog section. This includes the 10-V reference
(U1) and its buffer (U3), an INA105 used to derive the –10-V reference voltage (U4), and the output
buffers (U2). All applied voltages should be from clean dc sources that are current limited to prevent
damage caused by accidental short circuits. Before changing the reference configuration or the output
voltage selection, it is recommended that the power first be removed from the EVM.
SLAU163 – September 2005
Table 2. Pinout of J2T
Signal
Unused
SCLK
Serial Clock - Signal is common to J2B
Unused
SYNC
Synchronization input to the DAC. Tied to the Frame Sync for DSP host systems – STE for SPI
Host systems - Signal is common to J2B
Unused
SDO
Serial Data Output - provides delayed serial data to additional EVMs (user may "stack" up to
seven boards together) - the applied signal may be monitored at the SDO test point located
beside J2.
Unused
Unused
Unused
SPARE
Table 3. Pinout of J2B
Signal
Unused
SCLK
Serial Clock - Signal is common to J2T
Unused
SYNC
Synchronization input to the DAC. Tied to the Frame Sync for DSP host systems – STE for SPI
Host systems - Signal is common to J2T
Unused
SDI
Serial Data Input - the applied signal may be monitored at the SDI test point located beside J2.
Unused
Unused
Unused
SPARE
Table 3
provides the pinout of connector J2B
CAUTION
Description
Description
Digital Interface
Table 2
provides the
DAC7811EVM
3
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