AD9780 Analog Devices, AD9780 Datasheet - Page 23

• Manufacturer Part Number: AD9780
• Description: Dual 12-Bit, LVDS Interface 500 MSPS DAC
• Manufacturer: Analog Devices

Specifications of AD9780

• Resolution (bits): 12bit
• Dac Update Rate: 500MSPS
• Dac Settling Time: n/a
• Max Pos Supply (v): +3.47V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: LVDS,Par

SPI PORT, RESET, AND PIN MODE
In general, when the AD9780/AD9781/AD9783 are powered
up, an active high pulse applied to the RESET pin should follow.
This ensures the default state of all control register bits. In
addition, once the RESET pin goes low, the SPI port can be
activated; thus, CSB should be held high.
For applications without a controller, the AD9780/AD9781/
AD9783 also supports pin mode operation, which allows some
functional options to be pin selected without the use of the SPI
port. Pin mode is enabled anytime the RESET pin is held high.
Rev. A | Page 23 of 36
In pin mode, the four SPI port pins take on secondary
functions, as shown in Table 13.
Table 13. SPI Pin Functions (Pin Mode)
Pin
Name
SDIO
CSB
SDO
Pin Mode Function
DATA (Register 0x02, Bit 7), bit value (1/0) equals pin
state (high/low).
Enable mix mode. If CSB is high, Register 0x0A is set
to 0x05, putting both DAC1 and DAC2 into mix mode.
Enable full power-down. If SDO is high, Register 0x03
is set to 0xFF.
AD9780/AD9781/AD9783