AD9777-EB Analog Devices Inc, AD9777-EB Datasheet - Page 48

• Manufacturer Part Number: AD9777-EB
• Description: BOARD EVAL FOR AD9777
• Manufacturer: Analog Devices Inc
• Series: TxDAC+®r

Specifications of AD9777-EB

• Rohs Status: RoHS non-compliant
• Number Of Dac's: 2
• Number Of Bits: 16
• Outputs And Type: 2, Differential
• Sampling Rate (per Second): 160M
• Data Interface: Parallel
• Settling Time: 11ns
• Dac Type: Current
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD9777

AD9777
EVALUATION BOARD
The AD9777 evaluation board allows easy configuration of the
various modes, programmable via the SPI port. Software is
available for programming the SPI port from Windows® 95,
Windows 98, or Windows NT®/2000. The evaluation board also
contains an AD8345 quadrature modulator and support
circuitry that allows the user to optimally configure the AD9777
in an image reject transmit signal chain.
Figure 101 to Figure 104 describe how to configure the
evaluation board in the one-port and two-port input modes with
the PLL enabled and disabled. Refer to Figure 105 to Figure 114,
the schematics, and the layout for the AD9777 evaluation board
for the jumper locations described below. The AD9777 outputs
can be configured for various applications by referring to the
following instructions.
DAC Single-Ended Outputs
Remove Transformers T2 and T3. Solder jumper link JP4 or
JP28 to look at the DAC1 outputs. Solder jumper link JP29 or
JP30 to look at the DAC2 outputs. Jumpers 8 and 13 to 17
should remain unsoldered. Jumpers JP35 to JP38 may be used
to ground one of the DAC outputs while the other is measured
single-ended. Optimum single-ended distortion performance is
typically achieved in this manner. The outputs are taken from
S3 and S4.
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DAC Differential Outputs
Transformers T2 and T3 should be in place. Note that the lower
band of operation for these transformers is 300 kHz to 500 kHz.
Jumpers 4, 8, 13 to 17, and 28 to 30 should remain unsoldered.
The outputs are taken from S3 and S4.
Using the AD8345
Remove Transformers T2 and T3. Jumpers JP4 and 28 to 30
should remain unsoldered. Jumpers 13 to 16 should be
soldered. The desired components for the low-pass interface
filters L6, L7, C55, and C81 should be in place. The LO drive is
connected to the AD8345 via J10 and the balun T4, and the
AD8345 output is taken from J9.