AD9787 Analog Devices, AD9787 Datasheet - Page 32

• Manufacturer Part Number: AD9787
• Description: Dual 14-Bit 800 MSPS DAC with Low Power 32-Bit Complex NCO
• Manufacturer: Analog Devices

Specifications of AD9787

• Resolution (bits): 14bit
• Dac Update Rate: 800MSPS
• Dac Settling Time: n/a
• Max Pos Supply (v): +3.47V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: Par

AD9785/AD9787/AD9788
The frequency tuning word (FTW) register comprises four bytes located at Address 0x0A.
Table 20. Frequency Tuning Word (FTW) Register
Address
0x0A
The phase control register (PCR) comprises four bytes located at Address 0x0B.
Table 21. Phase Control Register (PCR)
Address
0x0B
The amplitude scale factor (ASF) register comprises three bytes located at Address 0x0C.
Table 22. Amplitude Scale Factor (ASF) Register
Address
0x0C
The output offset (OOF) register comprises four bytes located at Address 0x0D.
Table 23. Output Offset (OOF) Register
Address
0x0D
The version register (VR) comprises two bytes located at Address 0x0E and is read only.
Table 24. Version Register (VR)
Address
0x0E
[31:0]
Bit
[31:26]
[25:16]
[15:0]
[31:16]
[15:0]
Bit
Bit
[23:18]
[17:9]
[8:0]
Bit
Bit
[15:8]
[7:0]
Name
Frequency Tuning
Word [31:0]
Name
Q DAC Offset [15:0]
I DAC Offset [15:0]
Reserved
Phase Correction
Word [9:0]
NCO Phase Offset
Word [15:0]
Name
Name
Reserved
Q DAC Amplitude
Scale Factor [8:0]
I DAC Amplitude
Scale Factor [8:0]
Name
Reserved
Version ID
Description
These bits are the 16-bit Q DAC offset factor. The LSB bit weight is 2
These bits are the 16-bit I DAC offset factor. The LSB bit weight is 2
Description
Reserved for future use.
These bits are the 9-bit Q DAC amplitude scale factor. The bit weighting is MSB = 2
LSB = 2
1.0 (0x080), the gain block is bypassed. This changes the latency of the signal. Therefore, in
systems using quadrature signals, either both I and Q scale factors should be bypassed or
both should have gains set to a value other than 1.0.
These bits are the 9-bit I DAC amplitude scale factor. The bit weighting is MSB = 2
LSB = 2
Description
Reserved for future use.
These bits read back the current version of the product.
Description
These bits make up the frequency tuning word applied to the NCO phase accumulator.
See the Numerically Controlled Oscillator section for details.
Description
Reserved for future use.
These bits are the 10-bit phase correction word.
These bits are the 16-bit NCO phase offset word. See the Numerically Controlled Oscillator
section for details.
−7
−7
, which yields a multiplier range of 0 to 3.9921875. Note that by setting the gain to
, which yields a multiplier range of 0 to 3.9921875.
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