AD9148BPCZ AD [Analog Devices], AD9148BPCZ Datasheet - Page 38

• Manufacturer Part Number: AD9148BPCZ
• Description: Quad 16-Bit,1 GSPS, TxDAC+ Digital-to-Analog Converter
• Manufacturer: AD [Analog Devices]

AD9148
Register Name
FTW (LSB)
FTW
FTW
FTW (MSB)
Phase Offset MSB
Phase Offset LSB
DDS/Mod Control
Die Temp Control 0
Die Temp Control 1
Die Temp (LSBs)
Die Temp (MSBs)
DCI Delay
PLL Ctrl (Test)
Addr
(Hex)
54
55
56
57
58
59
5A
5C
5D
5E
5F
72
79
Bit
7:0
7:0
7:0
7:0
7:0
7:0
7
5
4
3
2
0
1
0
7:0
7:0
7:0
1:0
7:0
Name
FTW[7:0]
FTW[15:8]
FTW [23:16]
FTW [31:24]
NCO Phase
Offset[15:8]
NCO Phase
Offset[7:0]
Bypass DDS/MOD
Frame NCO reset ack 1 = indicates that the NCO has been reset due to an
Frame NCO
reset request
FTW update ack
FTW update request 0→1 = FTW is updated with the SPI value on 0 to 1
Sideband select
Latch temp data
Temp Sensor
power down
00001010
Die Temp[7:0]
Die Temp[15:8]
DCI Delay[1:0]
11111111
Rev. PrA | Page 38 of 73
See Register 0x57.
Die Temp[15:0] indicates the approximate die temperature.
Die Temp[15:0] indicates the approximate die temperature.
Set these bits to 11111111 for optimal PLL operation.
Function
See Register 0x57.
See Register 0x57.
FTW[31:0] is the 32-bit frequency tuning word that
determines frequency of the complex carrier generated by
the on-chip NCO. The frequency is not updated when the
FTW registers are written. The values are only updated when
Register 0x5A[2] transitions from 0 to 1.
See Register 0x59.
NCO Phase Offset[15:0] sets the phase of the complex carrier
signal when the NCO is reset. The phase offset spans between
0º and 360º. Each bit represents an offset of 0.0055º. Value is
in twos complement format.
1 = bypass NCO.
extended FRAME pulse signal.
0→1 = The NCO is reset on the first extended FRAME
pulse after this bit transitions from 0 to 1.
1 = indicates that the FTW has been updated with the
SPI value.
transition of this bit.
0 = The modulator outputs high-side image.
1 = The modulator outputs low-side image. The image is
spectrally inverted compared to the input data.
0 → 1 = latches temp sensor data. This should be completed
before the Die Temp[15:0] is readback.
1 = powers down aux ADC that converts die temperature.
Set these bits to 00001010 for optimal temperature sensor
operation.
Programmable delay added DCI.
00 = no added delay.
01 = 200 ps delay.
10 = 400 ps delay.
11 = 600 ps delay.
Preliminary Technical Data
Default
0
0
0
0
0
0
1
0
0
0
0
0
0
1
100000
Read-
only
Read-
only
00
40