AD9148 Analog Devices, AD9148 Datasheet - Page 39

• Manufacturer Part Number: AD9148
• Manufacturer: Analog Devices

Specifications of AD9148

• Resolution (bits): 16bit
• Dac Update Rate: 1GSPS
• Dac Settling Time: n/a
• Max Pos Supply (v): +3.47V
• Single-supply: No
• Dac Type: Current Out
• Dac Input Format: LVDS,Par

Data Sheet
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
Addr
(Hex)
54
55
56
57
58
59
5A
5C
5D
5E
5F
72
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
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 a 0-to-1
Sideband select
Latch temp data
Temp sensor
power-down
00001010
Die Temp[7:0]
Die Temp[15:8]
DCI delay
Rev. B | Page 39 of 72
Function
See Register 0x57.
See Register 0x57.
See Register 0x57.
FTW[31:0] is the 32-bit frequency tuning word that
determines the 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 0.0055°. Value is
in twos complement format.
1 = bypass NCO.
extended FRAMEx_x pulse signal.
0→1 = The NCO is reset on the first extended FRAMEx_x
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 output high-side image.
1 = The modulator output 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 the aux ADC that converts die temperature. 1
Set these bits to 00001010 for optimal temperature sensor
operation.
Die Temp[15:0] indicates the approximate die temperature.
Die Temp[15:0] indicates the approximate die temperature.
Programmable delay added DCI.
00 = no added delay.
01 = 200 ps delay.
10 = 400 ps delay.
11 = 600 ps delay.
AD9148
Default
0
0
0
0
0
0
1
0
0
0
0
0
0
100000
Read-
only
Read-
only
00