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ADC32RF55 Datasheet(PDF) 95 Page - Texas Instruments

Part # ADC32RF55
Description  ADC32RF5x Dual Channel 14-bit 2.6 to 3-GSPS RF Sampling Data Converter
PDF  126 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ADC32RF55 Datasheet(HTML) 95 Page - Texas Instruments

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Figure 7-84. Register 0x180 (DDCA/B page)
7
6
5
4
3
2
1
0
0
0
DDC PDN
DDC DITH PDN
REAL DDC
DB/QB DDC
0
NCO MODE
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
Table 7-92. Register 0x180 Field Descriptions
Bit
Field
Type
Reset
Description
7-6
0
R/W
0
Must write 0
5
DDC PDN
R/W
0
This bit powers down the DDC mixer and NCO
0: DDC block enabled
1: DDC block powered down
4
DDC DITH PDN
R/W
0
This bit powers down the dither in the DDC digital block
0: DDC dither enabled
1: DDC dither powered down
3
REAL DDC
R/W
0
Set this bit to 1 in real decimation mode to disable the NCO.
0: Complex Decimation
1: Real Decimation
2
DB/QB DDC
R/W
0
This register splits the NCOs for dual or quad band operation.
0: Dual Band
1: Quad Band
1
0
R/W
0
Must write 0
0
NCO MODE
R/W
0
This register selects phase coherent or phase continuous
operation of the NCO.
0: Phase continuous
1: Phase coherent
Figure 7-85. Register 0x181 (DDCA/B page)
7
6
5
4
3
2
1
0
0
0
LOAD NCO
0
0
0
0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
Table 7-93. Register 0x181 Field Descriptions
Bit
Field
Type
Reset
Description
7-6
0
R/W
0
Must write 0
5-4
LOAD NCO
R/W
00
This register loads all the NCO frequencies from the memory to
the NCOs. To update the NCO this register has to be set to 3
and back to 0 as shown in Table 7-94.
3-0
0
R/W
0
Must write 0
Table 7-94. NCO frequency programming example
ADDR
DATA
DESCRIPTION
0x105
0x4E
Frequency = 920 MHz with FS = 3 GSPS
86,318,992,857,935 = 0x4E81B4E81BE4 where the MSB goes to address 0x105 and the
LSB to 0x100.
0x104
0x81
0x103
0xB4
0x102
0xE8
0x101
0x1B
0x100
0x4E
0x181
0x00
Load and update all NCO frequencies
0x181
0x30
www.ti.com
ADC32RF54, ADC32RF55
SBAS500A – JUNE 2022 – REVISED DECEMBER 2022
Copyright © 2022 Texas Instruments Incorporated
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Product Folder Links: ADC32RF54 ADC32RF55



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