Datasheet

AD9648
Rev. 0 | Page 38 of 44
Addr
(Hex)
Register
Name
Bit 7
(MSB)
Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Bit 0
(LSB)
Default
Value
(Hex)
Comments
0x18 VREF
select
(global)
Open Open Open Open Open Internal V
REF
digital adjustment
000 = 1.0 V p-p
001 = 1.14 V p-p
010 = 1.33 V p-p
011 = 1.6 V p-p
100 = 2.0 V p-p
0x04 Select and/
or adjust
V
REF
0x19 User
Pattern 1
LSB
(global)
B7 B6 B5 B4 B3 B2 B1 B0 0x00 User-
defined
Pattern 1
LSB
0x1A User
Pattern 1
MSB
(global)
B15 B14 B13 B12 B11 B10 B9 B8 0x00 User-
defined
Pattern, 1
MSB
0x1B User
Pattern 2
LSB
(global)
B7 B6 B5 B4 B3 B2 B1 B0 0x00 User-
defined
Pattern 2
LSB
0x1C User
Pattern 2
MSB
B15 B14 B13 B12 B11 B10 B9 B8 0x00 User-
defined
Pattern, 2
MSB
0x24 MISR LSB MISR LSB[7:0] 0xFF Read only
0x25 MISR MSB MISR MSB[15:8] 0xFF Read only
0x2A Overrange
control
(global)
Open Open Open Open Open Open Open Overrange
output
0 =
disabled
1 =
enabled
0x01 Overrange
control
settings
0x2E Output
assign
(local)
Open Open Open Open Open Open Open 0 = ADC A
1 = ADC B
(local)
ADC A =
0x00
ADC B =
0x01
Assign an
ADC to an
output
channel
0x3A Sync
control
(global)
Open Open Open Open Open Sync
next only
Sync
enable
Open 0x00 Sets the
global sync
options
0x100 Sample
rate
override
Open Sample rate
override
enable
Resolution
010 = 14 bits
100 = 12 bits
110 = 10 bits
Sample rate
011 = 80 MSPS
100 = 105 MSPS
101 = 125 MSPS
0x00
0x101 User I/O
Control
Register 2
Output
enable
bar (OEB)
pin
enable
Open Open Open Open Open Open Disable
SDIO pull-
down
0x00 OEB and
SDIO pin
controls
0x102 User I/O
Control
Register 3
Open Open Open Open VCM power-
down
Open 0x00