AD6643 Analog Devices, AD6643 Datasheet - Page 31

• Manufacturer Part Number: AD6643
• Description: Dual IF Receiver
• Manufacturer: Analog Devices

Data Sheet
Addr
(Hex)
0x0D
0x0E
0x10
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
Register
Name
Test mode
(local)
BIST enable
(local)
Offset adjust
(local)
Output
mode
Output
adjust
(global)
Clock phase
control
(global)
DCO output
delay
(global)
Input span
select
(global)
User Test
Pattern 1 LSB
(global)
User Test
Pattern 1
MSB (global)
Bit 7
(MSB)
User test
mode
control
0 =
continuous/
repeat
pattern
1 = single
pattern then
zeros
Open
Open
Open
Open
Invert DCO
clock
Enable DCO
clock delay
Open
Bit 6
Open
Open
Open
Open
Open
Open
Open
Open
Bit 5
Reset PN
long gen
Open
Open
Open
Odd/Even
mode
output
enable
0 =
disabled
1 =
enabled
Open
Open
User Test Pattern 1[15:8]
User Test Pattern 1[7:0]
Bit 4
Reset
PN
short
gen
Open
Output
disable
(local)
Open
Open
Rev. A | Page 31 of 36
Offset adjust in LSBs from +31 to −32
[delay = (3100 ps × register value/31 +100)]
(twos complement format)
Bit 3
Open
Open
Open
0001 = 3.5 mA output drive current (default)
Full-scale input voltage selection
00000 = 1.75 V p-p (default)
0000 = 3.72 mA output drive current
0010 = 3.30 mA output drive current
0011 = 2.96 mA output drive current
0100 = 2.82 mA output drive current
0101 = 2.57 mA output drive current
0110 = 2.27 mA output drive current
0111 = 2.0 mA output drive current
LVDS output drive current adjust
Bit 2
Reset BIST
sequence
0100 = alternating checkerboard
Output invert (local)
01111 = 2.087 V p-p
00001 = 1.772 V p-p
11111 = 1.727 V p-p
10000 = 1.383 V p-p
1 = normal (default)
0111 = one/zero word toggle
11110 = 3100 ps
11111 = 3200 ps
DCO clock delay
0110 = PN short sequence
00000 = 100 ps
00001 = 200 ps
00010 = 300 ps
0101 = PN long sequence
1000 to 1111 = reserved
1001 to 1110 = unused
0 = inverted
1000 = user test mode
0001 = midscale short
1111 = ramp output
0000 = off (default)
0011 = negative FS
Output test mode
0010 = positive FS
Open
(reduced range)
…
…
…
Bit 1
Open
Open
10 = gray code
Output format
11 = reserved
complement
00 = offset
01 = twos
(default)
binary
(local)
Bit 0
(LSB)
BIST
enable
Open
Default
Value
(Hex)
0x00
0x00
0x00
0x05
0x01
0x00
0x00
0x00
0x00
0x00
Default Notes/
Comments
When this
register is set,
the test data
is placed on the
output pins in
place of normal
data
Configures the
outputs and
the format of the
data
Full-scale input
adjustment in
0.022 V steps
AD6643