AD6649 Analog Devices, AD6649 Datasheet - Page 33

• Manufacturer Part Number: AD6649
• Description: IF Diversity Receiver
• Manufacturer: Analog Devices

Data Sheet
Addr
(Hex)
0x0D
0x0E
0x10
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1C
0x1D
0x1E
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)
User Test
Pattern 2 LSB
(global)
User Test
Pattern 2 MSB
(global)
User Test
Pattern 3 LSB
(global)
User Test
Pattern 3 MSB
(global)
Bit 7
(MSB)
User test
mode
control
0 = con-
tinuous/
repeat
pattern
1 = single
pattern,
then 0s
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
Open
Open
Open
Bit 4
Reset PN
short gen
Open
Output
enable bar
(local)
Open
Open
User Test Pattern 1[15:8]
User Test Pattern 2[15:8]
User Test Pattern 3[15:8]
User Test Pattern 1[7:0]
User Test Pattern 2[7:0]
User Test Pattern 3[7:0]
Rev. A | Page 33 of 40
Offset adjust in LSBs from +31 to −32
Bit 3
Open
Open
(twos complement format)
LVDS output drive current adjust
0000 = 3.72 mA output drive current
0001 = 3.5 mA output drive current (default)
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 (reduced range)
1000 to 1111 = reserved
Open
DCO clock delay
[delay = (3100 ps × register value/31 +100)]
00000 = 100 ps
00001 = 200 ps
00010 = 300 ps
…
11110 = 3100 ps
11111 = 3200 ps
Full-scale input voltage selection
01111 = 2.087 V p-p
…
00001 = 1.772 V p-p
00000 = 1.75 V p-p (default)
11111 = 1.727 V p-p
…
10000 = 1.383 V p-p
Bit 2
Reset BIST
sequence
Output
invert (local)
1 = normal
(default)
0 = inverted
Output test mode
0000 = off (default)
0001 = midscale short
0010 = positive FS
0011 = negative FS
0100 = alternating checkerboard
0101 = PN long sequence
0110 = PN short sequence
0111 = one/zero word toggle
1000 = user test mode
1001 to 1110 = unused
1111 = ramp output
Open
Bit 1
Open
Open
Output format
00 = offset binary
01 = twos complement
(default)
10 = gray code
11 = reserved (local)
Bit 0
(LSB)
BIST enable
Open
Default
Value
(Hex)
0x00
0x00
0x00
0x05
0x01
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
AD6649
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.