AD6642 Analog Devices, AD6642 Datasheet - Page 28

• Manufacturer Part Number: AD6642
• Description: Dual IF Receiver
• Manufacturer: Analog Devices

AD6642
Addr.
(Hex)
0x0D
0x0E
0x10
0x14
0x15
0x16
0x17
0x18
Register
Name
Test mode
(local)
BIST enable
(local)
Offset adjust
(local)
Output mode
(local)
Output adjust
(local)
Clock phase
control
(local)
DCO output
delay
(global)
V
(global)
REF
select
(MSB)
Bit 7
Open
Open
Open
Open
Open
Invert DCO
clock
0 = off
1 = on
DCO delay
enable
0 = off
1 = on
Open
Bit 6
Open
Open
Open
Open
Open
Open
Open
Open
Bit 5
Reset
long PN
generator
0 = on
1 = off
(default)
Open
Offset adjustment in LSBs from +127 to −128
(twos complement format)
011111 = +31 LSB
011110 = +30 LSB
011101 = +29 LSB
…
000010 = +2 LSB
000001 = +1 LSB
000000 = 0 LSB
…
111111 = −1 LSB
111110 = −2 LSB
111101 = −3 LSB
…
100001 = −31 LSB
100000 = −32 LSB
Open
Open
Open
Open
Open
Reset
short PN
generator
0 = on
1 = off
(default)
Open
Output
enable bar
(local)
1 = off
0 = on
Open
Open
Output port DCO clock delay
00000 = 100 ps additional delay on the DCO pin
00001 = 200 ps additional delay on the DCO pin
00010 = 300 ps additional delay on the DCO pin
…
11101 = 3.0 ns additional delay on the DCO pin
11110 = 3.1 ns additional delay on the DCO pin
11111 = 3.2 ns additional delay on the DCO pin
Internal V
Main reference full-scale V
01111: internal 2.087 V p-p
…
00001: internal 1.772 V p-p
00000: internal 1.75 V p-p
…
11111: internal 1.727 V p-p
…
10000: internal 1.383 V p-p
Bit 4
Rev. A | Page 28 of 32
REF
full-scale adjustment
Bit 3
Open
Open
Open
Output port LVDS drive current
0000 = 3.72 mA
0001 = 3.5 mA (default)
0010 = 3.3 mA
0011 = 2.96 mA
0100 = 2.82 mA
0101 = 2.57 mA
0110 = 2.27 mA
0111 = 2.0 mA
1000 = 2.0 mA
Open
Bit 2
Output test mode
000 = off (normal operation)
001 = midscale short
010 = positive FS
011 = negative FS
100 = alternating checkerboard
101 = PN sequence long
110 = PN sequence short
111 = 1/0 word toggle
BIST reset
0 = on
1 = off
(default)
Output
invert
(local)
1 = on
0 = off
Open
REF
adjustment
Open
Output format (local)
00 = offset binary
01 = twos
complement
Open
Bit 1
(LSB)
Bit 0
BIST
enable
1 = on
0 = off
(default)
Open
Default
Value
(Hex)
0x00
0x00
0x00
0x00
0x01
0x00
0x00
0x00
Comments
When set,
the test data
is placed on
the output
pins in place
of normal
data.
When Bit 0
is set, the
built-in self-
test function
is initiated.
Device
offset trim.
Configures
the outputs
and the
format of
the data.
Output
current
adjustments.
When Bit 7
is set, clock
polarity is
reversed.
Enable DCO
delay and
set the delay
time.
Select
adjustments
for V
REF
.