AD9644 Analog Devices, AD9644 Datasheet - Page 35

• Manufacturer Part Number: AD9644
• Description: 14-Bit, 80 MSPS/155 MSPS, 1.8V Dual, Serial Output A/D Converter
• Manufacturer: Analog Devices

Specifications of AD9644

• Resolution (bits): 14bit
• # Chan: 2
• Sample Rate: 155MSPS
• Analog Input Type: Diff-Bip
• Ain Range: 1.75 V p-p
• Adc Architecture: Pipelined

Data Sheet
Addr
(Hex)
0x0D
0x0E
0x10
0x14
0x15
0x18
0x19
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
0x20
0x21
Register
Name
Test mode
(local)
BIST enable
(global)
Offset adjust
(local)
Output mode
Output adjust
(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)
User Test
Pattern 4 LSB
(global)
User Test
Pattern 4 MSB
(global)
PLL Control
(global)
Bit 7
(MSB)
User test
mode
control
0 =
continuo
us/repeat
pattern
1 = single
pattern
Open
Open
Open
Open
Open
Open
Bit 6
Open
Open
Open
Open
Open
Open
Open
Bit 5
Reset PN long
generator
Open
Open
Open
Open
Open
Open
User Test Pattern 1 [15:8]
User Test Pattern 2 [15:8]
User Test Pattern 3 [15:8]
User Test Pattern 4 [15:8]
User Test Pattern 1 [7:0]
User Test Pattern 2 [7:0]
User Test Pattern 3 [7:0]
User Test Pattern 4 [7:0]
Bit 4
Reset
PN
short
generat
or
Open
Output
disable
(local)
Open
Rev. C | Page 35 of 44
Offset adjust in LSBs from +31 to −32
(twos complement format)
Bit 3
Open
Open
Open
PLL Low
encode
rate
enable
Full-scale input voltage selection
00000 = 1.75 V p-p (default)
01111 = 2.087 V p-p
00001 = 1.772 V p-p
11111 = 1.727 V p-p
10000 = 1.383 V p-p
Bit 2
Reset BIST
sequence
Output
invert
(local)
Open
Open
0100 = alternating checkerboard
0111 = one/zero word toggle
0110 = PN short sequence
0101 = PN long sequence
1001 to 1110 = unused
1000 = user test mode
…
…
0001 = midscale short
1111 = ramp output
0000 = off (default)
0011 = negative FS
Output test mode
0010 = positive FS
Bit 1
Open
Open
01 = twos complement
Output drive level
00 = offset binary
11 = offset binary
10 = gray code
Output format
11 = 320 mV
10 = 440 mV
01 = 500 mV
00 = 400 mV
(default)
adjust
Bit 0
(LSB)
BIST enable
(local)
Open
Default
Value
(Hex)
0x00
0x00
0x00
0x01
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
AD9644
Default/
Comments
When this
register is
set, test data
is used in
place of
normal ADC
data
Configures
outputs and
the format
of the data
Full-scale
input
adjustment
in 0.022 V
steps
Bit 3 must be
enabled if
ADC clock
rate is less
than 60 MSPS