AD9271 Analog Devices, AD9271 Datasheet - Page 40

• Manufacturer Part Number: AD9271
• Description: Octal LNA/VGA/AAF/ADC and Crosspoint Switch
• Manufacturer: Analog Devices

Specifications of AD9271

• Resolution (bits): 12bit
• # Chan: 8
• Sample Rate: 50MSPS
• Interface: LVDS,Ser
• Analog Input Type: SE-Uni
• Ain Range: 0.25 V p-p,0.32 V p-p,0.4 V p-p
• Adc Architecture: Pipelined
• Pkg Type: QFP

AD9271
Addr.
(Hex)
19
1A
1B
1C
21
22
2B
2C
2D
1
X = an undefined feature
Register Name
user_patt1_lsb
user_patt1_msb
user_patt2_lsb
user_patt2_msb
serial_control
serial_ch_stat
flex_filter
analog_input
cross_point_switch
B7
B15
B7
B15
LSB first
1 = on
0 = off
(default)
X
X
X
X
Bit 7
(MSB)
Bit 6
B6
B14
B6
B14
X
X
Enable
automatic
low-pass
tuning
1 = on
0 = off
(default)
X
X
Bit 5
B5
B13
B5
B13
X
X
X
X
X
Rev. B | Page 40 of 60
Bit 4
B4
B12
B4
B12
X
X
X
X
Crosspoint switch enable
0 0000 = CWD0± (differential)
0 0001 = CWD1± (differential)
0 0010 = CWD2± (differential)
0 0011 = CWD3± (differential)
0 0100 = CWD4± (differential)
0 0101 = CWD5± (differential)
0 0111 = power down CW channel
1 0000 = CWD0+ (single ended)
1 0001 = CWD1+ (single ended)
1 0010 = CWD2+ (single ended)
1 0011 = CWD3+ (single ended)
1 0100 = CWD4+ (single ended)
1 0101 = CWD5+ (single ended)
1 0111 = power down CW channel
1 1000 = CWD0− (single ended)
1 1001 = CWD1− (single ended)
1 1010 = CWD2− (single ended)
1 1011 = CWD3− (single ended)
1 1100 = CWD4− (single ended)
1 1101 = CWD5− (single ended)
1 1111 = power down CW channel
Bit 3
B3
B11
B3
B11
<10
MSPS,
low
encode
rate
mode
1 = on
0 = off
(default)
X
X
X
Bit 2
B2
B10
B2
B10
000 = 12 bits (default, normal bit
stream)
001 = 8 bits
010 = 10 bits
011 = 12 bits
100 = 14 bits
X
X
X
Bit 1
B1
B9
B1
B9
Channel
output
reset
1 = on
0 = off
(default)
High-pass filter cutoff
00 = dc (default)
01 = 700 kHz
10 = 350 kHz
X
Bit 0
(LSB)
B0
B8
B0
B8
Channel
power-
down
1 = on
0 = off
(default)
LOSW-x
1 = on
0 = off
(default)
Default
Value
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x07
Notes/
Comments
User-defined
pattern, 1 LSB
(global).
User-defined
pattern, 1 MSB
(global).
User-defined
pattern, 2 LSB
(global).
User-defined
pattern, 2 MSB
(global).
Serial stream
control. Default
causes MSB first
and the native
bit stream
(global).
Used to power
down individ
ual sections of
a converter
(local).
Filter cutoff
(global).
LNA active
termination/
input
impedance
(global).
Crosspoint
switch
enable (local).