AD9272 Analog Devices, AD9272 Datasheet - Page 42

• Manufacturer Part Number: AD9272
• Description: Octal LNA/VGA/AAF/ADC and Crosspoint Switch
• Manufacturer: Analog Devices

Specifications of AD9272

• Resolution (bits): 12bit
• # Chan: 8
• Sample Rate: 80MSPS
• Interface: LVDS,Ser
• Analog Input Type: SE-Uni
• Ain Range: 367 mV p-p,550 mV p-p,733 mV p-p
• Adc Architecture: Pipelined
• Pkg Type: QFP

AD9272
Addr.
(Hex)
0F
10
11
12
14
15
16
18
Register Name
Flex_channel_input
Flex_offset
Flex_gain
Bias_current
Output_mode
Output_adjust
Output_phase
Flex_vref
Bit 7
(MSB)
Filter cutoff frequency control
0000 = 1.3 × 1/3 × f
0001 = 1.2 × 1/3 × f
0010 = 1.1 × 1/3 × f
0011 = 1.0 × 1/3 × f
0100 = 0.9 × 1/3 × f
0101 = 0.8 × 1/3 × f
0110 = 0.7 × 1/3 × f
1000 = 1.3 × 1/4.5 × f
1001 = 1.2 × 1/4.5 × f
1010 = 1.1 × 1/4.5 × f
1011 = 1.0 × 1/4.5 × f
1100 = 0.9 × 1/4.5 × f
1101 = 0.8 × 1/4.5 × f
1110 = 0.7 × 1/4.5 × f
X
X
X
X
X
X
X
Bit 6
X
X
X
0 = LVDS
ANSI-644
(default)
1 = LVDS
low power,
(IEEE
1596.3
similar)
X
X
0 =
internal
reference
1 =
external
reference
SAMPLE
SAMPLE
SAMPLE
SAMPLE
SAMPLE
SAMPLE
SAMPLE
SAMPLE
SAMPLE
SAMPLE
SAMPLE
SAMPLE
SAMPLE
SAMPLE
(default)
Bit 5
6-bit LNA offset adjustment
10 0000 for LNA bias high, mid-high, mid-low (default)
10 0001 for LNA bias low
X
X
X
Output driver
termination
00 = none (default)
01 = 200 Ω
10 = 100 Ω
11 = 100 Ω
X
X
Rev. C | Page 42 of 44
Bit 4
X
X
X
X
X
Bit 3
X
PGA gain
00 = 21 dB
01 = 24 dB (default)
10 = 27 dB
11 = 30 dB
1
X
X
0011 = output clock phase adjust
(0000 through 1010)
(Default: 180° relative to data edge)
0000 = 0° relative to data edge
0001 = 60° relative to data edge
0010 = 120° relative to data edge
0011 = 180° relative to data edge
0100 = 240° relative to data edge
0101 = 300° relative to data edge
0110 = 360° relative to data edge
0111 = 420° relative to data edge
1000 = 480° relative to data edge
1001 = 540° relative to data edge
1010 = 600° relative to data edge
1011 to 1111 = 660° relative to data edge
X
Bit 2
X
X
Output
invert
1 = on
0 = off
(default)
X
X
Bit 1
X
LNA gain
00 = 15.6 dB
01 = 17.9 dB
10 = 21.3 dB
(default)
LNA bias
00 = high (default)
01 = mid-high
10 = mid-low
11 = low
00 = offset binary
(default)
01 = twos
complement
X
X
Bit 0
(LSB)
X
DCO±
and
FCO±
2× drive
strength
1 = on
0 = off
(default)
X
Default
Value
0x30
0x20
0x06
0x08
0x00
0x00
0x03
0x00
Default Notes/
Comments
Antialiasing filter
cutoff (global).
LNA force offset
correction
(local).
LNA and PGA
gain adjustment
(global).
LNA bias current
adjustment
(global).
Configures the
outputs and the
format of the data
(Bits[7:3] and
Bits[1:0] are global;
Bit 2 is local).
Determines LVDS
or other output
properties.
Primarily functions
to set the LVDS
span and
common-mode
levels in place of
an external resistor
(Bits[7:1] are global;
Bit 0 is local).
On devices that
use global clock
divide,
determines which
phase of the
divider output is
used to supply
the output clock.
Internal latching
is unaffected.
Select internal
reference
(recommended
default) or
external
reference
(global).