Analog Devices AD9273, Руководство пользователя

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AD9273
Rev. B | Page 42 of 48
Addr.
(Hex) Register
Name
Bit 7
(MSB)
Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Bit 0
(LSB) Default
Value Default Notes/
Comments
0F FLEX_CHANNEL_
INPUT
Filter cutoff frequency control
0000 = 1.3 × 1/3 × f
SAMPLE
0001 = 1.2 × 1/3 × f
SAMPLE
0010 = 1.1 × 1/3 × f
SAMPLE
0011 = 1.0 × 1/3 × f
SAMPLE
(default)
0100 = 0.9 × 1/3 × f
SAMPLE
0101 = 0.8 × 1/3 × f
SAMPLE
0110 = 0.7 × 1/3 × f
SAMPLE
1000 = 1.3 × 1/4.5 × f
SAMPLE
1001 = 1.2 × 1/4.5 × f
SAMPLE
1010 = 1.1 × 1/4.5 × f
SAMPLE
1011 = 1.0 × 1/4.5 × f
SAMPLE
1100 = 0.9 × 1/4.5 × f
SAMPLE
1101 = 0.8 × 1/4.5 × f
SAMPLE
1110 = 0.7 × 1/4.5 × f
SAMPLE
X X X X 0x30 Antialiasing filter
cutoff (global).
10 FLEX_OFFSET X X 6-bit LNA offset adjustment
10 0000 = LNA bias high, mid-high, mid-low (default)
10 0001 = LNA bias low 0x20 LNA force offset
correction
(local).
11 FLEX_GAIN X X X X PGA gain
00 = 21 dB
01 = 24 dB (default)
10 = 27 dB
11 = 30 dB
LNA gain
00 = 15.6 dB
01 = 17.9 dB
10 = 21.3 dB
(default) 0x06 LNA and PGA
gain adjustment
(global).
12 BIAS_CURRENT X X X X 1 X LNA bias
00 = high
01 = mid-high
(default)
10 = mid-low
11 = low
0x08 LNA bias current
adjustment
(global).
14 OUTPUT_MODE X 0 = LVDS
ANSI-644
(default)
1 = LVDS
low power,
(IEEE
1596.3
similar) X X X Output
invert
1 = on
0 = off
(default)
00 = offset binary
(default)
01 = twos
complement 0x00 Configures the
outputs and the
format of the data
(Bits[7:3] and
Bits[1:0] are global;
Bit 2 is local).
15 OUTPUT_ADJUST X X Output driver
termination
00 = none (default)
01 = 200 Ω
10 = 100 Ω
11 = 100 Ω X X X DCO±
and
FCO±
2× drive
strength
1 = on
0 = off
(default) 0x00 Determines LVDS
or other output
properties. Pri-
marily 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).
16 OUTPUT_PHASE X X X X 0011 = output clock phase adjust
(0000 through 1010)
0000 = 0° relative to data edge
0001 = 60° relative to data edge
0010 = 120° relative to data edge
0011 = 180° relative to data edge (default)
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 0x03 On devices that
utilize global
clock divide,
determines which
phase of the
divider output is
used to supply
the output clock.
Internal latching
is unaffected.
18 FLEX_VREF X 0 =
internal
reference
1 =
external
reference
X X X X X X 0x00 Select internal
reference
(recommended
default) or external
reference (global).