參數(shù)資料
型號(hào)： AD6652PCB
廠商： Analog Devices, Inc.
英文描述： 12-Bit, 65 MSPS IF to Baseband Diversity Receiver
中文描述： 12位，65 MSPS的IF到基帶分集接收機(jī)
文件頁(yè)數(shù)： 62/76頁(yè)
文件大小： 1839K
代理商： AD6652PCB
AD6652
individual magnitudes. When this bit is 1, then the I and Q data
is a complex floating-point number, where I and Q use a single
exponent that is determined based on the maximum magnitude
of I or Q.
Rev. 0 | Page 62 of 76
Bit 6 is used to force the output scale factor in Bits 3–0 of this
register to be used to scale the data even when one of the
floating-point output modes is used. If the number is too large
to represent with the output scale chosen, then the mantissas of
the I and Q data clip do not overflow.
Normally, the AD6652 determines the exponent value that
optimizes numerical accuracy. However, if Bit 6 is set, the value
stored in Bits 3–0 is used to s
consistent scaling and accura
redictable output ranges.
p
on.
cale the output. This ensures
cy during conditions that warrant
Bits 5 and 4 choose the output formatting option used by the
RCF data. The options are defined in the Table 27 and are
discussed further in the Output Port Control Registers secti
Table 27. Output Formats
Bit Value
Output Formatting Option
1x
12-bit mantissa and 4-bit exponent (12 + 4)
01
8-bit mantissa and 4-bit exponent (8 + 4)
00
Fixed point mode
Bits 3–0 of this register represent the output scale factor of the
RCF. The scale factor is used to scale the data when the output
format is in fixed-point mode or when the force exponent bit is
high. If Bits 3–0 are represented by RCF scale, the scaling facto
in dB is given by
r
actor is equal to
+72.25 dB.
0xA5: BIST Register for I
This register serves two purposes. The first is to allow the
complete functionality of the I datapath in the channel to be
tested in the system. See the User-Configurable Built-In Self-
Test (BIST) section for details. The second function is to
provide access to the I output data through the microport.
accomplish this, the Map RCF Data to BIST bit in the RCF
Control Register 2, 0xA9, shou
To
ld be set high. Then 16 bits of I
data can be read through the microport in either the 8 + 4,
12 + 4, 12-bit linear, or 16-bit linear output modes. This data
can come from either the formatted RCF output or the
CIC5 output.
0xA6: BIST Register for Q
This register serves two purposes. The first is to allow the
complete functionality of the Q data path in the channel to be
tested in the system. See the User-Configurable Built-In Self-
Test (BIST) section for further details. The second function is to
provide access to the Q output data through the microport. To
accomplish this, the Map RCF Data to BIST bit in the RCF
Control Register 2, 0xA9, should be set high. Then 16 bits of Q
data can be read through the microport in either the 8 + 4,
12 + 4, 12-bit linear, or 16-bit linear output modes. This data
can come from either the formatted RCF output or the
CIC5 output.
0xA7: BIST Outputs to Accumulate
This 20-bit register controls the number of outputs of the RCF
or CIC filter that are observed when a BIST test is perfo
The BIST signature registers at Addresses 0xA5 and 0xA
observe this number of o
of this register also starts the BIST en
on utilizing the BIST circuitry, see the User-Configurable Bui
In Self-Test (BIST) section.
0xA8: RAM BIST Control Register
This 3-bit register is used
a failure is suspected. Bit 0 of this register is written with a
1 when the channel is in sleep mode. The user waits for
1600 CLKs, and then polls the bits. If Bit 1 is high, then the
CMEM failed the test; if Bit 2 is high, then the data memory
used by the RCF failed the test.
0xA9: Output Control Re
Bit 9 of this register allows the RCF or CIC5 data to be ma
to the BIST registers at Addresses 0xA5 and 0xA6. When this bit
is 0, then the BIST register is in signature mode and ready for a
self-test to be run. When this bit is 1, then the output data from
the RCF (after formatting) or from CIC5 data is mapped to
these registers and can be read through the microport.
rmed.
6
utputs and then terminate. The loading
gine running. For details
lt-
to test the memories of the AD6652, if
gister
pped
Q.
nd
n
dB
Scale
RCF
Factor
Scaling
)
log
20
)
(
10
×
=
For an RCF scale of 0, the scaling factor is equal to 18.06 dB;
for a maximum RCF scale of 15, the scaling f
Bit 5 determines the word length used by the parallel port. If
this bit is 0, then the parallel port uses 12-bit words for I and
If this bit is 1, then the parallel port uses 16-bit words for I a
Q. When the fixed-point output option is chosen from the RCF
control register, then these bits also set the rounding correctly i
the output formatter of the RCF.
Bits 4–0 are reserved and should be written low when
programming.
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