參數(shù)資料
型號(hào)： AD6652XBC
廠商： ANALOG DEVICES INC
元件分類： 通信及網(wǎng)絡(luò)
英文描述： SPECIALTY TELECOM CIRCUIT, PBGA256
封裝： 17 X 17 MM, MINI, BGA-256
文件頁(yè)數(shù)： 31/76頁(yè)
文件大小： 1802K
代理商： AD6652XBC
Preliminary Technical Data
AD6652
Rev. PrC | Page 37 of 76
p
int mode 8 + 4. In this mode, an
8-bit mantissa is followed by a 4-bit exponent. In mode 1x (x is
RCF OUTPUT SCALE FACTOR AND CONTROL
REGISTER
Register 0xA4 is a compound register used to configure several
aspects of the RCF register. Use Bits 3-0 to set the scale of the
fixed-point output mode. This scale value may also be used to
set the floating-point outputs in conjunction with Bit 6 of this
register.
Bits 4 and 5 determine the output mode. Mode 00 sets the chi
up in fixed-point mode. The number of bits is determined by
the serial port configuration.
Mode 01 selects floating-po
don’t care), the mode is 12 + 4, or 12-bit mantissa and 4-bit
exponent.
Table 17. Output Mode Formats
Format
Value
Floating Point 12 + 4
1x
Floating Point 8 + 4
01
Fixed Point
00
No
optimizes numerical accurac
rmally, the AD6652 determines the exponent value that
y. However, if bit 6 is set, the value
o scale the output. This ensures
uracy during conditions that may
CF scale, the scaling factor in dB is given by
For an RCF scale of 0, the scaling factor is equal to 18.06 dB,
ual
onent used is the one that
5).
p
here the input to each RCF originates. If Bit 9 is
clear, then the RCF input comes om the CIC5 normally
associate
e input
,
g
annel 0. This control bit is
ing.
I
i
l
e
c
e
at
i
rm l
de
However, if Bit 10 is set, then the RCF is bypassed to Channel
section for more details.
stored in Bits 3–0 is used t
consistent scaling and acc
warrant predictable output ranges. If Bits 3–0 are represented by
and for a maximum RCF scale of 15, the scaling factor is eq
to +72.25 dB.
If Bit 7 is set, the same exponent is used for both the real and
imaginary (I and Q) outputs. The exp
R
dB
Scale
RCF
Factor
Scaling
)
2
(
log
20
)
3
(
10
×
=
prevents numeric overflow at the expense of small signal
accuracy. However, this is seldom a problem, because small
numbers would represent 0 regardless of the exponent used.
Bit 8 is the RCF bank select bit used to program the register.
When this bit is 0, the lowest block of 128 is selected (taps 0 to
127). When high, the highest block is selected (taps 128 to 25
It should be noted that while the chip is computing filters, ta
127 is adjacent to 128 and there are no paging issues.
Bit 9 selects w
fr
d with the RCF. However, if the bit is set, then th
comes from CIC5 Channel 1. The only exception is Channel 1
which uses the output of CIC5 Channel 0 as its alternate. Usin
this feature, each RCF can either operate on its own channel
data or be paired with the RCF of Channel 1. The RCF of
Channel 1 can also be paired with Ch
used with polyphase distributed filter
f Bit 10 s c ear, th AD6652 hann l oper es n no
a mo .
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