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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 52/76頁 |
| 文件大?。?/td> | 1839K |
| 代理商： | AD6652PCB |
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AD6652
Rev. 0 | Page 52 of 76
PCLKn
t
DPREQ
PxREQ
PxACK
t
DPP
Px[15:0]
I[15:0]
Q[15:0]
PxIQ
PxCH[1:0]
PxCH[0] = AGC #
PxCH[1] = 0
RSSI[11:0]
PxCH[0] = AGC #
PxCH[1] = 1
t
DPIQ
t
DPCH
0
Figure 58. AGC with RSSI Word
AVE PCLK MODES
l ports operate in either master or
via the port clock control register (Addres
l po
o
e paralle
de is set
he paralle
ntentions n the PCLK pin.
co
slave mode. The
s 0x1E).
rts power up in slave mode to avoid possible
n master m de, PCLK is an output whose frequency is the
lues for PCLK_divisor[2:1] can range from 0 to 3, integer
ors of 2, 4,or 8, respectively, can be obtained. Because the
um c
CK rate in mas
elected by setting Bit 0 of Address 0x1E.
s
hest
ode is
n slave mo e, external circuitry provides the PCLK signal.
lave-mode PCLK signals can be either synchronous or
nchrono s. The maximum slave-mode PCLK frequency is
z.
100 MH
PARALLEL PORT PIN FUNCTIONS
PCLK
Input/output. As an output (master mode), the maximum
frequency is CLK/
n
, where CLK is the AD6652 clock and
n
is a
integer divisor 1, 2, 4 or 8. As an input (slave mode), it might be
asynchronous rel
n
ative to the AD6652 CLK. This pin powers up
as an input to avoid possible contentions. Other port outputs
ange on the rising edge of PCLK.
REQ
Active high output, synchronous to PCLK. A logic high on this
s that data is available to be shifted out of the port.
gic hig
igh until all pending data has been
ted out
K
hig
ronous input. Applying a logic low on this
hibit
el port data shifting. Applying a logic high to
pin wh
is high causes the parallel port to shift out
accor
med data mode. PxACK is
pled o
lling edge of PCLK. Data is shifted out on the
ising
f PCLK after PxACK is sampled. PxACK can
eld hig
ly. In this case, when data becomes
ilable, s
s 1 PCLK cycle after the assertion of
Q (see F
igure 58).
RE
igure 55 to F
PAIQ, PBIQ
Hig
ever I data is pres
low
PAC
], PBCH[1
Th
serve to identify d
mo
e pins form a 2-b
sou
nnel of the curren
ind
he AGC source (0
indica
hether the current data word
wor
PA[
PB[15:0]
Paral
tput data por
dep
h when
.
H[1:0
ese pins
de, thes
rce cha
icates t
tes w
d (1).
15:0],
lel ou
endent.
ent on the port output, otherwise
:0]
ata in both data modes. In channel
it binary number identifying the
t data word. In AGC mode, [0]
= AGC A, 1 = AGC B), and [1]
is I/Q data (0) or a gain
ts. Contents and format are mode-
MASTER/SL
Th
mo
T
I
AD6652 clo k frequency divided by the PCLK divisor. Because
va
divis
maxim
L
P
1,
lock rate of the AD6652 is 65 MHz, the hig
ter mode is also 65 MHz. Master m
I
S
asy
ch
pin indicate
A lo
shif
PxAC
Active
pin in
this
data
sam
next r
be h
ava
h value remains h
.
h asynch
s parall
en REQ
ding to the program
n the fa
edge o
h continuous
hifting begin
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