CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
Table 3. MAX2309 Control Register States
M
L
OPERATIONAL
MODE
ACTION
RESULT
PINS
S
B
CONTROL REGISTER
S
B
Shutdown pin com-
SHUTDOWN
pletely powers down
L
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
the chip
0 in shutdown register
SHUTDOWN
bit leaves serial bus
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
active
0 in standby pin turns
STANDBY
off VGA and modulator
H
L
0
X
X
1
only
STANDBY
0 in standby register bit
turns off VGA and mod-
ulator only
H
H/
L
H
0
X
0
1
DIVIDER
SELECT
DIVIDER
SELECT
LO BUFFER
ENABLE
LO BUFFER
ENABLE
DIVSEL pin overrides
DIVSEL register bit
If DIVSEL pin is floated,
then register bit selects
divider
BUFEN pin controls the
LO buffer and overrides
the bit
If pin is floated, then
BUFEN register bit
controls buffer
H
H
H/
L
H
H/
L
F
H
F
H
H
0
0
0
0
X
1/
0
X
X
X
X
X
1/
0
1
1
1
1
Note: H = high, L = low, 1 = logic high, 0 = logic low, X = don’t care, blank = independent parameter.
______________________________________________________________________________________
13
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MAX230CWP+T 功能描述:RS-232接口集成电路 5V MultiCh RS-232 Driver/Receiver RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装:
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