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參數(shù)資料
| 型號(hào)： | MAX2314 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quad 2-input positive-NAND buffers with open collector outputs 14-SOIC 0 to 70 |
| 中文描述： | CDMA IF VGA及I/Q解調(diào)器，帶有VCO及合成器 |
| 文件頁數(shù)： | 18/22頁 |
| 文件大?。?/td> | 342K |
| 代理商： | MAX2314 |
M
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
18
______________________________________________________________________________________
Table 4. Control Register, Default State: 0B57
h,
Address: 110
b
Table 5. Register Defaults
Table 6. Charge-Pump Control Bits
DEFAULT
REGISTER
M2
4269
DEC
492
DEC
M1
10519
DEC
CTRL
OB57
HEX
11 BIN
R2
492
DEC
R1
CP1
11 BIN
CP0
SB
STBY
Logic “0” enables standby mode, which shuts down the VGA and
demodulator stages, leaving the VCO locked and the registers
active.
1
FT
FM_TYPE
Active in FM mode. Logic “0” selects quadrature demodulator for
FM mode. Logic “1” selects downconversion to I port.
1
0
3
SD
SHDN
Logic “0” enables register-based shutdown. This mode shuts down
everything except the M and R latches and the serial bus.
1
0
IS
IN_SEL
Logic “0” selects FM input port. Logic “1” selects CDMA input.
1
2
BE
BUFEN
Logic “1” disables LOOUT. Logic “0” enables LOOUT.
1
4
VS
VCO_SEL
Logic “1” selects VCO_H. Logic “0” selects VCO_L.
1
DS
DIV_SEL
Logic “1” selects M1/R1 divide ratios. Logic “0” selects M2/R2.
6
1
8
BD
BUF_DIV
Logic “1” selects divide-by-2 on LOOUT port. Logic “0” bypasses
divider.
0
5
VB
VCO_BYP
Logic “1” bypasses the VCO inputs for external VCO operation.
0
7
TE
TEST_ENABLE
Must be 0 for normal operation.
0
10
TC
TURBO_CHARGE
Logic “1” activates turbocharge mode, which provides rapid fre-
quency acquisition in the PLL.
1
9
POL
CP_POL
Logic “1” causes the charge-pump output CP_OUT to source cur-
rent when f
REF
/R > f
VCO
/M. This state is used when the VCO tune
polarity is such that increasing voltage produces increasing fre-
quency. Logic “0” causes CP_OUT to source current when f
VCO
/M
> f
REF
/R. This state is used when increasing tune voltage causes
the VCO frequency to decrease.
1
11
BIT NAME
FUNCTION
BIT ID
TM
TEST_MODE
Must be 0 for normal operation.
0
12
BIT
LOCATION
0 = LSB
POWER-
UP
STATE
CHARGE-PUMP CURRENT
AFTER ACQUISITION
(μA)
CP1
0
210
0
150
CP0
1
0
1
0
1
425
1
300
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