MAX2316EEI-T Maxim Integrated, MAX2316EEI-T Datasheet - Page 18

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MAX2316EEI-T

Manufacturer Part Number
MAX2316EEI-T
Description
Modulator / Demodulator
Manufacturer
Maxim Integrated
Datasheet
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
Table 4. Control Register, Default State: 0B57
Table 5. Register Defaults
18
BIT ID
POL
TM
TC
DS
VB
BD
BE
SB
SD
TE
VS
FT
IS
______________________________________________________________________________________
REGISTER
TURBO_CHARGE
CTRL
CP0
CP1
TEST_ENABLE
M1
M2
R1
R2
TEST_MODE
BIT NAME
VCO_BYP
VCO_SEL
FM_TYPE
BUF_DIV
DIV_SEL
CP_POL
BUFEN
IN_SEL
SHDN
STBY
POWER-
STATE
UP
0
1
0
1
1
0
1
0
1
0
1
1
1
DEFAULT
10519
OB57
4269
492
492
11 BIN
11 BIN
DEC
DEC
DEC
HEX
LOCATION
DEC
0 = LSB
BIT
12
11
10
9
8
7
6
5
4
3
2
1
0
Must be 0 for normal operation.
Logic “1” causes the charge-pump output CP_OUT to source cur-
rent when f
polarity is such that increasing voltage produces increasing fre-
quency. Logic “0” causes CP_OUT to source current when f
> f
the VCO frequency to decrease.
Must be 0 for normal operation.
Logic “1” activates turbocharge mode, which provides rapid fre-
quency acquisition in the PLL. Not available on MAX2316.
Logic “1” selects M1/R1 divide ratios. Logic “0” selects M2/R2.
Logic “1” bypasses the VCO inputs for external VCO operation.
Logic “1” selects VCO_H. Logic “0” selects VCO_L.
Logic “1” selects divide-by-2 on LOOUT port. Logic “0” bypasses
divider.
Logic “1” disables LOOUT. Logic “0” enables LOOUT.
Active in FM mode. Logic “0” selects quadrature demodulator for
FM mode. Logic “1” selects downconversion to I port.
Logic “0” selects FM input port. Logic “1” selects CDMA input.
Logic “0” enables standby mode, which shuts down the VGA and
demodulator stages, leaving the VCO locked and the registers
active.
Logic “0” enables register-based shutdown. This mode shuts down
everything except the M and R latches and the serial bus.
REF
h,
Table 6. Charge-Pump Control Bits
/R. This state is used when increasing tune voltage causes
Address: 110
CP1
REF
0
0
1
1
/R > f
VCO
/M. This state is used when the VCO tune
CP0
0
1
0
1
FUNCTION
b
CHARGE-PUMP CURRENT
AFTER ACQUISITION
(µA)
150
210
300
425
VCO
/M

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