MAX2308EGI Maxim Integrated Products, MAX2308EGI Datasheet - Page 16

• Manufacturer Part Number: MAX2308EGI
• Description: Modulator / Demodulator CDMA IF VGAs and I-Q Demodulators with V
• Manufacturer: Maxim Integrated Products

Specifications of MAX2308EGI

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
Figure 6. 3-Wire Interface Timing Diagram
16
Table 4. Control Register, Default State: 0B57
BIT ID
POL
TM
TC
DS
VB
BD
BE
SB
SD
TE
VS
FT
IS
______________________________________________________________________________________
TURBO_CHARGE
TEST_ENABLE
TEST_MODE
BIT NAME
VCO_BYP
VCO_SEL
FM_TYPE
BUF_DIV
DIV_SEL
CP_POL
BUFEN
IN_SEL
DATA
SHDN
STBY
CLK
EN
RISE AND FALL REQUIRED PRIOR TO EN GOING LOW.
MSB
*SB
POWER-
STATE
UP
0
1
0
1
1
0
1
0
1
0
1
1
1
*START BIT MUST BE LOGIC HIGH.
LOCATION
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.
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,
/R. This state is used when increasing tune voltage causes
Address: 110
REF
/R > f
VCO
/M. This state is used when the VCO tune
FUNCTION
b
LSB
VCO
/M