MAX2314EEI+T Maxim Integrated, MAX2314EEI+T Datasheet - Page 9

• Manufacturer Part Number: MAX2314EEI+T
• Description: Modulator / Demodulator
• Manufacturer: Maxim Integrated

Specifications of MAX2314EEI+T

• Rohs: yes

The MAX2312/MAX2316 quadrature demodulators are
simplified versions of the MAX2310 that can be used in
single-mode CDMA or dual mode using an external FM
discriminator (Figures 2a and 2b). The MAX2312 VCO
is optimized for the 67MHz to 300MHz IF frequency
range, while the MAX2316 VCO is optimized for the
40MHz to 150MHz IF frequency range.
Both devices include a buffered output for the VCO.
The buffered VCO output can be used to support sys-
tems implementing traditional limiting IF stages for FM
demodulation in dual-mode phones as well as for the
transmit LO in TDD systems. This buffered output can
Table 1. MAX2310 Control Register States
Note: H = high, L = low, F = floating pin, X = don’t care, Blank = independent parameter, 1 = logic high, 0 = logic low.
OPERATIONAL
SHUTDOWN
SHUTDOWN
STANDBY
MODE
CDMA
CDMA
FM_IQ
FM_IQ
FM_I
FM_I
_______________________________________________________________________________________
Shutdown pin completely
powers down the chip
0 in shutdown register bit leaves
serial port active
0 in standby register bit turns off
VGA and modulator only
Mode pin overrides VCO_SEL,
DIVSEL, and IN_SEL to high
Floating mode pin returns control
to register
Mode pin overrides VCO_SEL,
DIVSEL, and IN_SEL to low
Floating mode pin returns control
to register
Mode pin overrides VCO_SEL,
DIVSEL, and IN_SEL to low
Floating pins return control to
register
CDMA IF VGAs and I/Q Demodulators
RESULT
ACTION
MAX2312/MAX2316
H
H
H
H
H
H
H
H
L
L
PINS
with VCO and Synthesizer
H
X
X
X
F
L
F
L
F
M
S
B
X
X
X
be configured for the VCO frequency (twice the IF fre-
quency) or one-half the VCO frequency (IF frequency).
The BUFEN pin enables this feature. A standby mode,
in which only the VCO and synthesizer are operational,
can be selected through the serial interface or the
STBY pin. The MAX2312/MAX2316s’ operational modes
are described in Table 2. These modes are set by pro-
gramming the control register and/or setting logic lev-
els on control pins. If the control pins (STBY, BUFEN,
DIVSEL) are left floating, the internal register controls
the operational mode. If driven high or low, the control
pins will override certain register bits, as shown in
Table 2.
X
X
X
X
X
0
0
0
0
0
0
0
X
X
CONTROL REGISTER
X
X
X
1
X
X
X
X
M
B
S
X
X
X
X
X
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
1
1
X
X
X
X
X
1
0
0
X
X
0
1
1
1
1
1
1
S
B
L
X
0
1
1
1
1
1
1
1
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