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參數(shù)資料
| 型號(hào)： | MAX2310 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | CDMA IF VGAs and I/Q Demodulators with VCO and Synthesizer |
| 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)： | 9/22頁 |
| 文件大?。?/td> | 342K |
| 代理商： | MAX2310 |
M
B
MAX2312/MAX2316
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
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.
M
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
_______________________________________________________________________________________
9
Table 1. MAX2310 Control Register States
M
S
PINS
X
L
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
SHUTDOWN
ACTION
RESULT
OPERATIONAL
MODE
T
X
C
T
X
X
T
D
X
V
V
X
X
X
B
B
X
X
F
I
X
S
S
M
S
B
L
S
B
CONTROL REGISTER
X
X
X
X
X
X
H
X
SHUTDOWN
X
X
X
X
X
X
X
0
X
X
X
0
X
H
X
STANDBY
X
X
1
0
0
H
H
CDMA
X
X
X
X
X
1
X
1
0
F
H
CDMA
1
1
X
X
1
1
X
1
0
L
H
FM_IQ
X
X
X
X
X
1
0
1
0
F
H
FM_IQ
X
X
0
1
0
1
0
L
H
FM_I
X
X
X
X
X
1
1
1
0
F
H
L
FM_I
X
X
0
1
1
1
Note:
H = high, L = low, F = floating pin, X = don’t care, Blank = independent parameter, 1 = logic high, 0 = logic low.
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| MAX2310EEI | CDMA IF VGAs and I/Q Demodulators with VCO and Synthesizer |
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