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MAX2312EEI Datasheet(PDF) 7 Page - Maxim Integrated Products

Part # MAX2312EEI
Description  CDMA IF VGAs and I/Q Demodulators with VCO and Synthesizer
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX2312EEI Datasheet(HTML) 7 Page - Maxim Integrated Products

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CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
_______________________________________________________________________________________
7
Pin Description (continued)
27, 28
27, 28
Bypass Node. Must be capacitively decoupled (bypassed) to
analog VCC.
BYP
27, 28
27, 28
23, 24
23, 24
Differential CDMA Input. Active in CDMA mode.
CDMA-,
CDMA+
23, 24
23, 24
25
Differential Positive Input. Active in FM mode.
FM+
25
22
22
VGA Gain Control Input. Control voltage range is 0.5V to 2.3V.
VGC
22
22
20
20
Data input of the 3-wire serial bus.
DATA
20
20
19
19
Enable Input. When low, input shift register is enabled.
EN
19
19
18
18
Clock input of the 3-wire serial bus
CLK
18
18
16, 17
16, 17
Differential Quadrature-Phase Baseband Output. Disabled if
FM_I mode is selected.
QOUT-,
QOUT+
16, 17
16, 17
15
15
Lock Output—open-collector pin. Logic high indicates phase-
locked condition.
LOCK
15
15
13, 14
13, 14
Differential In-Phase Baseband Output, or FM signal output
FM_I mode is selected.
IOUT+,
IOUT-
13, 14
13, 14
12
12
Shutdown Input—active low. Low powers down entire device,
including registers and serial interface.
SHDN
12
12
11
11
Reference Frequency Input
REF
11
11
8
Internal VCO Output. Depending on setting of BD bit, LOOUT
is either the VCO frequency (twice the IF frequency) or one-
half the VCO frequency (equal to the IF frequency).
LOOUT
8
6, 7
5, 6
Differential Tank Input for High-Frequency Oscillator
TANKH+,
TANKH-
NAME
FUNCTION
PIN
MAX2310
MAX2312
MAX2314
MAX2316
7
LO Buffer Amplifier—active low
BUFEN
7
No Connection. Must be left open-circuit.
N.C.
6, 7
8
Mode Select. High selects CDMA mode; low selects FM
mode.
MODE
10
10
Digital Ground
GND
10
10
9
9
+2.7V to +5.5V Supply for Digital Circuits
VCC
9
9
21
21
2.7V to 5.5V Supply for Analog Circuits
VCC
21
21
26
Differential Negative Input for FM signal. Bypass to GND for
single-ended operation.
FM-
26
26
Standby Input—active low. Low powers down VGA and demod-
ulator while keeping VCO, PLL, and serial bus on.
STBY
26
25
No Connection.
N.C.
25


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