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MAX2314EEI-MAX2316EEI
CDMA IF VGAs and I/Q Demodulators with VCO and Synthesizer
General Description
The MAX2310/MAX2312/MAX2314/MAX2316 are IF
receivers designed for dual-band, dual-mode, and sin-
gle-mode N-CDMA and W-CDMA cellular phone sys-
tems. The signal path consists of a variable gain
amplifier (VGA) and I/Q demodulator. The devices fea-
ture guaranteed +2.7V operation, a dynamic range of
over 110dB, and high input IP3 (-33dBm at 35dB gain,
1.7dBm at -35dB).
Unlike similar devices, the MAX2310 family of receivers
includes dual oscillators and synthesizers to form a
self-contained IF subsystem. The synthesizer’s refer-
ence and RF dividers are fully programmable through a
3-wire serial bus, enabling dual-band system architec-
tures using any common reference and IF frequency.
The differential baseband outputs have enough band-
width to suit both N-CDMA and W-CDMA systems, and
offer saturated output levels of 2.7Vp-p at a low +2.75V
supply voltage. Including the low-noise voltage-con-
trolled oscillator (VCO) and synthesizer, the MAX2310
draws only 26mA from a +2.75V supply in CDMA (dif-
ferential IF) mode.
The MAX2310/MAX2312/MAX2314/MAX2316 are avail-
able in 28-pin QSOP packages.
Applications
Single/Dual/Triple-Mode CDMA Handsets
Globalstar Dual-Mode Handsets
Wireless Data Links
Tetra Direct-Conversion Receivers
Wireless Local Loop (WLL)
FeaturesComplete IF Subsystem Includes VCO and
SynthesizerSupports Dual-Band, Triple-Mode OperationVGA with >110dB Gain ControlQuadrature DemodulatorHigh Output Level (2.7V)Programmable Charge-Pump CurrentSupports Any IF Frequency Between 40MHz and
300MHz3-Wire Programmable InterfaceLow Supply Voltage (+2.7V)
MAX2310/MAX2312/MAX2314/MAX2316
with VCO and Synthesizer
Ordering Information
Selector Guide
MAX2310/MAX2312/MAX2314/MAX2316
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC= +2.7V to +5.5V, MODE = DIVSEL = SHDN= STBY= BUFEN= high, differential output load = 10kΩ, TA= -40°C to +85°C,
registers set to default power-up settings. Typical values are at VCC= +2.75V and TA= +25°C, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCCto GND..............................................................-0.3V, +6.0VSHDNto GND.............................................-0.3V to (VCC + 0.3V)
STBY, BUFEN, MODE, EN, DATA,
CLK, DIVSEL...........................................-0.3V to (VCC+ 0.3V)
VGC to GND...............-0.3V, the lesser of +4.2V or (VCC+ 0.3V)
AC Signals TankH ±, TankL ±,
REF, FM ±, CDMA ±.................................................1.0V peak
Digital Input Current SHDN, MODE, DIVSEL,
BUFEN, DATA, CLK, EN, STBY.....................................±10mA
Continuous Power Dissipation (TA= +70°C)
28-pin QSOP (derate 10mW/°C above TA= +70°C)....800mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX2310/MAX2312/MAX2314/MAX2316
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
AC ELECTRICAL CHARACTERISTICS
(MAX2310/MAX2314 or MAX2312/MAX2316 EV kit, VCC= +2.75V, registers set to default power-up states, fIN = 210.88MHz for
CDMA, fIN= 85.88MHz for FM, fREF= 19.68MHz, synthesizer locked with passive 2nd-order lead-lag loop filter, SHDN= high, VGC
set for +35dB voltage gain, differential output load = 10kΩ, all power levels referred to 50Ω, TA= +25°C, unless otherwise noted.)
MAX2310/MAX2312/MAX2314/MAX2316
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2310/MAX2314 or MAX2312/MAX2316 EV kit, VCC= +2.75V, registers set to default power-up states, fIN = 210.88MHz for
CDMA, fIN= 85.88MHz for FM, fREF= 19.68MHz, synthesizer locked with passive 2nd-order lead-lag loop filter, SHDN= high, VGC
set for +35dB voltage gain, differential output load = 10kΩ, all power levels referred to 50Ω, TA= +25°C, unless otherwise noted.)
Note 1:FM_IQ and FM_I modes are not available on MAX2312 and MAX2316.
Note 2:Recommended operating frequency range.
Note 3:f1= 210.88MHz, f2= 210.89MHz, Pf1 = Pf2 = -15dBm.
Note 4:f1= 210.88MHz, f2= 210.89MHz, Pf1 = Pf2= -50dBm.
Note 5:Small-signal gain at 200kHz below the LO frequency will be reduced by less than 0.25dB when an interfering signal at
1.25MHz below the LO frequency is applied at the specified level.
Note 6:Guaranteed by design and characterization.
Note 7:f1= 85.88MHz, f2= 85.98MHz, Pf1 = Pf2= -15dBm.
Note 8:f1= 85.88MHz, f2= 85.98MHz, Pf1 = Pf2= -50dBm.
Note 9:Measured at LOOUT with BD = 0 (‚2 selected).
MAX2310/MAX2312/MAX2314/MAX2316
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
RECEIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2310 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
RECEIVE SHUTDOWN CURRENT vs.
SUPPLY VOLTAGE
MAX2310 toc02
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (mA)
GAIN vs. VGC
NAX2310 toc03
VGC (V)
GAIN (dB)100200300400500
GAIN vs. INPUT FREQUENCY
MAX2310 toc04
FREQUENCY (MHz)
GAIN (dB)
GAIN vs. BASEBAND FREQUENCY
MAX2310 toc05
FREQUENCY (MHz)
RELATIVE GAIN (dB)
THIRD-ORDER INPUT
INTERCEPT vs. GAIN
MAX2310 toc06
GAIN (dB)
IIP3 (dBm)
NOISE FIGURE vs. GAIN
MAX2310 toc07
GAIN (dB)
NF (dB)
NOISE FIGURE vs. TEMPERATURE
MAX2310 toc08
TEMPERATURE (°C)
NF (dB)LOCK
VCO
VOLTAGE
VCO VOLTAGE vs. TIME
MAX2310 toc09
TIME (500μs/div)
VOLTS (1V/div)
SHDN
Typical Operating Characteristics
(MAX2310/MAX2314 or MAX2312/MAX2316 EV kit, VCC= +2.75V, registers set to default power-up states, fIN= 210.88MHz for
CDMA, fIN= 85.88MHz for FM, fREF= 19.68MHz, synthesizer locked with passive 2nd-order lead-lag loop filter, SHDN= high, VGC
set for +35dB voltage gain, differential output load = 10kΩ, all power levels referred to 50Ω, TA= +25°C, unless otherwise noted.)
Pin Description
MAX2310/MAX2312/MAX2314/MAX2316
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
FM PORT
S11 vs. FREQUENCY
MAX2310 toc10
1: 641 - j428 10MHz
2: 27 - j162 85MHz
3: 4 - j73 210MHz
4: 1.8 - j39 600MHz
TANKL PORT
1/S11 vs. FREQUENCY
MAX2310 toc11
1: -3.06ms + j349μs, 100MHz
2: -3.01ms + j853μs, 160MHz
3: -3.11ms + j1.45ms, 240MHz
4: -3.04ms + j1.85ms, 300MHz
TANKH PORT
1/S11 vs. FREQUENCY
MAX2310 toc12
1: 1.98ms + j437µs, 100MHz
2: 2.18ms + j853µs, 160MHz
3: 2.11ms +j 2.53ms, 420MHz
4: 2.17ms +j 3.71ms, 600MHz
Typical Operating Characteristics (continued)
(MAX2310/MAX2314 or MAX2312/MAX2316 EV kit, VCC= +2.75V, registers set to default power-up states, fIN= 210.88MHz for
CDMA, fIN= 85.88MHz for FM, fREF= 19.68MHz, synthesizer locked with passive 2nd-order lead-lag loop filter, SHDN= high, VGC
set for +35dB voltage gain, differential output load = 10kΩ, all power levels referred to 50Ω, TA= +25°C, unless otherwise noted.)
MAX2310/MAX2312/MAX2314/MAX2316
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
Pin Description (continued)
MAX2310/MAX2312/MAX2314/MAX2316
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
_______________Detailed Description
MAX2310
The MAX2310 is intended for dual-band (PCS and cel-
lular) and dual-mode code division multiple access
(CDMA) and FM applications (Figure 1). The device
includes an IF variable-gain amplifier, quadrature
demodulator, dual VCOs, and dual-frequency synthe-
sizers (Figure 7). Dual VCOs are provided for applica-
tions using different IF frequencies for each mode or
band of operation. The analog FM output signal can be
configured for conversion to the I channel, or it may be
converted in quadrature to both the I and Q channels.
The MAX2310’s operation modes are described in
Table 1. These modes are set by programming the con-
trol register and setting logic levels on control pins. If
MODE is left floating, the internal register controls the
operation. If driven high or low, mode will override cer-
tain register bits, as shown in Table 1.
Figure 1. MAX2310 Typical Operating Circuit
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 BUFENpin enables this feature. A standby mode,
in which only the VCO and synthesizer are operational,
can be selected through the serial interface or the
STBYpin. 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.
MAX2310/MAX2312/MAX2314/MAX2316
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
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.
MAX2310/MAX2312/MAX2314/MAX2316
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
Figure 2a. MAX2312 Typical Operating Circuit
MAX2310/MAX2312/MAX2314/MAX2316
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
Figure 2b. MAX2316 Typical Operating Circuit

Partno	Mfg	Dc	Qty	Available	Descript
MAX2314EEI	MAX	N/a	12	avai	CDMA IF VGAs and I/Q Demodulators with VCO and Synthesizer
MAX2316EEI	MAXIM,MAXIM	N/a	25000	avai	CDMA IF VGAs and I/Q Demodulators with VCO and Synthesizer
MAX2316EEI	MAXIM	N/a	25	avai	CDMA IF VGAs and I/Q Demodulators with VCO and Synthesizer