
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
General Description
The MAX2306/MAX2308/MAX2309 are IF receivers
designed for dual-band, dual-mode, and single-mode
N-CDMA and W-CDMA cellular phone systems. The
signal path consists of a variable-gain amplifier (VGA)
and I/Q demodulator. The devices feature guaranteed
+2.7V operation, a gain control range of over 110dB,
and high input IP3 (-31dBm at 35dB gain, 3.4dBm at
-35dB gain).
Unlike similar devices, the MAX2306 family of receivers
includes dual oscillators and synthesizers to form a
self-contained IF subsystem. The synthesizer’s reference and RF dividers are fully programmable through a
3-wire serial bus, enabling dual-band system architectures using any common reference and IF frequency.
The differential baseband outputs have enough bandwidth 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-controlled oscillator (VCO) and synthesizer, the MAX2306
draws only 26mA from a +2.75V supply in CDMA (differential IF) mode.
The MAX2306/MAX2308/MAX2309 are available in 28pin Thin QFN and QFN packages.
Applications
Single/Dual/Triple-Mode CDMA Handsets
Globalstar Dual-Mode Handsets
Wireless Data Links
W-CDMA Handsets
Wireless Local Loop (WLL)
Features
♦ Complete IF Subsystem Includes VCO and
Synthesizer
♦ Supports Dual-Band, Triple-Mode Operation
♦ VGA with >110dB Gain Control
♦ Quadrature Demodulator
♦ High Output Level (2.7V)
♦ Programmable Charge-Pump Current
♦ Supports Any IF Frequency Between 40MHz and
300MHz
♦ 3-Wire Programmable Interface
♦ Low Supply Voltage (+2.7V)
MAX2306/MAX2308/MAX2309
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
________________________________________________________________ Maxim Integrated Products 1
19-2014; Rev 3; 8/04
EVALUATION KIT AVAILABLE
Pin Configurations appear at end of data sheet.
Block Diagram appears at end of data sheet.
Ordering Information
Selector Guide
*Exposed paddle
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PART MODE DESCRIPTION INPUT RANGE
AMPS,
MAX2306
MAX2308
MAX2309
Cellular CDMA,
PCS CDMA
AMPS,
Cellular CDMA,
PCS CDMA
External AMPS,
Cellular CDMA,
PCS CDMA
Dual Band, Triple Mode with Two
IF VCOs
Dual Band, Triple Mode with Common
IF VCO
Dual Band, Triple Mode (Drives External
AMPS Discriminator)
40MHz to 300MHz
70MHz to 300MHz
70MHz to 300MHz

MAX2306/MAX2308/MAX2309
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC= +2.7V to +3.6V, 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 V
CC
= +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 to +6.0V
SHDN to GND.............................................-0.3V to (V
CC
+ 0.3V)
STBY, BUFEN, MODE, EN, DATA,
CLK, DIVSEL ...........................................-0.3V to (V
CC
+ 0.3V)
VGC to GND...............-0.3V, the lesser of +4.2V or (V
CC
+ 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 (T
A
= +70°C)
28-Pin QFN (derate 28.5mW/°C above T
A
= +70°C)...........2W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
Supply Current
(Note 1)
I
CC
Addition for LO out (BUFEN = low) 3.5
mA
Shutdown Current I
CC
SHDN = low 1.5 10 µA
Register Shutdown Current I
CC
4 5.8 mA
Logic High 2.0 V
Logic Low 0.5 V
Logic High Input Current I
IH
2µA
Logic Low Input Current I
IL
2µA
VGC Control Input Current 0.5V < V
VGC
< 2.3V -5 5 µA
VGC Control Input Current
During Shutdown
SHDN = low 1 µA
Lock Indicator High (locked) 47kΩ load 2.0 V
Lock Indicator Low (unlocked) 47kΩ load 0.5 V
DC Offset Voltage I+ to I- and Q+ to Q-, PLL locked -20
mV
Common-Mode Output Voltage VCC = +2.75V
STANDBY (VCO_H)
STANDBY (VCO_L)
TA = -40°C to +85°C 41.5
TA = -40°C to +85°C 40.6
TA = -40°C to +85°C 39.5
T
= -40°C to +85°C 20.7
A
T
= -40°C to +85°C 20.3
A
25.9 37.5
25.4 36.7
24.7 35.7
12.3 18.8
11.4 18.4
±1.5 +20
VCC - 1.4

MAX2306/MAX2308/MAX2309
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS
(MAX2306/MAX2308/MAX2309 EV kit, VCC= +2.75V, registers set to default power-up states except M1 = M2 = 306, R1 = R2 = 16,
f
IN
= 183.7MHz, f
REF
= 19.2MHz, 0.6Vp-p synthesizer locked with passive 3rd-order lead-lag loop filter, SHDN = high, VGC set for
+35dB voltage gain, differential output load = 10kΩ, all power levels referred to 50Ω, T
A
= +25°C, unless otherwise noted.)
Input Frequency f
IN
(Note 2) 40 300
Reference Frequency f
REF
39
Frequency Reference Signal
Level
V
REF
0.2
SIGNAL PATH, CDMA MODE
Gain = -35dB, (Note 3) 3.4
Input 3rd-Order Intercept IIP3
Gain = +35dB, T
A
= -40°C to +85°C
(Notes 4, 5)
-38
Gain = -35dB -9
Input 1dB Compression P
1dB
Gain = +35dB -44
Input 0.25dB Desensitization (Note 6)
Gain = +35dB -49
Minimum Voltage Gain A
V
V
VGC
= 0.5V (Note 5) -56 -51 dB
Maximum Voltage Gain A
V
V
VGC
= 2.3V (Note 5) 57 61 dB
Gain = -35dB
DSB Noise Figure NF
Gain = +35dB
SIGNAL PATH, FM_IQ MODE
Gain = -35dB, (Note 7)
Input 3rd-Order Intercept IIP3
Gain = +35dB, T
A
= -40°C to +85°C
(Notes 5, 8)
Gain = -35dB -20
Input 1dB Compression P
1dB
Gain = +35dB -44
Minimum Voltage Gain A
V
V
VGC
= 0.5V (Note 5)
-52 dB
Maximum Voltage Gain A
V
V
VGC
= 2.3V (Note 5) 56
dB
SIGNAL PATH, CDMA AND FM_IQ MODE
Gain Variation Over Temperature
dB
Baseband 0.5dB Bandwidth 4.2
Quadrature Suppression TA = -40°C to +85°C (Note 5) 28 40 dB
LO to Baseband Leakage 1
Saturated Output Level V
SAT
Differential 2.7
(Note 2) 80 300
VCO Tune Range
LO_OUT Output Power P
LO
RL = 50Ω, BUFEN = low
256
VCO Maximum Divide Ratio
REF Minimum Divide Ratio
F
VCO_L
F
VCO_H
M1, M2
M1, M2 16383
R1, R2
-31.0
-40.2
135
-14.8
62.9
6.36
-6.5
-56.7
59.5
±2.5
-13.7

MAX2306/MAX2308/MAX2309
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
4 _______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2306/MAX2308/MAX2309 EV kit, VCC= +2.75V, registers set to default power-up states except M1 = M2 = 306, R1 = R2 = 16,
f
IN
= 183.7MHz, f
REF
= 19.2MHz, 0.6Vp-p synthesizer locked with passive 3rd-order lead-lag loop filter, SHDN = high, VGC set for
+35dB voltage gain, differential output load = 10kΩ, all power levels referred to 50Ω, T
A
= +25°C, unless otherwise noted.)
Note 1: FM_IQ and FM_I modes are not available on MAX2309.
Note 2: Recommended operating frequency range. Contact factory for operating frequency outside this range.
Note 3: f
1
= 183.7MHz, f2= 183.71MHz, Pf1= P
f2
= -15dBm.
Note 4: f
1
= 183.7MHz, f2= 183.71MHz, Pf1= P
f2
= -50dBm.
Note 5: Guaranteed by design.
Note 6: 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 7: f
1
= 183.7MHz, f2= 183.71MHz, Pf1= P
f2
= -23dBm.
Note 8: f
1
= 183.7MHz, f2= 183.71MHz, Pf1= P
f2
= -55dBm.
REF Maximum Divide Ratio
Minimum Phase Detector
Comparison Frequency
(Note 5) 20 kHz
Maximum Phase Detector
Comparison Frequency
(Note 5)
kHz
1kHz offset, TA = -40°C to +85°C
12.5kHz offset, TA = -40°C to +85°C
30kHz offset, TA = -40°C to +85°C
120kHz offset, TA = -40°C to +85°C
Phase Noise
900kHz offset, T
A
= -40°C to +85°C
TURBO LOCK
Acquisition, CPX = XX, TC =1
Locked, CPX = 00
Charge-Pump Source/Sink
Current
Locked, CPX = 11
µA
Charge-Pump Source/Sink
Matching
Locked, all values of CPX,
0.5V < V
CP
< VCC - 0.5V
0.2 10 %
SYMBOL
R1, R2 2047
MIN TYP MAX
1500
-79.6
-94.6
-105
-115.3
-125
1480 2100 2650
105
150
210
300
190
265
380
530

MAX2306/MAX2308/MAX2309
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
_______________________________________________________________________________________ 5
20.00
25.00
22.50
30.00
27.50
32.50
35.00
2.5 3.5 4.03.0 4.5 5.0 5.5
RECEIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2306/8/9 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
TA = +85°C
TA = +25°C
TA = -40°C
0
0.004
0.002
0.008
0.006
0.012
0.010
0.014
2.0 3.0 3.52.5 4.0 4.5 5.0 5.5
RECEIVE SHUTDOWN CURRENT vs.
SUPPLY VOLTAGE
MAX2306/8/9 toc02
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (mA)
TA = -40°C
TA = +25°C
TA = +85°C
-80
-60
-40
-20
0
20
40
60
80
0.5 1.0 1.5 2.0 2.5 3.0
GAIN vs. V
GC
MAX2306/8/9 toc03
VGC (V)
GAIN (dB)
TA = +25°C
TA = -40°C
TA = +85°C
15
25
20
35
30
40
45
55
50
60
0 100 200 300 400 500
GAIN vs. INPUT FREQUENCY
MAX2306/8/9 toc04
FREQUENCY (MHz)
GAIN (dB)
VGC = 2.5V
56.0
57.0
56.5
57.5
59.0
59.5
58.5
58.0
60.0
0 468102 1214161820
GAIN vs. BASEBAND FREQUENCY
MAX2306/8/9 toc05
FREQUENCY (MHz)
RELATIVE GAIN (dB)
-60
-40
-50
-20
-30
0
-10
10
-60 -20 0-40 20406080
THIRD-ORDER INPUT
INTERCEPT vs. GAIN
MAX2306/8/9 toc06
GAIN (dB)
IIP3 (dBm)
TA = -40°C
TA = +85°C
TA = +25°C
0
60
20
10
30
40
50
70
-40 -20 -10 0-30 10 20 5040 6030 70
NOISE FIGURE vs. GAIN
MAX2306/8/9 toc07
GAIN (dB)
NF (dB)
6.0
6.4
6.2
6.8
6.6
7.2
7.0
7.4
-40 0 20-20 406080100
NOISE FIGURE vs. TEMPERATURE
MAX2306/8/9 toc08
TEMPERATURE (°C)
NF (dB)
GAIN = 50dB
LOCK
VCO
VOLTAGE
VCO VOLTAGE vs. TIME
MAX2306/8/9 toc09
500µs/div
SHDN
LOCK TIME
1.83ms
1V/div
Typical Operating Characteristics
(MAX2306/MAX2308/MAX2309 EV kits, VCC= +2.75V, registers set to default power-up states, fIN= 183.7MHz, f
REF
= 19.2MHz,
synthesizer locked with passive 3rd-order lead-lag loop filter, SHDN = high, VGC set for +35dB voltage gain, differential output load
= 10kΩ, all power levels referred to 50Ω, T
A
= +25°C, unless otherwise noted.)

MAX2306/MAX2308/MAX2309
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
6 _______________________________________________________________________________________
500
1100
900
700
1300
1500
1700
1900
2100
2300
2500
0 200100 300 400 500 600
IF PORT PARALLEL RESISTANCE
vs. FREQUENCY
MAX2306/8/9 toc10
FREQUENCY (MHz)
EQUIVALENT PARELLEL RESISTANCE (Ω)
MEASURED DIFFERENTIALLY
CDMA PORT
FM PORT
MAX2306/8/9 toc12
-400
-380
-340
-360
-280
-260
-300
-320
-240
EQUIVALENT PARELLEL RESISTANCE (Ω)
80 240 320160 400 480 560
FREQUENCY (MHz)
TANK PORT PARALLEL RESISTANCE
vs. FREQUENCY
TANKH
TANKL
MEASURED DIFFERENTIALLY
0
0.2
0.1
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
MAX2306/8/9 toc13
FREQUENCY (MHz)
EQUIVALENT PARELLEL CAPACITANCE (pF)
80 160 240 320 400 400 560
TANK PORT PARALLEL CAPACITANCE
vs. FREQUENCY
TANK
TANKL
MEASURED DIFFERENTIALLY
Typical Operating Characteristics (continued)
(MAX2306/MAX2308/MAX2309 EV kits, VCC= +2.75V, registers set to default power-up states, fIN= 183.7MHz, f
REF
= 19.2MHz,
synthesizer locked with passive 3rd-order lead-lag loop filter, SHDN = high, VGC set for +35dB voltage gain, differential output load
= 10kΩ, all power levels referred to 50Ω, T
A
= +25°C, unless otherwise noted.)
LOOUT PORT
S11 vs. FREQUENCY
MAX2310 toc14
START: 10MHz
STOP: 600MHz
0.5
0.7
0.6
0.9
0.8
1.1
1.0
1.2
0 200 300100 400 500 600
MAX2306/8/9 toc11
FREQUENCY (MHz)
EQUIVALENT PARELLEL CAPACITANCE (pF)
IF PORT PARALLEL CAPACITANCE
vs. FREQUENCY
CDMA PORT
FM PORT
MEASURED DIFFERENTIALLY