19-2014; Rev 2; 7/01
E
AVAILABL
ATION KIT
EVALU
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
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 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 MAX2306
draws only 26mA from a +2.75V supply in CDMA (dif-
ferential IF) mode.
The MAX2306/MAX2308/MAX2309 are available in 28-
pin QFN packages.
Features
o
Complete IF Subsystem Includes VCO and
Synthesizer
o
Supports Dual-Band, Triple-Mode Operation
o
VGA with >110dB Gain Control
o
Quadrature Demodulator
o
High Output Level (2.7V)
o
Programmable Charge-Pump Current
o
Supports Any IF Frequency Between 40MHz and
300MHz
o
3-Wire Programmable Interface
o
Low Supply Voltage (+2.7V)
MAX2306/MAX2308/MAX2309
Ordering Information
PART
MAX2306EGI
MAX2308EGI
MAX2309EGI
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QFN-EP*
28 QFN-EP*
28 QFN-EP*
Applications
Single/Dual/Triple-Mode CDMA Handsets
Globalstar Dual-Mode Handsets
Wireless Data Links
W-CDMA Handsets
Wireless Local Loop (WLL)
*Exposed paddle
Pin Configurations appear at end of data sheet.
Block Diagram appears at end of data sheet.
Selector Guide
PART
MODE
AMPS,
Cellular CDMA,
PCS CDMA
AMPS,
Cellular CDMA,
PCS CDMA
External AMPS,
Cellular CDMA,
PCS CDMA
DESCRIPTION
Dual Band, Triple Mode with Two
IF VCOs
INPUT RANGE
MAX2306
40MHz to 300MHz
MAX2308
Dual Band, Triple Mode with Common
IF VCO
70MHz to 300MHz
MAX2309
Dual Band, Triple Mode (Drives External
AMPS Discriminator)
70MHz to 300MHz
________________________________________________________________
Maxim Integrated Products
1
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.
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
MAX2306/MAX2308/MAX2309
ABSOLUTE MAXIMUM RATINGS
V
CC
to 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
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.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +3.6V, MODE = DIVSEL =
SHDN
=
STBY
=
BUFEN
= high, differential output load = 10kΩ, T
A
= -40°C to +85°C,
registers set to default power-up settings. Typical values are at V
CC
= +2.75V and T
A
= +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CDMA mode
FM_IQ mode
Supply Current
(Note 1)
FM_I mode
STANDBY (VCO_H)
STANDBY (VCO_L)
CONDITIONS
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
3.5
1.5
4
2.0
0.5
I
IH
I
IL
0.5V < V
VGC
< 2.3V
SHDN
= low
47kΩ load
47kΩ load
I+ to I- and Q+ to Q-, PLL locked
V
CC
= +2.75V
-20
±1.5
V
CC
- 1.4
2.0
0.5
+20
-5
2
2
5
1
10
5.8
µA
mA
V
V
µA
µA
µA
µA
V
V
mV
V
11.4
12.3
24.7
25.4
MIN
TYP
25.9
MAX
37.5
41.5
36.7
40.6
35.7
39.5
18.8
20.7
18.4
20.3
mA
UNITS
I
CC
Addition for LO out (BUFEN = low)
Shutdown Current
Register Shutdown Current
Logic High
Logic Low
Logic High Input Current
Logic Low Input Current
VGC Control Input Current
VGC Control Input Current
During Shutdown
Lock Indicator High (locked)
Lock Indicator Low (unlocked)
DC Offset Voltage
Common-Mode Output Voltage
I
CC
I
CC
SHDN
= low
2
_______________________________________________________________________________________
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
AC ELECTRICAL CHARACTERISTICS
(MAX2306/MAX2308/MAX2309 EV kit, V
CC
= +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.)
PARAMETER
Input Frequency
Reference Frequency
Frequency Reference Signal
Level
SIGNAL PATH, CDMA MODE
Gain = -35dB, (Note 3)
Input 3rd-Order Intercept
IIP3
Gain = +35dB, T
A
= -40°C to +85°C
(Notes 4, 5)
Gain = -35dB
Gain = +35dB
(Note 6)
A
V
A
V
NF
Gain = -35dB
Gain = +35dB
57
-38
-9
-44
-14.8
-49
-56
61
62.9
6.36
-6.5
-40.2
-20
-44
-56.7
56
59.5
±2.5
4.2
T
A
= -40°C to +85°C (Note 5)
V
SAT
F
VCO
_
L
F
VCO
_
H
P
LO
M1, M2
M1, M2
R1, R2
16383
2
Differential
(Note 2)
(Note 2)
R
L
= 50Ω,
BUFEN
= low
80
135
-13.7
256
28
40
1
2.7
300
600
-52
-32
dBm
-51
3.4
-31.0
dBm
SYMBOL
f
IN
f
REF
V
REF
0.2
(Note 2)
CONDITIONS
MIN
40
TYP
MAX
300
39
UNITS
MHz
MHz
Vp-p
MAX2306/MAX2308/MAX2309
Input 1dB Compression
Input 0.25dB Desensitization
Minimum Voltage Gain
Maximum Voltage Gain
DSB Noise Figure
SIGNAL PATH, FM_IQ MODE
P
1dB
dBm
dBm
dB
dB
dBm
V
VGC
= 0.5V (Note 5)
V
VGC
= 2.3V (Note 5)
Gain = -35dB
Gain = +35dB
Gain = -35dB, (Note 7)
Input 3rd-Order Intercept
IIP3
Gain = +35dB, T
A
= -40°C to +85°C
(Notes 5, 8)
Gain = -35dB
Gain = +35dB
V
VGC
= 0.5V (Note 5)
V
VGC
= 2.3V (Note 5)
Normalized to +25°C
Input 1dB Compression
Minimum Voltage Gain
Maximum Voltage Gain
Gain Variation Over Temperature
Baseband 0.5dB Bandwidth
Quadrature Suppression
LO to Baseband Leakage
Saturated Output Level
PHASE-LOCKED LOOP
VCO Tune Range
LO_OUT Output Power
VCO Minimum Divide Ratio
VCO Maximum Divide Ratio
REF Minimum Divide Ratio
P
1dB
A
V
A
V
dBm
dB
dB
dB
MHz
dB
mVp-p
Vp-p
SIGNAL PATH, CDMA AND FM_IQ MODE
MHz
dBm
_______________________________________________________________________________________
3
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
MAX2306/MAX2308/MAX2309
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2306/MAX2308/MAX2309 EV kit, V
CC
= +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.)
PARAMETER
REF Maximum Divide Ratio
Minimum Phase Detector
Comparison Frequency
Maximum Phase Detector
Comparison Frequency
SYMBOL
R1, R2
(Note 5)
(Note 5)
1kHz offset, T
A
= -40°C to +85°C
12.5kHz offset, T
A
= -40°C to +85°C
Phase Noise
30kHz offset, T
A
= -40°C to +85°C
120kHz offset, T
A
= -40°C to +85°C
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 = 01
Locked, CPX = 10
Locked, CPX = 11
Charge-Pump Source/Sink
Matching
Locked, all values of CPX,
0.5V < V
CP
< V
CC
- 0.5V
1480
105
150
210
300
2100
150
210
300
425
0.2
2650
190
265
380
530
10
%
µA
1500
-79.6
-94.6
-105
-115.3
-125
dBc/Hz
CONDITIONS
MIN
2047
20
kHz
kHz
TYP
MAX
UNITS
FM_IQ and FM_I modes are not available on MAX2309.
Recommended operating frequency range. Contact factory for operating frequency outside this range.
f
1
= 183.7MHz, f
2
= 183.71MHz, P
f1
= P
f2
= -15dBm.
f
1
= 183.7MHz, f
2
= 183.71MHz, P
f1
= P
f2
= -50dBm.
Guaranteed by design.
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, f
2
= 183.71MHz, P
f1
= P
f2
= -23dBm.
Note 8:
f
1
= 183.7MHz, f
2
= 183.71MHz, P
f1
= P
f2
= -55dBm.
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
4
_______________________________________________________________________________________
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
Typical Operating Characteristics
(MAX2306/MAX2308/MAX2309 EV kits, V
CC
= +2.75V, registers set to default power-up states, f
IN
= 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.)
RECEIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2306/8/9 toc01
MAX2306/MAX2308/MAX2309
RECEIVE SHUTDOWN CURRENT vs.
SUPPLY VOLTAGE
MAX2306/8/9 toc02
GAIN vs. V
GC
60
40
GAIN (dB)
20
0
-20
T
A
= +25°C
T
A
= -40°C
T
A
= +85°C
MAX2306/8/9 toc03
35.00
32.50
SUPPLY CURRENT (mA)
T
A
= +85°C
30.00
27.50
25.00
22.50
20.00
2.5
3.0
3.5
4.0
4.5
5.0
T
A
= +25°C
0.014
0.012
SHUTDOWN CURRENT (mA)
0.010
0.008
T
A
= +25°C
0.006
0.004
0.002
0
T
A
= -40°C
2.0
2.5
3.0
3.5
4.0
4.5
5.0
T
A
= +85°C
80
T
A
= -40°C
-40
-60
-80
5.5
0.5
1.0
5.5
1.5
2.0
2.5
3.0
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
V
GC
(V)
GAIN vs. INPUT FREQUENCY
MAX2306/8/9 toc04
GAIN vs. BASEBAND FREQUENCY
MAX2306/8/9 toc05
THIRD-ORDER INPUT
INTERCEPT vs. GAIN
T
A
= -40°C
MAX2306/8/9 toc06
60
55
50
45
GAIN (dB)
40
35
30
25
20
15
0
100
200
300
400
V
GC
= 2.5V
60.0
59.5
RELATIVE GAIN (dB)
59.0
58.5
58.0
57.5
57.0
56.5
56.0
10
0
-10
IIP3 (dBm)
T
A
= +85°C
-20
-30
-40
-50
-60
T
A
= +25°C
500
0
2
4
6
8
10 12 14 16 18 20
-60
-40
-20
0
20
40
60
80
FREQUENCY (MHz)
FREQUENCY (MHz)
GAIN (dB)
NOISE FIGURE vs. GAIN
MAX2306/8/9 toc07
NOISE FIGURE vs. TEMPERATURE
GAIN = 50dB
MAX2306/8/9 toc08
VCO VOLTAGE vs. TIME
MAX2306/8/9 toc09
70
60
50
NF (dB)
40
30
20
10
7.4
7.2
7.0
NF (dB)
6.8
6.6
6.4
6.2
6.0
SHDN
VCO
VOLTAGE
1V/div
LOCK
LOCK TIME
1.83ms
0
-40 -30 -20 -10 0 10 20 30 40 50 60 70
GAIN (dB)
-40
-20
0
20
40
60
80
100
500µs/div
TEMPERATURE (°C)
_______________________________________________________________________________________
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