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 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.
Applications
Single/Dual/Triple-Mode CDMA Handsets
Globalstar Dual-Mode Handsets
Wireless Data Links
W-CDMA Handsets
Wireless Local Loop (WLL)
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
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
________________________________________________________________ Maxim Integrated Products
1
19-2014; Rev 2; 7/01
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
PART
TEMP. RANGE
PIN-PACKAGE
MAX2306EGI
-40
C to +85C
28 QFN-EP*
MAX2308EGI
-40
C to +85C
28 QFN-EP*
MAX2309EGI
-40
C to +85C
28 QFN-EP*
PART
MODE
DESCRIPTION
INPUT RANGE
MAX2306
AMPS,
Cellular CDMA,
PCS CDMA
Dual Band, Triple Mode with Two
IF VCOs
40MHz to 300MHz
MAX2308
AMPS,
Cellular CDMA,
PCS CDMA
Dual Band, Triple Mode with Common
IF VCO
70MHz to 300MHz
MAX2309
External AMPS,
Cellular CDMA,
PCS CDMA
Dual Band, Triple Mode (Drives External
AMPS Discriminator)
70MHz to 300MHz
MAX2306/MAX2308/MAX2309
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +3.6V, MODE = DIVSEL = SHDN = STBY = BUFEN = high, differential output load = 10k
, T
A
= -40C to +85C,
registers set to default power-up settings. Typical values are at V
CC
= +2.75V and T
A
= +25C, 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.
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
= +70C)
28-Pin QFN (derate 28.5mW/C above T
A
= +70C) ...........2W
Operating Temperature Range ...........................-40C to +85C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +160C
Lead Temperature (soldering, 10s) .................................+300C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
T
A
= +25C
25.9
37.5
CDMA mode
T
A
= -40C to +85C
41.5
T
A
= +25C
25.4
36.7
FM_IQ mode
T
A
= -40C to +85C
40.6
T
A
= +25C
24.7
35.7
FM_I mode
T
A
= -40C to +85C
39.5
T
A
= +25C
12.3
18.8
STANDBY (VCO_H)
T
A
= -40C to +85C
20.7
T
A
= +25C
11.4
18.4
STANDBY (VCO_L)
T
A
= -40C to +85C
20.3
Supply Current
(Note 1)
I
CC
Addition for LO out (
BUFEN = low)
3.5
mA
Shutdown Current
I
CC
SHDN = low
1.5
10
A
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
2
A
Logic Low Input Current
I
IL
2
A
VGC Control Input Current
0.5V < V
VGC
< 2.3V
-5
5
A
VGC Control Input Current
During Shutdown
SHDN = low
1
A
Lock Indicator High (locked)
47k
load
2.0
V
Lock Indicator Low (unlocked)
47k
load
0.5
V
DC Offset Voltage
I+ to I- and Q+ to Q-, PLL locked
-20
1.5
+20
mV
Common-Mode Output Voltage
V
CC
= +2.75V
V
CC
- 1.4
V
MAX2306/MAX2308/MAX2309
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
_______________________________________________________________________________________
3
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 = 10k
, all power levels referred to 50, T
A
= +25C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Frequency
f
IN
(Note 2)
40
300
MHz
Reference Frequency
f
REF
39
MHz
Frequency Reference Signal
Level
V
REF
0.2
Vp-p
SIGNAL PATH, CDMA MODE
Gain = -35dB, (Note 3)
3.4
Input 3rd-Order Intercept
IIP3
Gain = +35dB, T
A
= -40C to +85C
(Notes 4, 5)
-38
-31.0
dBm
Gain = -35dB
-9
Input 1dB Compression
P
1dB
Gain = +35dB
-44
dBm
Gain = -35dB
-14.8
Input 0.25dB Desensitization
(Note 6)
Gain = +35dB
-49
dBm
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
62.9
DSB Noise Figure
NF
Gain = +35dB
6.36
dBm
SIGNAL PATH, FM_IQ MODE
Gain = -35dB, (Note 7)
-6.5
Input 3rd-Order Intercept
IIP3
Gain = +35dB, T
A
= -40C to +85C
(Notes 5, 8)
-40.2
-32
dBm
Gain = -35dB
-20
Input 1dB Compression
P
1dB
Gain = +35dB
-44
dBm
Minimum Voltage Gain
A
V
V
VGC
= 0.5V (Note 5)
-56.7
-52
dB
Maximum Voltage Gain
A
V
V
VGC
= 2.3V (Note 5)
56
59.5
dB
SIGNAL PATH, CDMA AND FM_IQ MODE
Gain Variation Over Temperature
Normalized to +25C
2.5
dB
Baseband 0.5dB Bandwidth
4.2
MHz
Quadrature Suppression
T
A
= -40C to +85C (Note 5)
28
40
dB
LO to Baseband Leakage
1
mVp-p
Saturated Output Level
V
SAT
Differential
2.7
Vp-p
PHASE-LOCKED LOOP
F
VCO
_
L
(Note 2)
80
300
VCO Tune Range
F
VCO
_
H
(Note 2)
135
600
MHz
LO_OUT Output Power
P
LO
R
L
= 50
, BUFEN = low
-13.7
dBm
VCO Minimum Divide Ratio
M1, M2
256
VCO Maximum Divide Ratio
M1, M2
16383
REF Minimum Divide Ratio
R1, R2
2
MAX2306/MAX2308/MAX2309
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
4
_______________________________________________________________________________________
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 = 10k
, all power levels referred to 50, T
A
= +25C, 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, f
2
= 183.71MHz, P
f1
= P
f2
= -15dBm.
Note 4:
f
1
= 183.7MHz, f
2
= 183.71MHz, P
f1
= 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, f
2
= 183.71MHz, P
f1
= P
f2
= -23dBm.
Note 8:
f
1
= 183.7MHz, f
2
= 183.71MHz, P
f1
= P
f2
= -55dBm.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
REF Maximum Divide Ratio
R1, R2
2047
Minimum Phase Detector
Comparison Frequency
(Note 5)
20
kHz
Maximum Phase Detector
Comparison Frequency
(Note 5)
1500
kHz
1kHz offset, T
A
= -40C to +85C
-79.6
12.5kHz offset, T
A
= -40C to +85C
-94.6
30kHz offset, T
A
= -40C to +85C
-105
120kHz offset, T
A
= -40C to +85C
-115.3
Phase Noise
900kHz offset, T
A
= -40C to +85C
-125
dBc/Hz
TURBO LOCK
Acquisition, CPX = XX, TC =1
1480
2100
2650
Locked, CPX = 00
105
150
190
Locked, CPX = 01
150
210
265
Locked, CPX = 10
210
300
380
Charge-Pump Source/Sink
Current
Locked, CPX = 11
300
425
530
A
Charge-Pump Source/Sink
Matching
Locked, all values of CPX,
0.5V < V
CP
< V
CC
- 0.5V
0.2
10
%
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
4.0
3.0
4.5
5.0
5.5
RECEIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2306/8/9 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
T
A
= +85
C
T
A
= +25
C
T
A
= -40
C
0
0.004
0.002
0.008
0.006
0.012
0.010
0.014
2.0
3.0
3.5
2.5
4.0
4.5
5.0
5.5
RECEIVE SHUTDOWN CURRENT vs.
SUPPLY VOLTAGE
MAX2306/8/9 toc02
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (mA)
T
A
= -40
C
T
A
= +25
C
T
A
= +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
V
GC
(V)
GAIN (dB)
T
A
= +25
C
T
A
= -40
C
T
A
= +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)
V
GC
= 2.5V
56.0
57.0
56.5
57.5
59.0
59.5
58.5
58.0
60.0
0
4
6
8
10
2
12 14 16 18 20
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
20
40
60
80
THIRD-ORDER INPUT
INTERCEPT vs. GAIN
MAX2306/8/9 toc06
GAIN (dB)
IIP3 (dBm)
T
A
= -40
C
T
A
= +85
C
T
A
= +25
C
0
60
20
10
30
40
50
70
-40
-20 -10 0
-30
10 20
50
40
60
30
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
40
60
80
100
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
500
s/div
SHDN
LOCK TIME
1.83ms
1V/div
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
= 10k
, all power levels referred to 50, T
A
= +25C, unless otherwise noted.)
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