19-1507; Rev 2; 6/07
KIT
ATION
EVALU
BLE
AVAILA
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
General Description
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)
MAX2310/MAX2312/MAX2314/MAX2316
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.
Ordering Information
PART
MAX2310EEI
MAX2312EEI
MAX2314EEI
MAX2316EEI
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QSOP
28 QSOP
28 QSOP
28 QSOP
Applications
Single/Dual/Triple-Mode CDMA Handsets
Globalstar Dual-Mode Handsets
Wireless Data Links
Tetra Direct-Conversion Receivers
Wireless Local Loop (WLL)
Pin Configurations appear at end of data sheet.
Block Diagram appears at end of data sheet.
Selector Guide
PART
MAX2310
MAX2312
MAX2314
MODE
AMPS,
Cellular CDMA,
PCS CDMA
PCS CDMA
AMPS,
Cellular CDMA
Cellular CDMA
DESCRIPTION
Dual Band, Triple Mode
Single Band, Single Mode
Single Band, Dual Mode
Single Band, Single Mode or
Single Band, Dual Mode with
External Discriminator
INPUT RANGE
40MHz to 300MHz
67MHz to 300MHz
40MHz to 150MHz
MAX2316
40MHz to 150MHz
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim 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
MAX2310/MAX2312/MAX2314/MAX2316
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ..............................................................-0.3V, +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 QSOP (derate 10mW/°C above T
A
= +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, 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 +5.5V, 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
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
3
2.0
0.5
I
IH
I
IL
0.5V < V
VGC
< 2.3V
SHDN
= low
50kΩ load
50kΩ 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
11.5
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
Supply Current (Note 1)
I
CC
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
(MAX2310/MAX2314 or MAX2312/MAX2316 EV kit, V
CC
= +2.75V, registers set to default power-up states, f
IN
= 210.88MHz for
CDMA, f
IN
= 85.88MHz for FM, f
REF
= 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, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Input Frequency
Reference Frequency
Frequency Reference Signal
Level
SIGNAL PATH, CDMA MODE
Input Third-Order Intercept
Input 1dB Compression
Input 0.25dB Desensitization
Minimum Voltage Gain
Maximum Voltage Gain
DSB Noise Figure
SIGNAL PATH, FM_IQ MODE
Input Third-Order Intercept
Input 1dB Compression
Minimum Voltage Gain
Maximum Voltage Gain
Maximum Gain Variation
Over Temperature
Baseband 0.5dB Bandwidth
Quadrature Suppression
LO to Baseband Leakage
Saturated Output Level
PHASE-LOCKED LOOP
VCO Tune Range
LOOUT Output Power
f
VCO_L
f
VCO_H
P
LO
(Note 2)
R
L
= 50Ω,
BUFEN
= low
80
135
-13.7
300
600
MHz
dBm
V
SAT
Differential
T
A
= T
MIN
to T
MAX
(Note 6)
+28
IIP3
P
1dB
A
V
A
V
(Note 7)
(Notes 6, 8)
V
GC
= 0.5V (Note 6)
V
GC
= 2.3V (Note 6)
58.5
Gain = -35dB
Gain = +35dB
Gain = -35dB
Gain = +35dB
-20
-44
-6.0
-31
-16.2
-38.4
-50.2
63.4
-47.4
dBm
dBm
dB
dB
A
V
A
V
NF
IIP3
P
1dB
Gain = -35dB (Note 3)
Gain = +35dB (Note 4)
Gain = -35dB
Gain = +35dB
(Note 5)
V
GC
= 0.5V (Note 6)
V
GC
= 2.3V (Note 6)
Gain = -35dB
Gain = +35dB
56
Gain = -35dB
Gain = +35dB
-9
-44
1.7
-33.2
-6.4
-38.3
-14.8
-49
-54.8
61.3
62.9
6.36
-49
dBm
dBm
dBm
dB
dB
dB
SYMBOL
f
IN
f
REF
V
REF
(Note 2)
(Note 2)
0.2
CONDITIONS
MIN
40
TYP
MAX
300
39
UNITS
MHz
MHz
Vp-p
MAX2310/MAX2312/MAX2314/MAX2316
SIGNAL PATH, CDMA and FM_IQ MODE
Normalized to +25°C
±2.5
4.2
+35
1
2.7
dB
MHz
dB
mVp-p
Vp-p
_______________________________________________________________________________________
3
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
MAX2310/MAX2312/MAX2314/MAX2316
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2310/MAX2314 or MAX2312/MAX2316 EV kit, V
CC
= +2.75V, registers set to default power-up states, f
IN
= 210.88MHz for
CDMA, f
IN
= 85.88MHz for FM, f
REF
= 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, T
A
= +25°C, unless otherwise noted.)
PARAMETER
VCO Minimum Divide Ratio
VCO Maximum Divide Ratio
REF Minimum Divide Ratio
REF Maximum Divide Ratio
Minimum Phase Detector
Comparison Frequency
Maximum Phase Detector
Comparison Frequency
Base Band Spurious due to PLL
1kHz offset
12.5kHz offset
LOOUT at 85MHz,
VCO_L Enabled (Note 9)
30kHz offset
120kHz offset
900kHz offset
1kHz offset
12.5kHz offset
LOOUT at 210MHz,
VCO_H Enabled (Note 9)
30kHz offset
120kHz offset
900kHz offset
Acquisition, CPX = XX, TC = 1 (Note 10)
Locked, CPX = 00
Charge-Pump Source/Sink
Current
Locked, CPX = 01
Locked, CPX = 10
Locked, CPX = 11
Charge-Pump Source/Sink
Matching
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Locked, all values of CPX,
0.5V < V
CP
< V
CC
- 0.5V
1480
105
150
210
300
-72
-100
-110
-119
-125
-64
-91
-105
-115
-125
2100
150
210
300
425
0.2
2650
190
265
380
530
10
%
µA
dBc/Hz
dBc/Hz
SYMBOL
M1, M2
M1, M2
R1, R2
R1, R2
(Note 6)
(Note 6)
1500
-50
2047
20
kHz
kHz
dBc
16383
2
CONDITIONS
MIN
TYP
MAX
256
UNITS
FM_IQ and FM_I modes are not available on MAX2312 and MAX2316.
Recommended operating frequency range.
f
1
= 210.88MHz, f
2
= 210.89MHz, P
f1
= P
f2
= -15dBm.
f
1
= 210.88MHz, f
2
= 210.89MHz, P
f1
= P
f2
= -50dBm.
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.
Guaranteed by design and characterization.
f
1
= 85.88MHz, f
2
= 85.98MHz, P
f1
= P
f2
= -15dBm.
f
1
= 85.88MHz, f
2
= 85.98MHz, P
f1
= P
f2
= -50dBm.
Measured at LOOUT with BD = 0 (÷2 selected).
Not available on MAX2316.
4
_______________________________________________________________________________________
CDMA IF VGAs and I/Q Demodulators
with VCO and Synthesizer
Typical Operating Characteristics
(MAX2310/MAX2314 or MAX2312/MAX2316 EV kit, V
CC
= +2.75V, registers set to default power-up states, f
IN
= 210.88MHz for
CDMA, f
IN
= 85.88MHz for FM, f
REF
= 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, T
A
= +25°C, unless otherwise noted.)
RECEIVE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2310 toc01
MAX2310/MAX2312/MAX2314/MAX2316
RECEIVE SHUTDOWN CURRENT vs.
SUPPLY VOLTAGE
MAX2310 toc02
GAIN vs. V
GC
60
40
GAIN (dB)
20
0
-20
-40
T
A
= +25°C
T
A
= -40°C
T
A
= +85°C
NAX2310 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
-60
-80
5.5
0.5
1.0
1.5
2.0
2.5
3.0
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
V
GC
(V)
GAIN vs. INPUT FREQUENCY
MAX2310 toc04
GAIN vs. BASEBAND FREQUENCY
MAX2310 toc05
THIRD-ORDER INPUT
INTERCEPT vs. GAIN
T
A
= -40°C
MAX2310 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
10
0
-10
IIP3 (dBm)
58.5
58.0
57.5
T
A
= +85°C
-20
-30
-40
T
A
= +25°C
57.0
56.5
500
56.0
0
2
4
6
8
10 12 14 16 18 20
FREQUENCY (MHz)
-50
-60
-60
-40
-20
0
20
40
60
80
GAIN (dB)
FREQUENCY (MHz)
NOISE FIGURE vs. GAIN
MAX2310 toc07
NOISE FIGURE vs. TEMPERATURE
MAX2310 toc08
VCO VOLTAGE vs. TIME
MAX2310 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
-40
-20
0
20
40
60
80
SHDN
VCO
VOLTAGE
VOLTS (1V/div)
LOCK
LOCK TIME
1.83ms
0
-40 -30 -20 -10 0 10 20 30 40 50 60 70
GAIN (dB)
100
TIME (500μs/div)
TEMPERATURE (°C)
_______________________________________________________________________________________
5
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