MAXIM MAX2306, MAX2308, MAX2309 User Manual

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

PART

TEMP RANGE

PIN-PACKAGE

MAX2306EGI

28 QFN-EP*

MAX2306ETI

28 TQFN-EP*

MAX2308EGI

28 QFN-EP*

MAX2308ETI

28 TQFN-EP*

MAX2309EGI

28 QFN-EP*

MAX2309ETI

28 TQFN-EP*

-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

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

= +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

+ 0.3V)

STBY, BUFEN, MODE, EN, DATA,

CLK, DIVSEL ...........................................-0.3V to (V

+ 0.3V)

VGC to GND...............-0.3V, the lesser of +4.2V or (V

+ 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

= +70°C)

28-Pin QFN (derate 28.5mW/°C above T

= +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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

TA = +25°C

CDMA mode

TA = +25°C

FM_IQ mode

TA = +25°C

FM_I mode

TA = +25°C

Supply Current (Note 1)

Addition for LO out (BUFEN = low) 3.5

Shutdown Current I

SHDN = low 1.5 10 µA

4 5.8 mA Logic High 2.0 V Logic Low 0.5 V Logic High Input Current I

2µA

Logic Low Input Current I

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

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

= -40°C to +85°C 20.7

= -40°C to +85°C 20.3

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

= 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

= +25°C, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Frequency f

(Note 2) 40 300

MHz

Reference Frequency f

REF

MHz

Frequency Reference Signal Level

REF

0.2

Vp-p

SIGNAL PATH, CDMA MODE

Gain = -35dB, (Note 3) 3.4

Input 3rd-Order Intercept IIP3

Gain = +35dB, T

= -40°C to +85°C

(Notes 4, 5)

-38

dBm

Gain = -35dB -9

Input 1dB Compression P

1dB

Gain = +35dB -44

dBm

Gain = -35dB

Input 0.25dB Desensitization (Note 6)

Gain = +35dB -49

dBm

Minimum Voltage Gain A

VGC

= 0.5V (Note 5) -56 -51 dB

Maximum Voltage Gain A

VGC

= 2.3V (Note 5) 57 61 dB

Gain = -35dB

DSB Noise Figure NF

Gain = +35dB

dBm

SIGNAL PATH, FM_IQ MODE

Gain = -35dB, (Note 7)

Input 3rd-Order Intercept IIP3

Gain = +35dB, T

= -40°C to +85°C

(Notes 5, 8)

-32

dBm

Gain = -35dB -20

Input 1dB Compression P

1dB

Gain = +35dB -44

dBm

Minimum Voltage Gain A

VGC

= 0.5V (Note 5)

-52 dB

Maximum Voltage Gain A

VGC

= 2.3V (Note 5) 56

SIGNAL PATH, CDMA AND FM_IQ MODE

Gain Variation Over Temperature

Normalized to +25°C

Baseband 0.5dB Bandwidth 4.2

MHz

Quadrature Suppression TA = -40°C to +85°C (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

(Note 2) 80 300

VCO Tune Range

(Note 2)

600

MHz

LO_OUT Output Power P

RL = 50Ω, BUFEN = low

dBm

VCO Minimum Divide Ratio

256 VCO Maximum Divide Ratio REF Minimum Divide Ratio

VCO_L

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

= 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

= +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

= 183.7MHz, f2= 183.71MHz, Pf1= P

= -15dBm.

Note 4: f

= 183.7MHz, f2= 183.71MHz, Pf1= P

= -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

= 183.7MHz, f2= 183.71MHz, Pf1= P

= -23dBm.

Note 8: f

= 183.7MHz, f2= 183.71MHz, Pf1= P

= -55dBm.

PARAMETER

CONDITIONS

UNITS

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

= -40°C to +85°C

dBc/Hz

TURBO LOCK

Acquisition, CPX = XX, TC =1 Locked, CPX = 00

150

Locked, CPX = 01

210

Locked, CPX = 10

300

Charge-Pump Source/Sink Current

Locked, CPX = 11

425

µA

Charge-Pump Source/Sink Matching

Locked, all values of CPX,

0.5V < V

< 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

0.004

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

0.5 1.0 1.5 2.0 2.5 3.0

GAIN vs. V

MAX2306/8/9 toc03

VGC (V)

GAIN (dB)

TA = +25°C

TA = -40°C

TA = +85°C

25 20

35 30

55 50

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

-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

-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

= +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

0.2

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

= +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

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