MAXIM MAX2023 Technical data

General Description

The MAX2023 low-noise, high-linearity, direct upconver­sion/downconversion quadrature modulator/demodulator
is designed for single and multicarrier 1500MHz to
2300MHz DCS 1800/PCS 1900 EDGE, cdma2000

®

,
WCDMA, and PHS/PAS base-station applications.
Direct conversion architectures are advantageous
since they significantly reduce transmitter or receiver
cost, part count, and power consumption as compared
to traditional IF-based double-conversion systems.

In addition to offering excellent linearity and noise perfor­mance, the MAX2023 also yields a high level of compo­nent integration. This device includes two matched
passive mixers for modulating or demodulating in-phase
and quadrature signals, two LO mixer amplifier drivers,
and an LO quadrature splitter. On-chip baluns are also
integrated to allow for single-ended RF and LO connec­tions. As an added feature, the baseband inputs have
been matched to allow for direct interfacing to the trans­mit DAC, thereby eliminating the need for costly I/Q
buffer amplifiers.

The MAX2023 operates from a single +5V supply. It is
available in a compact 36-pin thin QFN package (6mm
x 6mm) with an exposed paddle. Electrical perfor­mance is guaranteed over the extended -40°C to
+85°C temperature range.

Applications

Single-Carrier DCS 1800/PCS 1900 EDGE Base
Stations

Single and Multicarrier WCDMA/UMTS Base
Stations

Single and Multicarrier cdmaOne™ and cdma2000
Base Stations

Predistortion Transmitters and Receivers

PHS/PAS Base Stations

Fixed Broadband Wireless Access

Military Systems

Microwave Links

Digital and Spread-Spectrum Communication
Systems

Video-on-Demand (VOD) and DOCSIS Compliant
Edge QAM Modulation

Cable Modem Termination Systems (CMTS)

Features

 1500MHz to 2300MHz RF Frequency Range
 Scalable Power: External Current-Setting

Resistors Provide Option for Operating Device in
Reduced-Power/Reduced-Performance Mode

 36-Pin, 6mm x 6mm TQFN Provides High Isolation

in a Small Package

Modulator Operation:
 Meets GSM Spurious Emission of -75dBc at

600kHz Offset at P

OUT

= +6dBm

 +23.5dBm Typical OIP3
 +61dBm Typical OIP2
 +16dBm Typical OP1dB
 -54dBm Typical LO Leakage
 48dBc Typical Sideband Suppression
 -165dBc/Hz Output Noise Density
 Broadband Baseband Input of 450MHz Allows a

Direct Launch DAC Interface, Eliminating the
Need for Costly I/Q Buffer Amplifiers

 DC-Coupled Input Allows Ability for Offset

Voltage Control

Demodulator Operation:

 +38dBm Typical IIP3
 +59dBm Typical IIP2
 +30dBm Typical IP1dB
 9.5dB Typical Conversion Loss
 9.6dB Typical NF
 0.025dB Typical I/Q Gain Imbalance
 0.56° I/Q Typical Phase Imbalance

MAX2023

High-Dynamic-Range, Direct Up-/Downconversion

1500MHz to 2300MHz Quadrature Mod/Demod

_______________________________________________________________________

Maxim Integrated Products

1

Ordering Information

19-0564; Rev 0; 7/06

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.

*

EP = Exposed paddle.

+

Denotes lead-free package.

T

= Tape-and-reel package.

cdma2000 is a registered trademark of Telecommunications
Industry Association.
cdmaOne is a trademark of CDMA Development Group.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE

MAX2023ETX -40°C to +85°C

MAX2023ETX-T -40°C to +85°C

MAX2023ETX+ -40°C to +85°C

MAX2023ETX+T -40°C to +85°C

PIN­PACKAGE

36 Thin QFN-EP*
(6mm x 6mm)

36 Thin QFN-EP*
(6mm x 6mm)

36 Thin QFN-EP*
(6mm x 6mm)

36 Thin QFN-EP*
(6mm x 6mm)

PKG

CODE

T3666-2

T3666-2

T3666-2

T3666-2

MAX2023

High-Dynamic-Range, Direct Up-/Downconversion
1500MHz to 2300MHz Quadrature Mod/Demod

2 ________________________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

VCC_ to GND ........................................................-0.3V to +5.5V

BBI+, BBI-, BBQ+, BBQ- to GND..................-4V to (V

CC

+ 0.3V)

LO, RF to GND Maximum Current ......................................30mA

RF Input Power ...............................................................+30dBm

Baseband Differential I/Q Input Power ..........................+20dBm

LO Input Power...............................................................+10dBm

RBIASLO1 Maximum Current .............................................10mA

RBIASLO2 Maximum Current .............................................10mA

RBIASLO3 Maximum Current .............................................10mA

θ

JA

(without air flow) ..........................................…………34°C/W

θ

JA

(2.5m/s air flow) .........................................................28°C/W

θ

JC

(junction to exposed paddle) ...................................8.5°C/W

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering 10s, leaded) .....................+245°C

Lead Temperature (soldering 10s, lead free) ..................+260°C

DC ELECTRICAL CHARACTERISTICS

(MAX2023

Typical Application Circuit

, VCC= +4.75V to +5.25V, GND = 0V, I/Q inputs terminated into 100Ω differential, LO input terminat-

ed into 50Ω, RF output terminated into 50Ω, 0V common-mode input, R1 = 432Ω, R2 = 562Ω, R3 = 300Ω, T

C

= -40°C to +85°C, unless

otherwise noted. Typical values are at V

CC

= +5V, TC= +25°C, unless otherwise noted.) (Note 1)

AC ELECTRICAL CHARACTERISTICS (Modulator)

(MAX2023

Typical Application Circuit

, when operated as a modulator, VCC= +4.75V to +5.25V, GND = 0V, I/Q differential inputs

driven from a 100Ω DC-coupled source, 0V common-mode input, 50Ω LO and RF system impedance, R1 = 432Ω, R2 = 562Ω,
R3 = 300Ω, T

C

= -40°C to +85°C. Typical values are at VCC= +5V, V

BBI

= V

BBQ

= 2.66V

P-P

differential, f

IQ

= 1MHz, PLO= 0dBm,

T

C

= +25°C, unless otherwise noted.) (Note 1)

Supply Voltage 4.75 5.00 5.25 V

Supply Current (Note 2) 255 295 345 mA

PARAMETER CONDITIONS MIN TYP MAX UNITS

BASEBAND INPUT

Baseb and Input Di fferential Impedance f

BB Common-Mode Input Voltage
Range

Baseband 0.5dB Bandwidth 450 MHz

LO INPUT

LO Input Frequency Range 1500 2300 MHz

LO Input Drive -3 +3 dBm

LO Input Return Loss 15 dB

RF OUTPUT

Output IP2

Output Power (Note 3) +5.6 dBm

PARAMETER CONDITIONS MIN TYP MAX UNITS

1dB

= 1MHz 55 Ω

I/Q

= V

V

BBI

P

OUT

= 1.8MHz,

f

BB1

f

= 1.9MHz

BB2

P

OUT

= 1850MHz

f

LO

CW tone

= 1V

BBQ

= 0dBm,

= 0dBm, f

differential ±3.5 V

P-P

= 1.8MHz, f

BB1

fLO = 1750MHz +24.2

fLO = 1850MHz +23.5Output IP3

= 1950MHz +22

f

LO

= 1.9MHz,

BB2

fLO = 1750MHz +15.9

fLO = 1850MHz +14.3Output P

= 1950MHz +12.5

f

LO

+61 dBm

dBm

dBm

MAX2023

High-Dynamic-Range, Direct Up-/Downconversion

1500MHz to 2300MHz Quadrature Mod/Demod

_________________________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS (Demodulator)

(MAX2023

Typical Application Circuit

when operated as a demodulator, VCC= +4.75V to +5.25V, GND = 0V, 50Ω LO and RF system

impedance, R1 = 432Ω, R2 = 562Ω, R3 = 300Ω, T

C

= -40°C to +85°C. Typical values are at VCC= +5V, PRF= 0dBm, fBB= 1MHz,

P

LO

= 0dBm, fLO= 1850MHz, TC= +25°C, unless otherwise noted.) (Note 1)

AC ELECTRICAL CHARACTERISTICS (Modulator) (continued)

(MAX2023

Typical Application Circuit

, when operated as a modulator, VCC= +4.75V to +5.25V, GND = 0V, I/Q differential inputs

driven from a 100Ω DC-coupled source, 0V common-mode input, 50Ω LO and RF system impedance, R1 = 432Ω, R2 = 562Ω,
R3 = 300Ω, T

C

= -40°C to +85°C. Typical values are at VCC= +5V, V

BBI

= V

BBQ

= 2.66V

P-P

differential, f

IQ

= 1MHz, PLO= 0dBm,

T

C

= +25°C, unless otherwise noted.) (Note 1)

Output Power Variation Over
Temperature

Output-Power Flatness

RF Return Loss fLO = 1850MHz 17 dB

Single Sideband Rejection

Spurious Emissions

Error Vector Magnitude EDGE input

Output Noise Density ( Note 4) -174 dBm/Hz

Output Noise Floor P

LO Leakage

= +5.6dBm, f

P

OUT

f

= 1850MHz, PRF flatness for fLO swept over

LO

±50MHz range

No external
calibration

= +6dBm, f

P

OUT

= 1850MHz, EDGE
input

= 0dBm (Note 5) -165 dBm/Hz

OUT

Un-nulled, baseband
inputs terminated in
50Ω

I/Q

LO

= 100kHz, TC = -40°C to +85°C 0.25 dB

fLO = 1750MHz 51

fLO = 1850MHz 48

f

= 1950MHz 48

LO

200kHz offset -37.2

400kHz offset -71.4

600kHz offset -84.7

1.2MHz offset -85

RMS 0.67

Peak 1.5

fLO = 1750MHz -59

fLO = 1850MHz -54

f

= 1950MHz -48

LO

0.2 dB

30kHz

dBc

dBc/

%

dBm

RF INPUT

RF Input Frequency 1500 2300 MHz

Conversion Loss fBB = 25MHz 9.5 dB

Noise Figure 9.6 dB

Noise Figure Underblocking
Conditions

Input Third-Order Intercept
Point

Input Second-Order Intercept
Point

Input 1dB Compression Point fBB = 25MHz 29.7 dBm

I/Q Gain Mismatch fBB = 1MHz 0.025 dB

I/Q Phase Mismatch fBB = 1MHz 0.56 Degrees

PARAMETER CONDITIONS MIN TYP MAX UNITS

f

BLOCKER

f

RF

f

RF1

P

RF

f

RF1

P

RF

= 1950MHz, P

= 1850MHz (Note 6)

= 1875MHz, f

= PLO = 0dBm, f

= 1875MHz, f

= PLO = 0dBm, f

BLOCKER

= 1876MHz, fLO = 1850MHz,

RF2

= 24MHz

IM3

= 1876MHz, f

RF2

= 51MHz

IM2

= +11dBm,

= 1850MHz,

LO

20.3 dB

38 dBm

59 dBm

MAX2023

High-Dynamic-Range, Direct Up-/Downconversion
1500MHz to 2300MHz Quadrature Mod/Demod

4 ________________________________________________________________________________________________

Typical Operating Characteristics

(MAX2023

Typical Application Circuit

, VCC= +4.75V to +5.25V, GND = 0V, I/Q differential inputs driven from a 100Ω DC-coupled source

(modulator), V

BBI

= V

BBQ

= 2.6V

P-P

differential (modulator), PRF= +6dBm (demodulator), I/Q differential output drives 50Ω differential load

(demodulator), 0V common-mode input/output, P

LO

= 0dBm, 1500MHz ≤ fLO≤ 2300MHz, 50Ω LO and RF system impedance, R1 = 432Ω,

R2 = 562Ω, R3 = 300Ω, T

C

= -40°C to +85°C. Typical values are at VCC= +5V, fLO= 1850MHz, TC= +25°C, unless otherwise noted.)

SUPPLY CURRENT vs. TEMPERATURE (TC)

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

MAX2023 toc01

-40 -15 10 35 60 85

200

220

240

260

280

300

320

340

360

380

400

VCC = 4.75V

VCC = 5.25V

VCC = 5V

MODULATOR SINGLE-SIDEBAND SUPPRESSION

vs. LO FREQUENCY

LO FREQUENCY (GHz)

SIDEBAND REJECTION (dBc)

MAX2023 toc02

1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3

20

25

30

35

40

45

50

55

60

65

70

PLO = -3dBm

PLO = 0dBm

PLO = +3dBm

MODULATOR SINGLE-SIDEBAND SUPPRESSION

vs. LO FREQUENCY

LO FREQUENCY (GHz)

SIDEBAND REJECTION (dBc)

MAX2023 toc03

1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3

20

25

30

35

40

45

50

55

60

65

70

VCC = 4.75V

VCC = 5V

VCC = 5.25V

MODULATOR SINGLE-SIDEBAND SUPPRESSION

vs. LO FREQUENCY

LO FREQUENCY (GHz)

SIDEBAND REJECTION (dBc)

MAX2023 toc04

1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3

20

25

30

35

40

45

50

55

60

65

70

TC = +85°C

TC = +25°C

TC = -40°C

MODULATOR OUTPUT IP3

vs. LO FREQUENCY

LO FREQUENCY (GHz)

OUTPUT IP3 (dBm)

MAX2023 toc05

1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3

10

12

14

16

18

20

22

24

26

28

30

TC = +85°C

TC = +25°C

TC = -40°C

f1 = 1.8MHz
f

2

= 1.9MHz

MODULATOR OUTPUT IP3

vs. LO FREQUENCY

LO FREQUENCY (GHz)

OUTPUT IP3 (dBm)

MAX2023 toc06

1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3

10

12

14

16

18

20

22

24

26

28

30

VCC = 4.75V, 5V, 5.25V

f1 = 1.8MHz
f

2

= 1.9MHz

Note 1: TCis the temperature on the exposed paddle.
Note 2: Guaranteed by production test.
Note 3: V

I/Q

= 2.66V

P-P

differential CW input.

Note 4: No baseband drive input. Measured with the baseband inputs terminated in 50Ω. At low output power levels, the output

noise density is equal to the thermal noise floor. See Output Noise Density vs. Output Power plots in

Typical Operating

Characteristics

.

Note 5: The output noise vs. P

OUT

curve has the slope of LO noise (Ln dBc/Hz) due to reciprocal mixing. Measured at 10MHz offset

from carrier.

Note 6: The LO noise (L = 10

(Ln/10)

), determined from the modulator measurements can be used to deduce the noise figure under-

blocking at operating temperature (T

P

in Kelvin), f

BLOCK

= 1 + (LCN- 1) TP/ TO+ LP

BLOCK

/ (1000kTO), where TO= 290K,

P

BLOCK

in mW, k is Boltzmann’s constant = 1.381 x 10

(-23)

J/K, and LCN= 10

(LC/10)

, LCis the conversion loss. Noise figure

underblocking in dB is NF

BLOCK

= 10 x log (f

BLOCK

). Refer to

Application Note 3632

.