Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX2023ETX+

General Description

The MAX2023 low-noise, high-linearity, direct upconver-

sion/downconversion quadrature modulator/demodulator

is designed for single and multicarrier 1500MHz to

2500MHz DCS 1800/PCS 1900 EDGE, cdma2000

WCDMA/LTE/TD-LTE, and PHS/PAS base-station appli-

cations. Direct conversion architectures are advanta-

geous 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 perfor-

mance, the MAX2023 also yields a high level of compo-

nent 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 connec-

tions. As an added feature, the baseband inputs have

been matched to allow for direct interfacing to the trans-

mit 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 TQFN package (6mm x

6mm) with an exposed pad. Electrical performance is

guaranteed over the extended -40°C to +85°C temper-

ature range.

Applications

Single-Carrier DCS 1800/PCS 1900 EDGE Base

Stations

Single and Multicarrier WCDMA/LTE/TD-LTE 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 2500MHz 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 2500MHz Quadrature Mod/Demod

Ordering Information

19-0564; Rev 1; 5/12

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.

PART TEMP RANGE PIN-PACKAGE

MAX2023ETX+ -40°C to +85°C

36 TQFN-EP*

(6mm x 6mm)

MAX2023ETX+T -40°C to +85°C

36 TQFN-EP*

(6mm x 6mm)

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

T = Tape and reel.

cdma2000 is a registered certification mark and registered service mark of the Telecommunications Industry Association.

cdmaOne is a trademark of CDMA Development Group.

EVALUATION KIT

AVAILABLE

Summary of content (18 pages)

PAGE 1
9-0564; Rev 1; 5/12 KIT ATION EVALU E L B AVAILA High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod Features The MAX2023 low-noise, high-linearity, direct upconversion/downconversion quadrature modulator/demodulator is designed for single and multicarrier 1500MHz to 2500MHz DCS 1800/PCS 1900 EDGE, cdma2000 ® , WCDMA/LTE/TD-LTE, and PHS/PAS base-station applications.
PAGE 2
MAX2023 High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod ABSOLUTE MAXIMUM RATINGS VCC_ to GND ........................................................-0.3V to +5.5V BBI+, BBI-, BBQ+, BBQ- to GND..................-4V to (VCC + 0.3V) LO, RF to GND Maximum Current ......................................30mA RF Input Power ...............................................................+30dBm Baseband Differential I/Q Input Power ..........................
PAGE 3
High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod (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 = 301Ω, TC = -40°C to +85°C. Typical values are at VCC = 5V, VBBI = VBBQ = 2.66VP-P differential, fIQ = 1MHz, fLO = 1850MHz, PLO = 0dBm, TC = +25°C, unless otherwise noted.
PAGE 4
MAX2023 High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod AC ELECTRICAL CHARACTERISTICS (Demodulator, LO = 1850MHz) (MAX2023 Typical Application Circuit when operated as a demodulator, VCC = 4.75V to 5.25V, GND = 0V, VDC for BBI+, BBI-, BBQ+, BBQ- = 0V, 50Ω LO and RF system impedance, R1 = 432Ω, R2 = 562Ω, R3 = 301Ω, TC = -40°C to +85°C. Typical values are at VCC = 5V, PRF = 0dBm, fBB = 1MHz, PLO = 0dBm, fLO = 1850MHz, TC = +25°C, unless otherwise noted.
PAGE 5
High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod (MAX2023 Typical Application Circuit when operated as a demodulator. I/Q outputs are recombined using network shown in Figure 5. Losses of combining network not included in measurements. RF and LO ports are driven from 50Ω sources. Typical values are for TC = +25°C, VCC = 5V, I/Q DC returns = 160Ω resistors to GND, PRF = 0dBm, PLO = 0dBm, fRF = 2140MHz, fLO = 2350MHz, fIF = 210MHz, unless otherwise noted.
PAGE 6
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), VBBI = VBBQ = 2.6VP-P differential (modulator), PRF = +6dBm (demodulator), I/Q differential output drives 50Ω differential load (demodulator), 0V common-mode input/output, PLO = 0dBm, 1500MHz ≤ fLO ≤ 2300MHz, 50Ω LO and RF system impedance, R1 = 432Ω, R2 = 562Ω, R3 = 301Ω, TC = -40°C to +85°C.
PAGE 7
High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod PLO = +3dBm PLO = -3dBm 18 80 16 24.5 24.0 23.5 10 65 60 TC = -40°C 2.2 2.3 -3.5 -2.5 -1.5 -0.5 0.5 1.5 2.5 I/Q COMMON-MODE VOLTAGE (V) MODULATOR OUTPUT IP2 vs. LO FREQUENCY 1.5 3.5 75 PLO = 0dBm 75 68 67 65 60 OUTPUT IP2 (dBm) OUTPUT IP2 (dBm) VCC = 5V 70 65 PLO = +3dBm 60 55 f1 = 1.8MHz f2 = 1.9MHz 50 f1 = 1.8MHz f2 = 1.9MHz 2.2 2.3 MODULATOR OUTPUT POWER vs. INPUT POWER 20 16 VCC = 4.
PAGE 8
Typical Operating Characteristics (continued) (MAX2023 Typical Application Circuit, VCC = 4.75V to 5.25V, GND = 0V, I/Q differential inputs driven from a 100Ω DC-coupled source (modulator), VBBI = VBBQ = 2.6VP-P differential (modulator), PRF = +6dBm (demodulator), I/Q differential output drives 50Ω differential load (demodulator), 0V common-mode input/output, PLO = 0dBm, 1500MHz ≤ fLO ≤ 2300MHz, 50Ω LO and RF system impedance, R1 = 432Ω, R2 = 562Ω, R3 = 301Ω, TC = -40°C to +85°C.
PAGE 9
High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod DEMODULATOR I/Q PHASE IMBALANCE vs. LO FREQUENCY TC = +85°C 65 60 TC = -40°C PLO = +3dBm 3 PLO = 0dBm 2 PLO = -3dBm 1 f1 = fLO + 25MHz f2 = fLO + 26MHz 55 4 PLO = -6dBm 1.7 1.8 1.9 2.0 2.1 LO FREQUENCY (GHz) 2.2 1.5 2.3 1.6 1.7 1.8 1.9 2.0 2.1 LO FREQUENCY (GHz) 2.2 PLO = -3dBm PLO = -6dBm 22 PLO = -3dBm 0.02 PLO = 0dBm 1.5 1.6 1.7 1.8 1.9 2.0 2.
PAGE 10
MAX2023 High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod Pin Description PIN NAME 1, 5, 9–12, 14, 16–19, 22, 24, 27–30, 32, 34, 35, 36 2 3 4 6 7 8 13 15 20 21 23 25 26 31 33 EP GND FUNCTION Ground RBIASLO3 3rd LO Amplifier Bias. Connect a 301 resistor to ground. LO Input Buffer Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1μF VCCLOA capacitors as close as possible to the pin. LO Local Oscillator Input. 50 input impedance.
PAGE 11
High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod The I and Q signals directly modulate the 0° and 90° LO signals and are upconverted to the RF frequency. The outputs of the I and Q mixers are combined through a balun to produce a singled-ended RF output. Applications Information LO Input Drive The LO input of the MAX2023 is internally matched to 50Ω, and requires a single-ended drive at a 1500MHz to 2500MHz frequency range.
PAGE 12
MAX2023 High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod MAX5873 DUAL DAC MAX4395 QUAD AMP MAX2021/MAX2023 MAX2058/MAX2059 RF DIGITAL VGAs I 12 0° 90° 31dB ∑ 17dB 31dB RFOUT Q SPI LOGIC 12 MAX9491 VCO + SYNTH 45, 80, OR 95MHz LO LOOPBACK Rx OFF OUT (FEEDS BACK INTO Rx CHAIN FRONT-END) SPI CONTROL Figure 2.
PAGE 13
High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod LO leakage at the RF port can be nulled to a level less than -80dBm by introducing DC offsets at the I and Q ports. However, this null at the RF port can be compromised by an improperly terminated I/Q IF interface. Care must be taken to match the I/Q ports to the driving DAC circuitry.
PAGE 14
MAX2023 High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod downconverter is optimized for high linearity and excellent noise performance, typically with a +38dBm IIP3, an input P1dB of +29.7dBm, and a 9.6dB noise figure. A wide I/Q port bandwidth allows the port to be used as an image-reject mixer for downconversion to a quadrature IF frequency. The RF and LO inputs are internally matched to 50Ω.
PAGE 15
High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod Typical values for Ca, Ra, La, and Cb would be 1.5pF, 50Ω, 11nH, and 4.7pF, respectively. These values can change depending on the LO, RF, and IF frequencies used. Resistor Rb is in the 50Ω to 200Ω range. The circuitry presented in Figure 6 does not allow for LO Leakage at RF port nulling.
PAGE 16
High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod GND GND VCCLOQ1 GND VCCLOQ2 GND GND GND 36 35 34 33 32 31 30 29 28 1 5 RBIASLO1 6 N.C.
PAGE 17
High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod + VCC C1 22pF C3 8pF LO VCCLOA LO GND RBIASLO1 R1 432Ω N.C. RBIASLO2 R2 562Ω GND 35 33 VCCLOQ2 GND 34 GND 32 GND GND 30 31 1 GND 28 29 27 MAX2023 BIAS LO3 2 26 3 25 90° 4 24 0° 5 Σ BIAS LO1 6 22 7 21 BIAS LO2 8 20 EP 9 19 10 GND VCC GND BBQ+ BBQ- Q+ QC9 2pF GND RF 23 RF C5 0.1μF 11 GND 12 GND 13 14 GND 15 VCCLOI2 RBIASLO3 36 VCCLOI1 GND C2 0.
PAGE 18
MAX2023 High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod Revision History REVISION NUMBER REVISION DATE 0 7/06 Initial release 5/12 Updated General Description section and Applications section to reflect to FR frequency range.