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_______________________________________________________________ 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.

SiGe, High-Linearity, 2300MHz to 4000MHz

Downconversion Mixer with LO Buffer

MAX19998

19-4827; Rev 0; 10/09

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

*EP = Exposed pad.

T = Tape and reel.

General Description

The MAX19998 single, high-linearity downconversion

mixer provides 8.7dB of conversion gain, +24.3dBm

input IP3, +11.3dBm 1dB input compression point,

and a noise figure of 9.7dB for 2300MHz to 4000MHz

WiMAXK, LTE, and MMDS receiver applications. With

an ultra-wide LO 2600MHz to 4300MHz frequency

range, the MAX19998 can be used in either low-side

or high-side LO injection architectures for virtually all

2.5GHz and 3.5GHz applications. For a 2.5GHz vari-

ant tuned specifically for high-side injection, refer to the

MAX19996A.

In addition to offering excellent linearity and noise per-

formance, the MAX19998 also yields a high level of

component integration. This device includes a double-

balanced passive mixer core, an IF amplifier, and an LO

buffer. On-chip baluns are also integrated to allow for

single-ended RF and LO inputs. The MAX19998 requires

a nominal LO drive of 0dBm, and supply current is typi-

cally 230mA at V

= 5.0V or 150mA at V

= 3.3V.

The MAX19998 is pin compatible with the MAX19996/

MAX19996A 2000MHz to 3900MHz mixer family. The

device is also pin similar with the MAX9984/MAX9986/

MAX9986A 400MHz to 1000MHz mixers and the

MAX9993/MAX9994/MAX9996 1700MHz to 2200MHz

mixers, making this entire family of downconverters ideal

for applications where a common PCB layout is used for

multiple frequency bands.

The MAX19998 is available in a compact, 5mm x 5mm,

20-pin thin QFN with an exposed pad. Electrical perfor-

mance is guaranteed over the extended -40NC to +85NC

temperature range.

Applications

2.5GHz WiMAX and LTE Base Stations

2.7GHz MMDS Base Stations

3.5GHz WiMAX and LTE Base Stations

Fixed Broadband Wireless Access

Wireless Local Loop

Private Mobile Radios

Military Systems

Features

S 2300MHz to 4000MHz RF Frequency Range

S 2600MHz to 4300MHz LO Frequency Range

S 50MHz to 500MHz IF Frequency Range

S 8.7dB Conversion Gain

S 9.7dB Noise Figure

S +24.3dBm Typical Input IP3

S +11.3dBm Typical Input 1dB Compression Point

S 67dBc Typical 2RF - 2LO Spurious Rejection at

= -10dBm

S Integrated LO Buffer

S Integrated RF and LO Baluns for Single-Ended

Inputs

S Low -3dBm to +3dBm LO Drive

S Pin Compatible with the MAX19996/MAX19996A

2000MHz to 3900MHz Mixers

S Pin Similar with the MAX9984/MAX9986/

MAX9986A Series of 400MHz to 1000MHz Mixers

and the MAX9993/MAX9994/MAX9996 Series of

1700MHz to 2200MHz Mixers

S Single 5.0V or 3.3V Supply

S External Current-Setting Resistors Provide Option

for Operating Device in Reduced-Power/Reduced-

Performance Mode

WiMAX is a trademark of WiMAX Forum.

Ordering Information

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX19998ETP+

-40NC to +85NC

20 Thin QFN-EP*

MAX19998ETP+T

-40NC to +85NC

20 Thin QFN-EP*

Summary of content (28 pages)

PAGE 1
9-4827; Rev 0; 10/09 TION KIT EVALUA BLE AVAILA SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer Features The MAX19998 single, high-linearity downconversion mixer provides 8.7dB of conversion gain, +24.3dBm input IP3, +11.3dBm 1dB input compression point, and a noise figure of 9.7dB for 2300MHz to 4000MHz WiMAXK, LTE, and MMDS receiver applications.
PAGE 2
MAX19998 SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer ABSOLUTE MAXIMUM RATINGS VCC to GND...........................................................-0.3V to +5.5V IF+, IF-, LOBIAS, IFBIAS to GND.............. -0.3V to (VCC + 0.3V) RF, LO Input Power........................................................ +12dBm RF, LO Current (RF and LO is DC shorted to GND through balun).........50mA Continuous Power Dissipation (Note 1)..................................
PAGE 3
SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer (Typical Application Circuit, with tuning elements outlined in Table 1, R1 = 698ω, R2 = 604ω, VCC = 4.75V to 5.25V, RF and LO ports are driven from 50I sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 3100MHz to 3900MHz, fIF = 300MHz, fLO = 2800MHz to 3600MHz, fRF > fLO, TC = -40NC to +85NC. Typical values are for TC = +25NC, VCC = 5.0V, PRF = -5dBm, PLO = 0dBm, fRF = 3500MHz, fLO = 3200MHz, fIF = 300MHz.
PAGE 4
MAX19998 SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer 5.0V SUPPLY AC ELECTRICAL CHARACTERISTICS—fRF = 3100MHz to 3900MHz, LOW-SIDE LO INJECTION (continued) (Typical Application Circuit, with tuning elements outlined in Table 1, R1 = 698ω, R2 = 604ω, VCC = 4.75V to 5.25V, RF and LO ports are driven from 50I sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 3100MHz to 3900MHz, fIF = 300MHz, fLO = 2800MHz to 3600MHz, fRF > fLO, TC = -40NC to +85NC.
PAGE 5
SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer (Typical Application Circuit, with tuning elements outlined in Table 1, R1 = 845ω, R2 = 1.1kω, RF and LO ports are driven from 50I sources, fRF > fLO. Typical values are for TC = +25NC, VCC = 3.3V, PRF = -5dBm, PLO = 0dBm, fRF = 3500MHz, fLO = 3200MHz, fIF = 300MHz, unless otherwise noted.
PAGE 6
MAX19998 SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer 5.0V SUPPLY AC ELECTRICAL CHARACTERISTICS—fRF = 3100MHz to 3900MHz, HIGH-SIDE LO INJECTION (continued) (Typical Application Circuit, with tuning elements outlined in Table 1, R1 = 698ω, R2 = 604ω, VCC = 4.75V to 5.25V, RF and LO ports are driven from 50I sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 3100MHz to 3900MHz, fIF = 300MHz, fLO = 3400MHz to 4200MHz, fRF < fLO, TC = -40NC to +85NC.
PAGE 7
SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer (Typical Application Circuit, with tuning elements outlined in Table 1, R1 = 698ω, R2 = 604ω, VCC = 4.75V to 5.25V, RF and LO ports are driven from 50I sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 2300MHz to 2900MHz, fIF = 300MHz, fLO = 2600MHz to 3200MHz, fRF < fLO, TC = -40NC to +85NC. Typical values are for TC = +25NC, VCC = 5.0V, PRF = -5dBm, PLO = 0dBm, fRF = 2600MHz, fLO = 2900MHz, fIF = 300MHz, unless otherwise noted.
PAGE 8
Typical Operating Characteristics (Typical Application Circuit with tuning elements outlined in Table 1, VCC = 5.0V, fRF = 3100MHz to 3900MHz, LO is low-side injected for a 300MHz IF, PRF = -5dBm, PLO = 0dBm, TC = +25NC, unless otherwise noted.) TC = +85°C 7 8 PLO = -3dBm, 0dBm, +3dBm 7 6 3400 3600 3800 4000 3200 RF FREQUENCY (MHz) 3600 3800 4000 3000 24 25 24 23 3400 3600 3800 4000 3800 VCC = 5.25V PLO = -3dBm, 0dBm, +3dBm 25 24 VCC = 5.0V VCC = 4.
PAGE 9
SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer TC = -40°C, +25°C, +85°C 65 55 75 PLO = -3dBm, 0dBm, +3dBm 65 55 3400 3600 3800 4000 VCC = 4.75V, 5.0V, 5.25V 65 3200 3400 3600 3800 4000 3000 3200 RF FREQUENCY (MHz) NOISE FIGURE vs. RF FREQUENCY NOISE FIGURE vs. RF FREQUENCY TC = +85°C TC = +25°C 8 3800 4000 NOISE FIGURE vs.
PAGE 10
Typical Operating Characteristics (continued) (Typical Application Circuit with tuning elements outlined in Table 1, VCC = 5.0V, fRF = 3100MHz to 3900MHz, LO is low-side injected for a 300MHz IF, PRF = -5dBm, PLO = 0dBm, TC = +25NC, unless otherwise noted.) LO LEAKAGE AT IF PORT vs. LO FREQUENCY TC = +85°C -20 TC = +25°C TC = -40°C -40 2900 3100 3300 3500 3700 -40 2700 2900 3100 3300 3500 3700 2700 2900 3100 3300 3500 LO FREQUENCY (MHz) RF-TO-IF ISOLATION vs.
PAGE 11
SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer 2LO LEAKAGE AT RF PORT vs. LO FREQUENCY TC = +85°C -40 -50 -30 -40 PLO = -3dBm, 0dBm, +3dBm -50 3000 3500 4000 -30 -40 VCC = 4.75V, 5.0V, 5.25V -50 3000 2500 LO FREQUENCY (MHz) 3500 4000 3000 2500 LO FREQUENCY (MHz) 20 30 0 IF PORT RETURN LOSS (dB) fIF = 300MHz 10 4000 IF PORT RETURN LOSS vs. IF FREQUENCY MAX19998 toc31 0 3500 LO FREQUENCY (MHz) RF PORT RETURN LOSS vs.
PAGE 12
Typical Operating Characteristics (continued) (Typical Application Circuit with tuning elements outlined in Table 1, VCC = 3.3V, fRF = 3100MHz to 3900MHz, LO is low-side injected for a 300MHz IF, PRF = -5dBm, PLO = 0dBm, TC = +25NC, unless otherwise noted.) TC = +85NC 6 8 PLO = -3dBm, 0dBm, +3dBm 7 6 3400 3600 3800 4000 3200 RF FREQUENCY (MHz) TC = +85NC 20 TC = +25NC 3600 3800 4000 TC = -40NC 18 3600 3800 VCC = 3.3V PRF = -5dBm/TONE 20 PLO = -3dBm, 0dBm, +3dBm 4000 3800 21 VCC = 3.
PAGE 13
SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer TC = -40°C, +25°C, +85°C 55 65 60 PLO = -3dBm, 0dBm, +3dBm 55 50 3400 3600 3800 4000 3200 RF FREQUENCY (MHz) NOISE FIGURE vs. RF FREQUENCY TC = -40NC 3600 3800 4000 VCC = 3.6V 3000 MAX19998 toc47 VCC = 3.3V 11 3200 10 9 3600 3800 4000 9 7 3000 3200 RF FREQUENCY (MHz) INPUT P1dB vs. RF FREQUENCY 4000 3000 3200 TC = +25NC 3400 3600 3800 4000 RF FREQUENCY (MHz) VCC = 3.
PAGE 14
Typical Operating Characteristics (continued) (Typical Application Circuit with tuning elements outlined in Table 1, VCC = 3.3V, fRF = 3100MHz to 3900MHz, LO is low-side injected for a 300MHz IF, PRF = -5dBm, PLO = 0dBm, TC = +25NC, unless otherwise noted.) -30 TC = -40°C, +25°C, +85°C -40 -50 -30 PLO = -3dBm, 0dBm, +3dBm -40 -50 2900 3100 3300 3500 3700 -30 VCC = 3.0V VCC = 3.
PAGE 15
SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer 2LO LEAKAGE AT RF PORT vs. LO FREQUENCY TC = -40NC -30 TC = +85NC -10 -20 -30 PLO = -3dBm, 0dBm, +3dBm -40 -50 VCC = 3.0V -30 VCC = 3.3V -40 3500 4000 -50 2500 3000 LO FREQUENCY (MHz) 3500 4000 2500 3000 LO FREQUENCY (MHz) 3500 4000 LO FREQUENCY (MHz) RF PORT RETURN LOSS vs. RF FREQUENCY IF PORT RETURN LOSS vs. IF FREQUENCY 0 MAX19998 toc65 0 VCC = 3.
PAGE 16
Typical Operating Characteristics (continued) (Typical Application Circuit with tuning elements outlined in Table 1, VCC = 5.0V, fRF = 3100MHz to 3900MHz, LO is high-side injected for a 300MHz IF, PRF = -5dBm, PLO = 0dBm, TC = +25NC, unless otherwise noted.
PAGE 17
SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer TC = +25°C TC = -40°C 65 55 75 PLO = -3dBm, 0dBm, +3dBm 65 55 3200 3400 3600 3800 4000 3200 RF FREQUENCY (MHz) NOISE FIGURE vs. RF FREQUENCY 3400 3600 3800 VCC = 4.75V, 5.0V, 5.25V 65 4000 3000 3200 NOISE FIGURE vs. RF FREQUENCY TC = +25°C 11 8 3600 3800 4000 NOISE FIGURE vs.
PAGE 18
Typical Operating Characteristics (continued) (Typical Application Circuit with tuning elements outlined in Table 1, VCC = 5.0V, fRF = 3100MHz to 3900MHz, LO is high-side injected for a 300MHz IF, PRF = -5dBm, PLO = 0dBm, TC = +25NC, unless otherwise noted.) LO LEAKAGE AT IF PORT vs.
PAGE 19
SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer 2LO LEAKAGE AT RF PORT vs. LO FREQUENCY -20 PLO = -3dBm -30 PLO = 0dBm -40 -40 3800 4050 3800 4050 4300 3550 3300 LO FREQUENCY (MHz) LO FREQUENCY (MHz) 20 0 fLO = 4100MHz IF PORT RETURN LOSS (dB) fIF = 300MHz 10 4050 4300 IF PORT RETURN LOSS vs. IF FREQUENCY MAX19998 toc99 0 3800 LO FREQUENCY (MHz) RF PORT RETURN LOSS vs. RF FREQUENCY 30 VCC = 4.75V, 5.0V, 5.
PAGE 20
Typical Operating Characteristics (continued) (Typical Application Circuit with tuning elements outlined in Table 1, VCC = 5.0V, fRF = 2300MHz to 2900MHz, LO is high-side injected for a 300MHz IF, PRF = -5dBm, PLO = 0dBm, TC = +25NC, unless otherwise noted.) 8 8 PLO = -3dBm, 0dBm, +3dBm 2750 2900 RF FREQUENCY (MHz) INPUT IP3 vs. RF FREQUENCY 2600 2750 2900 2300 26 25 PLO = -3dBm, 0dBm, +3dBm 24 TC = -40°C 23 2450 2600 2750 2900 26 25 VCC = 5.0V 24 VCC = 4.
PAGE 21
SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer TC = +25NC TC = -40NC 65 55 75 PLO = -3dBm, 0dBm, +3dBm 65 55 2600 2750 2900 TC = +25NC 10 TC = -40NC 2600 2750 2900 2300 11 2600 2750 PLO = -3dBm, 0dBm, +3dBm 10 2900 12 2450 2600 2750 2900 12 9 2750 RF FREQUENCY (MHz) 2900 2600 2750 2900 INPUT P1dB vs. RF FREQUENCY 11 PLO = -3dBm, 0dBm, +3dBm 13 VCC = 5.25V VCC = 5.0V 12 11 VCC = 4.
PAGE 22
Typical Operating Characteristics (continued) (Typical Application Circuit with tuning elements outlined in Table 1, VCC = 5.0V, fRF = 2300MHz to 2900MHz, LO is high-side injected for a 300MHz IF, PRF = -5dBm, PLO = 0dBm, TC = +25NC, unless otherwise noted.) TC = +25°C TC = +85°C -30 TC = -40°C -40 -30 PLO = -3dBm, 0dBm, +3dBm 2750 2900 3050 3200 VCC = 4.75V, 5.0V, 5.25V -40 2600 2750 2900 3050 3200 2600 2750 2900 3050 LO FREQUENCY (MHz) RF-TO-IF ISOLATION vs.
PAGE 23
SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer 2LO LEAKAGE AT RF PORT vs. LO FREQUENCY TC = +85NC -50 -60 PLO = +3dBm -40 PLO = 0dBm -50 PLO = -3dBm -60 3000 3500 4000 VCC = 4.75V -40 VCC = 5.25V -50 3500 4000 3000 2500 LO FREQUENCY (MHz) 20 30 0 fLO = 3000MHz IF PORT RETURN LOSS (dB) fIF = 300MHz 4000 IF PORT RETURN LOSS vs. IF FREQUENCY MAX19998 toc133 0 3500 LO FREQUENCY (MHz) RF PORT RETURN LOSS vs. RF FREQUENCY 10 VCC = 5.
PAGE 24
MAX19998 SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer VCC 1 RF 2 GND IF+ IF- GND LEXT TOP VIEW IFBIAS Pin Configuration/Functional Diagram 20 19 18 17 16 15 GND 14 VCC 3 13 GND GND 4 12 GND GND 5 11 LO MAX19998 6 7 8 9 10 VCC LOBIAS VCC GND GND EP Pin Description PIN NAME 1, 6, 8, 14 VCC FUNCTION 2 RF 3, 9, 13, 15 GND Ground. Not internally connected. Pins can be grounded. 4, 5, 10, 12, 17 GND Ground.
PAGE 25
SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer The MAX19998 provides high linearity and low noise figure for a multitude of 2300MHz to 4000MHz WiMAX, LTE, and MMDS base-station applications. This device operates over a 2600MHz to 4300MHz LO range and a 50MHz to 500MHz IF range. Integrated baluns and matching circuitry allow 50I single-ended interfaces to the RF and LO ports.
PAGE 26
MAX19998 SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer LEXT Inductor Short LEXT to ground using a 0I resistor. For applications requiring improved RF-to-IF and LO-to-IF isolation, L3 can be changed to optimize performance (see the Typical Operating Characteristics). However, the load impedance presented to the mixer must be such that any capacitances from IF- and IF+ to ground do not exceed several picofarads to ensure stable operating conditions.
PAGE 27
SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer heat from the EP. In addition, provide the EP with a lowinductance path to electrical ground. The EP MUST be soldered to a ground plane on the PCB, either directly or through an array of plated via holes.
PAGE 28
MAX19998 SiGe, High-Linearity, 2300MHz to 4000MHz Downconversion Mixer with LO Buffer Chip Information PROCESS: SiGe BiCMOS Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE DOCUMENT NO.