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MAX2690

Low-Noise, 2.5GHz

Downconverter Mixer

________________________________________________________________

Maxim Integrated Products

19-1282; Rev 0; 10/97

EVALUATION KIT

AVAILABLE

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.

_______________General Description

The MAX2690 is a miniature, low-noise, low-power

downconverter mixer designed for use in portable con-

sumer equipment. Signals at the RF input port are

mixed with signals at the local-oscillator (LO) port using

a double-balanced mixer. The RF port frequency range

is 400MHz to 2500MHz. The LO port frequency range is

700MHz to 2500MHz. The IF frequency range is 10MHz

to 500MHz, provided the LO and RF frequencies are

chosen appropriately.

The IF port is differential, which provides good linearity

and low LO emissions, as well as providing compatibili-

ty with applications using differential IF filters, such as

CDMA cellular phones. The mixer noise figure is 10dB

at 900MHz.

The MAX2690 draws 16mA at V

= 3V and operates

from a +2.7V to +5.5V supply. A logic-controlled shut-

down mode reduces the supply current to less than 1µA,

making it ideal for battery-operated equipment. This

device is offered in a miniature 10-pin µMAX package.

________________________Applications

2.45GHz Industrial-Scientific-Medical (ISM)

Band Radios

Wireless Local Area Networks (WLANs)

Personal Communications Systems (PCS)

Code-Division Multiple Access (CDMA)

Communications Systems

Cellular and Cordless Phones

Hand-Held Radios

____________________________Features

♦ 7.6dBm Input Third-Order Intercept Point

♦ 10dB Downconverter Mixer Noise Figure

♦ 7.9dB Gain

♦ 400MHz to 2500MHz Wideband Operation

♦ Low Cost

♦ +2.7V to +5.5V Single-Supply Operation

♦ <1µA Shutdown Mode

♦ Ultra-Small 10-Pin µMAX Package

PART

MAX2690EUB -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

10 µMAX

______________Ordering Information

__________________Pin Configuration

SHDN

IFOUT+

IFOUT-

GNDLORFBYP

RFIN

GND

LGND

MAX2690

µMAX

TOP VIEW

LOV

________________Functional Diagram

SHDN

IFOUT+

IFOUT-

GNDLORFBYP

RFIN

GND

LGND

MAX2690

µMAX

TOP VIEW

LOV

BIAS

Typical Operating Circuit appears at end of data sheet.

Summary of content (10 pages)

PAGE 1
9-1282; Rev 0; 10/97 KIT ATION EVALU E L B AVAILA Low-Noise, 2.5GHz Downconverter Mixer ____________________________Features ♦ 7.6dBm Input Third-Order Intercept Point The IF port is differential, which provides good linearity and low LO emissions, as well as providing compatibility with applications using differential IF filters, such as CDMA cellular phones. The mixer noise figure is 10dB at 900MHz. The MAX2690 draws 16mA at VCC = 3V and operates from a +2.7V to +5.5V supply.
PAGE 2
MAX2690 Low-Noise, 2.5GHz Downconverter Mixer ABSOLUTE MAXIMUM RATINGS VCC to GND ...........................................................-0.3V to +6.0V RFIN Input Power..............................................................10dBm LO Input Power .................................................................10dBm SHDN Input Voltage ...................................-0.3V to (VCC + 0.3V) Continuous Power Dissipation 10-Pin µMAX (derate 4.1mW/°C above +70°C) ............
PAGE 3
Low-Noise, 2.5GHz Downconverter Mixer (MAX2690 EV kit; VCC = +3.0V; PLO = -3dBm; PRF = -25dBm; SHDN = high; RFIN matched for 900MHz, 1.95GHz, and 2.45GHz as noted below. Inductor connected from LGND to GND = 39nH for 900MHz operation, 27nH for 1.95GHz operation, and 6.8nH for 2.45GHz operation. TA = +25°C, unless otherwise noted.) PARAMETER LO Emission at IF Port LO Emission at RF Port IF/2 Spurious Response (Note 3) CONDITIONS MIN TYP fRF = 900MHz, fLO = 1.1GHz -32 fRF = 1.95GHz, fLO = 1.
PAGE 4
__________________________________________Typical Operating Characteristics (MAX2690 EV kit, VCC = +3.0V, PLO = -3dBm, PRF = -25dBm, fRF = 1.95GHz, fIF = 200MHz, SHDN = high, TA = +25°C, unless otherwise noted.) 15 TA = +85°C 13 11 9 TA = -40°C 0.6 0.4 5.4 5.2 5.0 4.8 4.6 4.4 4.2 4.0 2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) IF FREQUENCY (MHz) CONVERSION GAIN vs. RF FREQUENCY NOISE FIGURE vs. RF FREQUENCY AND TEMPERATURE RF PORT IMPEDANCE vs.
PAGE 5
Low-Noise, 2.5GHz Downconverter Mixer CAPACITANCE 14 TA = +85°C 6.5 TA = +25°C 6.0 5.5 5.0 TA = -40°C 4.5 4.0 1300 1700 2100 3.5 -40 12 3.0 10 2.5 8 2.0 RESISTANCE 6 1.5 4 1.0 2 0.5 0 0 2500 1 125 RF FREQUENCY (MHz) 250 375 fRF = 900MHz IF = 200MHz -4 -5 fIF (MHz) 900 1950 2450 200 200 350 0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 9 8 fRF = 900MHz, fIF = 200MHz 7 fRF = 1.95GHz, fIF = 200MHz 6 5 fRF = 2.95GHz, fIF = 350MHz 4 3 1 1500 2000 2500 0 3000 2.0 2.
PAGE 6
________________________________________________Key Specification Statistics (MAX2690 EV kit, VCC = +3.0V, PLO = -3dBm, PRF = -25dBm, fRF = 1.95GHz, fIF = 200MHz, SHDN = high, TA = +25°C, unless otherwise noted.) Histograms represent measured data from a 30-unit sample taken from one wafer lot.
PAGE 7
Low-Noise, 2.5GHz Downconverter Mixer PIN NAME FUNCTION 1 LGND Inductive Degeneration Pin. For maximum linearity, connect LGND directly to ground with no series inductance. Trade off linearity for gain by increasing the series inductance from LGND to ground. See the Applications Information section for more information. 2 GND RF Ground. This pin must have a separate via to the ground plane, as close to the pin as possible to minimize inductance. 3 RFIN RF Input Port.
PAGE 8
MAX2690 Low-Noise, 2.5GHz Downconverter Mixer __________Applications Information plane. Low-inductance ground connections and controlled-impedance lines should be used in the layout. Local-Oscillator (LO) Input To minimize noise on the internal bias cell, SHDN should be decoupled with a 1000pF capacitor to ground. A series resistor (typically 100Ω) can also be used to reduce high-frequency signals coupling into the SHDN pin.
PAGE 9
Low-Noise, 2.5GHz Downconverter Mixer 27nH 1 LGND SHDN 100Ω 10 1000pF 1pF RF INPUT 3.3nH 3 1pF MAX2690 220nH 500Ω IFOUT+ RFBYP 1000pF VCC IFOUT5 0.1pF VCC RFIN 0.5pF 4 RF = 1.
PAGE 10
________________________________________________________Package Information 10LUMAXB.EPS MAX2690 Low-Noise, 2.