Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX2681EUT+T

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

For small orders, phone 1-800-835-8769.

General Description

The MAX2680/MAX2681/MAX2682 miniature, low-cost,

low-noise downconverter mixers are designed for low-

voltage operation and are ideal for use in portable com-

munications equipment. Signals at the RF input port are

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

double-balanced mixer. These downconverter mixers

operate with RF input frequencies between 400MHz and

2500MHz, and downconvert to IF output frequencies

between 10MHz and 500MHz.

The MAX2680/MAX2681/MAX2682 operate from a sin-

gle +2.7V to +5.5V supply, allowing them to be pow-

ered directly from a 3-cell NiCd or a 1-cell Lithium

battery. These devices offer a wide range of supply

currents and input intercept (IIP3) levels to optimize

system performance. Additionally, each device features

a low-power shutdown mode in which it typically draws

less than 0.1µA of supply current. Consult the Selector

Guide for various combinations of IIP3 and supply cur-

rent.

The MAX2680/MAX2681/MAX2682 are manufactured

on a high-frequency, low-noise, advanced silicon-ger-

manium process and are offered in the space-saving

6-pin SOT23 package.

Applications

400MHz/900MHz/2.4GHz ISM-Band Radios

Personal Communications Systems (PCS)

Cellular and Cordless Phones

Wireless Local Loop

IEEE-802.11 and Wireless Data

Features

♦ 400MHz to 2.5GHz Operation

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

♦ Low Noise Figure: 6.3dB at 900MHz (MAX2680)

♦ High Input Third-Order Intercept Point

(IIP3 at 2450MHz)

-6.9dBm at 5.0mA (MAX2680)

+1.0dBm at 8.7mA (MAX2681)

+3.2dBm at 15.0mA (MAX2682)

♦ <0.1µA Low-Power Shutdown Mode

♦ Ultra-Small Surface-Mount Packaging

MAX2680/MAX2681/MAX2682

400MHz to 2.5GHz, Low-Noise,

SiGe Downconverter Mixers

________________________________________________________________ Maxim Integrated Products 1

GND

IFOUTRFIN

16SHDN

5 V

MAX2680

MAX2681

MAX2682

SOT23-6

TOP VIEW

19-4786; Rev 2; 8/03

PART

MAX2680EUT-T

MAX2681EUT-T

MAX2682EUT-T

-40°C to +85°C

TEMP RANGE

PIN-

PACKAGE

6 SOT23-6

EVALUATION KIT

AVAILABLE

Pin Configuration

Ordering Information

SOT

TOP MARK

AAAR

AAAS

AAAT

8.7MAX2681

5.0MAX2680

Selector Guide

PART

(mA)

-6.1

IIP3

(dBm)

-12.9

7.0

(dB)

6.3

14.2

GAIN

(dB)

11.6

900MHz

+0.5

IIP3

(dBm)

-8.2

11.1

(dB)

8.3

8.4

GAIN

(dB)

7.6

1950MHz

+1.0

IIP3

(dBm)

-6.9

12.7

(dB)

11.7

7.7

GAIN

(dB)

7.0

2450MHz

-1.815.0MAX2682 6.5 14.7 +4.4 10.2 10.4 +3.2 13.4 7.9

Typical Operating Circuit appears at end of data sheet.

FREQUENCY

Summary of content (11 pages)

PAGE 1
9-4786; Rev 2; 8/03 KIT ATION EVALU E L B A AVAIL 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers The MAX2680/MAX2681/MAX2682 operate from a single +2.7V to +5.5V supply, allowing them to be powered directly from a 3-cell NiCd or a 1-cell Lithium battery. These devices offer a wide range of supply currents and input intercept (IIP3) levels to optimize system performance. Additionally, each device features a low-power shutdown mode in which it typically draws less than 0.1µA of supply current.
PAGE 2
MAX2680/MAX2681/MAX2682 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers ABSOLUTE MAXIMUM RATINGS VCC to GND ..........................................................-0.3V to +6.0V RFIN Input Power (50Ω Source).....................................+10dBm LO Input Power (50Ω Source) ........................................+10dBm SHDN, IFOUT, RFIN to GND ......................-0.3V to (VCC + 0.3V) LO to GND..........................................(VCC - 1V) to (VCC + 0.
PAGE 3
400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers (MAX2680/1/2 EV Kit, VCC = SHDN = +3.0V, TA = +25°C, unless otherwise noted. RFIN and IFOUT matched to 50Ω. PLO = -5dBm, PRFIN = -25dBm.
PAGE 4
AC ELECTRICAL CHARACTERISTICS (continued) (MAX2680/1/2 EV Kit, VCC = SHDN = +3.0V, TA = +25°C, unless otherwise noted. RFIN and IFOUT matched to 50Ω. PLO = -5dBm, PRFIN = -25dBm.) PARAMETER CONDITIONS MIN TYP MAX UNITS LO Input VSWR 50Ω source impedance LO Leakage at IFOUT Port fLO = 1880MHz -23 dBm LO Leakage at RFIN Port fLO = 1880MHz -27 dBm IF/2 Spurious Response fRF = 1915MHz, fLO = 1880MHz, fIF = 70MHz (Note 4) -61 dBm Note 1: Note 2: Note 3: Note 4: 1.
PAGE 5
400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers 0.07 TA = +85°C TA = +25°C 0.06 0.05 0.04 TA = -40°C 0.03 0.02 0.05 0.04 3.5 4.0 4.5 5.0 TA = -40°C 0.03 0.02 0 3.0 TA = +85°C TA = +25°C 0.06 0.01 5.5 0.10 SHDN = GND 0.09 0.08 0.07 TA = +85°C TA = +25°C 0.06 0.05 0.04 0.03 TA = -40°C 0.02 0.01 0 2.5 3.0 3.5 4.0 4.5 5.0 2.5 5.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) MAX2680 CONVERSION POWER GAIN vs.
PAGE 6
400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers MAX2680/MAX2681/MAX2682 Typical Operating Characteristics (continued) (Typical Operating Circuit, VCC = SHDN = +3.0V, PRFIN = -25dBm, PLO = -5dBm, TA = +25°C, unless otherwise noted.) MAX2681 INPUT IP3 vs. LO POWER -9 0 -1 -10 1 -3 -12 -10 -8 -6 -4 -2 0 0 -14 -12 -10 -8 -6 -4 -2 0 -14 -10 -8 -6 -4 -2 LO POWER (dBm) LO POWER (dBm) MAX2680 NOISE FIGURE vs. LO POWER MAX2681 NOISE FIGURE vs. LO POWER MAX2682 NOISE FIGURE vs.
PAGE 7
400MHz to 2.
PAGE 8
Typical Operating Characteristics (continued) (Typical Operating Circuit, VCC = SHDN = +3.0V, PRFIN = -25dBm, PLO = -5dBm, TA = +25°C, unless otherwise noted.) IFOUT 50mV/ div MAX2680/1/2-32 SHDN 2V/div SHDN 2V/div Z1 = 39pF 500ns/div SHDN 2V/div IFOUT 50mV/ div IFOUT 50mV/ div Z1 = 39pF MAX2682 TURN-OFF/ON CHARACTERISTICS MAX2681 TURN-OFF/ON CHARACTERISTICS MAX2680/1/2-33 MAX2680 TURN-OFF/ON CHARACTERISTICS MAX2680/1/2-31 MAX2680/MAX2681/MAX2682 400MHz to 2.
PAGE 9
400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers The MAX2680/MAX2681/MAX2682 are 400MHz to 2.5GHz, silicon-germanium, double-balanced downconverter mixers. They are designed to provide optimum linearity performance for a specified supply current. They consist of a double-balanced Gilbert-cell mixer with single-ended RF, LO, and IF port connections. An on-chip bias cell provides a low-power shutdown feature. Consult the Selector Guide for device features and comparison.
PAGE 10
MAX2680/MAX2681/MAX2682 400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers Power-Supply Layout Table 3. IFOUT Port Impedance To minimize coupling between different sections of the IC, the ideal power-supply layout is a star configuration with a large decoupling capacitor at a central V CC node. The V CC traces branch out from this central node, each going to a separate VCC node on the PC board. At the end of each trace is a bypass capacitor that has low ESR at the RF frequency of operation.
PAGE 11
400MHz to 2.5GHz, Low-Noise, SiGe Downconverter Mixers Package Information 6LSOT.EPS (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) PACKAGE OUTLINE, SOT-23, 6L 21-0058 F 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.