MAX2685EEE datasheet(3/10 Pages) MAXIM

3 / 10 page

Low-Cost, 900MHz, Low-Noise Amplifier

and Downconverter Mixer

_______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2685 EV kit, VCC = V SHDN = +3V, fLNAIN = fMIXIN = 880MHz, fLO = 960MHz, PLNAIN = -30dBm, PLO = -8dBm, PMIXIN = -25dBm,

differential IFOUT operation, Zo = 50Ω, TA = +25°C, unless otherwise noted.)

Note 1: This is the recommended operating frequency range.

Note 2: Maximum and minimum limits are guaranteed by design and device characterization and are not production tested.

Note 3: Two tones at 880MHz and 880.1MHz, -30dBm per tone.

Note 4: Two tones at 880MHz and 880.1MHz, -10dBm per tone.

Note 5: Two tones at 880MHz and 880.1MHz, -25dBm per tone.

Note 6: Time from SHDN = high, until the cascaded receive gain is within 1dB of its final value. Measured with 47pF blocking

capacitors on LNAIN and LNAOUT. Matching network removed from IFOUT output.

Typical Operating Characteristics

(MAX2685 EV kit, VCC = V SHDN = +3V, fLNAIN = fMIXIN = 880MHz, fLO = 960MHz, PLNAIN = -30dBm, PLO = -8dBm, PMIXIN = -25dBm,

differential IFOUT operation, Zo = 50Ω, TA = +25°C, unless otherwise noted.)

2.5

3.5

3.0

4.0

4.5

5.0

5.5

SUPPLY CURRENT vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

GAIN = HIGH

GAIN = LOW

TA = +85°C

TA = +25°C

TA = -40°C

TA = +85°C

TA = +25°C

TA = -40°C

2.5

3.5

3.0

4.0

4.5

5.0

5.5

SHUTDOWN SUPPLY CURRENT

vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

SHDN = GND

TA = -40°C

TA = +25°C

TA = +85°C

-15

-5

-10

2.5

3.5

4.0

3.0

4.5

5.0

5.5

LNA GAIN vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

GAIN = HIGH

GAIN = LOW TA = +85°C

TA = +25°C T

A = -40°C

TA = +85°C

TA = +25°C

TA = -40°C

GAIN = GND

12.1

Mixer Noise Figure (SSB)

GAIN = VCC, TA = TMIN to TMAX (Note 2)

GAIN = VCC

Mixer Conversion Gain Variation over

Temperature

(Note 6)

GAIN = VCC

GAIN = GND

CONDITIONS

µs

0.8

Receiver Enable Time

dBm

-1.5

Mixer Input IP3 (Note 5)

LO Port Return Loss

UNITS

MIN

TYP

MAX

PARAMETER

SHDN = VCC or GND

LO-to-LNAIN Isolation

LNAOUT-to-MIXIN Isolation

LO-to-MIXIN Isolation

OVERALL SYSTEM

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