Rainbow Electronics MAX2406 User Manual

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________________General Description

The MAX2406 low-noise amplifier (LNA)/downconverter
mixer is designed for use over a wide range of frequen­cies and is optimized for communications systems
operating at a frequency of 1.9GHz. Applications
include PWT1900/DCT1900, DCS1800/PCS1900, PHS,
and DECT. This device includes an LNA, a downcon­verter mixer, and a local-oscillator (LO) buffer in a low­cost, plastic surface-mount package. At 1.9GHz, the
LNA has 2.5dB typical noise figure and a -9.5dBm input
third-order intercept point (IP3). The downconverter
mixer has a low 9.1dB noise figure and a 4.5dBm input
IP3. Image and LO filtering are implemented off-chip for
maximum flexibility.

The MAX2406 has a differential IF port that can be used
in a single-ended configuration by tying the unused
side to VCC. The LO buffer can be driven differentially
or in a single-ended configuration with only -10dBm of
LO power. Power consumption is 60mW in receive
mode, and typically drops to less than 1µW in shut­down mode.

For transceiver applications, the MAX2410 or
MAX2411A both offer a transmitter along with a similar
receiver.

________________________Applications

PWT1900/DCT1900
DCS1800/PCS1900
PHS/PACS
DECT

____________________________Features

♦ Integrated LNA/Downconverter
♦ 3.2dB Combined Receiver Noise Figure:

2.5dB (LNA)

9.1dB (mixer)

♦ -12.5dBm Combined Receiver Input IP3:

-9.5dBm (LNA)

4.5dBm (mixer)

♦ LO Buffer
♦ +2.7V to +5.5V Single-Supply Operation
♦ 60mW Power Consumption
♦ Low-Power Shutdown Mode

MAX2406

Low-Cost Downconverter

with Low-Noise Amplifier

________________________________________________________________

Maxim Integrated Products

1

20
19
18
17
16
15
14
13

1
2
3
4
5
6
7
8

GND
LNAOUT
GND
GNDGND

GND

LNAIN

GND

TOP VIEW

RXMXIN
GND
IF
IFLO

LO

RXEN

V

CC

12
11

9

10

GND
GNDGND

V

CC

MAX2406

QSOP

__________________Pin Configuration

POWER

MANAGEMENT

RXMXIN

IF
IF

LO

LNAIN

LNAOUT

RXEN

MAX2406

LO

________________Functional Diagram

19-1303; Rev 0; 10/97

PART

MAX2406EEP -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

20 QSOP

EVALUATION KIT

AVAILABLE

______________Ordering Information

Typical Application Functional Diagram appears at end of
data sheet.

MAX2406

Low-Cost Downconverter
with Low-Noise Amplifier

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= 2.7V to 5.5V, RXEN = 2V, LNAIN = RXMXIN = open, LNAOUT pulled up with 100Ω to VCC, IF and IF pulled up with 50Ω to

V

CC

, TA= -40°C to +85°C. Typical values are at TA= +25°C and VCC= 3.0V, unless otherwise noted.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: Guaranteed by design and characterization.
Note 2: 1.9GHz and 1.901GHz tones at -30dBm per tone.
Note 3: 1.9GHz and 1.901GHz tones at -21.5dBm per tone.
Note 4: Mixer operation is guaranteed to this frequency. For optimum gain, adjust IF output match. See the IF Output Impedance

(single ended) vs. Frequency graph in the

Typical Operating Characteristics.

Note 5: Time from RXEN = low to RXEN = high, until the combined receive gain is within 1dB of its final value. Measured with 47pF

blocking capacitors on LNAIN and LNAOUT.

Note 6: At this LO drive level, the mixer conversion gain is typically 1dB lower than with -10dBm LO drive.

V

CC

to GND ................................................................-0.3V to 6V

LNAIN Input Power...........................................................15dBm

LO, LO Input Power..........................................................10dBm

RXMXIN Input Power ........................................................10dBm

RXEN Voltage to GND................................-0.3V to (V

CC

+ 0.3V)

RXEN Current........................................................................5mA

Continuous Power Dissipation (T

A

= +70°C)

QSOP (derate 9.1mW/°C above +70°C) ......................727mW

Junction Temperature......................................................+150°C

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature.........................................-65°C to +165°C

Lead Temperature (soldering, 10sec).............................+300°C

RXEN = 2.0V

RXEN = GND, VCC= 3.0V

CONDITIONS

V0.6RXEN Input Voltage Low

V2.0

V2.7 5.5Supply-Voltage Range

RXEN Input Voltage High

µA0.1 1.0RXEN Input Bias Current

mA20 30Supply Current, Receive Mode

µA0.1 10Supply Current, Shutdown Mode

UNITSMIN TYP MAXPARAMETER

TA= T

MIN

to T

MAX

TA= +25°C

(Notes 1 and 4)

RXEN = high or low

(Note 3)

Single sideband

(Note 2)

TA= +25°C

(Note 6)

TA= T

MIN

to T

MAX

(Notes 1 and 5)

CONDITIONS

dBm-49LO to LNAIN Leakage

dBm-17Minimum LO Drive Level

µs0.5 2.5Receiver Turn-On Time

dB2.5LNA Noise Figure

12.2 18.8

dB

13.6 16 17.6

LNA Gain (Note 1)

MHz450Mixer Output Frequency

dBm-7Mixer Input 1dB Compression

dBm4.5Mixer Input IP3

dB9.1Mixer Noise Figure

dBm-9.5LNA Input IP3
dBm-5.6LNA Output 1dB Compression

dB

7.4 8.4 9.0

Mixer Conversion Gain (Note 1)

6.2 10.2

UNITSMIN TYP MAXPARAMETER

AC ELECTRICAL CHARACTERISTICS

(MAX2406EVKIT, Rev. B, VCC= 3.0V, RXEN = VCC, ƒLO= 1.5GHz, ƒ

LNAIN

= ƒ

RXMXIN

= 1.9GHz, P

LNAIN

= -30dBm,

P

RXMXIN

= -21.5dBm, PLO= -10dBm, differential IF operation, 50Ω system, TA= +25°C, unless otherwise noted.)

MAX2406

Low-Cost Downconverter

with Low-Noise Amplifier

_______________________________________________________________________________________

3

5

15

10

20

25

-40 10-15 35 60 85

SUPPLY CURRENT vs. TEMPERATURE

MAX2406-01

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

VCC = 5.5V

VCC = 3.0V

VCC = 2.7V

0

0.5

1.0

1.5

2.0

-40 -15 10 35 60 85

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

MAX2406-02

TEMPERATURE (°C)

SHUTDOWN SUPPLY CURRENT ( µA)

VCC = 5.5V

VCC = 4V

VCC = 3V

VCC = 2.7V

0

40

20

80

60

100

120

-200

-120

-160

-40

-80

0

40

0 1000 1500500 2000 2500 3000

LNA INPUT IMPEDANCE vs. FREQUENCY

MAX2406-03A

FREQUENCY (MHz)

REAL IMPEDANCE (Ω)

IMAGINARY IMPEDANCE (Ω)

IMAGINARY

MEASURED AT
DEVICE PIN

REAL

REAL

0

100

50

200

150

250

300

-120

-80

-100

-40

-60

-20

0

0 1000 1500500 2000 2500 3000

LNA OUTPUT IMPEDANCE

vs. FREQUENCY

MAX2406-03B

FREQUENCY (MHz)

REAL IMPEDANCE (Ω)

IMAGINARY IMPEDANCE (Ω)

MEASURED AT
DEVICE PIN

IMAGINARY

-12

-11

-9

-10

-8

-7

-40 10-15 35 60 85

LNA INPUT IP3 vs. TEMPERATURE

MAX2406-06

TEMPERATURE (°C)

INPUT IP3 (dBm)

VCC = 5.5V

VCC = 3.0V

VCC = 2.7V

0

5

10

15

20

25

800 16801240 2120 2560 3000

LNA GAIN vs. FREQUENCY

MAX2406-04

FREQUENCY (MHz)

GAIN (dB)

WITH 1pF SHUNT
CAPACITOR AT INPUT

WITHOUT 1pF SHUNT
CAPACITOR AT INPUT

12

14

18

16

20

22

-40 10-15 35 60 85

LNA GAIN vs. TEMPERATURE

MAX2406-05

TEMPERATURE (°C)

GAIN (dB)

VCC = 5.5V

VCC = 4V

VCC = 3V

VCC = 2.7V

-10

-8

-4

-6

-2

0

-40 10-15 35 60 85

LNA OUTPUT 1dB COMPRESSION POINT

vs. TEMPERATURE

MAX2406-07

TEMPERATURE (°C)

OUTPUT 1dB COMPRESSION POINT (dBm)

VCC = 5.5V

VCC = 3.0V

VCC = 2.7V

0.0

1.0

0.5

2.0

1.5

3.0

2.5

3.5

4.5

4.0

5.0

100 480 860 1240 1620 2000

LNA NOISE FIGURE vs. FREQUENCY

MAX2406-09

FREQUENCY (MHz)

NOISE FIGURE (dB)

__________________________________________Typical Operating Characteristics

(MAX2406EVKIT, Rev. B, VCC= 3.3V, RXEN = VCC, ƒLO= 1.5GHz, ƒ

LNAIN

= ƒ

RXMXIN

= 1.9GHz, P

LNAIN

= -30dBm,

P

RXMXIN

= -21.5dBm, PLO= -10dBm, differential IF operation, 50Ω system, TA= +25°C, unless otherwise noted.)