Rainbow Electronics MAX2374 User Manual

General Description

The MAX2374 silicon-germanium (SiGe), switchable­gain, variable-linearity, low-noise amplifier (LNA) is
designed for cellular-band, code-division multiple­access (CDMA). It can be used for applications such
as TDMA and PDC or wherever high dynamic range
and low noise are required. This LNA provides a high
intermodulation intercept point (IIP3), which is
adjustable to meet specific system requirements by
selecting an appropriate external resistor. To achieve
high gain and low noise, the LNA is packaged in a tiny
ultra-chip-scale package (UCSP) with six solder
bumps. The LNA operates from a +2.7V to +5.5V single
supply and consumes just 8.5mA while achieving a
+6.2dBm input IIP3. Supply current reduces to less
than 1µA in shutdown mode.

The MAX2374 provides two gain modes. High-gain
mode optimizes system sensitivity, while low-gain mode
optimizes system linearity.

Applications

CDMA Phones

TDMA Phones

Wireless Local Loop (WLL)

GSM Handsets

Land Mobile Radio

Wireless Data

Features

♦ +2.7V to +5.5V Single Supply

♦ Low Operating Current

8.5mA for High Linearity

4.5mA for Paging

4.1mA in Low-Gain, High-Linearity Mode

♦ Low Noise Figure: 1.5dB Cellular

♦ Adjustable IIP3

♦ Two Gain Settings

♦ < 1µA Shutdown Mode

♦ Ultra-Small 6-Bump UCSP (1mm x 1.5mm)

MAX2374

SiGe, Variable IIP3, Low-Noise Amplifier

in UCSP Package

________________________________________________________________ Maxim Integrated Products 1

19-1614; Rev 0; 6/00

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Ordering Information

*UCSP reliability is integrally linked to the user’s assembly
methods, circuit board material, and environment. Refer to the
UCSP Reliability Notice in the UCSP Reliability section of this
data sheet for more information.

For free samples and the latest literature, visit www.maxim-ic.com or phone [phone].
For small orders, phone [phone].

Pin Configuration appears at end of data sheet.

Typical Application Circuit

PART

MAX2374EBT

TEMP. RANGE

-40°C to +85°C

PIN­PACKAGE

6 UCSP*

TOP

MARK

AAB

+ 2.75V

V

CC =

100pF

A3

GND

5pF

LNA INPUT LNA OUTPUT

6.8nH

0.01µF

GAIN-CONTROL
LOGIC OUTPUT

MAX2374

A2

LNAIN

A1

GAIN

LNAOUT

V

BIAS

B3

CC

8.2nH

B2

B1

R

BIAS

2pF

V

CC

MAX2374

SiGe, Variable IIP3, Low-Noise Amplifier
in UCSP Package

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.5V, R

BIAS

= 20kΩ, V

GAIN

= high, LNAOUT = VCC, no input signals at LNAIN, TA= -40°C to +85°C. Typical values

are at V

CC

= +2.75V, TA= +25°C, unless otherwise noted.) (Note 1)

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.

VCCto GND...........................................................-0.3V to +6.0V

GAIN, BIAS Voltage to GND...................-0.3V to (V

CC

+ 0.3V)

GAIN, BIAS Current ......................................................±10mA

RF Input Power

LNAIN .........................................................................+10dBm

LNAOUT to GND ....................................-0.3V to (V

CC

+ 0.6V)

Continuous Power Dissipation (T

A

= +85°C) ...................540mW

Operating Temperature Range

MAX2374 .........................................................-40°C to +85°C

Storage Temperature.........................................-65°C to +150°C

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

VCC= 2.75V

GAIN = 0.6V, VCC= 2.75V

BIAS = open circuit

VCC= 5.5V

R

BIAS

= 10kΩ

R

BIAS

= 43kΩ

CONDITIONS

V

VCC-

1.16

BIAS Pin Voltage (Note 2)

µA-5 5Input Current

V0.6Input Logic Voltage Low

V1.5Input Logic Voltage High

µA0.1 1Shutdown Supply Current

8.5 10.5

V2.7 5.5Supply Voltage

mA

4.5 5.5

Supply Current

10.5

15

4.5

UNITSMIN TYP MAXPARAMETER

AC ELECTRICAL CHARACTERISTICS

(Typical Application Circuit, VCC= +2.7V to +5.5V, P

LNAIN

= -30dBm, V

GAIN

= high, f

LNAIN

= 881MHz, R

BIAS

= 20kΩ, TA= +25°C.

Typical values are at V

CC

= +2.75V, unless otherwise noted.) (Note 2)

VCC= 2.75V

All modes, f ≤ 6.5GHz

Input and output ports externally matched to 50Ω

V

GAIN

= high

CONDITIONS

10:1Maximum Stable Load VSWR

MHz750 1000

Recommended Operating Frequency
Range (Note 3)

dBm

-3.5

Output 1dB Compression

dB14Input and Output Return Loss

-20

6

UNITSMIN TYP MAXPARAMETER

V

GAIN

= high

V

GAIN

= low

V

GAIN

= low

dB

-9

Reverse Isolation

SUPPLY

GAIN CONTROL INPUT

TA= -40°C to +85°C

MAX2374

SiGe, Variable IIP3, Low-Noise Amplifier

in UCSP Package

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS (continued)

(Typical Application Circuit, VCC= +2.7V to +5.5V, P

LNAIN

= -30dBm, V

GAIN

= high, f

LNAIN

= 881MHz, R

BIAS

= 18kΩ, TA= +25°C.

Typical values are at V

CC

= +2.75V, unless otherwise noted.) (Note 2)

VCC= 2.75V

CONDITIONS

dB1.5 1.7Noise Figure

dB

12.5 17

Gain

13.8 15 15.6

UNITSMIN TYP MAXPARAMETER

Note 1: Production tested at TA= +25°C. Maximum and minimum limits are guaranteed by design and characterization.
Note 2: Guaranteed by design and characterization.
Note 3: Operation over this frequency range is possible with a matching network tuned to the desired operating frequency.
Note 4: Measured with two-tone test with P

LNAIN

= -25dBm per tone, f1 = 881MHz, f2 = 881.9MHz.

0.4 1.2 2

Gain TA= -40°C to +85°C

-1 3.5

dB

Noise Figure 3 3.5 dB

TA= +25°C

TA= +25°C

TA= -40°C to +85°C

7.2

4.5 6.2

MAX2374 dBm

4.2

Input Third-Order Intercept Point (Note 4)

R

BIAS

= 10kΩ

R

BIAS

= 20kΩ

R

BIAS

= 43kΩ

10.5

5.8 7.2

Input Third-Order Intercept Point (Note 4) MAX2374

1

dBm

HIGH-GAIN MODE (GAIN = VCC)

LOW-GAIN MODE (GAIN = GND)

R

BIAS

= 10kΩ

R

BIAS

= 20kΩ

R

BIAS

= 43kΩ

12

10

8

6

4

2.5 4.03.0 3.5 4.5 5.0 5.5

ICC vs. V

CC

AND TEMPERATURE

MAX2374-01

VCC (V)

I

CC

(mA)

TA = -40°C

TA = +25°C

TA = +85°C

TA = +85°C

TA = +25°C

TA = -40°C

GAIN = V

CC

GAIN = GND

R

BIAS

= 20kΩ

-30

-20

0

-10

10

20

750 850800 900 950 1000

MAX2374-03

FREQUENCY (MHz)

MAGNITUDE (dB)

S21, S11, S22, S12 vs. FREQUENCY

S21

S11

S22

S12

V

CC

= GAIN = 2.75V

-20

-15

-5

-10

0

5

750 850800 900 950 1000

S21, S11, S22, S12 vs. FREQUENCY

MAX2374-04

FREQUENCY (MHz)

MAGNITUDE (dB)

S21

S12

S11

S22

V

CC

= 2.75V

GAIN = GND

TA= -40°C to +85°C

Typical Operating Characteristics

(Typical Application Circuit, VCC= +2.7V to +5.5V, P

LNAIN

= -30dBm, f

LNAIN

= 881MHz, R

BIAS

= 20kΩ, TA= +25°C, unless other-

wise noted.)