MAXIM MAX2027 User Manual

General Description

The MAX2027 high-performance, digitally controlled
variable-gain amplifier is designed for use from 50MHz
to 400MHz.

The device integrates a digitally controlled attenuator
and a high-linearity IF amplifier in one package.
Targeted for IF signal chains to adjust gain either
dynamically or as a one-time channel gain setting, the
MAX2027 is ideal for applications requiring high perfor­mance. The attenuator provides 23dB of attenuation
range with ±0.05dB state-to-state accuracy.

The MAX2027 is available in a thermally enhanced 20­pin TSSOP-EP package and operates over the -40°C to
+85°C temperature range.

Applications

Cellular Base Stations
Receiver Gain Control
Transmitter Gain Control
Broadband Systems
Automatic Test Equipment
Terrestrial Links

Features

♦ 50MHz to 400MHz Frequency Range

♦ Variable Gain: -8dB to +15dB

♦ Output IP3: 35dBm (at All Gain Settings)

♦ Noise Figure: 4.7dB at Maximum Gain

♦ Digitally Controlled Gain with 1dB Resolution and

±0.05dB State-to-State Accuracy

MAX2027

IF Digitally Controlled Variable-Gain Amplifier

________________________________________________________________ Maxim Integrated Products 1

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

12

11

9

10

MAX2027

ATTENUATION

LOGIC

CONTROL

AMP
BIAS

GND

GND

ATTN

OUT

GND

GND

RF_IN

V

CC

V

CC

GND

AMP

IN

I

BIAS

I

SET

B2

B3

B4

GND

RF_OUT

V

CC

B0

B1

Pin Configuration/

Functional Diagram

Ordering Information

19-2601; Rev 1; 2/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART TEMP RANGE PIN-PACKAGE

MAX2027EUP-T -40°C to +85°C 20 TSSOP-EP*

*EP = exposed pad.

MAX2027

IF Digitally Controlled Variable-Gain Amplifier

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

All Pins Input Voltage (except AMPIN, I

BIAS

, and I

SET

)

to GND................................................................-0.3V to +5.5V

Input Voltage Levels (B0–B4).....................-0.3V to (V

CC

+ 0.5V)

Input Voltage Levels (AMP

IN

and I

BIAS

)................-0.3V to +1.5V

Input Voltage Levels (I

SET

)....................................-0.3V to +1.0V

RF Input Signal .................................................................20dBm

RF Output Signal...............................................................22dBm

Continuous Power Dissipation (T

A

= +70°C)

20-Pin TSSOP-EP

(derate 21.7mW/°C above +70°C)..................................1.7W

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

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

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

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

DC ELECTRICAL CHARACTERISTICS

(Typical application circuit, VCC= +4.75V to +5.25V, GND = 0V. No RF signals applied, and RF input and output ports are terminated
with 50Ω. R

1

= 825Ω, TA= -40°C to +85°C. Typical values are at VCC= +5V and TA= +25°C, unless otherwise noted.) (Notes 1, 2)

PARAMETER

CONDITIONS

UNITS

SUPPLY

Supply Voltage V

CC

V

Supply Current I

CC

60 75 mA

I

SET

Current I

SET

0.9 mA

CONTROL INPUTS/OUTPUTS

Control Bits Parallel 5 Bits
Input Logic High (Note 3) 2 V
Input Logic Low 0.6 V
Input Leakage Current

µA

SYMBOL

MIN TYP MAX

4.75 5.00 5.25

-1.2 +1.2

MAX2027

IF Digitally Controlled Variable-Gain Amplifier

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(Typical application circuit without matching, VCC= +4.75V to +5.25V, GND = 0V, max gain (B0 = B1 = B2 = B3 = B4 = 0), R1=
825Ω, P

OUT

= 5dBm, fIN= 50MHz, 50Ω RF system impedance. Typical values are at VCC= +5V and TA= +25°C, unless otherwise

noted.) (Notes 1, 2)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Frequency Range f

R

50

MHz

Gain G No attenuation

dB
Noise Figure NF Max gain 4.7 dB
Minimum Reverse Isolation Max gain 22 dB
Output 1dB Compression Point P

1dB

Max gain

dBm

OIP2

42

dBm

OIP3 All gain conditions, 5dBm/tone

dBm

2nd Harmonic 2f

IN

-44 dBc

3rd Harmonic 3f

IN

-68 dBc
RF Gain-Control Range 23 dB
Gain-Control Resolution 1dB

Attenuation Absolute Accuracy

Compared to the ideal expected
attenuation

dB

Attenuation Relative Accuracy Between adjacent states

dB

Gain Drift Over Temperature TA = -40°C to +85°C

dB

Peak-to-peak for all settings,
F

CENTER

= 75MHz

0.1
Gain Flatness Over 50MHz BW

Peak-to-peak for all settings,
F

CENTER

= 200MHz

0.2

dB

Attenuator Switching Time 50% control to 90% RF 40 ns
Input Return Loss

15 dB

Output Return Loss

15 dB

Note 1: Guaranteed by design and characterization.
Note 2: All limits reflect losses of external components. Output measurements are taken at RF OUT using the typical application

circuit.

15.5

20.6
2nd-Order Output Intercept Point
3rd-Order Output Intercept Point

f1 + f2, f1 = 50MHz, f2 = 51MHz, 5dBm/tone

34.7

0.15/

-0.05

±0.05

±0.1

400

fR = 50MHz to 250MHz, all gain conditions
fR = 50MHz to 250MHz, all gain conditions