MAX2027 データシートの表示（PDF） - Maxim Integrated

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MAX2027

IF Digitally Controlled Variable-Gain Amplifier

Maxim Integrated 

IF Digitally Controlled Variable-Gain Amplifier

C1

RF IN

C8*

VCC

CONTROL

INPUTS

VCC

C7

L3*

1

C2

2

3

4

R6 R5 R4 R3 R2

5

6

B4

B3 7

B2 8

9

B1

B0 10

20

MAX2027

19

L4*

C9*

EXPOSED

PADDLE

18 ATTNOUT

17

C3

ATTENUATION

LOGIC

CONTROL

16

15 AMPIN

AMP

BIAS

14 IBIAS

13

ISET R1

12

11

L1

C4

L2

C10

RF OUT

*OPTIONAL COMPONENTS: USE TO IMPROVE HIGHER FREQUENCY MATCHING

VCC

C5

C6

Figure 1. Typical Application Circuit

Fixed-Gain Amplifier

The MAX2027 integrates a fixed-gain amplifier in a neg-

ative feedback topology. This fixed-gain amplifier is

optimized for a frequency range of operation from

50MHz to 400MHz with a high-output third-order inter-

cept point (OIP3). The bias current is chosen to opti-

mize the IP3 of the amplifier. When R1 is 825Ω, the

current consumption is 60mA while exhibiting a typical

35dBm output IP3.

Choke Inductor

The fixed-gain amplifier output port requires an external

pullup choke inductor to VCC. At the input, connect a

bias inductor of 330nH from AMPIN (pin 15) to IBIAS

(pin 14). At the output, connect a 680nH choke inductor

from RF_OUT (pin 12) to VCC (pin 11) to provide bias

current to the amplifier.

Layout Considerations

A properly designed PC board is an essential part of

any RF/microwave circuit. Keep RF signal lines as short

as possible to reduce losses, radiation, and induc-

tance. For the best performance, route the ground pin

traces directly to the exposed pad under the package.

The PC board exposed pad must be connected to the

ground plane of the PC board. It is suggested that multi-

ple vias be used to connect this pad to the lower level

ground planes. This method provides a good RF/thermal

conduction path for the device. Solder the exposed pad

on the bottom of the device package to the PC board.

The MAX2027 Evaluation Kit can be used as a refer-

ence for board layout. Gerber files are available upon

request at www.maxim-ic.com.

Power-Supply Bypassing

Proper voltage-supply bypassing is essential for high-

frequency circuit stability. Bypass each VCC pin with a

0.1µF and 100pF capacitor. Connect the 100pF capacitor

as close to VCC pins as possible.

Exposed Pad RF/Thermal Considerations

The exposed paddle (EP) of the MAX2027’s 20-pin

TSSOP-EP package provides a low thermal-resistance

path to the die. It is important that the PC board on

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