NJM2278 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJM2278

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NJM2278

! TERMINAL FUNCTION

Pin No. SYMBOL

EQUIVARENT CIRCUIT

1

RF IN

2

GND

3

EMI

5

6

4

4

RF OUT

2

13

VOLTAGE

FUNCTION

RF Input

The typical input impedance is

0.8V 70Ω@400MHz.

Ground

For best performance, keep traces

--

physically short and connect

immediately to ground plane.

Emitter

In most applications, keep traces

0V

physically short and connect

immediately to ground plane.

RF Output

This is an unmatched collector

output of the final amplifier. The

typical output impedance is 110Ω

@400MHz.

The external matching circuit is

connected to present the optimum

load impedance for maximum

2.7V

power and efficiency. An additional

circuit of a bias inductor and series

resistor provides DC bias. This

resistor also serves to control the

power gain by adjusting collector

current.

5

V+

6

IREF

Supply Voltage

An external bypassing capacitance

2.7V of 0.1uF is recommended.

Reference of Current Source

An external decoupling capacitor

0.8V

is placed between this pin and

ground, and placed as close as

possible to this pin.

Note:

1. DC voltage of each pin is measured under the following condition

Ta=25°C, V+=2.7V, no RF signal input, test circuit1

2. ESD protection diode exist between each of the following pins and V+

pin 1, 3, 6

3. ESD protection diode exist between each of the following pins and ground

pin 1, 3, 4, 5, 6

Ver.2008-08-22

-6-

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