UPC2798 datasheet(3/24 Pages) NEC

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Data Sheet P11998EJ3V0DS00

µµµµPC2798GR

PIN EXPLANATIONS

Pin No.

Symbol

Pin Voltage

(V, TYP.)

Explanation

Equivalent Circuit

AGC IN1

1.5

Input pin of IF signal.

1pin is same phase and 2pin is opposite

phase at balance input.

In case of single input, 1pin or 2pin should

be grounded through capacitor.

AGC IN2

1.5

3VAGC

0 to 5

Automatic gain control pin.

This pin’s bias govern the AGC output level.

Minimum gain at VAGC = 0 V

Maximum gain at VAGC = 5 V

Recommend to use by deviding AGC voltage

with externally resistor (ex. 100 k

Ω).

Vcc1

5.0

Power supply pin of IF down convertor block.

Must be connected bypass capacitor to

minimize ground impedance.

5OSC

OUT

4.0

Output pin of Oscillator frequency.

Connected to PLL symthesizer IC’s input pin.

GND

0.0

Ground pin.

Must be connected to the system ground

with minimum inductance.

Ground pattern on the board should be

formed as wide as possible.

OSC B2

2.4

8OSC C1

4.6

9OSC C2

4.6

OSC B1

2.4

Internal oscillator consist in balance amplifier.

7 and 8pins, 9 and 10 pins should be

externally connected to oscillate with active

feedback loop.

Connected LC resonator between 7pin and

10pin.

AGC

control

Reg

AGC

control

Reg

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