UPC2798GR データシートの表示（PDF） - NEC => Renesas Technology

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UPC2798GR

IF DOWN CONVERTOR IC FOR DIGITAL CATV

NEC => Renesas Technology 

µPC2798GR

PIN EXPLANATIONS

Pin No. Symbol

1

AGC IN1

2

AGC IN2

Pin Voltage

(V, TYP.)

Explanation

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.

1.5

Equivalent Circuit

4

AGC

control

Reg

3

VAGC

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 kΩ).

1

2

4

3

AGC

control

4

Vcc1

5

OSC

OUT

5.0

Power supply pin of IF down convertor block.

Must be connected bypass capacitor to

minimize ground impedance.

4.0

Output pin of Oscillator frequency.

Connected to PLL symthesizer IC’s input pin.

6

GND

7

OSC B2

8

OSC C1

9

OSC C2

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.

2.4

Internal oscillator consist in balance amplifier.

7 and 8pins, 9 and 10 pins should be

externally connected to oscillate with active

4.6

feedback loop.

Connected LC resonator between 7pin and

10pin.

4.6

10 OSC B1

2.4

Data Sheet P11998EJ3V0DS00

4

5

Reg

7 8 4 9 10

Reg

Reg

3

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