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CXD2302Q

List of Parts

resistance

R1

100K

R2

75

Ω

R3

75

Ω

R4

510

Ω

R5

510

Ω

R6

510

Ω

R7

R = 200

R8

18R

≈ 3.3K

R9

75

Ω

R10

75

Ω

VR1

2K

VR2

2K

VR3

20K

VR4

20K

VR5

20K

capacitance

C1

470µF/6.3V (chemical)

C2

10µF/16V (chemical)

C3

0.01µF

C4

0.01µF

C5

0.1µF

C6

0.1µF

C7

0.1µF

C8

0.1µF

C9

0.1µF

C10

0.1µF

C11

47µF/10V (chemical)

C12

47µF/10V (chemical)

C13

47µF/10V (chemical)

C14

0.1µF

transistor

Q1

2SC2785

Q2

2SC2785

Q3

2SC2785

IC

IC1

74S174

IC2

74S174

IC3

74S04

oscillator

OSC

others

connector

BNC071

SW

AT1D2M3

Adjustment

1. Vref adjustment (VR1, VR2)

Adjustment of A/D converter reference voltage. VRB is adjusted through VR1 and VRT through VR2.

When self bias is used, there is no need for adjustment. Reference voltage is set through self bias delivery.

2. Setting of clamp reference voltage (VR3)

Clamp reference voltage is set.

3. DAC output full scale adjustment (VR4)

Full scale voltage of D/A converter output is adjusted at the PCB shipment, the full scale voltage is

adjusted to approx. 2V.

4. Sync (clamp) pulse interface (VR5)

This adjustment enables interface with the signal generator and others at the PCB shipment, adjustment is

performed to obtain a threshold of approx. 2.5V to an H sync of 0 to 5V.