CXD1175AP 데이터 시트보기 (PDF) - Sony Semiconductor

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CXD1175AP

8-bit 20MSPS Video A/D Converter (CMOS)

Sony Semiconductor 

CXD1175AM/AP

Notes on Operation

1. Reference voltage

The self-bias function where VRT = 2.6V and VRB = 0.6V is available by shorting VRT and VRTS, VRB and

VRBS in the CXD1175A. At the PCB, either self-bias or external reference voltage can be selected

according to the way the jumper wire is connected. For shipment, the reference voltage is provided by the

self-bias. Also, when reference voltage is to be provided from the exterior, adjust the dynamic range (VRT –

VRB) to 1.8Vp-p or over.

2. Clock input

There are two modes for the PCB clock input.

1) Through an external signal generator (external clock)

2) Using a crystal oscillator (internal clock)

These two modes can be selected with a switch on the PCB.

They are given from the external clock for shipment.

3. Peripheral through hole

There is a number of through holes at the analog input, output and LOGIC areas. Those are used when

additional circuits are to be mounted on the PCB circuit.

4 The two latch ICs (74S174) on the circuit diagram are not absolutely necessary for the A/D and D/A

converter evaluation. That is, when the A/D converter output data is directly input to D/A converter input,

normal operation is maintained. However, as A/D converter output data is hardly ever subject to D/A

conversion without the digital signal processing, the PCB has been fitted with the 74S174 to show a layout

example for digital signal processing IC.

5. Analog input buffer & driver block is designed to handle conventional video band signals. Accordingly, for

tests involving frequencies higher than that, methods shown in the figure below are recommended.

S.G.

R7 75Ω

50Ω

19 V IN

D1175A

High frequency input measurement circuit

– 16 –

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