CXA1166K データシートの表示（PDF） - Sony Semiconductor

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CXA1166K

8-bit 250 MSPS Flash A/D Converter

Sony Semiconductor 

CXA1166K

10) The waveform monitoring pins P6 through P39 are designed to make connection to GND easily in order to

reduce distortion when monitoring the waveform with an oscilloscope. As shown in the diagram below, the

distance between the measuring point and GND is 300mil, and each is equipped with a through hole of

1.2mm. When a Tektronix ground chip (part No. 013-1185-00) is mounted on the tip of a probe, the

signal – GND positions match.

GND

φ1.2mm

Monitoring point

Fig. 3.

11) D/A converter (IC9) input data (waveform monitoring pins P28 to P35) are the negative logic signals of the

decimated A/D converter outputs. Those are inverted again in the D/A converter so that the direction

(rise/fall) of reproduced waveform can agree with the A/D input signal's.

12) In order to maintain the accuracy of the reproduced waveform (waveform from A/D to D/A), set the

decimator such that the clock frequency of the D/A converter (IC9: CX20201A-1) is less than 100MHz.

13) The input bandwidth weighs with the design of this PCB analog input circuit. Therefore, the SNR (signal-to-

noise ratio) should be less significant. The input circuit example to improve the SNR is shown in Fig.4. See

the measured data in Fig.s 6 to 8 for the SNR and the input circuit characteristics.

14) The part number of the digital output connector mounted on the PCB is KEL 8830E-020-170S. A

corresponding connector and cable assembly is JUNKOSHA KB0020MCG50B1.

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