CXD1170 데이터 시트보기 (PDF) - Sony Semiconductor

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CXD1170

6-bit 40MSPS High Speed D/A Converter

Sony Semiconductor 

CXD1170M

Notes on Operation

• How to select the output resistance

The CXD1170M is a D/A converter of the current output type. To obtain the output voltage connect the

resistance to IO pin. For specifications we have:

Output full scale voltage VFS = less than 2.0 [V]

Output full scale current IFS = less than 15 [mA]

Calculate the output resistance value from the relation of VFS = IFS × R. Also, 16 times resistance of the

output resistance is connected to reference current pin IREF. In some cases, however, this turns out to be a

value that does not actually exist. In such a case a value close to it can be used as a substitute. Here please

note that VFS becomes VFS = VREF × 16R/R'. R is the resistance connected to IO while R' is connected to

IREF. Increasing the resistance value can curb power consumption. On the other hand glitch energy and data

settling time will inversely increase. Set the most suitable value according to the desired application.

• Phase relation between data and clock

To obtain the expected performance as a D/A converter, it is necessary to set properly the phase relation

between data and clock applied from the exterior. Be sure to satisfy the provisions of the setup time (tS) and

hold time (tH) as stipulated in the Electrical Characteristics.

• VDD, VSS

To reduce noise effects separate analog and digital systems in the device periphery. For VDD pins, both

digital and analog, bypass respective GNDs by using a ceramic capacitor of about 0.1µF, as close as

possible to the pin.

• Latch up

AVDD and DVDD have to be common at the PCB power supply source. This is to prevent latch up due to

voltage difference between AVDD and DVDD pins when power supply is turned ON.

–6–

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