CXD2309Q 데이터 시트보기 (PDF) - Sony Semiconductor

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CXD2309Q

10-bit 85MSPS 3-Channel D/A Converter

Sony Semiconductor 

CXD2309Q

Notes on Operation

• Selecting the Output Resistance

CXD2309Q is a current output type D/A converter. The output voltage can be obtained by connecting the

resistor ROUT to the current output pins RO, GO and BO.

Specifications:

Output full-scale voltage VFS = 1.8 to 2.0 [V]

Output full-scale current IFS = 9.0 to 10.0 [mA]

Calculate the output resistance from VFS = IFS × ROUT. Connect a resistance sixteen times the output

resistance to the reference current output pin IREF. In some cases, as this value may not exist, a similar

value can be used instead.

Note that the VFS will be the following.

VFS = VREF × 16ROUT/RIR

VREF is the voltage set at the reference voltage input pin VREF, ROUT is the resistor to be connected to the

current output pins RO, GO, BO and RIR is the resistor to be connected to the IREF. Power consumption can

be reduced by increasing the resistance, but this will on the contrary increase the glitch energy and data

setting time. Set the best values according to the purpose of use.

• Correlation between Data and Clock

For CXD2309Q to display the desired performance as a D/A converter, the data transmitted from outside and

the clock must be synchronized properly. Adjust the setup time (ts) and hold time (th) as specified in

“Electrical Characteristics”.

• Power supply, ground

Separate the analog and digital signals around the device to reduce noise effects. Bypass the power supply

pin to each ground with a 0.1 µF ceramics capacitor as near as possible to the pin for both the digital and

analog signals.

• Latch up

Analog and digital power supplies must be able to share the same power supply of the board. This is to

prevent latch up caused by potential difference between the two pins when the power is turned on.

• IREF

The IREF pin is very sensitive to improve the AC characteristics. Pay attention for capacitance component not

to attach to this pin because its output may become unstable.

• VG pin

It is recommended to use a 1 µF capacitor to improve the AC characteristics though the typical capacitance

value externally connected to the VG pin is 0.1 µF.

• Output full-scale voltage

For the applications using the RGB signal, the color balance may be broken up when the RO, GO and BO

output full-scale voltages are used with not adjustment.

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