CXD2306 Ver la hoja de datos (PDF) - Sony Semiconductor

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componentes Descripción

Fabricante

CXD2306

10-bit 80MSPS 1ch D/A Converter

Sony Semiconductor 

CXD2306Q

Notes on Operation

• Selecting the Output Resistance

CXD2306Q is a current output type D/A converter. To create the output voltage, connect the resistor to the

current output pin IO.

Specifications:

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

Output full-scale current IFS = 10 or less [mA]

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

resistance to the reference current 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 × 16 ROUT/RIR

VREF is the voltage set at the VREF pin, ROUT is the resistor to be connected to the current output pin IO 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 settling time. Set the best values

according to the purpose of use.

• Correlation between Data and Clock

For CXD2306Q 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 and 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 supply 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.

• SREF

The SREF is an independent regulated voltage source. By connecting it to the VREF, stable output

amplitudes that do not depend on fluctuations in the power supply can be obtained.

In this case, as VFS = VSR × 16ROUT/RIR, set the VFS according to RIR. Where VSR is the output voltage of

SREF. Do not use this pin as the reference power supply for other IC because this pin is for the exclusive

use of the CXD2306Q.

• IO pin

The IO pin is the inverted current output pin described in the Pin Description. The sum of the currents output

from the IO pin and the IO pin becomes the constant value for any input data.

However, the performances such as the linearity error of the IO pin output current is not guaranteed.

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