CXD2044Q 查看數據表（PDF） - Sony Semiconductor

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CXD2044Q

Digital Comb Filter (NTSC/PAL/PAL-M/PAL-N)

Sony Semiconductor 

Application Circuit for the D/A Converter Block

CXD2044Q

0.1µ

29 YVDD

35 YVSS

CLOCK

15 MCK

DVDD

DVSS

0.1µ

37 CVDD

43 CVSS

AYO 31

XAYO 30

0.1µ

YVG 32

Y OUTPUT

200 (R)

YVRF 33

1K

YIRF 34

VB 36

ACO 39

XACO 38

CVG 40

3.3k (R')

0.1µ

C OUTPUT

200 (R)

0.1µ

CVRF 41

1K

CIRF 42

3.3k (R')

• Method of selecting the output resistor

The CXD2044Q has a built-in current output type D/A converter. To obtain the output voltages, connect

resistors to the AYO and ACO pins.

The specs are as follows: output full-scale voltage VFS = 0.5 to 2.0 [V], output full-scale current IFS = 0 to

15 [mA].

Calculate the output resistance value using the relationship VFS = IFS × R. In addition, connect a resistor of 16

times the output resistor to the reference current pin (YIRF, CIRF). In case this results in a non-existent

value, use a resistance value as close to the calculated value as possible.

Note that, at this time, VFS = VRF × 16R/R' (VRF: Pin voltage of YVRF and CVRF). Here, R is the resistor

connected to AYO/ACO, and R' is the resistor connected to YIRF/CIRF. Power consumption can be reduced

by using higher resistance values for the R, but the glitch energy and data settling time increase

contrastingly. Set the optimum values according to the system applications.

• VDD, Vss

Separate the analog and digital systems around the device to reduce the effects of noise. YVDD and CVDD

are by-passed to YVss and CVss, respectively, as close to each other as possible through ceramic

capacitors of approximately 0.1µF.

– 10 –

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