UPC659AGS-E1 Просмотр технического описания (PDF) - NEC => Renesas Technology

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UPC659AGS-E1

8-BIT A/D CONVERTER FOR VIDEO PROCESSING WITH REFERENCE GENERATOR AND CLAMP CIRCUIT

NEC => Renesas Technology 

µPC659A

Output Code for Analog Input

Analog input

Output digital code

DB1

DB8

OVER (MSB) DB2

DB3

DB4

DB5

DB6

DB7

(LSB)

VRB to 1/2 LSB

0

0

0

0

0

0

0

0

0

1/2 LSB to (1 + 1/2) LSB

0

0

0

0

0

0

0

0

1

to

to

to

to

to

to

to

to

to

to

(254 + 1/2) LSB to (255 + 1/2) LSB

0

1

1

1

1

1

1

1

1

(255 + 1/2) LSB to VRT

1

1

1

1

1

1

1

1

1

VRT to AVCC

1

1

1

1

1

1

1

1

1

Remark

LSB =··

VRT – VRB

256

=·· 3.906 mV TYP., VRB = 2.3 V TYP., VRT = 3.3 V TYP.

APPLICATION CIRCUIT EXAMPLE

22 Ω

15 kΩ 1 kΩ

100 µF

+

AGND

51 Ω

4.7 kΩ

AGND AGND AGND

Clamp pulse

+

2.2 µF

AVCC

(+5 V)

0.01 µF

47 µF

+

2.2 µF

+

1 VRT

2 NC

10 µF

+

3 AVCC

4 VIN

5 AGND

6 PCL

7 VCL

15

kΩ

VR1

20 kΩ

0.01 2 kΩ

µF

+

2.2 µF

8 AVCC

9 AGND

10 VRB

11 AVCC

12 AGND

4fsc Clock input

DGND

CLK 24

OVER 23

DB1 22

DB2 21

DB3 20

DGND 19

DVCC 18

DB4 17

DB5 16

DB6 15

DB7 14

DB8 13

OVER

DB1 to DB8

0.01 µF

+ 47 µF

AGND

DVCC

(+5 V)

DGND AGND

DGND

Remarks 1. VR1: Clamp voltage adjustment

2. Must be thick line wiring for the power supply lines. And reduce the resistance and reactance

ingredient.

AVCC and DVCC must be connected at one point.

AGND and DGND must be connected at one point.

10

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