TMC3503R2C80 Ver la hoja de datos (PDF) - Fairchild Semiconductor

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componentes Descripción

Fabricante

TMC3503R2C80

Triple Video D/A Converter

Fairchild Semiconductor 

PRODUCT SPECIFICATION

TMC3503

Pin Descriptions (continued)

Pin

Name

RREF

Pin Number

LQFP

PLCC

36

42

Value

590 Ω

COMP

34

40

0.1 µF

Power, Ground

VDD

12, 30, 31 17, 34–36

GND

1, 14, 15,

27, 28, 38,

39, 48

29–32

NC

13, 24, 25,

—

37

+5 V

0.0V

—

Equivalent Circuits

VDD

Pin Function Description

Current-setting Resistor. The full-scale output current of each

D/A converter is determined by the value of the resistor

connected between RREF and GND. The nominal value for

RREF is found from:

RREF = 9.1 (VREF/IFS)

where IFS is the full-scale (white) output current (amps) from the

D/A converter (without sync). Sync is 0.4 IFS.

D/A full-scale (white) current may also be calculated from:

IFS = VFS/RL

Where VFS is the white voltage level and RL is the total resistive

load (ohms) on each D/A converter. VFS is the blank to full-scale

voltage.

Compensation Capacitor. A 0.1 µF ceramic capacitor must be

connected between COMP and VDD to stabilize internal bias

circuitry.

Power Supply.

Ground.

No Connect

VDD

p

Digital

Input

n

n

p

VDD

GND

27014D

GND

Figure 2. Equivalent Digital Input Circuit Figure 3. Equivalent Analog Output Circuit

OUT

27013B

REV. 1.02 11/24/99

5

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