TMC3503 datasheet(5/14 Pages) CADEKA

5 / 14 page

PRODUCT SPECIFICATION

TMC3503

REV. 1.02 11/24/99

Equivalent Circuits

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

RREF

590

Ω

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.

COMP

0.1 µF

Compensation Capacitor. A 0.1 µF ceramic capacitor must be

connected between COMP and VDD to stabilize internal bias

circuitry.

Power, Ground

VDD

12, 30, 31 17, 34–36

+5 V

Power Supply.

GND

1, 14, 15,

27, 28, 38,

39, 48

29–32

0.0V

Ground.

13, 24, 25,

——

No Connect

Name

Pin Number

Value

Pin Function Description

LQFP

PLCC

OUT

GND

27013B

VDD

Digital

Input

VDD

27014D

GND

Pin Descriptions (continued)

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