TMC3003 datasheet(5/12 Pages) CADEKA

5 / 12 page

PRODUCT SPECIFICATION

TMC3003

REV. 1.0.3 3/5/01

Equivalent Circuits

Figure 2. Equivalent Digital Input Circuit

Figure 3. Equivalent Analog Output Circuit

Voltage Reference

VREF

+1.235 V

Voltage Reference output/input. An internal voltage

source of +1.235 Volts is output on this pin. An external

+1.235 Volt reference may be applied here which

overrides the internal reference. Decoupling VREF to GND

with a 0.1µF ceramic capacitor is required.

RREF

560

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 (in 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 (in 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 and Ground

VDD

18, 33, 34

12, 30, 31

+5 V

Power supply

GND

30, 31

27, 28

0.0 V

Ground

Pin Descriptions (continued)

Pin Name

Pin Number

Value

Description

PLCC

LQFP

Digital

Input

VDD

27014C

GND

OUT

GND

27013B

VDD

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