TMC3533 데이터 시트보기 (PDF) - Fairchild Semiconductor
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TMC3533 Datasheet PDF : 12 Pages
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PRODUCT SPECIFICATION
TMC3533
Pin Descriptions (continued)
Pin
Name
RREF
Pin Number
LQFP
PLCC
36
42
Value
572 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
+3.3 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),
but is optimized to be 572 Ω. IFS is the full-scale (white) output
current (amps) from an output without sync. Sync current 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. 0.9.1 11/24/99
5
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