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参数资料
| 型号： | FMS3125KRC |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | DAC |
| 英文描述： | TRIPLE, PARALLEL, WORD INPUT LOADING, 10-BIT DAC, PQFP48 |
| 封装： | LQFP-48 |
| 文件页数： | 8/12页 |
| 文件大小： | 143K |
| 代理商： | FMS3125KRC |
PRODUCT SPECIFICATION
FMS3110/3115/3120/3125
REV. 1.03 9/19/00
5
Voltage Reference
VREF
35
+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 0.1F ceramic capacitor is required.
RREF
36
560
Current-Setting Resistor. Full-scale output current of each D/A
converter is determined by the value of the resistor connected
between RREF and GND. Nominal value of 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
34
0.1 F
Compensation Capacitor. A 0.1 F ceramic capacitor must be
connected between COMP and VDD to stabilize internal bias circuitry.
Power and Ground
VDD
12, 30, 31
+5 V
Power Supply.
GND
27, 28
0.0V
Ground.
Pin Descriptions (continued)
Pin Name
Pin Number
Value
Description
Equivalent Circuits
Figure 2. Equivalent Digital Input Circuit
Figure 3. Equivalent Analog Output Circuit
Digital
Input
VDD
p
n
GND
VDD
np
GND
OUT
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