LTC1450L View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1450L' PDF : 16 Pages View PDF
LTC1450/LTC1450L
TYPICAL APPLICATIONS N
DIN
FROM µP
DATA BUS
FROM µP AND
DECODE LOGIC
FROM
SYSTEM RESET
Bipolar Output 12-Bit DAC
5V
0.1µF
VREF
10k
10k
DATA (0:11) VCC REFOUT REFLO*
5V
3+
7
LT ®1097
2–
4
– 5V
6 VOUT
– 2.048V TO 2.047V
(1mV/LSB)
CSLSB
2.047V
CSMSB
WR
LDAC
CLR
LTC1450
GND
VDAC 10k
10k
VOUT
VOUT
X1/X2
REFHI*
( ) VOUT = 2.048 +
DIN – 4096
4096
4.096
– 2.048V
*REFLO IS TIED TO REFOUT AND
REFHI IS TIED TO GND
TYING REFLO TO REFOUT AND REFHI TO GND IN THIS
APPLICATION OVERCOMES THE NEED FOR A PULL-DOWN
RESISTOR ON THE REFOUT PIN. REFOUT SEES A CONSTANT
LOAD TO GND INDEPENDENT OF VOUT
2048 4095 DIN
LTC1450/50L • TA05
DIN
FROM µP
DATA BUS
FROM µP AND
DECODE LOGIC
FROM
SYSTEM RESET
Digitally Programmable Bilateral Current Source/Sink
VREF
VCC
0.1µF
DATA (0:11)
CSLSB
CSMSB
WR
LDAC
CLR
VCC REFOUT
LTC1450
GND
R6
R1
20k 20k
R2
22.6k
15V
REFHI
VOUT
X1/X2
REFLO
2–
7
2.047mA
6
LT1097
IOUT
3+
4
R5
– 2.048mA
R3
–15V R4
1.13k
VDAC 20k
21.5k
IOUT
– 2.048mA TO 2.047mA
(1µA/LSB)
( ) IOUT =
DIN
4096
•
4.096
–
VREF
R2
(R1)(R5)
R1 = R3
R2 = R4 + R5
ZOUT
=
(R1)(R5)(R3 + R4)
(R2)(R3) – R1(R4 + R5)
2048 4095 DIN
LTC1450/50L • TA06
12
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