參數(shù)資料
型號: LTC1458LI
廠商: Linear Technology Corporation
英文描述: Dual General Purpose LinCMOS(TM) Differential Comparator 8-TSSOP 0 to 70
中文描述: 四路12位軌至軌微數(shù)模轉(zhuǎn)換器
文件頁數(shù): 9/12頁
文件大?。?/td> 248K
代理商: LTC1458LI
9
LTC1458/LTC1458L
APPLICATIO
S I
FOR
ATIO
U
Using Two DACs to Digitally Program the Full Scale
and Offset of a Third
Figure 2 shows how to use one LTC1458 to make a 12-bit
DAC with a digitally programmable full scale and offset.
DAC A and DAC B are used to control the offset and full
scale of DAC C. DAC A is connected in a
×
1 configuration
and controls the offset of DAC C by moving REFLO C above
ground. The minimum value to which this offset can be
programmed is 10mV. DAC B is connected in a
×
2
configuration and controls the full scale of DAC C by
driving REFHI C. Note that the voltage at REFHI C must be
less than or equal to V
CC
/2, corresponding to DAC B’s code
W
U
U
2,500 for V
CC
= 5V, since DAC C is being operated in
×
2
mode for full rail-to-rail output swing.
The transfer characteristic is:
V
OUTC
= 2 [D
C
(2 D
B
– D
A
) + D
A
] REFOUT
where REFOUT = The Reference Output
D
A
= (DAC A Digital Code)/4096
This sets the offset.
D
B
= (DAC B Digital Code)/4096
This sets the full scale.
D
C
= (DAC C Digital Code)/4096
V
CC
X1/X2 B
V
OUT B
CLR
REFHI B
GND
REFLO B
REFLO A
REFHI A
REFOUT
NC
V
OUT A
X1/X2 A
V
CC
X1/X2 C
V
OUT C
CS/LD
D
IN
REFHI C
GND
REFLO C
REFLO D
REFHI D
D
OUT
CLK
NC
V
OUT D
X1/X2 D
LTC1458
LTC1458L
0.1
μ
F
V
OUT
5V
1458 F02
500
Figure 2
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