參數(shù)資料
型號: LTC1657
廠商: Linear Technology Corporation
英文描述: Parallel 16-Bit Rail-to-Rail Micropower DAC(并行16位,微功耗滿幅度電壓輸出數(shù)模轉(zhuǎn)換器)
中文描述: 并行16位軌至軌微數(shù)模轉(zhuǎn)換器(并行16位,微功耗滿幅度電壓輸出數(shù)模轉(zhuǎn)換器)
文件頁數(shù): 10/12頁
文件大?。?/td> 166K
代理商: LTC1657
10
LTC1657
TYPICAL APPLICATIO S
This circuit shows how to make a bipolar output 16-bit
DAC with a wide output swing using an LTC1657 and an
LT1077. R1 and R2 resistively divide down the LTC1657
output and an offset is summed in using the LTC1657
onboard 2.048V reference and R3 and R4. R5 ensures that
This circuit shows a digitally programmable current source
from an external voltage source using an external op amp,
an LT1218 and an NPN transistor (2N3440). Any digital
word from 0 to 65535 is loaded into the LTC1657 and its
output correspondingly swings from 0V to 4.096V. This
voltage will be forced across the resistor R
A
. If R
A
is
chosen to be 412
, the output current will range from
0mA at zero scale to 10mA at full scale. The minimum
voltage for V
S
is determined by the load resistor R
L
and
Q1’s V
CESAT
voltage. With a load resistor of 50
, the
voltage source can be 5V.
0.1
μ
F
5V
1657 TA04
5V < V
S
< 100V
FOR R
L
50
Q1
2N3440
R
A
412
1%
R
L
I
OUT
=
0mA TO 10mA
(D
IN
)(4.096)
(65536)(R
A
)
DATA (0:15)
CSLSB
CSMSB
WR
LDAC
CLR
GND
V
CC
REFOUT
REFHI
REFLO
X1/X2
LTC1657
μ
P
7
6
4
26
21
20
22
23
25
3
5:19
2
3
1
28
27
2
V
OUT
+
LT1218
Digitally Programmable Current Source
A Wide Swing, Bipolar Output 16-Bit DAC
the onboard reference is always sourcing current and
never has to sink any current even when V
OUT
is at full
scale. The LT1077 output will have a wide bipolar output
swing of –4.096V to 4.096V as shown in the figure below.
With this output swing, 1LSB = 125
μ
V.
DATA (0:15)
CSLSB
CSMSB
WR
LDAC
CLR
0.1
μ
F
24
25
7
6
4
26
21
20
22
23
3
5:19
2
3
1
28
27
2
V
CC
V
OUT
GND
REFHI REFOUT
REFLO
X1/X2
R1
100k
1%
5V
LTC1657
1657 TA05
+
LT1077
5V
–5V
R2
200k
1%
R3
100k
1%
R5
100k
1%
R4
200k
1%
(2)(D
IN
)(4.096)
65536
V
OUT
:
– 4.096V
D
IN
V
OUT
4.096
–4.096
32768
0
65535
TRANSFER CURVE
μ
P
相關(guān)PDF資料
PDF描述
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LTC1659 12-Bit Rail-to-Rail Micropower DAC in MSOP Package(12位,微功耗滿幅度電壓輸出數(shù)模轉(zhuǎn)換器(8腳MSOP封裝))
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