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參數(shù)資料
| 型號(hào)： | SP9843KS |
| 英文描述： | 8-Bit Octal, 4-Quadrant Multiplying, BiCMOS DAC |
| 中文描述： | 8位八路，4象限乘法，BiCMOS工藝援 |
| 文件頁(yè)數(shù)： | 6/10頁(yè) |
| 文件大?。?/td> | 134K |
| 代理商： | SP9843KS |
262
LAST
D
0
LSB
DATA
ADDRESS
D
1
D
2
D
3
D
4
D
5
D
6
D
7
M
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
DAC Output Voltage
V
OUT
=
128
–2V
REF
L
A
0
LSB
A
1
A
2
A
3
M
A
3
0
0
0
0
0
0
0
0
1
1
A
2
0
0
0
0
1
1
1
1
0
0
.
.
1
A
1
0
0
1
1
0
0
1
1
0
0
.
.
1
A
0
0
1
0
1
0
1
0
1
0
1
.
.
1
DAC Updated
FIRST
.
.
1
0
0
0
1
1
1
1
0
0
1
0
0
1
1
0
0
1
0
0
1
1
0
0
1
0
0
1
1
0
0
1
0
0
.
.
.
1
1
0
0
1
0
0
1
1
0
0
1
0
0
1
1
0
1
1
0
1
0
1
No Operation
DACA
DACB
DACC
DACD
DACE
DACF
DACG
DACH
No Operation
.
No operation
.
.
.
D
V
(
V
V
IN
REFL
REF
1
)
+
Table 1. Serial Input Decoded Truth Table
In reality, it is possible to define a DC voltage as a
signal ground in a single supply system. If the DAC's
V
pin is driven to the voltage chosen as pseudo–
ground, then each voltage output will exhibit 4–
quadrant behavior with respect to pseudoground. For
codes greater than 128, the output voltage will enter
the quadrant below the pseudoground voltage when
the input voltage goes below pseudoground. For
codes less than 128, the output voltage will be below
pseudoground when the input is above pseudoground.
When V
is driven to some positive voltage and
V
(X) is grounded, the device performs as if it
were a buffered trimpot tied between ground and
a voltage equal to two times V
. This mode of
operation can be used as an "inverted single–
quadrant" source with an approximate range of 0 to
(V
*2)Volts. Because the output voltage will
decrease as the code is increased, this mode is
considered to be inverted with respect to normal
single–quadrant operation. Note that the mini-
mum output voltage will be 1LSB above V
IN
(X).
Figure 2a
and
2b
show "inverted single–quadrant"
and 4–quadrant performance of the
SP9840/9843
.
very precise when describing a system which runs
from a single positive supply. Traditionally, the quad-
rants have been defined with respect to 0V. A two–
quadrant multiplying DAC could produce negative
output voltages only if a negative voltage reference
were applied. A four–quadrant device could also
produce a code–controlled negative output from a
positive reference, or a code–controlled positive out-
put from a negative reference. If ground is used to
delineate the quadrants, then the
SP9840/SP9843
should be considered single–quadrant multiplying
devices, as their output op amps cannot produce
voltages below ground.
–
+
DAC
3
V
REFL
+5V
V
DD
V
IN
(X)
V
OUT
V
D
128
V
V
V
OUT
IN
REFL
REFL
=
+
(
)
1
Figure 1. DAC and Output Amplifier Circuit
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