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參數(shù)資料
| 型號： | MP7226LS |
| 廠商： | EXAR CORP |
| 元件分類： | DAC |
| 英文描述： | BiCMOS Fixed, Quad, Voltage Output, Single or Dual Supply 8-Bit Digital-to-Analog Converter |
| 中文描述： | QUAD, PARALLEL, 8 BITS INPUT LOADING, 8-BIT DAC, PDSO20 |
| 封裝： | 0.300 INCH, SOP-20 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 179K |
| 代理商： | MP7226LS |
MP7226
10
Rev. 2.00
V
REF
V
REF
V
OUT
V
SS
AGND
DAC
–
+
V
OUT
R2
R1
V
OUT
= D
n
X V
REF
X (1+R2/R1) – V
REF
X R2/R1
if R1 = R2
V
OUT
= V
REF
X (2D
n
– 1)
Where D
n
is the digital input code and can vary from 0 to 255
Figure 5. Bipolar Output Circuit
–
+
Bipolar Binary Operation
The Bipolar Mode configuration for each DAC requires one
external op-amp and two resistors per channel.
Figure 5.shows a typical Bipolar Operation circuit using the
MP7226. Table 3.shows the code relationship for the circuit of
Figure 5.assuming R1 = R2 .
AC Reference Signal
An AC signal can be applied to the reference of the MP7226
for multiplying capability within the upper (+10V) and lower
(+2V) limits of the reference voltage input, with either single or
dual supplies . This signal must be level shifted or AC coupled
with proper bias level before being applied to the reference in-
put. Figure 6.shows techniques for applying an AC signal to the
MP7226. Since all four DACs share a common reference, they
will all share this AC modulated reference. Input frequencies up
to 50kHz will typically be distorted less than 0.1% .
V
REF
V
DD
V
OUT
–5 V or GND
AGND
DAC
–
+
R1
Figure 6. AC Reference Input Signal Circuit (AC Couple)
–
+
R2
C
AC
Reference
Input
+4 V
–4 V
+15 V
DC
Offset
+10 V
+2 V
DC
OFFSET
= V
DD
(+15) X R2/R1+R2
V
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