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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)： | 9/16頁 |
| 文件大小： | 179K |
| 代理商： | MP7226LS |
MP7226
9
Rev. 2.00
APPLICATIONS INFORMATION
Power On Reset
At power up, all inputs are reset to 0 V if WR = 1. For WR = 0,
the addressed DAC will receive input data.
Power Supply
The MP7226 can operate with either a single or dual power
supply. Improved zero-code settling error can be obtained by
using dual power supplies. The dual power supply specifica-
tions are a positive supply (V
DD
) range of +10.5V to +16.5V, and
a –5V supply (V
SS
) . The single power supply specifications are
a positive supply (V
DD
) range of +10.5V to +16.5V, or range of
+4.75V to 5.5V . The specified reference voltage (V
REF
) range
under these conditions is from +2V to V
DD
–4V. For those appli-
cations requiring +10V at the output (V
REF
= +10V), V
DD
must
be +14V minimum to meet data sheet limits . 8-bit performance
is guaranteed for single supply operation (V
SS
= 0V); however,
zero code output sink capability is improved with V
SS
= –5V. For
adequate DAC and Buffer operation, V
REF
must always be be-
low V
DD
by at least 3.5V.
Power Supply Decoupling
The Power Supplies used with the MP7226 should be well
regulated and filtered. Local power supply decoupling consist-
ing of a 10
μ
F tantalum capacitor in parallel with a 0.01
μ
F ce-
ramic is recommended. The decoupling capacitors should be
connected between the V
DD
and AGND, and between V
SS
and
AGND if V
SS
= –5V.
Unipolar Output Operation
In this configuration, the reference voltage is the same polar-
ity as the output voltage. Since the reference voltage must al-
ways be positive with respect to GND, the output can only be 0 or
positive.
Table 2.shows the code relationship for the part in unipolar
operation
Table 2. Unipolar Code Table
1
1
1
0
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
1
0
1
1
0
Digital Input
Analog Output, V
OUT
Table 3. Bipolar Code Table
1
1
1
0
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
1
0
1
1
0
Digital Input
Analog Output
0 V
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