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參數(shù)資料
| 型號(hào)： | AS1505-T |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | DAC |
| 英文描述： | Octal 8-bit Zero-Scale Setting; Package Type: SOIC(150mil)-16 |
| 中文描述： | 八進(jìn)制8位可編程低功耗DAC的具有關(guān)斷和中間刻度重置 |
| 封裝： | SOIC(150mil)-16 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 471K |
| 代理商： | AS1505-T |
www.austriamicrosystems.com
Revision 1.0
13 - 17
AS1504/AS1505
Data Sheet
- Application Information
Figure 20. Output Buffering
Increasing Output Voltage Swing
An external amplifier can be used to extend the output voltage swing beyond the power supply rails of the AS1504/
AS1505. This design allows for a simple digital interface to the DAC, while expanding the output swing to take advan-
tage of higher voltage external power supplies (e.g., DAC 1 of
Figure 21
is configured to swing from -5 to +5V). The
actual output voltage is given by:
V
OUT
= (1+ (R
F
/R
S
))((D/256)5V) - 5V
(EQ 3)
Where:
D is the DAC input value (i.e., 0 to 255).
This design can be combined with the circuit in
Figure 20
if very accurate adjustments around 0V are required.
Figure 21. Increasing Output Voltage Swing
DAC 2 (non-inverting A
V
= 2 configuration) of
Figure 21
increases the available output swing to +10V. The feedback
resistors can be adjusted to provide scaling of the output voltage, within the limits of the external operational amplifier
power supplies.
–
+
V
H
AS1504/
AS1505
GND
V
REFL
V
DD
V
L
V
H
V
L
V
H
V
L
V
REFH
Amplifier
–
+
100k
Ω
R
1
Simple Buffer
0 to 5V
Summer Circuit with
Fine Trim Adjustment
+5V
DAC1
DAC2
DAC3
DAC1
OUT1
DAC2
AS1504/
AS1505
GND
V
REFL
AS1505
Only
OUT2
–
+
100k
Ω
100k
Ω
0 to +10V
–
+
100k
Ω
-5 to +4.98V
100k
Ω
V
DD
V
REFH
+5V
-5V
+12V
R
F
R
S
+5V
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