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參數(shù)資料
| 型號： | AD565ATQ |
| 英文描述： | 12-Bit Digital-to-Analog Converter |
| 中文描述： | 12位數(shù)字到模擬轉換器 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 152K |
| 代理商： | AD565ATQ |
AD565A/AD566A
REV. D
–
10
–
FIGURE 6. OTHER VOLTAGE RANGES
The AD566A can also be easily configured for a unipolar 0 volt
to +5 volt range or
±
2.5 volt and
±
10 volt bipolar ranges by
using the additional 5k application resistor provided at the 20
volt span R terminal, Pin 11. For a 5 volt span (0 V to +5 V or
±
2.5 V), the two 5k resistors are used in parallel by shorting Pin
11 to Pin 9 and connecting Pin 10 to the op amp output and the
bipolar offset resistor either to ground for unipolar or to V
REF
for the bipolar range. For the
±
10 volt range (20 volt span) use
the 5k resistors in series by connecting only Pin 11 to the op
amp output and the bipolar offset connected as shown. The
±
10 volt option is shown in Figure 6.
19.95k
20k
0.5mA
I
REF
DAC
I
OUT
=
4 I
REF
CODE
AD566A
9.95k
5k
8k
I
O
20V SPAN
10V SPAN
DAC
OUT
POWER
GND
–
V
EE
REF
GND
BIPOLAR OFF
5k
CODE
INPUT
LSB
MSB
R2
5k
10pF
AD509
2.4k
7.5V
E
AD561
–
V
REF
IN
R1
5k
14k
*
THE PARALLEL COMBINATION OF THE BIPOLAR OFFSET RESISTOR
AND R3 ESTABLISHES A CURRENT TO BALANCE THE MSB CURRENT.
THE EFFECT OF TEMPERATURE COEFFICIENT MISMATCH BETWEEN
THE BIPOLAR RESISTOR COMBINATION AND DAC RESISTORS IS
EXPANDED ON PREVIOUS PAGE.
R3
26k *
Fgure 6.
±
10 V Voltage Output
Table I. Digital Input Codes
DIGITAL INPUT
MSB
ANALOG OUTPUT
Offset Binary
LSB
Straight Binary
Twos Compl.*
0 0 0 0 0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1 1 1 1 1
1 0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1 1 1
Zero
Mid Scale – 1 LSB
+1/2 FS
+FS – l LSB
–FS
Zero – 1 LSB
Zero
+ FS – 1 LSB
Zero
+FS – 1 LSB
–FS
Zero – 1 LSB
*Inverts the MSB of the offset binary code with an external inverter to obtain
twos complement.
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