参数资料
型号: AD561KD
厂商: Analog Devices Inc
文件页数: 8/8页
文件大小: 0K
描述: IC DAC 10BIT 5-15V IN MONO 16DIP
产品培训模块: Data Converter Fundamentals
DAC Architectures
标准包装: 1
设置时间: 250ns
位数: 10
数据接口: 并联
转换器数目: 1
电压电源: 双 ±
工作温度: 0°C ~ 70°C
安装类型: 通孔
封装/外壳: 16-CDIP(0.300",7.62mm)
供应商设备封装: 16-CDIP 侧面铜焊
包装: 管件
输出数目和类型: 1 电流,单极;1 电流,双极
采样率(每秒): *
AD561
–8–
REV. A
C394e–1–5/97
PRINTED
IN
U.S.A.
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
16-Pin Ceramic Package
D-16
16-Pin Plastic Package
N-16
Figure 9. Fast Precision Analog to Digital Converter
A much faster converter can be constructed by using higher
performance external components. Each individual high-order
bit settles in less than 250 ns; the low-order bits in less than
200 ns. Because of this, a staged clock, which speeds up for
lower bits will improve the speed. Also, a faster comparator and
Schottky TTL or ECL logic would be necessary. 10-bit convert-
ers in the 3
s to 5 s range could be built around the AD561
with these techniques.
DIGITAL 4-TO-20 mA OR 1-TO-5 VOLT CONVERTER
A direct digital 4-to-20 mA or 1-to-5 volt line driver can be built
with the AD561 as shown in Figure 10. The 2.5 volt reference is
divided to provide 1 volt at the op amp noninverting input – thus a
zero input code results in a 1 volt output at the Darlington emitter
(VOUT). The 2 k feedback resistance converts the nominal 2 mA
(
± 20%) full-scale output from the AD561 to 4 volts, for a
total output of 5 volts FS. The voltage at the emitter forces a
proportional current through the 250
(which appears at the
collector as IOUT) The AD561 current is added to the 4–20 mA
line; thus 5 volts full scale gives 22 mA in the current loop. For
exactly 20 mA, trim the 1 k pot for 4.5 V FS. (A single op amp
circuit will not produce both 1 to 5 volt and
4-to-20 mA outputs simultaneously.)
Figure 10. Digital 4-to-20 mA or 1-to-5 Volt Line Driver
DIGITALLY PROGRAMMABLE SETPOINT
COMPARATOR
Figure 11 demonstrates a high accuracy systems-oriented
setpoint comparator. The 2.5 volt reference is buffered and
amplified by the AD741K to produce an exact 10.000 volt
reference which could be used as a primary system reference for
several such circuits. The +10 volt compliance of the AD561
then allows it to generate a zero to +10 volt output swing
through the 5 k
application resistor without an additional op
amp. The digital code for this system will be complementary
binary (all 1s give 0.00 volts out).
Figure 11. Digitally Programmable Set-Point Comparator
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