參數(shù)資料
型號(hào): AD421BRZRL7
廠商: Analog Devices Inc
文件頁(yè)數(shù): 5/14頁(yè)
文件大小: 0K
描述: IC DAC 16BIT LOOP 4-20MA 16SOIC
產(chǎn)品培訓(xùn)模塊: Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝: 1
設(shè)置時(shí)間: 8ms
位數(shù): 16
數(shù)據(jù)接口: 串行
轉(zhuǎn)換器數(shù)目: 1
電壓電源: 單電源
功率耗散(最大): 450mW
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 16-SOIC W
包裝: 標(biāo)準(zhǔn)包裝
輸出數(shù)目和類型: 1 電流,單極
其它名稱: AD421BRZRL7DKR
AD421
–13–
REV. C
Battery Backup
Figure 19 shows an application circuit for the AD421 where the
micro and memory sections of the circuitry are protected against
losing data if the loop is broken. The backup circuit switches
from VCC to battery voltage without a glitch when VCC power is
lost. The IRFF9113 acts as a current source during normal
operation and provides a constant charging current to the supercap
or Nicad. The loss of VCC drops the IRFF9113’s gate voltage to
zero volts, which allows the battery or supercaps current to flow
through the MOSFETs channel and integral body diode to
provide power for the micro and memory sections. To calibrate
this circuit, connect an ammeter in series with the battery or
supercap. Then with VCC and the load present adjust the 100 k
potentiometer for the battery charging current recommended by
the battery or supercap manufacturer.
Nonrechargeable batteries should not be used in this application
due to danger of explosion.
100k
IN3611
DN25D
VCC
DRIVE
LOOP
RTN
COM
AD421*
VLOOP
IRFF9113
SUPERCAP
VCC
GND
MICRO/
MEMORY
*ADDITIONAL CIRCUITRY OMITTED FOR CLARITY
4.7 F
0.1 F
2.2 F
Figure 19. Battery Backup Circuit
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