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參數(shù)資料
| 型號： | AD7808BRZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 17/28頁 |
| 文件大小： | 0K |
| 描述： | IC DAC 10BIT OCTAL SRL 24-SOIC |
| 產品培訓模塊： | Data Converter Fundamentals DAC Architectures |
| 標準包裝： | 31 |
| 設置時間： | 1.5µs |
| 位數(shù)： | 10 |
| 數(shù)據(jù)接口： | 串行 |
| 轉換器數(shù)目： | 4 |
| 電壓電源： | 模擬和數(shù)字 |
| 功率耗散（最大）： | 99mW |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 24-SOIC W |
| 包裝： | 管件 |
| 輸出數(shù)目和類型： | 8 電壓，雙極 |
| 采樣率（每秒）： | 667k |
| 產品目錄頁面： | 785 (CN2011-ZH PDF) |
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AD7804/AD7805/AD7808/AD7809
REV. A
–24–
APPLICATIONS
Opto-Isolated Interface for Process Control Applications
The AD7804/AD7808 has a versatile serial three-wire serial
interface making it ideal for generating accurate voltages in
process control and industrial applications. Due to noise, safety
requirements, or distance, it may be necessary to isolate the
AD7804/AD7808 from the controller. This can easily be
achieved by using opto-isolators which will provide isolation in
excess of 3 kV. The serial loading structure of the AD7804/
AD7808 makes it ideally suited for use in opto-isolated appli-
cations. Figure 41 shows an opto-isolated interface to the
AD7804/AD7808 where SDIN, CLKIN and
FSIN are driven
from optocouplers.
LDAC is hardwired low to reduce the number
of interface lines and this ensures that each DAC is updated follow-
ing the sixteenth serial clock of a write cycle.
AD7804/
AD7808
AVDD
VDD1
VOUTA
VOUTB
VOUTC
VOUTD
AGND
DGND
LDAC
CLR
CLKIN
DVDD
REFIN
0.1 F
10 F
REFOUT
+5V
REGULATOR
CLKIN
VDD
10k
FSIN
SDIN
DATA
POWER
1 TO 10nF
VDD
10k
VDD
10k
Figure 41. AD7804/AD7808 Opto-Isolated Interface
Decoding Multiple AD7808s
The
FSIN pin on the AD7808s can be used in applications to
decode a number of DACs. In this application all DACs in the
system receive the same serial clock and serial data, but only the
FSIN to one of the DACs will be active at any one time allowing
access to eight channels in this thirty-two channel system. The
74HC139 is used as a 2- to 4-line decoder to address any of the
DACs in the system. To prevent timing errors from occurring
the enable input should be brought to its inactive state while the
coded address inputs are changing state. Figure 42 shows a
system decoding multiple AD7808s in a multichannel system.
ENABLE
74HC139
AD7808
FSIN
SDIN
CLKIN
AD7808
FSIN
SDIN
CLKIN
AD7808
FSIN
SDIN
CLKIN
LDAC
SDIN
CLKIN
DGND
CODED
ADDRESS
1
G
1A
1B
1Y0
1Y1
1Y2
1Y3
VCC
VDD
AD7808
FSIN
SDIN
CLKIN
LDAC
Figure 42. Decoding Multiple AD7808s Using the
FSIN Pin
AD7805 As a Digitally Programmable Window Detector
A digitally programmable upper/lower limit detector using two
DACs in the AD7805 is shown in Figure 43. The upper and
lower limits for the test are loaded to DACs A and B that in
turn set the limits on the CMP04. If a signal at the VIN input is
not within the programmed window an LED will indicate the
fail condition. Only one limit detector is shown below but can
easily be adapted for a dual channel system by using the extra
DACs on the AD7805 and the two unused comparators on the
CMP04.
+5V
0.01 F
AD7805
AVDD
DVDD
VOUTA
VOUTB
VOUTC
VOUTD
AGND
DGND
LDAC
CLR
COMP
MODE
D9
D0
CS
WR
DVDD
0.1 F
10 F
0.01 F
PASS/
FAIL
1k
FAIL
1k
PASS
1/2
CMP04
1/6
74HC05
VIN
Figure 43. Digitally Programmable Window Detector
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相關代理商/技術參數(shù) |
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|---|---|
| AD7808BRZ-REEL | 功能描述:IC DAC 10BIT OCTAL SRL 24-SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉換器 系列:- 產品培訓模塊:Data Converter Fundamentals DAC Architectures 標準包裝:750 系列:- 設置時間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 電壓電源:雙 ± 功率耗散（最大）:100mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-LCC（J 形引線） 供應商設備封裝:28-PLCC（11.51x11.51） 包裝:帶卷 (TR) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
| AD7808BST | 制造商:AD 制造商全稱:Analog Devices 功能描述:+3.3 V to +5 V Quad/Octal 10-Bit DACs(300.12 k) |
| AD7809 | 制造商:AD 制造商全稱:Analog Devices 功能描述:+3.3 V to +5 V Quad/Octal 10-Bit DACs |
| AD7809BST | 制造商:Analog Devices 功能描述:DAC 8-CH 10-bit 44-Pin TQFP 制造商:Rochester Electronics LLC 功能描述:OCTAL 10-BIT PARALLEL DAC I.C. - Bulk 制造商:Analog Devices 功能描述:IC 10-BIT DAC |
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