參數(shù)資料
型號(hào): AD7226KRZ-REEL
廠商: Analog Devices Inc
文件頁(yè)數(shù): 4/16頁(yè)
文件大?。?/td> 0K
描述: IC DAC 8BIT QUAD W/AMP 20SOIC
產(chǎn)品培訓(xùn)模塊: Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝: 1,000
設(shè)置時(shí)間: 4µs
位數(shù): 8
數(shù)據(jù)接口: 并聯(lián)
轉(zhuǎn)換器數(shù)目: 4
電壓電源: 雙 ±
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 20-SOIC W
包裝: 帶卷 (TR)
輸出數(shù)目和類(lèi)型: 4 電壓,單極;4 電壓,雙極
采樣率(每秒): 143k
REV.
–12–
AD7226
OFFSET ADJUST
Figure 17 shows how the AD7226 can be used to provide pro-
grammable input offset voltage adjustment for the AD544 op
amp. Each output of the AD7226 can be used to trim the input
offset voltage on one AD544. The 620 k
W resistor tied to 10 V
provides a fixed bias current to one offset node. For symmetri-
cal adjustment, this bias current should equal the current in the
other offset node with the half-full scale code (i.e., 10000000)
on the DAC. Changing the code on the DAC varies the bias
current and hence provides offset adjust for the AD544. For
example, the input offset voltage on the AD544J, which has a
maximum of
±2 mV, can be programmably trimmed to ±10 mV.
DAC A
VREF
VDD
DGND
AGND
VSS
VOUTA
AD7226*
*DIGITAL INPUTS OMITTED
FOR CLARITY
620k
500k
+15V
–15V
1
4
5
7
+10V
Figure 17. Offset Adjust for AD544
WR
A1
A0
AD7226*
ADDRESS/DATA BUS
ADDRESS BUS
ADDRESS
DECODE
WR
EN
DB7
DB0
8212
DS2
ALE
D7
D0
A8
A15
*LINEAR CIRCUITRY OMITTED FOR CLARITY
8085A
Figure 18. AD7226 to 8085A Interface
WR
A1
A0
AD7226*
DATA BUS
ADDRESS BUS
ADDRESS
DECODE
R/
W
EN
DB7
DB0
D7
D0
A0
A15
*LINEAR CIRCUITRY OMITTED FOR CLARITY
EN
E
6809
Figure 19. AD7226 to 6809 Interface
WR
A1
A0
AD7226*
DATA BUS
ADDRESS BUS
ADDRESS
DECODE
R/
W
EN
DB7
DB0
D7
D0
A0
A15
*LINEAR CIRCUITRY OMITTED FOR CLARITY
EN
2
6502
Figure 20. AD7226 to 6502 Interface
WR
A1
A0
AD7226*
DATA BUS
ADDRESS BUS
ADDRESS
DECODE
WR
EN
DB7
DB0
D7
D0
A0
A15
*LINEAR CIRCUITRY OMITTED FOR CLARITY
Z-80
Figure 21. AD7226 to Z-80 Interface
D
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