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參數(shù)資料
| 型號： | AD7809 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | +3.3 V to +5 V Quad/Octal 10-Bit DACs |
| 中文描述： | 3.3伏至5伏四/八通道10位DAC |
| 文件頁數(shù)： | 17/28頁 |
| 文件大?。?/td> | 300K |
| 代理商： | AD7809 |
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AD7804/AD7805/AD7808/AD7809
–17–
REV. A
Table VII shows the twos complement transfer function for the
Sub DAC. Figure 23 shows the Sub DAC transfer function for
twos complement coding. Any Sub DAC output voltage can be
expressed as:
V
OUT
" =
V
BIAS
/16
×
(
NB
/256)
where NB is the decimal equivalent of the twos complement
input code. NB ranges from –128 to +127.
Table VII. Twos Complement Code Table for Sub DAC
Digital Input
MSB . . . LSB
Analog Input
01111111
01111111
00000001
00000000
11111111
10000001
10000000
(V
BIAS
/16)
×
(127/256)
(V
BIAS
/16)
×
(126/256)
(V
BIAS
/16)
×
(1/256)
0
(–V
BIAS
/16)
×
(1/256)
(–V
BIAS
/16)
×
(127/256)
(–V
BIAS
/16)
×
(128/256)
127
V
BIAS
256 16
0
D
128
V
BIAS
256 16
80
81
DAC INPUT CODE
FF
00
01
7E
7F
Figure 23. Sub DAC Output Voltage vs. DAC Input Codes
(HEX) for Twos Complement Coding
The total output for a single channel when using twos comple-
ment coding is the sum of the voltage from the Main DAC and
the Sub DAC.
V
OUT
=
V
OUT
' +
V
OUT
"
=
V
BIAS
+ 1.875
×
V
BIAS
×
(
NA
/1024) +
V
BIAS
/16
×
(
NB
/256)
=
V
BIAS
×
(1 + 1.875
×
NA
/1024 +
NB
/4096)
where NA ranges from –512 to +511 and NB ranges from –128 to
+127. Figure 28 shows a pictorial view of the transfer function for
any DAC.
Configuring the AD7805/AD7809 for Twos Complement Coding
Figure 24 shows a typical configuration for the AD7805/AD7809.
The circuit can be used for either 3.3 V or 5 V operation and uses
the internal V
DD
/2 as the reference for the part and 10-bit paral-
lel interfacing is used. The following are the steps required to
operate the Main DACs in this part.
0.01
m
F
AD7805/
AD7809
AV
DD
DV
DD
V
OUT
A
V
OUT
B
V
OUT
C
V
OUT
D
AGND
DGND
LDAC
CLR
COMP
MODE
CS
WR
D9
D0
DV
DD
REFIN
REFOUT
0.1
m
F
0.1
m
F
10
m
F
A1
A0
0.01
m
F
A2*
*USED ON THE
AD7809 ONLY
DIGITAL
INTERFACE
+3.3V/+5V
Figure 24. Typical Configuration for AD7805/AD7809
System Control Register Write:
MODE = 0, address inputs (A2, A1, A0) are don’t cares.
Write 020 Hex
Configure part for 10-bit parallel, twos
complement coding, normal operation
Channel Control Register Write:
MODE = 0, address inputs (A2, A1, A0) select desired channel.
Write 011 Hex
Internal V
DD
/2 selected as V
for
DAC, and any DAC data writes that
follow are to the Main DAC.
DAC Data Register Write:
MODE = 1, address inputs (A2, A1, A0) select desired channel.
Write XXX Hex
With MODE = 1 all data writes are to
the selected DAC. XXX is the required
data. 200 Hex will give zero scale and 1FF
Hex will give full scale from the DAC.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD7804 | +3.3 V to +5 V Quad/Octal 10-Bit DACs |
| AD7804BN | ECONOLINE: REC2.2-S_DRW(Z)/H* - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- 4.5-9V, 9-18V, 18-36V, 36-72V Wide Input Range 2 : 1- UL94V-0 Package Material- Continuous Short Circiut Protection- Cost Effective- 100% Burned In- Efficiency to 84% |
| AD7804BR | +3.3 V to +5 V Quad/Octal 10-Bit DACs |
| AD7805BN | %2B3.3V to %2B5V Quad/Octal 10-Bit DACs |
| AD7805BR | %2B3.3V to %2B5V Quad/Octal 10-Bit DACs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| AD7809BST-REEL | 制造商:Analog Devices 功能描述:DAC 8-CH 10-bit 44-Pin TQFP T/R |
| AD7809BSTZ | 功能描述:IC DAC 10BIT OCTAL PARALL 44TQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 設(shè)置時間:4µs 位數(shù):12 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-uMAX 包裝:管件 輸出數(shù)目和類型:2 電壓，單極 采樣率（每秒）:* 產(chǎn)品目錄頁面:1398 (CN2011-ZH PDF) |
| AD7809BSTZ-REEL | 功能描述:IC DAC 10BIT OCTAL PARALL 44TQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Fundamentals DAC Architectures 標(biāo)準(zhǔn)包裝:750 系列:- 設(shè)置時間:7µs 位數(shù):16 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)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(yīng)商設(shè)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 |
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