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參數資料
| 型號： | AD7805BR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | %2B3.3V to %2B5V Quad/Octal 10-Bit DACs |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 1.5 us SETTLING TIME, 10-BIT DAC, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數： | 17/28頁 |
| 文件大小： | 300K |
| 代理商： | AD7805BR |
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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
BIAS
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.
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| AD7805BR-REEL | 制造商:Analog Devices 功能描述:DAC 4-CH 10-bit 28-Pin SOIC W T/R 制造商:Analog Devices 功能描述:DAC 4-CH 10-BIT 28SOIC W - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:QUAD 10-BIT PARALLEL DAC - Tape and Reel |
| AD7805BRS | 功能描述:IC DAC 10BIT QUAD PARALL 28-SSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 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:16 數據接口:并聯 轉換器數目: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) 輸出數目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:143k |
| AD7805BRS-REEL | 制造商:Analog Devices 功能描述:DAC 4-CH 10-bit 28-Pin SSOP T/R 制造商:Analog Devices 功能描述:DAC 4-CH 10-BIT 28SSOP - Tape and Reel |
| AD7805BRS-REEL7 | 制造商:Analog Devices 功能描述:DAC 4-CH 10-bit 28-Pin SSOP T/R |
| AD7805BRSZ | 功能描述:IC DAC 10BIT QUAD PARALL 28-SSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 標準包裝:1 系列:- 設置時間:4.5µs 位數:12 數據接口:串行，SPI? 轉換器數目:1 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOICN 包裝:剪切帶 (CT) 輸出數目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:* 其它名稱:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
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