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參數(shù)資料
| 型號： | DAC7621E |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 電可擦除可編程邏輯器件 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 458K |
| 代理商： | DAC7621E |
9
DAC7621
The digital data into the DAC7621 is double-buffered. This
means that new data can be entered into the DAC without
disturbing the old data and the analog output of the con-
verter. At some point after the data has been entered into the
serial shift register, this data can be transferred into the DAC
register. This transfer is accomplished with a HIGH to LOW
transition of the LOADDAC pin. However, the LOADDAC
pin makes the DAC register transparent. If new data be-
comes available on the bus register while LOADDAC is
LOW, the DAC output voltage will change as the data
changes. To prevent this, CS must be returned HIGH prior
to changing data on the bus.
At any time, the contents of the DAC register can be set to
000
H
(analog output equals 0V) by taking the CLR input
LOW. The DAC register will remain at this value until CLR
is returned HIGH and LOADDAC is taken LOW to allow
the contents of the input register to be transferred to the
DAC register. If LOADDAC is LOW when CLR is taken
LOW, the DAC register will be set to 000
H
and the analog
output driven to 0V. When CLR is returned HIGH, the DAC
register and the analog output will respond accordingly.
DIGITAL-TO-ANALOG CONVERTER
The internal DAC section is a 12-bit voltage output
device that swings between ground and the internal ref-
erence voltage. The DAC is realized by a laser-trimmed
R-2R ladder network which is switched by N-channel
MOSFETs. The DAC output is internally connected to
the rail-to-rail output operational amplifier.
OPERATION
The DAC7621 is a 12-bit digital-to-analog converter (DAC)
complete with an input shift register, DAC register, laser-
trimmed 12-bit DAC, on-board reference, and a rail-to-rail
output amplifier. Figure 1 shows the basic operation of the
DAC7621.
INTERFACE
Figure 1 shows the basic connection between a
microcontroller and the DAC7621. The interface consists of
a Read/Write (R/W), data, and a load DAC signal
(LOADDAC). In addition, a chip select (CS) input is avail-
able to enable the DAC7621 when there are multiple de-
vices. The data format is Straight Binary. An asynchronous
clear input (CLR) is provided to simplify start-up or periodic
resets. Table I shows the relationship between input code
and output voltage.
DAC7621 Full-Scale Range = 4.095V
Least Significant Bit = 1mV
DIGITAL INPUT CODE
STRAIGHT OFFSET BINARY
ANALOG OUTPUT
(V)
DESCRIPTION
FFF
H
801
H
800
H
7FF
H
000
H
+4.095
+2.049
+2.048
+2.047
0
Full Scale
Midscale + 1 LSB
Midscale
Midscale – 1 LSB
Zero Scale
TABLE I. Digital Input Code and Corresponding Ideal
Analog Output.
FIGURE 1. Basic Operation of the DAC7621.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CLR
V
DD
V
OUT
AGND
DGND
DB11
DB10
DB9
DB8
DB7
LOADDAC
CS
R/W
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DAC7621E
Load DAC
Chip Select
Read/Write
10
μ
F
+5V
Clear
Data Bus
Data Bus
0V to
+4.095V
0.1
μ
F
+
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DAC7621EB | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
| DAC7624 | 12-Bit Quad Voltage Output DIGITAL-TO-ANALOG CONVERTER |
| DAC7625 | 30 AMP MINIATURE POWER RELAY |
| DAC7625UB | OSC 5V SMT 7X5 CMOS PROGRM |
| DAC7624P | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC7621E | 制造商:Texas Instruments 功能描述:IC 12BIT DAC SMD 7621 SSOP20 |
| DAC7621E | 制造商:BURR-BROWN 功能描述:IC 12BIT DAC SMD 7621 SSOP20 制造商:BURR-BROWN 功能描述:IC, 12BIT DAC, SMD, 7621, SSOP20 |
| DAC7621E | 制造商:Texas Instruments 功能描述:12BIT DAC SMD 7621 SSOP20 762 制造商:Texas Instruments 功能描述:12BIT DAC, SMD, 7621, SSOP20, 762 |
| DAC7621E/1K | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 12-Bit Para Input RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC7621E/1KG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 12-Bit Para Input RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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