- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376562 > DAC7821IRGPT (Texas Instruments, Inc.) 12-Bit, Parallel Input, Multiplying Digital-to-Analog Converter PDF資料下載
參數(shù)資料
| 型號(hào)： | DAC7821IRGPT |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 12-Bit, Parallel Input, Multiplying Digital-to-Analog Converter |
| 中文描述： | 12位，并行輸入，乘法數(shù)字到模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 1597K |
| 代理商： | DAC7821IRGPT |
www.ti.com
THEORY OF OPERATION
R
R
R
R
2R
2R
2R
2R
2R
DB0
(LSB)
DB9
DB10
DB11
(MSB)
I
1
OUT
R
FB
V
REF
I
2
OUT
V
OUT
V
REF
CODE
4096
(1)
OPA277
DAC7821
15V
V+
V
-
-
15V
GND
I
1
OUT
R
FB
V
REF
V
DD
V
DD
V
OUT
I
2
OUT
DAC7821
SBAS365A–OCTOBER 2005–REVISED FEBRUARY 2006
The DAC7821 is a single channel current output, 12-bit digital-to-analog converter (DAC). The architecture,
illustrated in
Figure 25
, is an R-2R ladder configuration with the three MSBs segmented. Each 2R leg of the
ladder is either switched to I
OUT
1 or the I
OUT
2 terminal. The I
OUT
1 terminal of the DAC is held at a virtual GND
potential by the use of an external I/V converter op amp. The R-2R ladder is connected to an external reference
input V
REF
that determines the DAC full-scale current. The R-2R ladder presents a code-independent load
impedance to the external reference of 10 k
±
20%. The external reference voltage can vary over a range of
–15 V to +15 V, thus providing bipolar I
current operation. By using an external I/V converter and the
DAC7821 R
FB
resistor, output voltage ranges of –V
REF
to V
REF
can be generated.
Figure 25. Equivalent R-2R DAC Circuit
When using an external I/V converter and the DAC7821 R
FB
resistor, the DAC output voltage is given by
Equation 1
:
Each DAC code determines the 2R leg switch position to either GND or I
OUT
. Because the DAC output
impedance as seen looking into the I
OUT
1 terminal changes versus code, the external I/V converter noise gain
will also change. Because of this, the external I/V converter op amp must have a sufficiently low offset voltage
such that the amplifier offset is not modulated by the DAC I
OUT
1 terminal impedance change. External op amps
with large offset voltages can produce INL errors in the transfer function of the DAC7821 as a result of offset
modulation versus DAC code.
For best linearity performance of the DAC7821, an op amp with a low input offset voltage (OPA277) is
recommended (see
Figure 26
). This circuit allows V
REF
swinging from –10 V to +10 V.
Figure 26. Voltage Output Configuration
11
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DAC80-CBI-I | Monolithic 12-Bit DIGITAL-TO-ANALOG CONVERTERS |
| DAC80 | Monolithic 12-Bit DIGITAL-TO-ANALOG CONVERTERS |
| DAC8012KU-BI | 12-Bit Digital-to-Analog Converter |
| DAC80-CBI-V | Monolithic 12-Bit DIGITAL-TO-ANALOG CONVERTERS |
| DAC80-CBI-V-BI | Monolithic 12-Bit DIGITAL-TO-ANALOG CONVERTERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC7822 | 制造商:BB 制造商全稱:BB 功能描述:Dual, 12-Bit, Parallel Input, Multiplying Digital-to-Analog Converter |
| DAC7822IRTAR | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 12-bit Dual Channel Par Input Mult 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(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC7822IRTARG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 12-bit Dual Channel Par Input Mult 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(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC7822IRTAT | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 12-bit Dual Channel Par Input Mult 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(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC7822IRTATG4 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 12-bit Dual Channel Par Input Mult 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(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。