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参数资料
| 型号： | TLC7226EDWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | DAC |
| 英文描述： | QUAD, PARALLEL, 8 BITS INPUT LOADING, 8-BIT DAC, PDSO20 |
| 封装： | PLASTIC, SOIC-20 |
| 文件页数： | 21/22页 |
| 文件大小： | 333K |
| 代理商： | TLC7226EDWR |
TLC7226C, TLC7226E
QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTERS
SLAS060B – JANUARY 1995 – REVISED AUGUST 1996
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
AGND bias for direct bipolar output operation
The TLC7226 can be used in bipolar operation without adding more external operational amplifiers as shown
in Figure 1 by biasing AGND to VSS. This configuration provides an excellent method for providing a direct
bipolar output with no additional components. The transfer values are shown in Table 1.
_
+
DAC A
AGND
DGND
TLC7226
REF (Vref = 5 V)
OUT
4
18
2
6
3
VDD = 10 to 15 V
5
VSS
–5 V
Output range
(5 V to – 5 V)
Digital inputs omitted for clarity.
Figure 4. AGND Bias for Direct Bipolar Operation
LSB
MSB
DAC LATCH CONTENTS
ANALOG OUTPUT
) V
ref
127
128
1111
) V
ref
1
128
1000
0001
1000
0000
–V
ref
128
+* V
ref
0111
1111
0000
0001
* V
ref
127
128
0000
0 V
Table 1. Bipolar (Offset Binary) Code
* V
ref
1
128
AGND bias for positive output offset
The TLC7226 AGND terminal can be biased above or below the system ground terminal, DGND, to provide an
offset analog output voltage level. Figure 2 shows a circuit configuration to achieve this for channel A of the
TLC7226. The output voltage, VO, at OUTA can be expressed as:
V
O +
V
BIAS )
D
A
V
I
where DA is a fractional representation of the digital input word (0 ≤ D ≤ 255/256).
(1)
Increasing AGND above system GND reduces the output range. VDD – Vref must be at least 4 V to ensure
specified operation. Since the AGND terminal is common to all four DACs, this method biases up the output
voltages of all the DACs in the TLC7226. Supply voltages VDD and VSS for the TLC7226 should be referenced
to DGND.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TLC7226I | 制造商:TI 制造商全称:Texas Instruments 功能描述:QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTERS |
| TLC7226IDW | 功能描述:数模转换器- DAC Quad DAC 8bit RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| TLC7226IDWG4 | 功能描述:数模转换器- DAC Quad Parallel-In Sngl/Dual Sply RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| TLC7226IDWR | 功能描述:数模转换器- DAC Quad Parallel-In Sngl/Dual Sply RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| TLC7226IDWRG4 | 功能描述:数模转换器- DAC Quad Parallel-In Sngl/Dual Sply RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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