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DAC7545KUG4 PDF预览

DAC7545KUG4

更新时间： 2024-01-07 21:54:37
品牌 Logo 应用领域
德州仪器 - TI 光电二极管转换器
页数 文件大小 规格书
9页 221K
描述
CMOS 12-Bit Multiplying D/A Converter, Microprocessor Compatible 20-SOIC -40 to 85

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DAC7545KUG4 技术参数

是否Rohs认证： 符合生命周期：Obsolete
零件包装代码：SOIC包装说明：SOP, SOP20,.4
针数：20Reach Compliance Code：compliant
风险等级：5.33转换器类型：D/A CONVERTER
输入位码：OFFSET BINARY, 2'S COMPLEMENT BINARY输入格式：PARALLEL, WORD
JESD-30 代码：R-PDSO-G20JESD-609代码：e4
长度：12.8 mm最大线性误差 (EL)：0.0244%
湿度敏感等级：3位数：12
功能数量：1端子数量：20
最高工作温度：85 °C最低工作温度：-40 °C
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装等效代码：SOP20,.4封装形状：RECTANGULAR
封装形式：SMALL OUTLINE峰值回流温度（摄氏度）：260
电源：5/15 V认证状态：Not Qualified
座面最大高度：2.65 mm最大稳定时间：2 µs
标称安定时间 (tstl)：2 µs子类别：Other Converters
最大压摆率：2 mA标称供电电压：5 V
表面贴装：YES技术：CMOS
温度等级：INDUSTRIAL端子面层：Nickel/Palladium/Gold (Ni/Pd/Au)
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：7.5 mmBase Number Matches：1

DAC7545KUG4 数据手册

 浏览型号DAC7545KUG4的Datasheet PDF文件第2页浏览型号DAC7545KUG4的Datasheet PDF文件第3页浏览型号DAC7545KUG4的Datasheet PDF文件第4页浏览型号DAC7545KUG4的Datasheet PDF文件第6页浏览型号DAC7545KUG4的Datasheet PDF文件第7页浏览型号DAC7545KUG4的Datasheet PDF文件第8页 
tance. Eliminating this capacitor will result in excessive ringing  
and an increase in glitch energy, therefore, this capacitor must  
be as small as possible to minimize settling time.  
APPLICATIONS  
UNIPOLAR OPERATION  
Figure 2 shows the DAC7545 connected for unipolar opera-  
tion. The high-grade DAC7545 is specified for a 1LSB gain  
error, so gain adjust is typically not needed; however, the  
resistors shown are for adjusting full-scale errors. The value  
of R1 should be minimized to reduce the effects of mismatch-  
ing temperature coefficients between the internal and exter-  
nal resistors. A range of adjustment of 1.5 times the desired  
range will be adequate. For example, for a DAC7545JP, the  
gain error is specified to be ±25LSB, therefore, a range of  
adjustment of ±37LSB will be adequate. Equation 1 results in  
a value of 458W for the potentiometer (use 500Ω).  
The circuit of Figure 2 can be used with input voltages up to  
±20V as long as the output amplifier is biased to handle the  
excursions. Table I represents the analog output for four  
codes into the DAC for Figure 2.  
BIPOLAR OPERATION  
Figure 3 and Table II illustrate the recommended circuit and  
code relationship for bipolar operation. The DAC function uses  
offset binary code. The inverter, U1, on the MSB line converts  
binary two’s complement input code to offset binary code. If the  
inversion is done in software, U1 can be omitted.  
RLADDER  
R1 =  
3 • GainError  
(
)
(1)  
4096  
BINARY CODE  
MSB LSB  
ANALOG OUTPUT  
1111 1111 1111  
1000 0000 0000  
0000 0000 0001  
0000 0000 0000  
–VIN (4095/4096)  
–VIN (2048/4096) = –1/2VIN  
–VIN (1/4096)  
R2  
+5V  
C1  
33pF  
0V  
VIN  
VDD RFB  
VREF  
DAC7545  
TABLE I. Unipolar Codes.  
VOUT  
OUT 1  
AGND  
DGND  
OPA604  
R1  
DATA INPUT  
ANALOG OUTPUT  
MSB  
LSB  
0111 1111 1111  
+VIN (2047/2048)  
+VIN (1/2048)  
0V  
–VIN (1/2048)  
–VIN (2048/2048)  
0000 0000 0001  
0000 0000 0000  
1111 1111 1111  
1000 0000 0000  
DB0-DB11  
FIGURE 2. Unipolar Binary Operation.  
TABLE II. Binary Two’s Complement Code Table for Circuit  
of Figure 3.  
The addition of R1 will cause a negative gain error. To  
compensate for this error, R2 must be added. The value of R2  
should be one-third the value of R1.  
R3, R4, and R5 must match within 0.01% and must be the  
same type of resistors (preferably wire-wound or metal foil),  
so that the temperature coefficients match; mismatch of R3  
value to R4 causes both offset and full-scale error. Mismatch  
of R5 to R4 and R3 causes full-scale error.  
The capacitor across the feedback resistor is used to compen-  
sate for the phase shift due to stray capacitances of the circuit  
board, the DAC output capacitance, and op amp input capaci-  
R2  
R4  
+5V  
20kΩ  
OPA604  
C1  
33pF  
or  
1/2 OPA2604  
18  
VDD  
20  
RFB  
R5  
R3  
10kΩ  
1
20kΩ  
VIN  
OUT 1  
AGND  
19  
VREF  
DAC7545  
DB10-DB0  
VOUT  
R1  
R6  
5kΩ 10%  
DB11  
4
2
OPA604  
or  
1/2 OPA2604  
11  
U1  
(see text)  
Analog Common  
12  
Data Input  
FIGURE 3. Bipolar Operation (binary two’s complement code).  
DAC7545  
SBAS150A  
5
www.ti.com  
123456789

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