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LTC1669CS5

更新时间： 2024-01-10 13:39:59
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
12页 186K
描述
10-Bit Rail-to-Rail Micropower DAC with I2C Interface

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LTC1669CS5 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：SOT包装说明：VSSOP, TSOP5/6,.11,37
针数：5Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.08最大模拟输出电压：5.5 V
最小模拟输出电压：转换器类型：D/A CONVERTER
输入位码：BINARY输入格式：SERIAL
JESD-30 代码：R-PDSO-G5JESD-609代码：e3
长度：2.9 mm最大线性误差 (EL)：0.2441%
湿度敏感等级：1位数：10
功能数量：1端子数量：5
最高工作温度：70 °C最低工作温度：
封装主体材料：PLASTIC/EPOXY封装代码：VSSOP
封装等效代码：TSOP5/6,.11,37封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH峰值回流温度（摄氏度）：260
电源：3/5 V认证状态：Not Qualified
座面最大高度：1 mm标称安定时间 (tstl)：30 µs
子类别：Other Converters最大压摆率：0.125 mA
标称供电电压：3 V表面贴装：YES
技术：CMOS温度等级：COMMERCIAL
端子面层：Matte Tin (Sn)端子形式：GULL WING
端子节距：0.95 mm端子位置：DUAL
处于峰值回流温度下的最长时间：30宽度：1.625 mm
Base Number Matches：1

LTC1669CS5 数据手册

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LTC1669  
U
W U U  
APPLICATIONS INFORMATION  
SYNC Address/Quick Command  
Rail-to-Rail Output Considerations  
As in any rail-to-rail device, the output is limited to  
voltages within the supply range.  
In addition to the slave address, the LTC1669 has an  
address that can be shared by other devices so that they  
may be updated synchronously. The address is called to  
the SYNC address and uses the quick command protocol.  
If the DAC offset is negative, the output for the lowest  
codes limits at 0V as shown in Figure 1b.  
The SYNC Address is 1111 110  
Similarly, limiting can occur near full scale when VCC is  
used as the reference. If VREF = VCC and the DAC full-scale  
error (FSE) is positive, the output for the highest codes  
limits at VCC as shown in Figure 1c. No full-scale limiting  
can occur if the internal reference is used.  
1
7
1
1
1
Start 1111 110  
SYNC Address  
SY/CLR  
Ack  
Stop  
1669 TA05  
SY/CLR  
1
0
Update output latches on rising edge of SCL during  
Acknowledge of SYNC Address  
Clear all internal latches on rising edge of SCL during  
Acknowledge of SYNC Address  
Offset and linearity are defined and tested over the region  
of the DAC transfer function where no output limiting can  
occur.  
Internal Reference  
The SY/CLR bit set high only has meaning when the “SY”  
bit of the command byte was previously set HIGH. On the  
otherhand, the SY/CLR bit set LOW will always clear the  
part, independent of the state of the “SY” bit in the  
command byte.  
In applications where a predictable output is required that  
is independent of supply voltage, the LTC1669 has a user-  
selectable internal reference. Selecting the internal refer-  
ence will set the full-scale output voltage to 2.5V. This can  
be useful in applications where the supply voltage is  
poorly regulated.  
Voltage Output  
The output amplifier contained in the LTC1669 can source  
or sink up to 5mA. The output stage swings to within a few  
millivolts of either supply rail when unloaded and has an  
equivalentoutputresistanceof85Ωwhendrivingaloadto  
the rails. The output amplifier is stable driving capacitive  
loads up to 1000pF.  
Using the LT®1460 Micropower Series Reference as a  
Power Supply for the LTC1669  
In applications where the advantages of using the internal  
reference are required but the full-scale range needs to be  
greater than 2.5V, an external series reference can be  
used. The LT1460 is ideal for use as a power supply for the  
LTC1669 and can provide 3V, 3.3V and 5V full-scale  
output voltage ranges. The LT1460 provides accuracy,  
noiseimmunityandextendedsupplyrangetotheLTC1669  
when the LTC1669 is operated ratiometric to VCC. Since  
both parts are available in SOT-23 packages, the PC board  
space for this application is extremely small. See Figure 2.  
A small resistor placed in series with the output can be  
used to achieve stability for any load capacitance greater  
than 1000pF. For example, a 0.1µF load can be driven by  
theLTC1669ifa110Ωseriesresistanceisused.Thephase  
margin of the resulting circuit is 45° and increases mono-  
tonically from this point if larger values of resistance, ca-  
pacitance or both are substituted for the values given.  
1669f  
9
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