- 您现在的位置：买卖IC网 > PDF目录67348 > 5962R0722601VZA (NATIONAL SEMICONDUCTOR CORP) SERIAL INPUT LOADING, 12.5 us SETTLING TIME, 12-BIT DAC, CDSO10 PDF资料下载
参数资料
| 型号： | 5962R0722601VZA |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | DAC |
| 英文描述： | SERIAL INPUT LOADING, 12.5 us SETTLING TIME, 12-BIT DAC, CDSO10 |
| 封装： | CERAMIC, SOIC-10 |
| 文件页数： | 10/24页 |
| 文件大小： | 502K |
| 代理商： | 5962R0722601VZA |
30018012
FIGURE 8. Microwire Interface
2.2 USING REFERENCES AS POWER SUPPLIES
Recall the need for a quiet supply source for devices that use
their power supply voltage as a reference voltage.
Since the DAC121S101 consumes very little power, a refer-
ence source may be used as the supply voltage. The advan-
tages of using a reference source over a voltage regulator are
accuracy and stability. Some low noise regulators can also be
used for the power supply of the DAC121S101. Listed below
are a few power supply options for the DAC121S101.
2.2.1 LM4130
The LM4130 reference, with its 0.05% accuracy over tem-
perature, is a good choice as a power source for the
DAC121S101. Its primary disadvantage is the lack of 3 V and
5 V versions. However, the 4.096 V version is useful if a 0 to
4.095 V output range is desirable or acceptable. Bypassing
the LM4130 VIN pin with a 0.1 F capacitor and the VOUT
pin with a 2.2 F capacitor will improve stability and reduce
output noise. The LM4130 comes in a space-saving 5-pin
SOT23.
30018013
FIGURE 9. The LM4130 as a power supply
2.2.2 LM4050
Available with accuracy of 0.44%, the LM4050 shunt refer-
ence is also a good choice as a power regulator for the
DAC121S101. It does not come in a 3 Volt version, but 4.096
V and 5 V versions are available. It comes in a space-saving
3-pin SOT23.
30018014
FIGURE 10. The LM4050 as a power supply
The minimum resistor value in the circuit of Figure 10 should
be chosen such that the maximum current through the
LM4050 does not exceed its 15 mA rating. The conditions for
maximum current include the input voltage at its maximum,
the LM4050 voltage at its minimum, the resistor value at its
minimum due to tolerance, and the DAC121S101 draws zero
current. The maximum resistor value must allow the LM4050
to draw more than its minimum current for regulation plus the
maximum DAC121S101 current in full operation. The condi-
tions for minimum current include the input voltage at its
minimum, the LM4050 voltage at its maximum, the resistor
value at its maximum due to tolerance, and the DAC121S101
draws its maximum current. These conditions can be sum-
marized as
R(min) = ( V
IN(max) VZ(min) / (IA(min) + IZ(max))
and
R(max) = ( V
IN(min) VZ(max) / (IA(max) + IZ(min) )
where V
Z(min) and VZ(max) are the nominal LM4050 output
voltages ± the LM4050 output tolerance over temperature, I
Z
(max) is the maximum allowable current through the LM4050,
I
Z(min) is the minimum current required by the LM4050 for
proper regulation, I
A(max) is the maximum DAC121S101 sup-
ply current, and I
A(min) is the minimum DAC121S101 supply
current.
2.2.3 LP3985
The LP3985 is a low noise, ultra low dropout voltage regulator
with a 3% accuracy over temperature. It is a good choice for
applications that do not require a precision reference for the
DAC121S101. It comes in 3.0V, 3.3V and 5V versions, among
others, and sports a low 30 V noise specification at low fre-
quencies. Since low frequency noise is relatively difficult to
filter, this specification could be important for some applica-
tions. The LP3985 comes in a space-saving 5-pin SOT23 and
5-bump micro SMD packages.
www.national.com
18
DAC121S101QML
相关PDF资料 |
PDF描述 |
|---|---|
| 5962R0722701VZA | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDSO16 |
| 5962R0722701VZA | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDSO16 |
| 5962R0724902VXC | 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, CDFP8 |
| 5962R0724903VPC | 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, CDIP8 |
| 5962R0724904QPC | 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, CDIP8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 5962R0722701VZA | 功能描述:模数转换器 - ADC 8-Ch 50 kSPS-1 MSPS RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| 5962R0722902VXA | 功能描述:低压差稳压器 - LDO 3-Terminal Adj Reg RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| 5962R0722961VXA | 功能描述:低压差稳压器 - LDO 3-Terminal Adj Reg RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| 5962R0724902VPC | 制造商:Intersil Corporation 功能描述: |
| 5962R0724904VPC | 制造商:Intersil Corporation 功能描述: |
发布紧急采购，3分钟左右您将得到回复。