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PCM56UG4 PDF预览

PCM56UG4

更新时间： 2024-02-09 04:39:48
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
14页 261K
描述
Series Input 16-Bit Monolithic Digital-to-Analog Converter 16-SOIC

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PCM56UG4 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, SOP16,.4
针数：16Reach Compliance Code：compliant
风险等级：5.17最大模拟输出电压：3 V
最小模拟输出电压：-3 V转换器类型：D/A CONVERTER
输入位码：2'S COMPLEMENT BINARY输入格式：SERIAL
JESD-30 代码：R-PDSO-G16JESD-609代码：e4
长度：10.3 mm湿度敏感等级：3
标称负供电电压：-5 V位数：16
功能数量：1端子数量：16
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：SOP
封装等效代码：SOP16,.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/+-12 V认证状态：Not Qualified
座面最大高度：2.65 mm标称安定时间 (tstl)：1.5 µs
子类别：Other Converters最大压摆率：17 mA
标称供电电压：5 V表面贴装：YES
技术：CMOS温度等级：COMMERCIAL
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 mm
Base Number Matches：1

PCM56UG4 数据手册

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The THD is defined as the ratio of the square root of the sum  
of the squares of the values of the harmonics to the value of  
the fundamental input frequency and is expressed in percent  
or dB. The rms value of the PCM56 error referred to the  
input can be shown to be:  
1.0  
0.3  
Voltage  
Output  
Mode  
Current  
Output  
Mode  
0.1  
n
0.03  
0.01  
0.003  
0.001  
2
(1)  
=
1/n  
EL (i) + E Q (i)  
∑
rms  
i = 1  
RL = 200Ω  
where n is the number of samples in one cycle of any given  
sine wave, EL(i) is the linearity error of the PCM56 at each  
sampling point, and EQ(i) is the quantization error at each  
sampling point. The THD can then be expressed as:  
0.01  
0.1  
Settling Time (µs)  
1.0  
10.0  
THD =  
/ E rms  
FIGURE 3. Full Scale Range Settling Time vs Accuracy.  
rms  
n
2
STABILITY WITH TIME AND TEMPERATURE  
(2)  
1/n  
EL (i) + E Q (i)  
∑
The parameters of a D/A converter designed for audio  
applications should be stable over a relatively wide  
temperature range and over long periods of time to avoid  
undesirable periodic readjustment. The most important  
parameters are Bipolar Zero Error, Differential Linearity  
Error, and Total Harmonic Distortion. Most of the Offset  
and Gain drift with temperature or time is due to the drift of  
the internal reference zener diode. The PCM56 is designed  
so that these drifts are in opposite directions so that the  
Bipolar Zero voltage is virtually unaffected by variations in  
the reference voltage. Both DLE and THD are dependent  
upon the matching and tracking of resistor ratios and upon  
VBE and hFE of the current-source transistors. The PCM56  
was designed so that any absolute shift in these components  
has virtually no effect on DLE or THD. The resistors are  
made of identical links of ultra-stable nichrome thin-film.  
The current density in these resistors is very low to further  
enhance their stability.  
i = 1  
X
=
100%  
Erms  
where Erms is the rms signal-voltage level.  
This expression indicates that, in general, there is a correlation  
between the THD and the square root of the sum of the  
squares of the linearity errors at each digital word of interest.  
However, this expression does not mean that the worst-case  
linearity error of the D/A is directly correlated to the THD.  
For the PCM56 the test period was chosen to be 22.7µs  
(44.1kHz), which is compatible with the EIAJ STC-007  
specification for PCM audio. The test frequency is 991Hz  
and the amplitude of the input signal is 0dB, –20dB, and  
–60dB down from full scale.  
Figure 4 shows the typical THD as a function of output  
voltage.  
Figure 5 shows typical THD as a function of frequency.  
DYNAMIC RANGE  
The Dynamic Range is a measure of the ratio of the smallest  
signals the converter can produce to the full-scale range and  
is usually expressed in decibels (dB). The theoretical dynamic  
range of a converter is approximately 6 x n, or about 96dB  
of a 16-bit converter. The actual, or useful, dynamic range is  
limited by noise and linearity errors and is therefore somewhat  
less than the theoretical limit. However, this does point out  
that a resolution of at least 16 bits is required to obtain a  
90dB minimum dynamic range, regardless of the accuracy  
of the converter. Another specification that is useful for  
audio applications is Total Harmonic Distortion.  
10.0  
1.0  
14 Bits  
0.1  
0.01  
16 Bits  
TOTAL HARMONIC DISTORTION  
0.001  
–60  
–50  
–40  
–30  
–20  
–10  
0
THD is useful in audio applications and is a measure of the  
magnitude and distribution of the Linearity Error, Differential  
Linearity Error, and Noise, as well as Quantization Error. To  
be useful, THD should be specified for both high level and  
low level input signals. This error is unadjustable and is the  
most meaningful indicator of D/A converter accuracy for  
audio applications.  
VOUT (dB)  
0dB = Full Scale Range (FSR)  
FIGURE 4. Total Harmonic Distortion (THD) vs VOUT  
.
®
5
PCM56  
12345678...14

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