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参数资料
| 型号： | MAX195BCWE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT 85KSPS 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 位数： | 16 |
| 采样率（每秒）： | 85k |
| 数据接口： | QSPI?，串行，SPI? |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 80mW |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个单端，单极；1 个单端，双极 |
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MAX195
16-Bit, 85ksps ADC with 10A Shutdown
24
______________________________________________________________________________________
Total Harmonic Distortion
If a pure sine wave is input to an ADC, AC integral non-
linearity (INL) of an ADC’s transfer function results in
harmonics of the input frequency being present in the
sampled output data.
Total Harmonic Distortion (THD) is the ratio of the RMS
sum of all the harmonics (in the frequency band above
DC and below one-half the sample rate, but not includ-
ing the DC component) to the RMS amplitude of the
fundamental frequency.
This is expressed as follows:
where V1 is the fundamental RMS amplitude, and V2
through VN are the amplitudes of the 2nd through Nth
harmonics. The THD specification in the
Electrical
Characteristics includes the 2nd through 5th harmon-
ics. In the MAX195, this distortion is caused primarily
by the changes in on-resistance of the AIN sampling
switches with changing input voltage. These resis-
tance changes, together with the DAC’s capacitance
(which can also vary with input voltage), cause a
varying time delay for AC signals, which causes sig-
nificant distortion at moderately high frequencies
(Figure 28).
Spurious-Free Dynamic Range
Spurious-free dynamic range is the ratio of the funda-
mental RMS amplitude to the amplitude of the next
largest spectral component (in the frequency band
above DC and below one-half the sample rate).
Usually, this peak occurs at some harmonic of the input
frequency. However, if the ADC is exceptionally linear,
it may occur only at a random peak in the ADC’s noise
floor.
Transfer Function
Figures 29 and 30 show the MAX195’s transfer func-
tions. In unipolar mode, the output data is in binary for-
mat and in bipolar mode it is offset binary.
THD = 20log
V2
+ V3
+ V4
+ ...+ V
V1
2
N
2
18
0
8021
14
MAX195
FG27
OUTPUT CODE (HEXADECIMAL)
OCCURRENCES
OF
OUTPUT
CODE
(THOUSANDS)
8024
6
2
4
8
12
16
8022 8023
8026
10
8025
8027
NO AVERAGING
IDEAL
CONVERSION
RUNNING
AVERAGE OF
5 SAMPLES
VREF = +4.5V
VAIN = +2.25V
UNIPOLAR MODE
85ksps
10
12
11
13
14
15
16
0.1
1
10
100
MAX195-26
FREQUENCY (kHz)
EFFECTIVE
BITS
fS = 85kHz
TA = +25°C
Figure 27. Histogram of 16,384 Conversions Shows Effects of
Noise and Averaging
Figure 26. Effective Bits vs. Input Frequency
100
60
65
0.1
10
100
70
75
80
85
90
95
MAX195-28
FREQUENCY (kHz)
SINAD
(dB)
1
fS = 85kHz
TA = +25°C
Figure 28. Signal-to-Noise + Distortion vs. Frequency
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX195BEPE | 功能描述:模数转换器 - ADC 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 |
| MAX195BEPE+ | 功能描述:模数转换器 - ADC 16-Bit 85ksps 5V Precision ADC 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 |
| MAX195BEPE+T | 制造商:Maxim Integrated Products 功能描述:16-BIT, 85KSPS ADC WITH 10?A SHUTDOWN - Tape and Reel |
| MAX195BEWE | 功能描述:模数转换器 - ADC 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 |
| MAX195BEWE+ | 功能描述:模数转换器 - ADC 16-Bit 85ksps 5V Precision ADC 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 |
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