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参数资料
| 型号： | MAX191BCWG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 100KSPS W/REF24SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 30 |
| 位数： | 12 |
| 采样率（每秒）： | 100k |
| 数据接口： | MICROWIRE?，并联，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 941mW |
| 电压电源： | 双 ± |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
| 输入数目和类型： | 2 个单端，单极；2 个单端，双极；1 个差分，单极；1 个差分，双极 |
| 产品目录页面： | 1393 (CN2011-ZH PDF) |
MAX191
0.01F and 10F bypass capacitors. Minimize capaci-
tor lead lengths for best supply-noise rejection. If the
+5V power supply is very noisy, a 10
resistor can be
connected as a lowpass filter to filter out supply noise
(Figure 23).
_____________Dynamic Performance
High-speed sampling capability and throughput make
the MAX191 ideal for wideband signal processing. To
support these and other related applications, Fast
Fourier Transform (FFT) test techniques guarantee the
ADC's dynamic frequency response, distortion, and
noise at the rated throughput. Specifically, this involves
applying a low-distortion sine wave to the ADC input
and recording the digital conversion results for a speci-
fied time. The data is then analyzed using an FFT algo-
rithm, which determines its spectral content.
Conversion errors are then seen as spectral elements
outside the fundamental input frequency. FFT plots are
shown in the
Typical Operating Characteristics.
ADCs have traditionally been evaluated by specifica-
tions such as zero and full-scale error, integral nonlin-
earity (INL), and differential nonlinearity (DNL). Such
parameters are widely accepted for specifying perfor-
mance with DC and slowly varying signals, but are less
useful in signal-processing applications where the
ADC’s impact on the system transfer function is the
main concern. The significance of various DC errors
does not translate well to the dynamic case, so different
tests are required.
Signal-to-Noise Ratio (SNR) is the ratio between the
RMS amplitude of the fundamental input frequency to
the RMS amplitude of all other A/D output signals,
except signal harmonics. Signal-to-Noise + Distortion
ratio (SINAD) is the same as the SNR, but includes sig-
nal harmonics.
The theoretical minimum A/D noise is caused by quan-
tization error and is a direct result of the ADC’s resolu-
tion: SNR = (6.02n + 1.76) dB, where n is the number of
bits of resolution. 74dB is the SNR of a perfect 12-bit
ADC.
By transposing the equation that converts resolution to
SNR we can compute the effective resolution or the
“effective number of bits” the ADC provides from the
measured SNR:
n = (SNR – 1.76)/6.02
Total Harmonic Distortion
Total Harmonic Distortion (THD) is the ratio of the RMS
sum of all harmonics of the input signal (in the frequen-
cy band above DC and below one-half the sample rate)
to the fundamental itself. This expressed as:
THD = 20log
[ √(V
2
2 + V32 + V42 + V52 + . . . + Vn2) /V1]
where V1 is the fundamental RMS amplitude and V2 to
Vn are the amplitudes of the 2nd through nth harmonics.
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 fre-
quency. But if the ADC is exceptionally linear, it can
occur at a random peak in the ADC’s noise floor.
Opto-Isolated A/D Interface
Many industrial applications require isolation to prevent
excessive current flow where ground disparities exist
between the ADC and the rest of the system. In Figure
24, a MAX250 and four 6N136 opto-couplers create an
Low-Power, 12-Bit Sampling ADC
with Internal Reference and Power-Down
22
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX191BCWG+ | 功能描述:模数转换器 - ADC 12Bit 100ksps 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 |
| MAX191BCWG+T | 功能描述:模数转换器 - ADC 12Bit 100ksps 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 |
| MAX191BCWG-T | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) 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 |
| MAX191BENG | 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 |
| MAX191BENG+ | 功能描述:模数转换器 - ADC 12Bit 100ksps 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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