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参数资料
| 型号： | MAX194BEPE |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | ADC |
| 英文描述： | Fixed-Point Digital Signal Processor 532-FCBGA |
| 中文描述： | 1-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP16 |
| 封装： | PLASTIC, DIP-16 |
| 文件页数： | 6/24页 |
| 文件大小： | 223K |
| 代理商： | MAX194BEPE |
M
Calibration
In an ideal DAC, each of the capacitors associated with
the data bits would be exactly twice the value of the
next smaller capacitor. In practice, this results in a
range of values too wide to be realized in an economi-
cally feasible size. The capacitor array actually consists
of two arrays, which are capacitively coupled to reduce
the LSB array’s effective value. The capacitors in the
MSB array are production trimmed to reduce errors.
Small variations in the LSB capacitors contribute
insignificant errors to the 14-bit result.
Unfortunately, trimming alone does not yield 14-bit per-
formance or compensate for changes in performance
due to changes in temperature, supply voltage, and
other parameters. For this reason, the MAX194 includes
a calibration DAC for each capacitor in the MSB array.
These DACs are capacitively coupled to the main DAC
output and offset the main DAC’s output according to
the value on their digital inputs. During calibration, the
correct digital code to compensate for the error in each
MSB capacitor is determined and stored. Thereafter,
the stored code is input to the appropriate calibration
DAC whenever the corresponding bit in the main DAC
is high, compensating for errors in the associated
capacitor.
The MAX194 calibrates automatically on power-up. To
reduce the effects of noise, each calibration experiment
is performed many times and the results are averaged.
Calibration requires about 14,000 clock cycles, or
8.2ms at the highest clock (CLK) speed (1.7MHz). In
addition to the power-up calibration, bringing
RESET
low halts MAX194 operation, and bringing it high again
initiates a calibration (Figure 2).
14-Bit, 85ksps ADC with 10μA S hutdown
6
_______________________________________________________________________________________
LSB
MSB
AIN
REF
AGND
DUMMY
SUB-LSBs
32,768C
16,384C
4C
2C
C
C
EOC
CLK
RESET
CALIBRATION
BEGINS
CALIBRATION
ENDS
MAX194
OPERATION HALTS
t
CAL
t
RCS
t
RCH
Figure 1. Capacitor DAC Functional Diagram
Figure 2. Initiating Calibration
相关PDF资料 |
PDF描述 |
|---|---|
| MAX194BEWE | 14-Bit, 85ksps ADC with 10A Shutdown |
| MAX194BMDE | 14-Bit, 85ksps ADC with 10A Shutdown |
| MAX195ACDE | 16-Bit, 85ksps ADC with 10レA Shutdown |
| MAX195AEDE | 16-Bit, 85ksps ADC with 10レA Shutdown |
| MAX195BCWE | 16-Bit, 85ksps ADC with 10レA Shutdown |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX194BEPE+ | 功能描述:模数转换器 - ADC 14Bit 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 |
| MAX194BEWE | 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 |
| MAX194BEWE+ | 功能描述:模数转换器 - ADC 14Bit 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 |
| MAX194BEWE+T | 功能描述:模数转换器 - ADC 14Bit 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 |
| MAX194BEWE-T | 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 |
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