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MAX1400
+5V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
22
______________________________________________________________________________________
Input Buffers
The MAX1400 provides a pair of input buffers to isolate
the inputs from the capacitive load presented by the
PGA/modulator (Figure 6). The buffers are chopper sta-
bilized to reduce the effect of their DC offsets and low-
frequency noise. Since the buffers can represent more
than 50% of the total analog power dissipation, they
may be shut down in applications where minimum
power dissipation is required and the capacitive input
load is not a concern. Disable the buffers in applications
where the inputs must operate close to AGND or V+.
When used in buffered mode, the buffers isolate the
inputs from the sampling capacitors. The sampling-
related gain error is dramatically reduced in this mode.
A small dynamic load remains from the chopper stabi-
lization. The multiplexer exhibits a small input leakage
current of up to 10nA. With high source resistances,
this leakage current may result in a DC offset.
Table 13c. REXT, CEXT Values for Less than 16-Bit Gain Error in Unbuffered (BUFF = 0)
Mode—4x Modulator Sampling Frequency (MF1, MF0 = 10 ); X2CLK = 0; fCLKIN =
2.4576MHz
Table 13d. REXT, CEXT Values for Less than 16-Bit Gain Error in Unbuffered (BUFF = 0)
Mode—8x Modulator Sampling Frequency (MF1, MF0 = 11); X2CLK = 0; fCLKIN =
2.4576MHz
REXT
CEXT
RMUX
CPIN
MUXOUT
ADCIN
RIN
CST
CPIN
CAMP
CSAMPLE
CC
Figure 6. Analog Input, Buffered Mode (BUFF = 1)
9.3
4.5
9.3
4.5
3.0
2
7.2
3.9
5.0
3.1
2.3
8, 16, 32,
64, 128
2.7
3.0
4
1
CEXT = 0pF
CEXT = 50pF
CEXT = 100pF
0.94
0.53
0.94
0.53
0.14
0.87
0.50
0.79
0.45
0.12
0.13
PGA GAIN
0.14
CEXT = 500pF
CEXT = 1000pF
CEXT = 5000pF
EXTERNAL RESISTANCE REXT (k
)
4.5
2.2
4.5
2.2
1.5
2
3.5
1.9
2.4
1.5
1.1
8, 16, 32,
64, 128
1.3
1.5
4
1
CEXT = 0pF
CEXT = 50pF
CEXT = 100pF
0.46
0.26
0.46
0.26
0.069
0.42
0.24
0.38
0.22
0.059
0.069
PGA GAIN
0.069
CEXT = 500pF
CEXT = 1000pF
CEXT = 5000pF
EXTERNAL RESISTANCE REXT (k
)
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相关代理商/技术参数
MAX1400CAI+T 功能描述:模数转换器 - ADC 18-Bit 5Ch 4.8ksps 2.5V 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
MAX1400CAI+W 制造商:Maxim Integrated Products 功能描述:
MAX1400CAI-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
MAX1400EAI 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
MAX1400EAI+ 功能描述:模数转换器 - ADC 18-Bit 5Ch 4.8ksps 2.5V 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
MAX1400EAI+T 功能描述:模数转换器 - ADC 18-Bit 5Ch 4.8ksps 2.5V 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
MAX1400EAI-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
MAX1400EVKIT 制造商:Maxim Integrated Products 功能描述:MAX1402 EVALUATION KIT/EVALUATION SYSTEM - Boxed Product (Development Kits)