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参数资料
| 型号： | LMP90078MHX/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封装： | LEAD FREE, PLASTIC, MO-153, TSSOP-28 |
| 文件页数： | 14/62页 |
| 文件大小： | 1721K |
| 代理商： | LMP90078MHX/NOPB |
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16.0 Functional Description
Throughout this datasheet, the LMP90080/LMP90079/
LMP90078/LMP90077 will be referred to as the LMP900xx.
The LMP900xx is a low-power 16-Bit
ΣΔ ADC with 4 fully dif-
ferential / 7 single-ended analog channels for the LMP90080/
LMP90079 and 2 full differential / 4 single-ended for the
LMP90078/LMP90077. Its serial data output is two’s comple-
ment format. The output data rate (ODR) ranges from 1.6775
SPS to 214.65 SPS.
The serial communication for LMP900xx is SPI, a syn-
chronous serial interface that operates using 4 pins: chip
select bar (CSB), serial clock (SCLK), serial data in (SDI), and
serial data out / data ready bar (SDO/DRYDYB).
True continuous built-in offset and gain background calibra-
tion is also available to improve measurement accuracy. Un-
like other ADCs, the LMP900xx’s background calibration can
run without heavily impacting the input signal. This unique
technique allows for positive as well as negative gain calibra-
tion and is available at all gain settings.
The registers can be found in Section 18.0 Registers, and a
detailed description of the LMP900xx are provided in the fol-
lowing sections.
16.1 SIGNAL PATH
16.1.1 Reference Input (VREF)
The differential reference voltage VREF (VREFP – VREFN)
sets the range for VIN.
The muxed VREF allows the user to choose between VREF1
or VREF2 for each channel. This selection can be made by
programming the VREF_SEL bit in the CHx_INPUTCN reg-
isters (CHx_INPUTCN: VREF_SEL). The default mode is
VREF1. If VREF2 is used, then VIN6 and VIN7 cannot be
used as inputs because they share the same pin.
Refer to Section 17.2.2 VREF for VREF applications infor-
mation.
16.1.2 Flexible Input MUX (VIN)
LMP900xx provides a flexible input MUX as shown in Figure
3. The input that is digitized is VIN = VINP – VINN; where
VINP and VINN can be any availablie input.
The digitized input is also known as a channel, where
CH = VIN = VINP – VINN. Thus, there are a maximum of 4
differential channels: CH0, CH1, CH2, and CH3 for the
LMP90080/LMP90079. The LMP90078/LMP90077 has 2 dif-
ferential channels: CH0 and CH1 because it does not have
the VIN3, VIN4, and VIN5 pins.
LMP900xx can also be configured single-endedly, where the
common ground is any one of the inputs. There are a maxi-
mum of 7 single-ended channels: CH0, CH1, CH2, CH3, CH4,
CH5, and CH6 for the LMP90080/LMP90079 and 4: CH0,
CH1, CH2, CH3 for the LMP90078/LMP90077.
The input MUX can be programmed in the CHx_INPUTCN
registers. For example on the LMP90080, to program CH0 =
VIN = VIN4 – VIN1, go to the CH0_INPUTCN register and set:
1. VINP = 0x4
2. VINN = 0x1
30169777
FIGURE 3. Simplified VIN Circuitry
21
www.national.com
LMP90080/LMP90079/LMP90078/LMP90077
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMP90079 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Sensor AFE System: Multi-Channel, Low-Power 16-Bit |
| LMP90079MH/NOPB | 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 |
| LMP90079MHE/NOPB | 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 |
| LMP90079MHX/NOPB | 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 |
| LMP90080 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Sensor AFE System: Multi-Channel, Low-Power 16-Bit |
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