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参数资料
| 型号： | MAX1402EAI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 29/38页 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT LP 28-SSOP |
| 产品培训模块： | MAX11200 ADC Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 46 |
| 位数： | 18 |
| 采样率（每秒）： | 480 |
| 数据接口： | QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 34mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 管件 |
| 输入数目和类型： | 3 个差分，单极；3 个差分，双极；5 个伪差分，单极；5 个伪差分，双极 |
| 产品目录页面： | 1396 (CN2011-ZH PDF) |
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MAX1402
+5V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
4–20mA Loop-Powered Transmitters
Low power, single-supply operation, and easy interfac-
ing with optocouplers make the MAX1402 ideal for
loop-powered 4–20mA transmitters. Loop-powered
transmitters draw their power from the 4–20mA loop,
limiting the transmitter circuitry to a current budget of
4mA. Tolerances in the loop further limit this current
budget to 3.5mA. Since the MAX1402 consumes only
250A, a total of 3.25mA remains to power the remain-
ing transmitter circuitry. Figure 18 shows a block dia-
gram for a loop-powered 4–20mA transmitter.
Power Supplies
No specific power sequence is required for the
MAX1402; either the V+ or the VDD supply can come
up first. While the latchup performance of the MAX1402
is good, it is important that power be applied to the
MAX1402 before the analog input signals (AIN_) or the
CLKIN inputs, to avoid latchup. If this is not possible,
then the current flow into any of these pins should be
limited to 50mA. If separate supplies are used for the
MAX1402 and the system digital circuitry, then the
MAX1402 should be powered up first.
3-Wire and 4-Wire
RTD Configurations
Tightly matched 200A current sources compensate for
errors in 3-wire and 4-wire RTD configurations. In the 3-
wire configuration (Figure 19), the lead resistances
result in errors if only one current source is used. The
200
A will flow through RL1 developing a voltage error
between AIN1 and AIN2. An additional current source
compensates for this error by developing an equivalent
voltage across RL2 ensuring the differential voltage at
AIN1 and AIN2 is not affected by lead resistance. This
assumes both leads are of the same material and of
equal length (RL1 = RL2) and OUT1 and OUT2 have
matching tempcos (5ppm/°C). Both current sources will
flow through RL3 developing a common-mode voltage
that will not affect the differential voltage at AIN1 and
AIN2. Using one of the current sources to supply the
reference voltage ensures a more accurate ratiometric
result.
Unlike the 3-wire configuration, the 4-wire configuration
(Figure 20) has no error associated with lead resis-
tances as no current flows in the measurement leads
connected to AIN1 and AIN2. Current source OUT1
provides the excitation current for the RTD and current
source OUT2 provides current to generate the refer-
ence voltage. This reference voltage developed across
RREF ensures that the analog input voltage span
remains ratiometric to the reference voltage. RTD temp-
co errors in the analog input voltage are due to the tem-
DAC
RGAIN
ROFST
RX
VIN+
VIN-
RSENSE
4–20mA LOOP
INTERFACE
RFDBK
RY
CC
ISOLATION
BARRIER
V+
GND
V+
4
SPI
4
SPI
3
SPI
GND
SENSOR
VOLTAGE
REGULATOR
P/C
MAX1402
Figure 18. 4–20mA Transmitter
______________________________________________________________________________________
35
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1402EAI+ | 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 |
| MAX1402EAI+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 |
| MAX1402EAI+TW | 功能描述:ADC / DAC多通道 +5V 18-Bit Low-Power Multichannel Oversampling (Sigma-Delta) ADC RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| MAX1402EAI+W | 功能描述:ADC / DAC多通道 +5V 18-Bit Low-Power Multichannel Oversampling (Sigma-Delta) ADC RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| MAX1402EAI-T | 功能描述:ADC / DAC多通道 RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
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