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参数资料
| 型号： | MAX1368ECM+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 30/36页 |
| 文件大小： | 0K |
| 描述： | IC PANEL METER 3.5 DIG 48LQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 250 |
| 显示器类型： | LED |
| 配置： | 7 段显示 |
| 接口： | 串行 |
| 数字或字符： | A/D，3.5 位数字 |
| 电源电压： | 2.7 V ~ 5.25 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 托盘 |
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Microcontroller-Interface, 4.5-/3.5-Digit Panel
Meters with 4–20mA Output
In either internal or external reference operation,
bypass REF_DAC with a 0.1μF capacitor to GND.
Choose a reference with output impedance (load regu-
lation equivalent) of 100m ? or less, such as the
MAX6126. For best performance, use an external
source from the ADC and DAC.
Offset Calibration
The MAX1366/MAX1368 offer on-chip offset calibration.
The device offset calibrates during every conversion
when the OFFSET_CAL1 bit is zero in the control regis-
ter. Enhanced offset calibration is only needed in the
MAX1366 when the RANGE bit = 1. It is performed on
demand by setting the OFFSET_CAL2 bit to 1.
Enhanced Offset Calibration
Enhanced offset calibration is a more accurate calibra-
tion method that is needed in the case of the ±200mV
range and 4.5-digit resolution. The MAX1366 performs
enhanced calibration on demand by setting the
OFFSET_CAL2 bit to 1.
Power-Down Modes
The MAX1366/MAX1368 feature independent power-down
the analog input range to have an absolute value of
anywhere between -2.2V and +2.2V.
Thermocouple Measurement
Figure 15 shows a connection from a thermocouple to
the MAX1366/MAX1368. In this application, the
MAX1366/MAX1368 take advantage of the on-chip input
buffers that allow large source impedances on the front
end. The decoupling capacitors reduce noise pickup
from the thermocouple leads. To place the differential
voltage from the thermocouple at a suitable common-
mode voltage, the AIN- input of the MAX1366/MAX1368
is biased to GND. Use an external temperature sensor,
such as the DS75, and a microcontroller to perform cold-
junction temperature compensation.
Transfer Functions
ADC Transfer Functions
Figures 16 –19 show the transfer functions of the
MAX1366/MAX1368. The output data is stored in the
ADC data register in two’s complement.
The transfer function for the MAX1366 with AIN+ - AIN-
≥ 0 and RANGE = GND is:
? V AIN ?
( 1 ) COUNT = 1 . 024 ? AIN +
x 20 , 000 ?
control of the analog and digital LED driver’s circuitry.
Writing a 1 to the PD_DIG and PD_ANA bits in the con-
trol word, powers down the analog and digital circuitry,
? V
? V REF + ? V REF ?
?
?
? V AIN ?
( 2 ) COUNT = 1 . 024 ? AIN +
x 20 , 000 ? + 1
reducing the supply current to 268μA (typ). PD_DIG
powers down the digital filter, while PD_ANA powers
down the analog modulator and ADC input buffers.
Writing a zero to the ENABLE bit in the control word
powers down the LED drivers.
Peak
The MAX1366/MAX1368 feature peak-detection circuitry.
When activated (PEAK bit = 1), the devices display
The transfer function for the MAX1366 with AIN+ - AIN-
< 0 and RANGE = GND is:
? V ?
? V REF + ? V REF ? ?
The transfer function for the MAX1368 with AIN+ - AIN-
≥ 0 and RANGE = GND is:
? V AIN ?
( 3 ) COUNT = 1 . 024 ? AIN +
x 2000 ?
only the highest voltage measured to the LED.
Hold
? V
? V REF + ? V REF ?
?
?
The MAX1366/MAX1368 feature data-hold circuitry.
When activated (HOLD bit = 1), the device holds the
current reading on the LED.
The transfer function for the MAX1368 with AIN+ - AIN-
< 0 and RANGE = GND is:
? V AIN ?
( 4 ) COUNT = 1 . 024 ? AIN +
x 2000 ? + 1
Low Battery
The MAX1366/MAX1368 feature a low-battery detection
? V
? V REF + ? V REF ?
?
?
? V AIN ?
( 5 ) COUNT = 1 . 024 ? AIN +
? V REF + ? V REF ?
x 20 , 000 ? x 10
input. When the voltage at LOWBATT drops below
2.048V (typ), LOWBATT in the status register goes high.
Strain-Gauge Measurement
Connect the differential inputs of the MAX1366/
MAX1368 to the bridge network of the strain gauge. In
Figure 14 , the analog supply voltage powers the bridge
network and the MAX1366/MAX1368, along with the
reference voltage. The MAX1366/MAX1368 handle an
analog input voltage range of ±200mV and ±2V full
scale. The analog/reference inputs of the parts allow
The transfer function for the MAX1366 with AIN+ - AIN-
≥ 0 and RANGE = DV DD is:
? V ?
?
30
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1368ECM+ | 功能描述:LED显示驱动器 Stand-Alone 3.5Digit Panel Meters RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MAX1368ECM+T | 功能描述:LED显示驱动器 Stand-Alone 3.5Digit Panel Meters RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MAX1368ECM-T | 功能描述:LED显示驱动器 RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MAX136C/D | 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 |
| MAX136CJL | 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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