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参数资料
| 型号： | MAX1365ECM+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/25页 |
| 文件大小： | 0K |
| 描述： | IC PANEL METER 4.5 DIG 48LQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 显示器类型： | LED |
| 配置： | 7 段显示 |
| 数字或字符： | A/D，4.5 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： | 带卷 (TR) |
Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 4–20mA Output
signal into a digital pulse train whose average duty
cycle represents the digitized signal information. The
modulator quantizes the input signal at a much higher
sample rate than the bandwidth of the input. The
MAX1365/MAX1367 modulator provides 3rd-order fre-
quency shaping of the quantization noise resulting from
the single-bit quantizer. The modulator is fully differen-
tial for maximum signal-to-noise ratio and minimum sus-
ceptibility to power-supply noise. A single-bit data
stream is then presented to the digital filter to remove
the frequency-shaped quantization noise.
Digital Filtering
The MAX1365/MAX1367 contain an on-chip digital low-
0
-40
-80
-120
-160
-200
pass filter that processes the data stream from the
0
10
20
30
40
50
60
modulator using a SINC 4 response:
FREQUENCY (Hz)
? sin( x ) ?
?
x ?
? ?
4
Figure 1. Frequency Response of the SINC 4 Filter (Notch at 60Hz)
step changes at the input, allow a settling time of
The SINC 4 filter has a settling time of four output data
periods (4 x 200ms). The MAX1365/MAX1367 have
25% overrange capability built into the modulator and
digital filter. The digital filter is optimized for the f CLK
equal to 4.9152MHz. The frequency response of the
SINC 4 filter is calculated as follows:
800ms before valid data is read.
Internal Clock
The MAX1365/MAX1367 contain an internal oscillator.
Using the internal oscillator saves board space by
removing the need for an external clock source. The
oscillator is optimized to give 50Hz and 60Hz power-
? 1 ( 1 ? Z ? N ) ?
? N ( 1 ? Z ? 1 ) ?
H ( z ) = ? ?
? ?
4
supply and common-mode rejection.
Charge Pump
The MAX1365/MAX1367 contain an internal charge pump
f m ? ? ?
? sin ? N π ?
? sin π f
N ? ? ? ?
? f ? ?
H ( f ) =
? ? f ? ?
?
? ? m ? ?
1 ? ?
?
4
to provide the negative supply voltage for the internal
analog input/reference buffers. The bipolar input range of
the analog input/reference buffers allows this device to
accept negative inputs with high source impedances.
Connect a 0.1μF capacitor from NEGV to GND.
LED Driver (Table 1)
where N is the oversampling ratio, and f m = N x output
data rate = 5Hz.
Filter Characteristics
Figure 1 shows the filter frequency response. The
SINC 4 characteristic -3dB cutoff frequency is 0.228
times the first notch frequency (5Hz). The oversampling
ratio (OSR) for the MAX1367 is 128 and the OSR for the
MAX1365 is 1024. The output data rate for the digital fil-
ter corresponds to the positioning of the first notch of
the filter ’s frequency response. The notches of the
SINC 4 filter are repeated at multiples of the first notch
frequency. The SINC 4 filter provides an attenuation of
better than 100dB at these notches. For example, 50Hz
is equal to 10 times the first notch frequency and 60Hz
is equal to 12 times the first notch frequency. For large
The MAX1365 has a 4.5-digit common-cathode display
driver, and the MAX1367 has a 3.5-digit common-cath-
ode display driver. In addition, the LED drivers of the
MAX1365/MAX1367 feature peak-detection and data-
hold circuitry.
Figures 2 and 3 show the connection schemes for a
standard seven-segment LED display. The LED update
rate is 2.5Hz. Figure 4 shows a typical common-cath-
ode configuration for two digits. In common-cathode
configuration, the cathodes of all LEDs in a digit are
connected together. Each segment driver of the
MAX1365/MAX1367 connects to its corresponding
LED’s anodes. For example, segment driver SEGA con-
nects to all LED segments designated as A. Similar
configurations are used for other segment drivers.
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1366ECM | 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 |
| MAX1366ECM+ | 功能描述:LED显示驱动器 Stand-Alone 4.5Digit 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 |
| MAX1366ECM+T | 功能描述:LED显示驱动器 Stand-Alone 4.5Digit 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 |
| MAX1366ECM-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 |
| MAX1366EVKIT | 功能描述:LED 照明开发工具 MAX1366 EVAL KIT RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
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