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参数资料
| 型号： | MAX1368ECM+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/36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： | 2,000 |
| 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： | 带卷 (TR) |
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Microcontroller-Interface, 4.5-/3.5-Digit Panel
Meters with 4–20mA Output
Internal Analog Input/Reference Buffers
The MAX1366/MAX1368 analog input/reference buffers
allow the use of high-impedance signal sources. The
input buffers’ common-mode input range allows the ana-
log inputs and the reference to range from -2.2V to +2.2V.
Modulator
The MAX1366/MAX1368 perform analog-to-digital con-
versions using a single-bit, 3rd-order, sigma-delta mod-
ulator. The sigma-delta modulator converts the input
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
0
-40
-80
-120
-160
-200
MAX1366/MAX1368 modulator provides 3rd-order fre-
0
10
20
30
40
50
60
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 MAX1366/MAX1368 contain an on-chip digital low-
pass filter that processes the data stream from the
modulator using a SINC 4 response:
FREQUENCY (Hz)
Figure 1. Frequency Response of the SINC 4 Filter (Notch at 60Hz)
ratio (OSR) for the MAX1368 is 128 and the OSR for the
MAX1366 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
? sin( x ) ?
?
x ?
? ?
4
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
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 MAX1366/MAX1368 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.
Clock Modes
Configure the MAX1366/MAX1368 to use either the
internal oscillator or an externally applied clock to drive
the modulator, filter, and DAC. Set the EXTCLK bit in
the control register to zero to put the device in internal
? 1 ( 1 ? Z ? N ) ?
? N ( 1 ? Z ? 1 ) ?
f m ? ? ?
? sin ? N π ?
H ( f ) =
? sin ? π f ? ?
? ?
? f ? ?
H ( z ) = ? ?
? ?
? ? f ? ?
N ? ?
1 ? ?
4
? m ? ?
4
clock mode. Set the EXTCLK bit to one to put the
device in external clock mode. When using the internal
oscillator, connect CLK to GND or DV DD . The
MAX1366/MAX1368 operate with a 4.9152MHz clock to
achieve maximum rejection of 50Hz/60Hz common-
mode, power-supply, and normal-mode noise.
Internal Clock Mode
The MAX1366/MAX1368 contain an internal oscillator.
The power-up condition for the MAX1366/MAX1368 is
internal clock operation with the EXTCLK bit in the con-
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
trol register equal to zero. Using the internal oscillator
saves board space by removing the need for an exter-
nal clock source.
External-Clock Mode
For external clock operation, set the EXTCLK bit in the
control register to one and drive CLK with a 4.9152MHz
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX136CMH | 制造商:Maxim Integrated Products 功能描述:44 PINS MQFP PKG - Bulk 制造商:Rochester Electronics LLC 功能描述: |
| MAX136CMH+ | 制造商:Maxim Integrated Products 功能描述:ADC SGL DUAL SLOPE 3 1/2DIGIT LCD 44MQFP - Rail/Tube |
| MAX136CMH+D | 功能描述:模数转换器 - ADC Low-Pwr 3 1/2 Digit ADC 2.5sps 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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