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参数资料
| 型号： | MAX1368ECM+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 29/36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
LED Data Register (Read/Write)
MSB
LSB
(MAX1368)
LSB
(MAX1366)
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default values: B1E0h
The peak data register is a 16-bit read-only register.
Set the PEAK bit to 1 to enable the PEAK function. This
register stores the peak value of the ADC conversion
result. First, the current ADC result is saved to the
PEAK register, then the new ADC conversion result is
compared to this value. If the new value is larger than
the value in the peak register, the MAX1366/MAX1368
save the new value to the peak register. If the new
DAC Operation
For the MAX1366/MAX1368, a voltage proportional to
the ADC input is available at DACVOUT. Connect
DACVOUT to CONV_IN for normal operation. (See
Figure 20 for DAC transfer function).
In normal operation, pull DACDATA_SEL low to use the
ADC output as the DAC input. Pull DACDATA_SEL high
to allow data to be written to the DAC register using the
SPI/QSPI/MICROWIRE interface. Once DACDATA_SEL
is pulled high, the three digital inputs ( CS_DAC , DIN,
and SCLK) load the digital input data serially into the
DAC. (See Figure 11 .)
To clock data into the DAC shift register, drive CS_DAC
low. SCLK synchronizes the data transfer. Immediately,
following CS_DAC high-to-low transition, the data shifts
synchronously into the serial shift register on the rising
edge of the serial clock input (SCLK). After 16 data bits
have been loaded into the serial input register, the data
latches to the DAC register on the rising edge of
CS_DAC . The DAC output updates on the next conver-
sion clock (2.5Hz). DIN is transferred MSB first.
Reference
ADC Reference
The MAX1366/MAX1368 reference sets the full-scale
range of the ADC transfer function. With a nominal
2.048V reference, the ADC full-scale range is ±2V with
RANGE = GND. With RANGE = DV DD, the full-scale
range is ±200mV. A decreased reference voltage
decreases full-scale range (see the Transfer Functions
section).
The MAX1366/MAX1368 accept either an external ref-
erence or an internal reference (INTREF). The INTREF
logic selects the reference mode (see the Control
value is less than the value in the peak register, the
value in the peak register remains unchanged. Set the
PEAK bit to zero to clear the value in the PEAK register.
The data is represented in two’s-complement format.
For the MAX1366, the data is 16-bit and D15 is the
MSB. For the MAX1368, the data is 12-bit, D15 is the
MSB, and D4 is the LSB followed by 4 trailing sub-bits.
Register (Read/Write) section). The default power-on
state sets the MAX1366/MAX1368 to use the external
reference with the INTREF bit cleared to zero.
For internal-reference operation, set the INTREF bit to
one , connect REF- to GND, and bypass REF+ to GND
with a 4.7μF capacitor. The internal reference provides
a nominal 2.048V source between REF+ and GND. The
internal-reference temperature coefficient is typically
40ppm/°C.
For external-reference operation, set INTREF to GND.
REF+ and REF- are fully differential. For a valid external-
reference input, V REF+ must be greater than V REF- .
Bypass REF+ and REF- with a 0.1μF or greater capaci-
tor to GND in external-reference mode.
Figure 14 shows the MAX1366/MAX1368 operating
with an external single-ended differential reference. In
this figure, REF- is connected to the top of the strain
gauge and REF+ is connected to the midpoint of the
resistor-divider of the supply.
Figure 15 shows the MAX1366/MAX1368 operating with
an external single-ended reference. In this figure, REF-
is connected to GND and REF+ is driven with an exter-
nal 2.048V reference. Bypass REF+ to GND with a
0.1μF capacitor.
DAC Reference
The DAC of the MAX1366/MAX1368 accepts either an
external reference or an internal reference. For external-
reference operation, disable the DAC reference buffer by
setting REFSELE to DV DD and connect a voltage source
to REF_DAC.
For internal-reference operation, enable the DAC refer-
ence buffer by setting REFSELE to GND. In this mode,
leave REFDAC floating.
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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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