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参数资料
| 型号： | MAX1368ECM+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 31/36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
The transfer function for the MAX1366 with AIN+ - AIN-
< 0 and RANGE = DV DD is:
Figure 23 shows the MAX1366/MAX1368 transfer func-
tion of the output current (4-20OUT) versus the input
? V AIN ?
( 6 ) COUNT = 1 . 024 ? AIN +
x 20 , 000 ? x 10 + 1
? V
? V REF + ? V REF ?
?
?
voltage of the V/I converter.
The transfer function for the MAX1366/MAX1368 with
the current offset enabled (EN_I is high) is:
The transfer function for the MAX1368 with AIN+ - AIN-
≥ 0 and RANGE = DV DD is:
IOUT ?
16mA
1 . 25
x V CONV _ IN + 4 mA
? V AIN ?
( 7 ) COUNT = 1 . 024 ? AIN +
x 2000 ? x 10
? V
? V REF + ? V REF ?
?
?
The transfer function for the MAX1366/MAX1368 with
the current offset disabled (EN_I is low) is:
? V AIN ?
( 8 ) COUNT = 1 . 024 ? AIN +
x 2000 ? x 10 + 1
IOUT ?
x V CONV _ IN
V DACVOUT =
The transfer function for the MAX1368 with AIN+ - AIN-
< 0 and RANGE = DV DD is:
? V ?
? V REF + ? V REF ? ?
DAC Transfer Functions
Figure 20 shows the DAC transfer function for the
MAX1366/MAX1368 in unipolar and bipolar modes.
The transfer function for the DAC in the MAX1366/
MAX1368 unipolar mode is:
Note: The input at V CONV_IN expects a source impe-
dence of typically 6k ? when driving V CONV_IN externally.
N
x V REF
32 , 768 ? 1
where N = two’s complement ADC output code.
In unipolar mode, V DACVOUT is equal to 0V for all two’s
complement ADC codes less than zero (see Figure 21 ).
The transfer function for the DAC in the MAX1366/
MAX1368 in bipolar mode is:
16mA
1 . 25
Supplies, Layout, and Bypassing
Power up AV DD and DV DD before applying an analog
input and external-reference voltage to the device. If
this is not possible, limit the current into these inputs to
50mA. When the analog and digital supplies come from
the same source, isolate the digital supply from the
analog supply with a low-value resistor (10 ? ) or ferrite
bead. For best performance, ground the MAX1366/
MAX1368 to the analog ground plane of the circuit
board. Avoid running digital lines under the device as
this can couple noise onto the IC. Run the analog
ground plane under the MAX1366/MAX1368 to mini-
mize coupling of digital noise. Make the power-supply
lines to the MAX1366/MAX1368 as wide as possible to
provide low-impedance paths and reduce the effects of
glitches on the power-supply line. Shield fast-switching
signals, such as clocks, with digital ground to avoid
radiating noise to other sections of the board. Avoid
running clock signals near the analog inputs. Avoid
crossover of digital and analog signals. Running traces
that are on opposite sides of the board at right angles to
each other reduces feedthrough effects. A microstrip
technique is best, but is not always possible with dou-
ble-sided boards. With this technique, the component
V DACVOUT =
N + 19, 999
6536
x V REF
side of the board is dedicated to ground planes while
signals are placed on the solder side. Good decoupling
is important when using high-resolution ADCs.
I SEG = ?
? x 400
where N = two’s complement ADC output.
Writing into the DAC Independently
A user can independently write to the DAC but cannot
input codes greater than +19,999 or less than -19,999.
In bipolar mode, a -19,999 DAC code provides 4mA
(0mA) output current and a +19,999 DAC code pro-
vides a 20mA (16mA) output current.
Voltage-to-Current Transfer Function
Figures 20 and 21 show the MAX1366/MAX1368 trans-
fer function of the output current (4-20OUT) versus the
ADC output code.
Decouple the supplies with 0.1μF ceramic capacitors to
GND. Place these components as close to the device
as possible to achieve the best decoupling.
Selecting Segment Current
A resistor from ISET to ground sets the current for each
LED segment. See Table 7 for more detail. Use the fol-
lowing formula to set the segment current:
? 1 . 20 V ?
? R ISET ?
______________________________________________________________________________________
31
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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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