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参数资料
| 型号： | MAX1367ECM+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 19/25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 |
| 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 |
Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 4–20mA Output
? V AIN ?
( 7 ) COUNT = 1 . 024 ? AIN +
? V REF + ? V REF ?
x 2000 ? x 10
The transfer function for the MAX1367 with AIN+ - AIN-
≥ 0 and RANGE = DV DD is:
? V ?
?
The transfer function for the MAX1367 with AIN+ - AIN-
< 0 and RANGE = DV DD is:
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 MAX1365/
? V AIN ?
( 8 ) COUNT = 1 . 024 ? AIN +
x 2000 ? x 10 + 1
? V
? V REF + ? V REF ?
?
?
MAX1367 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
DAC Transfer Functions
Figure 11 shows the DAC transfer function for the
MAX1365/MAX1367 in unipolar and bipolar modes.
The transfer function for the DAC in the MAX1365/
MAX1367 unipolar mode is:
ground plane under the MAX1365/MAX1367 to mini-
mize coupling of digital noise. Make the power-supply
lines to the MAX1365/MAX1367 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
V DACVOUT =
N
32 , 768 ? 1
x V REF
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
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 12).
The transfer function for the DAC in the MAX1365/
MAX1367 in bipolar mode is:
each other reduces feedthrough effects. Good decou-
pling is important when using high-resolution ADCs.
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.
V DACVOUT =
N + 19, 999
65 , 536
x V REF
Selecting Segment Current
A resistor from ISET to ground sets the current for each
LED segment. See Table 6 for more detail. Use the fol-
I SEG = ?
? x 450
where N = two’s complement ADC output.
Voltage-to-Current Transfer Function
Figures 12 and 13 show the MAX1365/MAX1367 trans-
fer function of the output current (4-20OUT) versus the
ADC input code.
The transfer function for the MAX1365/MAX1367 with
the current offset enabled (EN_I is high) is:
lowing formula to set the segment current:
? 1 . 20 V ?
? R ISET ?
R ISET values below 25k ? increase the I SEG . However,
the internal current-limit circuit limits the I SEG to less than
30mA. At higher I SEG values, proper operation of the
device is not guaranteed. In addition, the power dissipat-
IOUT ?
16mA
1 . 25
x V CONV _ IN + 4 mA
ed may exceed the package power-dissipation limit.
Choosing Supply Voltage to Minimize
Power Dissipation
The transfer function for the MAX1365/MAX1367 with
the current offset disabled (EN_I is low) is:
The MAX1365/MAX1367 drive a peak current of 25.5mA
into LEDs with a 2.2V forward voltage drop when operat-
ed from a supply voltage of at least 3.0V. Therefore, the
IOUT ?
16mA
1 . 25
x V CONV _ IN
minimum voltage drop across the internal LED drivers is
0.8V (3.0V - 2.2V = 0.8V). The MAX1365/MAX1367 sink
when the outputs are operating and the LED segment
Note: The input at V CONV_IN expects a source imped-
ance of typically 6k ? when driving V CONV_IN externally.
drivers are at full current (8 x 25.5mA = 204mA). For a
3.3V supply, the MAX1365/MAX1367 dissipate 224.4mW
((3.3V - 2.2V) x 204 = 224.4mW). If a higher supply volt-
age is used, the driver absorbs a higher voltage, and the
driver ’s power dissipation increases accordingly.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1367ECM+ | 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 |
| MAX1367ECM+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 |
| MAX1367ECM-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 |
| MAX1368ECM | 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 |
| 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 |
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