参数资料
型号: MCP6V28T-E/MS
厂商: Microchip Technology
文件页数: 22/50页
文件大小: 0K
描述: IC OPAMP AUTO-ZERO SGL 8SOIC
标准包装: 2,500
放大器类型: 自动调零
电路数: 1
输出类型: 满摆幅
转换速率: 1 V/µs
增益带宽积: 2MHz
电流 - 输入偏压: 7pA
电压 - 输入偏移: 2µV
电流 - 电源: 620µA
电流 - 输出 / 通道: 22mA
电压 - 电源,单路/双路(±): 2.3 V ~ 5.5 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
供应商设备封装: 8-MSOP
包装: 带卷 (TR)
2011 Microchip Technology Inc.
DS25007B-page 29
MCP6V26/7/8
The MCP9700A senses the temperature at its physical
location. It needs to be at the same temperature as the
cold junction (TCJ), and produces V3 (Figure 4-15).
The MCP1541 produces a 4.10V output, assuming
VDD is at 5.0V. This voltage, tied to a resistor ladder of
4.100(RTH) and 1.3224(RTH), would produce a
Thevenin equivalent of 1.00V and 250(RTH). The
1.3224(RTH) resistor is combined in parallel with the
top right RTH resistor (in Figure 4-15), producing the
0.5696(RTH) resistor.
V4 should be converted to digital, then corrected for the
thermocouple’s non-linearity. The ADC can use the
MCP1541 as its voltage reference. Alternately, an
absolute reference inside a PICmicro device can be
used instead of the MCP1541.
4.4.4
OFFSET VOLTAGE CORRECTION
Figure 4-17 shows an MCP6V27 correcting the input
offset voltage of another op amp. R2 and C2 integrate
the offset error seen at the other op amp’s input; the
integration needs to be slow enough to be stable (with
the feedback provided by R1 and R3).
FIGURE 4-17:
Offset Correction.
4.4.5
PRECISION COMPARATOR
Use high gain before a comparator to improve the
latter’s performance. Do not use MCP6V26/7/8 as a
comparator by itself; the VOS correction circuitry does
not operate properly without a feedback loop.
FIGURE 4-18:
Precision Comparator.
C2
R2
R1
R3
U2
VDD/2
VIN
VOUT
R2
U1
MCP6V26
R4
R5
VDD/2
MCP661
VIN
R3
R2
VDD/2
U2
VOUT
R5
R4
R1
1k
Ω
U1
MCP6V26
MCP6541
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