MCP1525-41精密电压参考源数据手册
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"MCP1525-41是一款由Microchip Technology Inc.生产的精密电压基准芯片，适用于各种需要高精度电压参考的应用。这款芯片提供2.5V和4.096V两种输出电压，初始精度高达±1%（最大值），温度漂移为±50ppm/°C（最大值）。它能在-40°C到+85°C的工业温度范围内稳定工作，并有TO-92和SOT-23-3两种封装形式。MCP1525-41适合电池供电系统、手持设备、仪器仪表、过程控制、测试设备、数据采集系统、通信设备、医疗设备以及精密电源等应用场景。此外，它常与8位、10位和12位的模数转换器(ADCs)和数模转换器(DACs)配合使用。典型应用电路包括一个精密的电压参考设计，结合了先进的CMOS电路设计和EPROM校准，以实现高精度和时间稳定性。"
MCP1525-41的主要特性：
1. **精密电压参考**：MCP1525-41提供了两种不同的输出电压选项，2.5V和4.096V，这些电压参考在设计中具有高精度。
2. **初始精度**：芯片的最大初始误差仅为±1%，这使得它成为对精度要求高的应用的理想选择。
3. **温度漂移**：温度漂移低至±50ppm/°C，确保了在不同温度环境下的稳定性能。
4. **输出电流驱动**：能提供±2mA的输出电流驱动能力，满足大多数电路的需求。
5. **最大输入电流**：在+25°C时，最大输入电流限制为100µA，降低了功耗。
6. **工作温度范围**：-40°C到+85°C的宽泛工作温度范围，使其能在多种环境条件下可靠工作。
7. **封装选项**：提供TO-92和SOT-23-3两种小型封装，便于在空间有限的设计中使用。
8. **应用广泛**：涵盖了电池供电系统、手持设备、仪器仪表等多个领域，以及各种类型的转换器应用。
MCP1525-41的设计特点：
- **先进的CMOS电路设计**：利用先进的互补金属氧化物半导体技术，实现了低功耗和高效率。
- **EPROM修剪**：通过EPROM进行微调，可以补偿制造过程中的偏差，提高整体精度。
- **低静态电流**：在25°C时，静态电流仅为100µA（最大值），有助于延长电池寿命。
在实际应用中，MCP1525-41通常被用作ADC和DAC的参考电压源，以确保数据转换的准确性和一致性。这种高精度的电压基准对于需要精确测量和控制的系统至关重要，例如在数据采集系统、通信设备和医疗设备中。通过优化的电路设计和温度补偿，MCP1525-41能够提供长期的稳定性和可靠性，是许多高性能电子系统中的关键组件。
MCP1525/41
DS21653C-page 4 2001-2012 Microchip Technology Inc.
1.1.4 DROPOUT VOLTAGE
The dropout voltage of these devices is measured by
reducing V
IN
to the point where the output drops by 1%.
Under these conditions the dropout voltage is equal to:
EQUATION 1-2:
The dropout voltage is affected by ambient
temperature and load current.
In Figure 2-18, the dropout voltage is shown over a
negative and positive range of output current. For
currents above zero milliamps, the dropout voltage is
positive. In this case, the voltage reference is primarily
powered by V
IN
. With output currents below zero
milliamps, the dropout voltage is negative. As the
output current becomes more negative, the input
current (I
IN
) reduces. Under this condition, the output
current begins to provide the needed power to the
voltage reference.
1.1.5 LINE REGULATION
Line regulation is a measure of the change in output
voltage (V
OUT
) as a function of a change in the input
voltage (V
IN
). This is expressed as V
OUT
/V
IN
and is
measured in either µV/V or ppm. For example, a 1 µV
change in V
OUT
caused by a 500 mV change in V
IN
would net a V
OUT
/V
IN
of 2 µV/V, or 2 ppm.
1.1.6 LOAD REGULATION (V
OUT
/I
OUT
)
Load regulation is a measure of the change in the
output voltage (V
OUT
) as a function of the change in
output current (I
OUT
). Load regulation is usually
measured in mV/mA.
1.1.7 INPUT CURRENT
The input current (operating current) is the current that
sinks from V
IN
to V
SS
without a load current on the out-
put pin. This current is affected by temperature and the
output current.
1.1.8 INPUT VOLTAGE REJECTION
RATIO
The Input Voltage Rejection Ratio (IVRR) is a measure
of the change in output voltage versus the change in
input voltage over frequency, as shown in Figure 2-7.
The calculation used for this plot is:
EQUATION 1-3:
1.1.9 LONG-TERM OUTPUT STABILITY
The long-term output stability is measured by exposing
the devices to an ambient temperature of 125°C
(Figure 2-9) while configured in the circuit shown in
Figure 1-1. In this test, all electrical specifications of the
devices are measured periodically at +25°C.
FIGURE 1-1: Dynamic Life Test
Configuration.
1.1.10 OUTPUT VOLTAGE HYSTERESIS
The output voltage hysteresis is a measure of the
output voltage error once the powered devices are
cycled over the entire operating temperature range.
The amount of hysteresis can be quantified by
measuring the change in the +25°C output voltage after
temperature excursions from +25°C to +85°C to +25°C
and also from +25°C to -40°C to +25°C.
V
DROP
V
IN
V
OUT
–=
IVRR 20
V
IN
V
OUT
--------- ----
log dB=
V
SS
V
OUT
V
IN
C
L
V
IN
=5.5V
R
L
±2 mA
square wave
@10Hz
MCP1525
MCP1541
1µF
21653C.book Page 4 Thursday, January 10, 2013 12:55 PM
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