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| 型号： | TC1026CEPA |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDIP8 |
| 封装： | PLASTIC, DIP-8 |
| 文件页数： | 8/13页 |
| 文件大小： | 84K |
| 代理商： | TC1026CEPA |
TC1026
Linear Building Block – Low-Power
Comparator with Op Amp and
Voltage Reference
4
TC1026-2 1/04/01
2001 Microchip Technology Inc. DS21337A
DETAILED DESCRIPTION
The TC1026 is one of a series of very low-power, linear
building block products targeted at low-voltage, single-
supply applications. The TC1026 minimum operating volt-
age is 1.8V, and typical supply current is only 12
A. It
combines a comparator, an op amp, and a voltage reference
in a single package.
Comparator
The TC1026 contains one comparator. The comparator’s
input range extends beyond both supply voltages by 200mV
and the outputs will swing to within several millivolts of the
supplies depending on the load current being driven. The
inverting input is internally connected to the output of the
reference.
The comparator exhibits propagation delay and supply
current which are largely independent of supply voltage. The
low input bias current and offset voltage make it suitable for
high impedance precision applications.
Operational Amplifier
The TC1026 contains one rail-to-rail op amp. The
amplifier’s input range extends beyond both supplies by
200mV and the outputs will swing to within several millivolts
of the supplies depending on the load current being driven.
The amplifier design is such that large signal gain, slew
rate and bandwidth are largely independent of supply volt-
age. The low input bias current and offset voltage of the
TC1026 make it suitable for precision applications.
Voltage Reference
A 2.0 percent tolerance, internally biased, 1.20V bandgap
voltage reference is included in the TC1026. It has a push-
pull output capable of sourcing and sinking at least 50
A.
TYPICAL APPLICATIONS
The TC1026 lends itself to a wide variety of applications,
particularly in battery-powered systems. It typically finds
application in power management, processor supervisory,
and interface circuitry.
External Hysteresis (Comparator)
Hysteresis can be set externally with three resistors
using positive feedback techniques (see Figure 1).
The
design procedure for setting external comparator hysteresis
is as follows:
1.
Choose the feedback resistor RC. Since the input
bias current of the comparator is at most 100 pA, the current
through RC can be set to 100 nA (i.e. 1000 times the input
bias current) and retain excellent accuracy. The current
through RC at the comparator’s trip point is VR / RC where VR
is a stable reference voltage.
2.
Determine the hysteresis voltage (VHY) between
the upper and lower thresholds.
3.
Calculate RA as follows.
RA = RC
(
VHY
VDD )
4.
Choose the rising threshold voltage for VSRC (VTHR).
5.
Calculate RB as follows:
1
RB = [ ( VTHR – 1 – 1 ]
(VR * RA))
RA
RC
6. Verify the threshold voltages with these formulas:
VSRC rising:
VTHR =
(VR) (RA)
[(
1
RA )
+
(
RB )
+
(
RC ) ]
VSRC falling:
VTHF = VTHR –
[ (RA * VDD)
RC
]
Equation 1.
Equation 2.
Equation 3.
Equation 4.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1026CEUA | 功能描述:校验器 IC Low Pwr w/OpAmp & VR RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| TC1026CEUATR | 功能描述:校验器 IC Low Pwr w/OpAmp & VR RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| TC1026COA | 制造商:TELCOM 制造商全称:TelCom Semiconductor, Inc 功能描述:LINEAR BUILDING BLOCK - LOW POWER COMPARATOR WITH OP AMP AND VOLTAGE REFERENCE |
| TC1026CPA | 制造商:TELCOM 制造商全称:TelCom Semiconductor, Inc 功能描述:LINEAR BUILDING BLOCK - LOW POWER COMPARATOR WITH OP AMP AND VOLTAGE REFERENCE |
| TC1026CUA | 制造商:TELCOM 制造商全称:TelCom Semiconductor, Inc 功能描述:LINEAR BUILDING BLOCK - LOW POWER COMPARATOR WITH OP AMP AND VOLTAGE REFERENCE |
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