参数资料
型号: AS1971-T
厂商: ams
文件页数: 3/19页
文件大小: 0K
描述: IC COMPARATOR SGL O-D SOT23-5
标准包装: 1
类型: 通用
元件数: 1
输出类型: CMOS,开路漏极,满摆幅
电压 - 电源,单路/双路(±): 2.5 V ~ 5.5 V,±1.25 V ~ 2.75 V
电压 - 输入偏移(最小值): 6mV @ 5.5V
电流 - 输入偏压(最小值): 1pA @ 5.5V
电流 - 静态(最大值): 19µA
CMRR, PSRR(标准): 80dB CMRR,80dB PSRR
传输延迟(最大): 400ns
磁滞: ±3mV
工作温度: -40°C ~ 85°C
封装/外壳: SC-74A,SOT-753
安装类型: 表面贴装
包装: 标准包装
其它名称: AS1971-TDKR
www.austriamicrosystems.com
Revision 1.02
10 - 18
AS1970
Data Sheet - Ap p lica tio n In fo r m a tio n
9 Application Information
Figure 17 shows a typical application circuit for the AS1970 - AS1975 comparators.
Figure 17. Typical Application Diagram – Threshold Detector
Hysteresis (AS1970/AS1972/AS1974)
The AS1970/AS1972/AS1974 have 3mV internal hysteresis. Additional hysteresis can be generated with three resis-
tors using positive feedback (Figure 18), however this method also slows hysteresis response time.
Figure 18. Additional Hysteresis AS1970/AS1972/AS1974
Resistor Selection Example
For the circuit shown in Figure 18, the following steps can be used to calculate values for R1, R2, and R3.
1. Select R3 first. The current through R3 should be at least 1A to minimize errors caused by leakage current. The
current through R3 at the trip point is:
(VREF - VOUT)/R3
(EQ 1)
The two possible output states in solving for R3 yields these two formulas:
R3 = VREF/1A
(EQ 2)
R3 = (VREF - VCC)/1A
(EQ 3)
For example, for VREF = 1.2V and VCC = 5V, the two R3 resistor values are 1.2M
Ω and 3.8MΩ. Use the smaller of
the two resulting resistor values; in this case a standard 1.2M
Ω resistor should be used for R3.
2. Choose the hysteresis band (VHB). For this example, use VHB = 50mV.
3. Calculate R1 according to the following equation:
R1 = R3(VHB/VCC)(EQ 4)
Substituting the example values for R3 and VHB gives:
R1 = 1.2M
Ω(50mV/5V) = 12kΩ
AS1970 - AS1975
RPULLUP
AS1971/AS1973/AS1975 only
VIN
4
IN-
1
OUT
2
VCC
5
VEE
3
IN+
OUT
R1
R3
VCC
VIN
VREF
R2
+
VEE
VCC
ams
AG
Technical
content
still
valid
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