參數(shù)資料
型號(hào): AS1977-T
廠商: ams
文件頁數(shù): 6/18頁
文件大?。?/td> 0K
描述: IC COMPARATOR OPEN SOT23-5
標(biāo)準(zhǔn)包裝: 1
類型: 通用
元件數(shù): 1
輸出類型: CMOS,開路漏極,滿擺幅
電壓 - 電源,單路/雙路(±): 1.8 V ~ 5.5 V
電壓 - 輸入偏移(最小值): 5mV @ 5V
電流 - 輸入偏壓(最小值): 0.001µA @ 5V
電流 - 輸出(標(biāo)準(zhǔn)): 50mA
電流 - 靜態(tài)(最大值): 500nA
CMRR, PSRR(標(biāo)準(zhǔn)): 74dB CMRR,86.02dB PSRR
傳輸延遲(最大): 18ns
磁滯: 3mV
工作溫度: -40°C ~ 85°C
封裝/外殼: SC-74A,SOT-753
安裝類型: 表面貼裝
包裝: 標(biāo)準(zhǔn)包裝
其它名稱: AS1977-TDKR
www.austriamicrosystems.com
Revision 1.01
13 - 17
AS1976/AS1977
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
Additional Hysteresis (AS1977)
Additional hysteresis can be added to the AS1977 and AS1979 with 4 resistors and positive feedback (see Figure 28).
Figure 28. AS1977 Additional Hysteresis
Resistor Selection Example
For the circuit shown in Figure 28, use the following steps to calculate values for R1, R2, R3, and R4.
1. Select R3 according to one of these formulas:
R3 = VREF/1A
(EQ 9)
R3 = (VCC - VREF)/1A - R4
(EQ 10)
Use the smaller of the two resulting resistor values for R3.
2. Choose the hysteresis band required (VHB).
3. Calculate R1 as:
R1 = (R3 + R4)(VHB/VCC)
(EQ 11)
4. Choose the trip point for VIN rising (VTHR).
5. Calculate R2 as:
R2 = 1/[VTHR/(VREF x R1) - (1/R1) - 1/R3](EQ 12)
6. Verify the trip voltages and hysteresis as:
VIN rising: VTHR = VREF[R1(1/R1 + 1/R2 + 1/R3)]
(EQ 13)
VIN falling: VTHF = VREF[R1(1/R1 + 1/R2 + 1/(R3+R4))] - [1/(R3+R4)]VCC
(EQ 14)
Hysteresis = VTHR - VTHF
(EQ 15)
Zero-Crossing Detector
Figure 29 shows the AS1976 in a zero-crossing detector circuit. The inverting input (IN-) is connected to ground, and
the non-inverting input (IN+) is connected to a 100mVp-p signal source. When the signal at IN- crosses 0V, the signal
at OUT changes states.
Figure 29. Zero Crossing Detector
+
R3
VEE
VCC
VCC
R2
R4
R1
VREF
VIN
OUT
+
100mVp-p
+
AS1976
5
VCC
3
IN+
1
OUT
2
VEE
4
IN-
ams
AG
Technical
content
still
valid
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