參數(shù)資料
型號: AS1977-T
廠商: ams
文件頁數(shù): 4/18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
11 - 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
9 Application Information
The AS1976/AS1977 comparators are perfect for use with all 2-cell battery-powered applications. Figure 25 shows a
typical application for the AS1977.
Figure 25. AS1977 Typical Application Circuit
Internal Hysteresis
The comparators were designed with 3mV of internal hysteresis to neutralize the effects of parasitic feedback, i.e., to
prevent unwanted rapid changes between the two output states.
The internal hysteresis in the AS1976/AS1977 creates two trip points:
!
Rising Input Voltage (VTHR) – The comparator switches its output from low to high as VIN rises above this trip point.
!
Falling Input Voltage (VTHF) – The comparator switches its output from high to low as VIN falls below this trip point.
The area between the trip points is the hysteresis band (VHB) (see Figure 26). When the AS1976/AS1977 input volt-
ages are equivalent, the hysteresis effectively causes one input to move quickly past the other, thus taking the input
out of the region where oscillation occurs. In Figure 26 IN- has a fixed voltage applied and IN+ is varied.
Note:
If the inputs are reversed the output will be inverted.
Figure 26. Threshold Hysteresis Band
AS1977
RPULLUP
VIN
4
IN-
1
OUT
5
VCC
2
VEE
3
IN+
OUT
VTHR
VTHF
IN-
Thresholds
Hysteresis
Band
VHB
ams
AG
Technical
content
still
valid
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