参数资料
型号: AS1972
厂商: ams
文件页数: 5/19页
文件大小: 0K
描述: IC COMPARATOR DUAL 8-MSOP
标准包装: 50
类型: 通用
元件数: 2
输出类型: CMOS,推挽式,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): 32µA
CMRR, PSRR(标准): 80dB CMRR,80dB PSRR
传输延迟(最大): 420ns
磁滞: ±3mV
工作温度: -40°C ~ 85°C
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
安装类型: 表面贴装
包装: 管件
产品目录页面: 804 (CN2011-ZH PDF)
www.austriamicrosystems.com
Revision 1.02
12 - 18
AS1970
Data Sheet - Ap p lica tio n In fo r m a tio n
Hysteresis Band
Internal hysteresis creates two trip points (shown in Figure 20): rising input voltage (VTHR) and falling input voltage
(VTHF). The area between the trip points is the hysteresis band (VHB). When the comparator input voltages are equiva-
lent, the hysteresis effectively causes one comparator input to move quickly past the other, thus taking the input out of
the region where oscillation occurs.
In Figure 20 REF has a fixed voltage applied and IN+ is varied. If the inputs are reversed the output will be inverted.
Figure 20. Threshold Hysteresis Band
Zero-Crossing Detector
Figure 21 shows the AS1970 in a zero-crossing detector circuit. The inverting input is connected to ground, and the
non-inverting input is connected to a 100mVp-p signal source. As the signal at the non-inverting input crosses 0V, the
signal at OUT changes states.
Figure 21. Zero-Crossing Detector
Logic Level Translator
The comparators can be used as a 5V/3V logic translator as shown in Figure 22. The circuit in Figure 22 converts 5V-
to 3V-logic levels, and provides the full 5V logic-swing without creating overvoltage on the 3V logic inputs. When the
comparator is powered by a 5V supply, RPULLUP for the open-drain output should be connected to the +3V supply volt-
age.
For 3V-to-5V logic-level translations, connect the +3V supply voltage to VCC and the +5V supply voltage to RPULLUP.
Figure 22. Logic Level Translator
IN+
OUT
VTHR
VTHF
REF
Thresholds
Hysteresis
Band
VHB
5
VEE
1
OUT
100mVp-p
AS1970
4
IN-
3
IN+
2
VCC
+
+
AS1971
RPullup
+5/+3V
Logic Out
+3/+5V
+5/+3V
Logic In
100k
Ω
100k
Ω
+3/+5V
4
IN-
5
VEE
3
IN+
1
OUT
2
VCC
+
+
ams
AG
Technical
content
still
valid
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