- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄10675 > AS1975-T (ams)IC COMPARATOR QUAD O-D 14-TSSOP PDF資料下載
參數(shù)資料
| 型號(hào)： | AS1975-T |
| 廠商： | ams |
| 文件頁數(shù)： | 4/19頁 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR QUAD O-D 14-TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 通用 |
| 元件數(shù)： | 4 |
| 輸出類型： | CMOS，開路漏極，滿擺幅 |
| 電壓 - 電源，單路/雙路(±)： | 2.5 V ~ 5.5 V，±1.25 V ~ 2.75 V |
| 電壓 - 輸入偏移（最小值）： | 6mV @ 5.5V |
| 電流 - 輸入偏壓（最小值）： | 1pA @ 5.5V |
| 電流 - 靜態(tài)（最大值）： | 64µA |
| CMRR, PSRR（標(biāo)準(zhǔn)）： | 80dB CMRR，80dB PSRR |
| 傳輸延遲（最大）： | 400ns |
| 磁滯： | ±3mV |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 安裝類型： | 表面貼裝 |
| 包裝： | 帶卷 (TR) |
www.austriamicrosystems.com
Revision 1.02
11 - 18
AS1970
Data Sheet - Ap p lica tio n In fo r m a tio n
4. Choose the trip point for VIN rising (VTHR) (see page 12). This is the threshold voltage at which the AS1970 -
AS1975 switches its output from low to high as VIN rises above the trip point. For this example, choose VTHR = 3V.
5. Calculate R2 as:
R2 = 1/[VTHR/(VREF x R1) - (1/R1) - (1/R3)]
(EQ 5)
Substituting the example values gives:
R2 = 1/[3.0V/(1.2V x 12k
Ω) - (1/12kΩ) - (1/1.2MΩ)] = 8.05kΩ
In this example, a standard 8.2k
Ω resistor should be used for R2.
6. Verify the trip voltages and hysteresis as:
VTHR = VREF x R1[(1/R1) + (1/R2) + (1/R3)]
(EQ 6)
VTHF = VTHR - (R1 x VCC/R3)(EQ 7)
Hysteresis = VTHR - VTHF
(EQ 8)
Hysteresis (AS1971/AS1973/AS1975)
The AS1971/AS1973/AS1975 have 3mV internal hysteresis. Their open-drain outputs require an external pullup resis-
tor (Figure 19), and additional hysteresis can be generated using positive feedback.
Figure 19. Additional Hysteresis AS1971/AS1973/AS1975
Resistor Selection Example
For the circuit shown in Figure 19, the following steps can be used to calculate values for R1, R2, R3, and R4:
1. Select R3 according to one of:
R3 = VREF/500A
(EQ 9)
R3 = (VREF - VCC)/500A - R4
(EQ 10)
Use the smaller of the two resulting resistor values.
2. Choose the hysteresis band required (VHB). For this example, use 50mV.
3. Calculate R1 as:
R1 = (R3 + R4)(VHB/VCC)(EQ 11)
4. Choose the trip point for VIN rising (VTHR) (see page 12). This is the threshold voltage at which the comparator
switches its output from low to high as VIN rises above the trip point.
5. Calculate R2 as:
R2 = 1/[VTHR /(VREF x R1) - (1/R1) - 1/(R3 + R4)]
(EQ 12)
6. Verify the trip voltages and hysteresis as follows:
VIN rising: VTHR = VREF x R1 x [1/R1 + 1/R2 + 1/(R3 + R4)]
(EQ 13)
VIN falling: VTHF = VREF x R1 x [1/R1 + 1/R2 + 1/(R3+R4)] - 1/(R3+R4) x VCC
(EQ 14)
Hysteresis = VTHR - VTHF
(EQ 15)
+
R3
VEE
VCC
–
VCC
R2
R4
R1
VREF
VIN
OUT
ams
AG
Technical
content
still
valid
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VI-JWK-MY-F1 | CONVERTER MOD DC/DC 40V 50W |
| VI-B1W-MX-F3 | CONVERTER MOD DC/DC 5.5V 75W |
| LTC2410CGN#PBF | IC ADC 24BIT DIFF INP/REF 16SSOP |
| VI-JWH-MY-F4 | CONVERTER MOD DC/DC 52V 50W |
| AS1974-T | IC COMPARATOR QUAD P/P 14-TSSOP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AS1976 | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Ultra-Low Current, 1.8V Comparators |
| AS1976_1 | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:Ultra-Low Current, 1.8V Comparators |
| AS19760FLF | 制造商:TT Electronics / IRC 功能描述:AS19760FLF |
| AS19760HLF | 制造商:TT Electronics / IRC 功能描述:AS19760HLF |
| AS19760JLF | 制造商:TT Electronics / IRC 功能描述:AS19760JLF |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。