数据搜索系统,热门电子元器件搜索 |
|
LT6012 数据表(PDF) 17 Page - Linear Technology |
|
LT6012 数据表(HTML) 17 Page - Linear Technology |
17 / 28 page LTC6258/LTC6259/LTC6260 6258960fa 17 For more information www.linear.com/LTC6258 APPLICATIONS INFORMATION – + 5V V+ OUT LTC6258 6258960 F05a 22µF 22µF RIN1 2.7k 22µF IN OUT GND LT6656 Figure 5a. Low Noise Reference Use LT6656 for a Low Current Starting Reference Figure 5b. Noise Density, Reference Buffer Figure 5c. Reference Buffer Transient Response * 2.7k + 22µF FILTER OP AMP, 44µF CLOAD OP AMP FILTERED REFERENCE REFERENCE OUTPUT INSTRUMENT ONLY FREQUENCY (kHz) 0.01 0.1 1 10 100 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 6258 F05b This circuit takes advantage of the ability of the LTC6259 to drivelargecapacitiveloads.Useofalargeoutputcapacitor attached to the LT6659 enables significant bypassing of follow-oncircuitsthatusethereferencevoltage.Intotal,the combinationofLT6656andLTC6259,inthisconfiguration, develops a reference voltage, with low noise, at low power, and with appreciably large available bypass capacitance. Voltage spectral noise densities are shown in Figure 5b. Larger noise from the reference below 10kHz noticeably drops down once a filter (RIN1 and CIN1) follow the refer- ence. The op amp, configured in unity gain, with a large 44µF load, remains stable and contributes only a small amount of low frequency noise. Figure 5c shows the tran- sient response of the combination of RIN1-CIN1 filter and op amp circuit, with and without the 44µF output capacitor. Figure 5c shows the time domain response of the refer- ence buffer. The total measured supply current consumption is 21µA. Analog LED Control Figure 6a shows a voltage controlled LED drive circuit. When VIN is at 0V, the op amp supply current is nominally 20μA. The offset, for example, could be 450µV, appears across R1, inducing a 0.45mA current in the LED. Some applications want a guaranteed zero LED current at VIN = 0, and this is the purpose of R5. R5 forces 2.5μA currentthroughR7,creatinganegative0.6mVsenseoffset. This offset guarantees a zero LED current. INPUT NO 44µF OUTPUT CAP ADD 44µF OUTPUT CAP 200ms/Div 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 6258 F05c |
类似零件编号 - LT6012 |
|
类似说明 - LT6012 |
|
|
链接网址 |
隐私政策 |
ALLDATASHEETCN.COM |
ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |