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LT6012 数据表(PDF) 17 Page - Linear Technology

部件名 LT6012
功能描述  1.3MHz, 20關A Power Efficient Rail-to-Rail I/O Op Amps
Download  28 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT6012 数据表(HTML) 17 Page - Linear Technology

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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


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