LT1806CS6-PBF LINER [Linear Technology], LT1806CS6-PBF Datasheet - Page 28

• Manufacturer Part Number: LT1806CS6-PBF
• Description: 325MHz, Single/Dual,Rail-to-Rail Input and Output, Low Distortion,Low Noise Precision Op Amps
• Manufacturer: LINER [Linear Technology]

FET Input, Fast, High Gain Photodiode Amplifi er
Figure 10 shows a fast, high gain transimpedance
amplifi er applied to a photodiode. A JFET buffer is used
for its extremely low input bias current and high speed.
The LT1097 and 2N3904 keep the JFET biased at I
for zero offset and lowest voltage noise. The JFET then
drives the LT1806, with R
back to the JFET input and setting the transimpedance
gain. C4 helps improve the phase margin of the fast loop.
Output voltage noise density was measured as 9nV/√Hz
with R
LT1806/LT1807
TYPICAL APPLICATION
RELATED PARTS
PART NUMBER
LT1395
LT1399
LT1632/LT1633
LT1809/LT1810
28
F
short circuited. With R
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
DESCRIPTION
400MHz Current Feedback Amplifi er
Triple 300MHz Current Feedback Amplifi er
Dual/Quad 45MHz, 45V/μs Rail-to-Rail Input and Output Amplifi ers
Single/Dual 180MHz Input and Output Rail-to-Rail Amplifi ers
PHOTODIODE
●
SFH213FA
SIEMENS/
INFINEON
FAX: [phone]
F
closing the high speed loop
V
S
F
–
varied from 100k to 1M,
R1
10M
3
2
Figure 10. Fast, High Gain Photodiode Amplifi er
●
100mV/DIV
+
–
www.linear.com
LT1097
Figure 11. Step Response with R
V
V
S
S
+
7
4
–
2200pF
C2
6
0.1μF
C3
C1
100pF
DSS
1M
R2
R3
10k
R4
2.4k
20ns/DIV
V
V
2N3904
S
S
total output noise was below 1mV
10MHz bandwidth. Table 4 shows results achieved with
various values of R
response with R
Table 4. Results Achieved for Various R
2N5486
–
+
R5
33Ω
2
3
–
+
LT1806
100k
200k
499k
1M
R
R
COMMENTS
800V/μs Slew Rate, Shutdown
0.1dB Gain Flatness to 150MHz, Shutdown
High DC Accuracy 1.35mV V
Max Supply Current 5.2mA/Amp
350V/μs Slew Rate, Shutdown, Low Distortion –90dBc at 5MHz
F
V
V
F
S
S
*
F
+
7
4
–
18067 F11
*ADJUST PARASITIC CAPACITANCE AT
V
= 499k
R
CHARACTERISTICS
S
F
= 5V
3pF
C4
FOR DESIRED RESPONSE
6
F
49.9Ω
= 499k.
F
10% to 90%
and Figure 11 shows the time domain
RISE TIME
154ns
263ns
64ns
94ns
© LINEAR TECHNOLOGY CORPORATION 2000
OS(MAX)
50W
18067 F10
V
OUT
, 70mA Output Current,
RMS
F
LT 0908 REV B • PRINTED IN USA
, 1.2V Output Step
BANDWIDTH
measured over a
6.8MHz
4.6MHz
1.8MHz
3MHz
–3dB
18067fb