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LT1311 Datasheet

  • LT1311

  • Quad 12MHz, 145ns Settling Precision Current-to-Voltage Conv...

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LT1311
Quad 12MHz, 145ns Settling
Precision Current-to-Voltage
Converter for Optical Disk Drives
FEATURES
s
s
s
s
s
s
s
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s
DESCRIPTION
The LT
廬
1311 is a quad current-to-voltage converter de-
signed for the demanding requirements of photo diode
amplification. A new approach to current-to-voltage con-
version provides excellent DC and AC performance with-
out external DC trims or AC frequency compensation. The
LT1311 is ideal for converting multiple photo diode cur-
rents to voltages and for general purpose matched invert-
ing amplifier applications.
The LT1311 contains four current feedback amplifiers,
each with an internal 20k feedback resistor. A supply
bypass capacitor is the only external component required
to convert four signal currents to voltages. Unlike voltage
feedback-based current-to-voltage converters that oper-
ate with only a specified value of input capacitance, the
current feedback LT1311 settles cleanly with any input
capacitance up to 50pF. Only in the most demanding
applications will the LT1311 need to be mounted close to
the photo diodes.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Four Complete Current-to-Voltage Converters
14-Lead Small Outline Package
Accurate Gain: 20mV/
碌
A,
鹵
4%
Low Offset Error: 250nA Max
Low Offset Drift: 2.5nA/擄C Max
Fast Settling: 145ns to 0.1% for a 2V Step
Wide Bandwidth: 12MHz
Low Noise: 5pA/鈭欻z
Low Quiescent Current: 11mA Max
Wide Supply Range:
鹵2V
to
鹵18V
or 4V to 36V
APPLICATIONS
s
s
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Optical Disk Drive
Photo Diode Amplifiers
Focus and Tracking Summing Amplifiers
Color Scanners
RGB Amplifiers
Selectable Gain Amplifiers
Matched Inverting Amplifiers
TYPICAL APPLICATION
Photo Diode Current-to-Voltage Converter
V
CC
10V
1 IN A
0.1碌F
2
3 IN B
4 BIAS
5 IN C
6
7 IN D
+
鈥?/div>
OUT A
14
13
OUT B
12
C
IN
= 1pF
+
鈥?/div>
LT1311
+
鈥?/div>
C
IN
= 20pF
5V
11
OUT C
10
9
C
IN
= 50pF
+
鈥?/div>
OUT D
8
INPUT = 100碌A(chǔ) STEP
V
S
=
鹵5V
1311 TA01
U
U
U
Transient Response
1311 TA02
1

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