LT6231CS8#TR Linear Technology, LT6231CS8#TR Datasheet - Page 24

• Manufacturer Part Number: LT6231CS8#TR
• Description: IC OP AMP DUAL 215MHZ R-R 8-SOIC
• Manufacturer: Linear Technology

Specifications of LT6231CS8#TR

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Slew Rate: 70 V/µs
• Gain Bandwidth Product: 215MHz
• Current - Input Bias: 5µA
• Voltage - Input Offset: 50µV
• Current - Supply: 3.3mA
• Current - Output / Channel: 30mA
• Voltage - Supply, Single/dual (±): 3 V ~ 12.6 V, ±1.5 V ~ 6.3 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• -3db Bandwidth: -

LT6230/LT6230-10
LT6231/LT6232
Typical applicaTions
The LT6230 is applied as a transimpedance amplifier with
an I-to-V conversion gain of 1.5kΩ set by R1. The LT6230
is ideally suited to this application because of its low
input offset voltage and current, and its low noise. This is
because the 1.5k resistor has an inherent thermal noise
of 5nV/√Hz or 3.4pA/√Hz at room temperature, while the
LT6230 contributes only 1.1nV and 2.4pA /√Hz. So, with
respect to both voltage and current noises, the LT6230 is
actually quieter than the gain resistor.
The circuit uses an avalanche photodiode with the cathode
biased to approximately 200V. When light is incident on
relaTeD parTs
PART NUMBER
LT1028
LT1677
LT1806/LT1807
LT6200/LT6201
LT6202/LT6203/LT6204
24
Low Power Avalanche Photodiode Transimpedance Amplifier
WWW.ADVANCEDPHOTONIX.COM
ADVANCED PHOTONIX
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
012-70-62-541
OUTPUT OFFSET = 500µV TYPICAL
BANDWIDTH = 20MHz
OUTPUT NOISE = 1.1mV
≈200V BIAS
DESCRIPTION
Single, Ultralow Noise 50MHz Op Amp
Single, Low Noise Rail-to-Rail Amplifier
Single/Dual, Low Noise 325MHz Rail-to-Rail Amplifier
Single/Dual, Low Noise 165MHz
Single/Dual/Quad, Low Noise, Rail-to-Rail Amplifier
●
FAX: [phone]
0.1µF
1.5k
I
R2
C2
S
= 3.3mA
P-P
(100MHz MEASUREMENT BW)
+
–
LT6230
ENABLE
4.7pF
1.5k
R1
C1
●
www.linear.com
–5V
5V
623012 TA02a
the photodiode, it induces a current I
the amplifier circuit. The amplifier output falls negative
to maintain balance at its inputs. The transfer function
is therefore V
good settling characteristics. Output offset was measured
at 280µV, so low in part because R2 serves to cancel the
DC effects of bias current. Output noise was measured
at 1.1mV
C2 shunting R2’s thermal noise. As shown in the scope
photo, the rise time is 17ns, indicating a signal bandwidth
of 20MHz.
COMMENTS
0.85nV/√Hz
3V Operation, 2.5mA, 4.5nV/√Hz, 60µV Max V
2.5V Operation, 550µV Max V
0.95nV√Hz, Rail-to-Rail Input and Output
1.9nV/√Hz, 3mA Max, 100MHz Gain Bandwidth
Photodiode Amplifier Time Domain Response
P-P
on a 100MHz measurement bandwidth, with
OUT
= –I
PD
• 1.5k. C1 ensures stability and
50ns/DIV
 LINEAR TECHNOLOGY CORPORA TION 2003
OS
, 3.5nV/√Hz
LT 0111 REV C • PRINTED IN USA
PD
623012 TA02b
which flows into
OS
623012fc