1
dc1416fa
DEMO MANUAL DC1416
DESCRIPTION
LT1222 and LT1793
Low Noise
Transimpedance Amplifier
Demonstration circuit 1416 is a low noise transimpedance
amplifier. It utilizes the low voltage noise
LT
®
1222
op amp,
and the low current noise
LT1793
op amp, along with the
discrete NXP JFET BF862
1
or equivalent, allowing the user
to take advantage of each component’s particular opti-
PERFORMANCE SUMMARY
mization. These components are arranged with jumpers
allowing various composite configurations. A socketed
photodiode, OSRAM SFH213, is also provided.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1416
Specifications are at T
A
= 25°C, V
S
= ±12V
SYMBOL
PARAMETER
CONDITIONS
TYP
UNITS
V
S
Supply Voltage
±12
V
A
Z
TIA Gain
1M
Ω
V
OS
Input Offset Voltage
LT1793 (V
OS
+ I
BIAS
• 10M)
300
µV
dV
OS
/dT
Input Offset Voltage Drift
LT1793 (dV
OS
/dT +dI
BIAS
/dT • 10M)
10
µV/C
I
BIAS
Input Bias Current
BF862
1
6
pA
en
Input Voltage Noise Density
f = 100kHz, JFET In Gain Configuration
1
nV/√
Hz
en
Input Voltage Noise Density
f = 100kHz, Source Follower Configuration
3
nV/√
Hz
C
IN
Input Capacitance
f = 10kHz, Source Follower Configuration
2
pF
GBW
Gain Bandwidth Product
JP In (C
COMP
= 49pF)
70
MHz
GBW
Gain Bandwidth Product
JP Out (C
COMP
= 10pF)
190
MHz
GBW
Gain Bandwidth Product
JP Out, C7 Removed (C
COMP
= 0pF)
500
MHz
BW
–3dB Bandwidth
With SFH213, 1MΩ Gain, JP7 Out
2
MHz
V
OUT
Output Voltage Swing
Cathode Input, Integrator In
0 to 10
V
V
OUT
Output Voltage Swing
Cathode Input, Integrator Out
–0.4 to –10
V
V
OUT
Output Voltage Swing
Anode Input, Integrator In
0 to –10
V
V
OUT
Output Voltage Swing
Anode Input, Integrator Out
–0.4 to –10
V
I
CC
Supply Current
V
S
= ±12V
17
mA
I
BIAS
Input Bias Current
BF862
1
6
pA
PSRR
Power Supply Rejection Ratio
±5V to ±15V, Integrator In
95
dB
Note 1)
BF862 has been obsoleted as of 2017. On-Semi 2SK932-22 has been substituted, with practically identical performance.
All registered trademarks and trademarks are the property of their respective owners.
Downloaded from
