Pulse Amplifier A275

The A275 is a high performance hybrid differentialop-amp developed as a pulse amplifier for spaceborne nuclear instrumentation.

Its low power dissipation (15 mW), high slew rate (100 V/μs), and low input noise (4 nV/√Hz), make it ideal for use in a wide range of op-amp applications. The A275 is packaged in a standard 14-pin hybrid DIP.



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產(chǎn)品詳情


Features
Applications
? Power 15 mW
? Space instrumentation
? Slew rate 100 V/μs
? Portable instrumentation
? Input noise 4 nV/√Hz
? Nuclear instrumentation
? Stable DC operation
? Precision active filter design
? 200 MHz gain-bandwidth product
? Pulse shaping
? High reliability screening

? Unity gain stable


CONNECTION and PACKAGE DIAGRAMS
PIN
FUNCTION
1
Inverting input
2
Non-inverting Input
3
Bias adjust to Pin 4, (R>3 kohm)
4
-Vs direct
5
-Vs through 50 ohms
6
Compensation to Pin 7, (C = 0-5 pF)
7
Case and Ground
8
Output through 50 ohms
9
Output direct
10
+Vs through 50 ohms
11
+ Vs direct
12/13/14
Compensation: Leave open for gain <10;
Short for gain >10

APPLICATION NOTES
The A250 Connected to a Solid State Detector
with 5 pole shaping and active baseline restoration


General Case for 3 and 5 Pole Response for Different Peaking Times (Tp)



OPERATING NOTES



Circuit Layout Considerations
Due to the high bandwidth of the A275, care should be taken in circuit layout. In general, ground plane construction is recommended. Input and output lines should be well separated and in most cases shielding will be necessary. Grounding the physical case of the A275 (in addition to Pin 7) to the ground plane can be used to avoid oscillations or electronic pick-up.
The A275 can be tested as a shaping amplifier by using the circuit shown in the next page. The PC-275 Test Board (shown below) accommodates three (3) A275s and a BLR1 and produces a 5 pole pulse with 1 μs risetime (2.3 μs peaking time).



PC-275 TEST BOARD for the A275
A275F
The A275FC and A275FN are high density versions of the Amptek A275 and feature a
Single In-line Package (SIP).

Please visit our web site at www.amptek.com for complete details.


A275 SPECIFICATIONS
Absolute Maximum Ratings
Supply Voltage
±8 V
Input Voltage
± VS
Operating Temperature
-55℃ to +125℃
Storage Temperature
-65℃ to +150℃
Lead Temperature Range (Soldering, 10 sec.) 
300℃

Electrical Characteristics VS = ±6V, TA = +25℃
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Offset Voltage
VOS


2 5
mV
Input Offset Current
IOS


0.1 0.6 A
Input Bias Current
IB


1.5
4 A
Input Capacitance
CIN


4
pF
Differential Input Resistance
RIN


44
k Ohm
Common-Mode Input Resistance
RIN
5 8
M Ohm
Common-Mode Rejection Ratio
CMRR

90 95
dB
Common-Mode Input Range
IVR


±4.5

V
Power Supply Rejection Ratio
PSRR


60
dB
Large-Signal Voltage Gain
@5 kHz
@5 kHz
@10 MHz
@10 MHz
ALFC
ALF
AHFC
AHF
Compensated
Uncompensated
Compensated
Uncompensated
66
73
18
26
68
76
21
28

dB
dB
dB
dB
Pulse Risetime (AV = 10)
trc
tr
Compensated
Uncompensated

15
9
22
15
ns
ns
Output Voltage Swing
VOP
VON
Positive
Negative
+4.2

+4.4
-5.0

-5.5

V
V
Open Loop Output Resistance
RO


750
Ohm
Output Short-Circuit Current
IOSC
Source
Sink

11
-4

mA
mA
Slew Rate
SRP
SRN
Positive
Negative
65
35
100
40

V/s
V/s
Input Noise Voltage Density
en


4
nV/Hz
Supply Voltage
VS

±4.5
±6
±8
V
Supply Current
IS

±1.1
±1.25
±1.4
mA
Power Consumption
Pd


15
mW

General
Package
14 Pin Hybrid DIP
Test Board
PC275
Screening
(see web site: www.amptek.com/hybrids.html)
Amptek High Reliability Screening (Standard)
Option 1
Option 2
Other Package
(see web site: www.amptek.com/A275f.html)
A275FC or A275FN High-density versions of the
Amptek A275 in a Single In-line Package (SIP).


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