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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	± V_S
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	V_OS			2	5	mV
Input Offset Current	I_OS			0.1	0.6	A
Input Bias Current	I_B			1.5	4	A
Input Capacitance	C_IN			4		pF
Differential Input Resistance	R_IN			44		k Ohm
Common-Mode Input Resistance	R_IN		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	A_LFC A_LF A_HFC A_HF	Compensated Uncompensated Compensated Uncompensated	66 73 18 26	68 76 21 28		dB dB dB dB
Pulse Risetime (A_V = 10)	t_rc t_r	Compensated Uncompensated		15 9	22 15	ns ns
Output Voltage Swing	V_OP V_ON	Positive Negative	+4.2	+4.4 -5.0	-5.5	V V
Open Loop Output Resistance	R_O			750		Ohm
Output Short-Circuit Current	I_OSC	Source Sink		11 -4		mA mA
Slew Rate	S_RP S_RN	Positive Negative	65 35	100 40		V/s V/s
Input Noise Voltage Density	e_n			4		nV/Hz
Supply Voltage	V_S		±4.5	±6	±8	V
Supply Current	I_S		±1.1	±1.25	±1.4	mA
Power Consumption	P_d			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).