AMP A275 PULSE AMPLIFIER TEK FEATURES • Power 15 mW • Slew Rate 100 V/µs • Input Noise 4 nV/√Hz • Stable DC Operation • 200 MHz Gain-Bandwidth Product • High Reliability Screening 5 • Radiation Hard to10 rad(Si) • Unity Gain Stable APPLICATIONS • Space Instrumentation • Portable Instrumentation • Nuclear Instrumentation • Precision Active Filter Design • Pulse Shaping The A275 is a high performance hybrid differential op-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. Compensation Compensation +6V < 5pF 14 13 12 11 47nF 10 6 7 50 2 A275 Input 9 Output 50 1 47nF 3 8 50 4 5 > 3k -6V Bias adjust Figure 1. - Connection diagram Pin 1 2 3 4 5 6 7 8 9 10 11 12 - 14 Function Inverting input Non-inverting input Bias adjust to Pin 4, (R > 3 kohm) -Vs direct -Vs through 50 ohms Compensation to Pin 7, (C = 0 to 5 pF) Case and Ground Output through 50 ohms Output direct +Vs through 50 ohms +Vs direct Compensation (leave open for gain < 10, short for gain > 10) AMPTEK,INC. 6 DE ANGELO DRIVE, BEDFORD, MA 01730 U.S.A. TEL: +1 (781) 275-2242 FAX: +1 (781) 275-3470 email: [email protected] http://www.amptek.com Absolute Maximum Ratings Supply Voltage Input Voltage Operating Temperature Storage Temperature Lead Temperature Range (Soldering, 10 sec.) Electrical Characteristics VS = ±6 V, TA = +25 °C Parameter Symbol Conditions Input Offset Voltage VOS Input Offset Current IOS Input Bias Current IB Input Capacitance CIN Differential Input Resistance RIN Common-Mode Input Resistance RIN Common-Mode Rejection Ratio CMRR Common-Mode Input Range IVR Power Supply Rejection Ratio PSRR Large-Signal Voltage Gain compensated ALFC @5kHz uncompensated ALF @5kHz compensated AHFC @10MHz uncompensated AHF @10MHz Pulse Risetime (A V = 10) trc compensated tr uncompensated Output Voltage Swing VOP positive VON negative Open Loop Output Resistance RO Output Short-Circuit Current lOSC source sink Slew Rate SRP positive SRN negative Input Noise Voltage Density eN Supply Current IS Power Consumption PD ±8 V ±VS -55 °C to +125 °C -65 °C to +150 °C +300 °C Min 5 90 64 72 16 24 +4.5 65 35 ±1.1 Typ 2 0.1 1.5 4 44 8 95 ±4.5 60 66 74 20 28 15 9 +4.7 -4.5 750 11 -4 100 57 4 ±1.25 15 Max 5 0.6 4 Units mV µA µA pF kohm Mohm dB V dB dB 22 15 ns V -4.5 ohm mA V/µs ±1.4 nV/√Hz mA mW Figure 2. - A275 gain & phase The A275 can be tested as a shaping amplifier by using the circuit shown in Figure 3. The PC-275 TEST BOARD will accommodate three (3) A275s and will produce a 5-pole pulse with 1 µs risetime (2.3 µs peaking time). Figure 3. - A275 pulse characteristics 3-pole shaping +HV +6V 1M +6V 14 10 10nF (HV) 13 12 10 +6V 47uH 14 866 13 12 10 200ns time to peak 13 3M (pole-zero) 44mV/MeV 14 2 440mV/MeV 9 A250 100M 1.5V/MeV 9 A275 100pF (NPO) 2 A275 168pF (NPO) 1 Output 9 1 10nF (HV) 1.07k JFET 7 5 7 5 -6V 8.87k 7 -6V 5 8.87k -6V Solid state detector +6V 1.10k 7 4 12 1.10k Active baseline restoration BLR1 6 8 9 -6V Figure 4. - The A250 connected to a solid state detector with 3-pole shaping and active baseline restoration. Figure 5. - General case for 3 and 5-pole response for different peaking times (T P)