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HQV800 SERIES, 8-CHANNEL FET PREAMPLIFIERS

HQV802 TIMING PREAMPLIFIER

HQV810 SILICON STRIP DETECTOR PREAMPLIFIER

HQV820 PHOTODIODE PREAMPLIFIER

FOR USE WITH SILICON STRIP DETECTORS, TIME PRO JECTION CHAMBERS AND OTHER LOW NOISE APPLICATIONS


The HQV800 Series are extremely compact, low noise charge sensitive hybrid FET preamplifiers in an 8-channel package. They can be used wherever total output charge is a key parameter. Three versions are available, offering different speed/noise trade-offs. The HQV802-M is intended for timing applications, the HQV810 for silicon strip detectors and Time Projection Chambers (TPC), and the HQV820-M is suited for applications requir ing long shaping time such as wire chamber strips and pads or photodiode readout of calorimeters. All models can tolerate input shunt (detector) capacitance up to 300 pF.

The HQV810 is packaged in a standard 24-pin Ceramic DIP, making it ideal for high density applications. The HQV802-M and the HQV820-M are packaged in 24-pin low mass DIPs with 0.7" pin row spacing. All models are designed to operate with a wide range of supply voltages from ±3 V up to ±12 V. At the lower setting they dissi pate 15mW/channel with remote output driver pull down resistors. This is also ideal for high density applications. When used with higher supply voltages, the HQV800 Series can provide extremely high dynamic range response at the expense of power dissipation.

SPECIFICATIONS

Channels: 8. Figure 1 shows a typical channel.

Inputs: Negative, charge sensitive. DC-coupled. Quiescent voltage -1 V ±0.8 V. Internal protection diode to V ­p;. Maximum allowed input shunt capacitance: 300 pF.

Conversion Gain: -0.5 V/pC ±20% (inverting).

Outputs: Open-ended NPN emitter followers. Quiescent voltage -1 V ±0.8 V. Require external pull-down resis tors to V­p;.

Maximum Output Voltage Swing: 2 V positive swing, into load 50 ohm. Figure 4 for supply voltages other than ±6 V.

Maximum Output Signal Current: 50 mA (< 10% duty cycle) per output.

Output Impedance: < 10 ohm, slightly depending on pull-down resistor used. Suitable for driving 50 ohm loads.

Open Loop Gain: 1,000 typical (see Figure 6).

Integral Non-Linearity: 0.2%, typical, between 0 and 1.5 V.

Channel-to-Channel Crosstalk: 0.3% typical, measured with a shaping time of 250nsec.

Supply Voltages: V+ = +3 to +12 V, V­p; = -3 to -12 V. V+ - V­p; < 20 V.

Power Consumption: < 20 mW/channel with ±3 V supplies. See Figure 3 for other voltages.

Package: Standard 24-pin DIP for HQV810, 24-pin DIP with 0.7" row spacing for HQV802-M and HQV820-M. See Figure 7 for dimensions.

Operating Temperature: 0° to 60°C.

Notes

1. Specifications apply to all model numbers except where otherwise stated.

2. Unless otherwise stated, all specifications are at 25°C, V + = 6 V, V­p; = -6 V, pull-down resistors are 3.9 kohm to V­p; resulting in 1 mA standing current in output emitter followers.

Figure 1: Input and Output Circuit of One Channel of HQV800 Series

Figure 2: Pin Assignment and Typical Use of the HQV800 Series

Figure 3: Power Consumption vs. Positive Supply Voltage

Figure 4: Maximum Positive Output Voltage Swing vs.Positive Supply Voltage

Figure 5: Relative Gain vs. Positive Supply Voltage

Figure 6: Open Loop Gain for HQV800 Series

Figure 7A: Low Mass Package Dimension (HQV802-M, HQV820-M)

Figure 7B: Standard Ceramic Package (HQV810)

HQV800 SERIES SELECTION CHART

Copyright© May 1996. LeCroy is a registered trademark of LeCroy Corporation. All rights reserved. Information in this publicaction supersedes all earlier versions.