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HQV800
SERIES, 8-CHANNEL FET PREAMPLIFIERS
HQV802 TIMING PREAMPLIFIER
HQV810 SILICON STRIP DETECTOR PREAMPLIFIER
HQV820 PHOTODIODE PREAMPLIFIER
- Compact, 8 Channels in 24-Pin DIP
- Low Noise, < 250 Electrons R.M.S.
- High Charge Sensitivity, 0.5 V/pC
- Wide Dynamic Range, > 30,000:1
- Fast Signal Rise Time, < 15 nsec
- 50 ohm Drive Capability
- Wide Range of Supply Voltages, ±3 to ±12 V
- Low Power Consumption,15 mW/Channel at ±3 V
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)
Copyright© May 1996. LeCroy is a registered trademark of LeCroy
Corporation. All rights reserved. Information in this publicaction supersedes
all earlier versions.