Datasheet DHPCA-100 Variable Gain High Speed Current Amplifier 2 8 Features y Transimpedance (Gain) Switchable from 1 x 10 to 1 x 10 V/A y Bandwidth from DC up to 200 MHz y Upper Cut-Off Frequency Switchable to 1 MHz, 10 MHz or Full Bandwidth y Switchable AC/DC Coupling y Adjustable Bias Voltage for Use with External Photo Detectors y Input Protection Against ± 1.5 kV Transients y Local and Remote Control of All Main Functions Applications y Photodiode and Photomultiplier Amplifier y Spectroscopy y Beam Monitoring for Particle Accelerators / Synchrotrons y Ionisation Detectors y Preamplifier for A/D-Converters, HF Lock-Ins, etc. Current to Block Diagram Voltage Converter Buffer-Amplifier and Programmable Programmable Rf = 100 Ω ... 10 MΩ Bandwidth Limiting AC / DC Coupling Gain Amplifier Offset Nulling CURRENT INPUT X 1 VOLTAGE I/U X 10 OUTPUT 10 MHz Low Noise FBW 1 MHz High Speed Overload Detector Stabilized DC-MONITOR Bias Voltage OUTPUT or GND +10 V Parameter Control Unit Supply Voltage Regulator POWER SUPPLY Manual Optocoupler INPUT Bias Buffer Switches Isolate Unit -10 V BIAS MONITOR DIG. CONTROL OUTPUT INPUTS BS-DHPCA_R4 SOPHISTICATED TOOLS FOR SIGNAL RECOVERY DHPCA-100_R9/SP/R9/11NOV10/Page 1 of 9 Datasheet DHPCA-100 Variable Gain High Speed Current Amplifier Specifications Test Conditions Vs = ± 15 V, Ta = 25°C 2 8 Gain Transimpedance 1 x 10 ... 1 x 10 V/A Gain Accuracy ± 1 % Frequency Response Lower Cut-Off Frequency DC / 100 Hz, switchable Upper Cut-Off Frequency dependent on gain setting up to 200 MHz (see table below), switchable to 10 MHz or 1 MHz Input Equ. Input Noise Current see table below Equ. Input Noise Voltage typ. 2.8 nV/√Hz Input Bias Current typ. 20 pA 2 3 4 5 6 7 Performance depending Gain Setting (Low Noise) (V/A) 10 10 10 10 10 10 on Gain Setting ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Upper Cut-Off Frequency (-3 dB) 200 MHz 80 MHz 14 MHz 3.5 MHz 1.8 MHz 220 kHz Rise / Fall Time (10% - 90%) 1.8 ns 4.4 ns 25 ns 0.1 µs 0.2 µs 1.6 µs Input Noise Current Density (/√Hz) 200 pA 16 pA 2.1 pA 500 fA 170 fA 60 fA measured at 1 MHz 1 MHz 1 MHz 10 kHz 10 kHz 10 kHz Integr. Input Noise Current (rms)* 2.2 µA 270 nA 33 nA 5.4 nA 1.1 nA 140 pA Max. Input Current (±) 10 mA 1 mA 0.1 mA 10 µA 1 µA 0.1 µA DC Input Impedance 50 Ω 50 Ω 60 Ω 100 Ω 1 kΩ 10 kΩ 3 4 5 6 7 8 Gain setting (High Speed) (V/A) 10 10 10 10 10 10 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Upper Cut-Off Frequency (- 3 dB) 175 MHz 80 MHz 14 MHz 3.5 MHz 1.8 MHz 220 kHz Rise / Fall Time (10% - 90%) 2.0 ns 4.4 ns 25 ns 0.1 µs 0.2 µs 1.6 µs Input Noise Current Density (/√Hz) 140 pA 6.0 pA 1.5 pA 450 fA 150 fA 55 fA measured at 1 MHz 1 MHz 1 MHz 10 kHz 10 kHz 10 kHz Integr. Input Noise Current (rms)* 1.5 µA 230 nA 30 nA 5.3 nA 1.1 nA 140 pA Max. Input Current (±) 1 mA 0.1 mA 10 µA 1 µA 0.1 µA 10 nA DC Input Impedance 50 Ω 50 Ω 60 Ω 100 Ω 1 kΩ 10 kΩ * The integrated input noise is measured with an open but shielded amplifier input in the full bandwidth (“FBW”) setting. The input referred peak-peak noise can be calculated from the rms noise as follows: I peak-peak = I rms x 6 The output noise is given by: U peak-peak = I peak-peak x Gain Upper cut-off frequencies and equivalent input noise currents given in this table are typical values only which will depend on the source capacitance. Keep the source capacitance as low as possible by using short cables at the input to achieve best possible bandwidth and noise performance. For the dependence of the upper cut-off frequencies on the source capacitance please see the diagrams on the next page. SOPHISTICATED TOOLS FOR SIGNAL RECOVERY Page 2 Datasheet DHPCA-100 Variable Gain High Speed Current Amplifier Specifications (continued) Frequency Response Plots SOPHISTICATED TOOLS FOR SIGNAL RECOVERY Page 3 Datasheet DHPCA-100 Variable Gain High Speed Current Amplifier Specifications (continued) Dependence of Upper Cut-Off Frequency on Source Capacitance 1000 10^2 V/A Low Noise 10^3 V/A High Speed 100 10^3 V/A Low Noise 10^4 V/A High Speed 10 1 1 10 100 1000 Source Capacitance [pF] 100 10^4 V/A Low Noise 10^5 V/A High Speed 10 10^5 V/A Low Noise 10^6 V/A High Speed 1 1 10 100 1000 Source Capacitance [pF] 10 10^6 V/A Low Noise 10^7 V/A High Speed 1 10^7 V/A Low Noise 0.1 0,1 10^8 V/A High Speed 0, 0.01 01 1 10 100 1000 Source Capacitance [pF] SOPHISTICATED TOOLS FOR SIGNAL RECOVERY Page 4 Bandwidth [MHz] Bandwidth [MHz] Bandwidth [MHz] Datasheet DHPCA-100 Variable Gain High Speed Current Amplifier Specifications (continued) Output Voltage Range ± 1 V (@ 50 Ω load), for linear amplification Output Output Impedance 50 Ω (designed for 50 Ω load) Slew Rate 1,000 V/µs Max. Output Current ± 40 mA Output Offset Compensation adjustable by offset trimpot and external control voltage, output offset compensation range min. ± 100 mV DC Monitor Output Monitor Output Gain Mode Monitor Gain ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ low noise gain setting divided by -1 high speed gain setting divided by -10 Monitor Output Polarity inverting Monitor Output Voltage Range ± 1 V (@ ≥ 1 MΩ load) Monitor Output Bandwidth DC ... 1 kHz Monitor Output Impedance 1 kΩ (designed for ≥ 1 MΩ load) Detector Bias Bias Voltage Range ± 10 V, max. 22 mA, connected to shield of BNC input socket, adjustable by trimpot, switchable to GND Warning A bias current of 20 mA may destroy sensitive detectors. Please pay attention to the correct polarity and careful adjustment of the bias voltage to protect your detector. Put the bias switch to GND (ground) if you do not want to use the internal bias voltage. The positive and the negative supply voltage of the amplifier must be switched "on" and "off" simultaneously in order to avoid overvoltage at the bias output. Bias Voltage Monitor Description The signal at the bias voltage monitor output (pin 7 of the Output Sub-D control socket) is identical to the detector bias voltage present on the shield of the input BNC socket. By monitoring the signal on pin 7 the desired bias voltage can be adjusted through the bias trimpot. Even if the bias switch is set to “GND”, the bias voltage can be monitored and set to the desired value. Monitor Output Polarity non-inverting Monitor Output Voltage Range ± 10 V (@ ≥ 1 MΩ load) Monitor Output Impedance 1 kΩ (designed for ≥ 1 MΩ load) Indicator LED Function overload Digital Control Control Input Voltage Range LOW bit: - 0.8 ...+ 1.2 V, HIGH bit: + 2.3 ... + 12 V Control Input Current 0 mA @ 0 V, 1.5 mA @ + 5 V, 4.5 mA @ + 12 V Overload Output non active: 0 V, max. - 1 mA, active: 5.1 V, max. 7 mA Ext. Offset Control Control Voltage Range ± 10 V Offset Control Input Impedance 15 kΩ Power Supply Supply Voltage ± 15 V Supply Current typ. + 110 / - 90 mA (depends on operating conditions, recommended power supply capability min. ± 200 mA) Stabilized Power Supply Output ± 12 V, max. 50 mA, + 5 V, max. 150 mA SOPHISTICATED TOOLS FOR SIGNAL RECOVERY Page 5 Datasheet DHPCA-100 Variable Gain High Speed Current Amplifier Specifications (continued) Weight 320 g (0.74 lb.) Case Material AlMg4.5Mn, nickel-plated Temperature Range Storage Temperature - 40 ... + 100 °C Operating Temperature 0 ... + 60 °C Absolute Maximum Ratings Signal Input Voltage ± 5 V Transient Input Voltage ± 1.5 kV (out of a 1 nF source) Control Input Voltage - 5 V / + 16 V Power Supply Voltage ± 20 V Connectors Input BNC, isolated Output BNC Detector Bias Output shield of input BNC Power Supply LEMO series 1S, 3-pin fixed socket Pin 1: + 15V Pin 2: - 15V Pin 3: GND PIN 2 PIN 1 -Vs +Vs PIN 3 GND Control Port Sub-D 25-pin, female, qual. class 2 Pin 1: + 12 V (stabilized power supply output) Pin 2: - 12 V (stabilized power supply output) Pin 3: AGND (analog ground) Pin 4: + 5 V (stabilized power supply output) Pin 5: digital output: overload Pin 6: DC monitor output Pin 7: bias monitor output Pin 8: output offset control voltage input Pin 9: DGND (ground for digital control pins 10 - 16) Pin 10: digital control input: gain, LSB Pin 11: digital control input: gain Pin 12: digital control input: gain, MSB Pin 13: digital control input: AC/DC Pin 14: digital control input: high speed / low noise mode Pin 15: upper cut-off frequency limit 10 MHz PIN 16: upper cut-off frequency limit 1 MHz PIN 17-25 NC SOPHISTICATED TOOLS FOR SIGNAL RECOVERY Page 6 Datasheet DHPCA-100 Variable Gain High Speed Current Amplifier Remote Control Operation General Remote control input pins are opto-isolated and connected by a logical OR function to the local switch settings. For remote control set the corresponding local switches to “Remote”, "DC", "L” (low noise mode) and "FBW", and select the desired setting via a bit code at the corresponding digital inputs. Mixed operation, e.g. local AC/DC setting and remote controlled gain setting, is also possible. Switch setting “Bias / GND” is not remote controllable. Gain Setting Low Noise High Speed Pin 14=LOW Pin 14=HIGH Pin 12 Pin 11 Pin 10 Gain (V/A) Gain (V/A) MSB LSB ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ 2 3 10 10 LOW LOW LOW 3 4 10 10 LOW LOW HIGH 4 5 10 10 LOW HIGH LOW 5 6 10 10 LOW HIGH HIGH 6 7 10 10 HIGH LOW LOW 7 8 10 10 HIGH LOW HIGH AC/DC Setting Coupling Pin 13 ⎯⎯⎯⎯⎯⎯⎯⎯⎯ DC LOW AC HIGH Low Pass Filter Setting Upper Cut-Off Frequ. Limit Pin 15 Pin 16 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ full bandwidth LOW LOW 10 MHz HIGH LOW 1 MHz LOW HIGH High Speed / Low Noise Setting Mode Pin 14 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ low noise mode LOW high speed mode HIGH SOPHISTICATED TOOLS FOR SIGNAL RECOVERY Page 7 Datasheet DHPCA-100 Variable Gain High Speed Current Amplifier Application Diagrams Photo Detector Biasing through Internal Bias Voltage Source Set bias switch to “Bias”. The photodiode is biased through the amplifier with the bias voltage applied to the shield of the isolated BNC input socket. The photodiode should be mounted in a metal case. For optimum shielding the metal case has to be isolated from the photodiode but connected to the housing of the DHPCA-100. Isolated BNC Input Socket The bias voltage is fed through the shield of the BNC cable. DHPCA-100 Metal Case for Shielding Current to Voltage Converter Current PD Input I/U + 10 V Bias Switch Active Current Bias Limiting Trimpot Bias Buffer - 10 V AZ02-DHPCA_R2 Photo Detector Biasing through External Voltage Source Set bias switch to “GND”. The photodiode is biased through an external voltage source. The shield of the isolated BNC input socket is internally set to amplifier GND. The photodiode should be mounted in a metal case. For optimum shielding the metal case has to be isolated from the photodiode but connected to the housing of the DHPCA-100. External Power Supply + - DHPCA-100 100 Ω 100 nF Current to Voltage Converter Current PD Input I/U Metal Case for Shielding + 10 V Bias Switch Active Current Bias Limiting Trimpot Bias Buffer - 10 V AZ01-DHPCA_R2 SOPHISTICATED TOOLS FOR SIGNAL RECOVERY Page 8 Datasheet DHPCA-100 Variable Gain High Speed Current Amplifier Dimensions 157.0 150.0 137.0 x 1 I / U IN OUT x 10 Remote Overload 3 4 5 6 7 8 10MHz GND 10 10 10 10 10 10 H AC V/A FBW 2 3 4 5 6 7 Bias ±10V Offset 10 10 10 10 10 10 L DC 1MHz 200 80 14 3.5 1.8 220 BW MHz kHz DHPCA-100 ∅ 3.2 all measures in mm unless otherwise noted DZ-DHPCA_R3 FEMTO Messtechnik GmbH Specifications are subject to change without notice. Information furnished herin is believed to Klosterstr. 64 be accurate and reliable. However, no responsibility is assumed by FEMTO Messtechnik D-10179 Berlin x Germany GmbH for its use, nor for any infringement of patents or other rights granted by implication Tel.: +49-(0)30-280 4711-0 or otherwise under any patent rights of FEMTO Messtechnik GmbH. Product names Fax: +49-(0)30-280 4711-11 mentioned may also be trademarks used here for identification purposes only. e-mail: info@femto.de © by FEMTO Messtechnik GmbH http://www.femto.de Printed in Germany SOPHISTICATED TOOLS FOR SIGNAL RECOVERY Page 9 51.0 44.0 27.3 15.0 15.0 43