THORLABS PDA100A2 Bedienungsanleitung

PDA100A2

Si Switchable Gain

Detector

User Guide

Si Switchable Gain Detector

Table of Contents

Chapter 1 Warning Symbol Definitions ...........................................1

Chapter 2 Description........................................................................2

Chapter 3 Setup..................................................................................3

Chapter 4 Operation...........................................................................4

4.1. Theory of Operation......................................................4

4.2. Responsivity .................................................................4

4.3. Dark Current.................................................................4

4.4. Bandwidth and Response ..............................................5

4.5. Terminating Resistance.................................................5

4.6. Gain Adjustment...........................................................5

Chapter 5 Troubleshooting...............................................................6

Chapter 6 Specifications...................................................................7

6.1. Response Curve.............................................................9

6.2. Mechanical Drawing ...................................................10

Chapter 7 Certificate of Conformance ...........................................11

Chapter 8 Regulatory.......................................................................12

Chapter 9 Thorlabs Worldwide Contacts.......................................13

Si Switchable Gain Detector Chapter 1: Warning Symbol Definitions

Rev D, April 21, 2020 Page 1

Chapter 1 Warning Symbol Definitions

Below is a list of warning symbols you may encounter in this manual or on your

device.

Symbol

Description

Direct Current

Alternating Current

Both Direct and Alternating Current

Earth Ground Terminal

Protective Conductor Terminal

Frame or Chassis Terminal

Equipotentiality

On (Supply)

Off (Supply)

In Position of a Bi-Stable Push Control

Out Position of a Bi-Stable Push Control

Caution: Risk of Electric Shock

Caution: Hot Surface

Caution: Risk of Danger

Warning: Laser Radiation

Caution: ESD Sensitive Components

Si Switchable Gain Detector Chapter 2: Description

Page 2 TTN1134694-D02

Chapter 2 Description

The PDA100A2 is an amplified, switchable-gain, Silicon (Si) detector designed

for detection of light signals ranging from 320 nm to 1100 nm. An eight-position

rotary switch allows the user to vary the gain in 10 dB steps. A buffered output

drives 50 Ω load impedances up to 5 V. The PDA100A2 housing includes a

removable threaded coupler (SM1T1) and retainer ring (SM1RR) that is

compatible with any number of Thorlabs 1” threaded accessories. This allows

convenient mounting of external optics, light filters, apertures, as well as

providing an easy mounting mechanism using Thorlabs’cage assembly

accessories. Also included is a ±12 V power supply.

ESD Caution

The components inside this instrument are ESD sensitive. Take all appropriate

precautions to discharge personnel and equipment before making any electrical

connections to the unit.

Si Switchable Gain Detector Chapter 3: Setup

Rev D, April 21, 2020 Page 3

Chapter 3 Setup

The detector can be set up in many different ways using our extensive line of

adapters. However, the detector should always be mounted and secured for best

operation.

1. Unpack the optical head, install either an imperial or metric optical post

into one of the mounting holes located on the bottom and side of the

sensor, and mount using a post holder. Note that these detectors

feature tapped holes that accept both 8-32 and M4 threads, so using

either imperial or metric TR posts is possible.

2. Connect the power supply 3-pin plug into the power receptacle on the

PDA100A2.

3. Plug the power supply into a 50 to 60Hz, 100 V / 120 V / 230 V power

outlet.

4. Attach a 50 Ω coax cable (i.e. RG-58U) to the output of the PDA. When

running cable lengths longer than 12" we recommend terminating the

opposite end of the coax with a 50 Ωresistor (Thorlabs p/n T4119) for

maximum performance. Connect the remaining end to a measurement

device such as an oscilloscope or high speed DAQ card. Caution:

Many high speed oscilloscopes have input impedances of 50 Ω. In this

case, do not install a 50 Ω terminator. The combined loads will equal

25 Ω which could allow ~135 mA of output current. This will damage the

output driver of the PDA100A2.

5. Power the PDA100A2 on using power switch located on top side of unit.

Caution!

The active detector area in the PDA100A2 is offset from the front of the housing.

When using fiber adapters, make sure that the fiber ferrule does not crash into

the detector. Failure to do so may cause damage to the diode and/or the fiber.

6. Install any desired filters, optics, adapters, or fiber adapters to the input

aperture.

7. During alignment, take appropriate precautions, such as using reduced

radiation power, or other precautions, and use proper eye and/or skin

protection as recommended by the radiation source manufacturer.

8. Apply a light source to the detector. Adjust the gain to the desired

setting.

Si Switchable Gain Detector Chapter 4: Operation

Page 4 TTN1134694-D02

Chapter 4 Operation

4.1. Theory of Operation

Thorlabs PDA series are ideal for measuring both pulsed and CW light sources.

The PDA100A2 includes a reverse-biased PIN photo diode, mated to a

switchable gain transimpedance amplifier, and packaged in a rugged housing.

4.2. Responsivity

The responsivity of a photodiode can be defined as a ratio of generated

photocurrent (IPD) to the incident light power (P) at a given wavelength:

󰇛󰇜



4.3. Dark Current

Dark current is leakage current which flows when a bias voltage is applied to a

photodiode. The PDA with Transimpedance Amplifier does control the dark

current flowing out. Looking at the figure above, it can be noted that Point B is

held at ground and the amplifier will try to hold point A to “Virtual Ground”. This

minimizes the effects of dark current present in the system.

The dark current present is also affected by the photodiode material and the size

of the active area. Silicon devices generally produce low dark current compared

to germanium devices which have high dark currents. The table below lists

several photodiode materials and their relative dark currents, speeds, sensitivity,

and costs. Please note that sensitivity values in the table are typical values;

Thorlabs offers photodetectors with sensitivity ranges that vary from those shown

below.

Si Switchable Gain Detector Chapter 4: Operation

Rev D, April 21, 2020 Page 5

Material

Dark Current

Speed

Sensitivity1

Cost

Silicon (Si)

Low

High

400 - 1000 nm

Low

Germanium (Ge)

High

Low

900 - 1600 nm

Low

Gallium Phosphide (GaP)

Low

High

150 - 550 nm

Med

Indium Gallium Arsenide

(InGaAs)

Low

High

800 - 1800 nm

Med

Extended Range: Indium

Gallium Arsenide (InGaAs)

High

1200 - 2600 nm

High

4.4. Bandwidth and Response

For the PDA detectors, the gain of the detector is dependent on the feedback

element (Rf). The bandwidth of the detector can be calculated using the

following:

󰇛󰇜



GBP is the amplifier gain bandwidth product and CDis the sum of the photodiode

junction capacitance and the amplifier capacitance.

4.5. Terminating Resistance

The maximum output of the PDA100A2 is 10 V for high impedance loads (i.e.

RLoad > 5 kΩ) and 5 V for 50 Ω loads. Adjust the gain so that the measured signal

level out of the PDA100A2 is below 10 V (5 V with a 50 Ω load) to avoid

saturation.

For low terminating resistors, <5 kΩ or 1% error, an additional factor needs to be

considered. The output of the PDA includes a 50 Ω series resistor (Rs). The

output load creates a voltage divider with the 50 Ω series resistor as follows:

 







󰇛󰇜󰇛󰇜

Note that we already include the scale factor in our specification for the gain at

50 Ω. Refer to the table in Chapter 6 for additional performance specifications.

4.6. Gain Adjustment

The PDA100A2 includes a low noise, low offset, high gain transimpedance

amplifier that allows gain adjustment over a 70 dB range. The gain is adjusted by

rotating the gain control knob, located on the top side of the unit. There are 8

gain positions incremented in 10 dB steps. It is important to note that the

bandwidth will decrease as the gain increases. See the specifications table on

page 7 to choose the best gain verse bandwidth for a given input signal.

Approximate values; actual wavelength values will vary.

Si Switchable Gain Detector Chapter 5: Troubleshooting

Page 6 TTN1134694-D02

Chapter 5 Troubleshooting

Problem

Suggested Solutions

There is no signal response.

Verify that the power is switched on and all

connections are secure.

Verify the proper terminating resistor is installed

if using a voltage measurement device.

Verify that the optical signal wavelength is within

the specified wavelength range.

Verify that the optical signal is illuminating the

detector active area.

Output Voltage will not increase.

Detector Output is skewed.

Check to make sure the detector is not

saturated. Refer to the Output Voltage spec. in

the table on page 7.

Install a 1" Lens Tube (SM1L10) to the thread

coulpler (SM1T1) to baffle any external light

sources to see if this improves the response.

Si Switchable Gain Detector Chapter 6: Specifications

Rev D, April 21, 2020 Page 7

Chapter 6 Specifications

All performance specifications are typical, performed at 25 °C ambient

temperature, and assume a 50 Ω load, unless stated otherwise.

The PDA100A2 has a 50 Ω series terminator resistor (i.e. in series with amplifier output). This

forms a voltage divider with any load impedance (e.g. 50 Ω load divides signal in half).

Tested at 650 nm wavelength. For NIR wavelengths, the rise time of the photodiode element will

become slower which may limit the effective bandwidth of the amplified detector.

Performance Specifications2

0 dB Setting

40 dB Setting

Gain (Hi-Z)

1.51 x 103V/A ±2%

Gain (Hi-Z)

1.51 x 105V/A ±2%

Gain (50 Ω)

0.75 x 103V/A ±2%

Gain (50 Ω)

0.75 x 105V/A ±2%

Bandwidth3

11 MHz

Bandwidth3

90 kHz

Noise (RMS)

268 μV

Noise (RMS)

229 μV

NEP (@ p)

7.17 x 10-11 W/Hz

NEP (@ p)

2.67 x 10-12 W/Hz

Offset

±8 mV (Typ.)

±12 mV (Max)

Offset

±8 mV (Typ.)

±12 mV (Max)

10 dB Setting

50 dB Setting

Gain (Hi-Z)

4.75 x 103V/A ±2%

Gain (Hi-Z)

4.75 x 105V/A ±2%

Gain (50 Ω)

2.38 x 103V/A ±2%

Gain (50 Ω)

2.38 x 105V/A ±2%

Bandwidth3

1.4 MHz

Bandwidth3

28 kHz

Noise (RMS)

195 μV

Noise (RMS)

271 μV

NEP (@ p)

6.75 x 10-12 W/Hz

NEP (@ p)

4.2 x 10-12 W/Hz

Offset

±8 mV (Typ.)

±12 mV (Max)

Offset

±8 mV (Typ.)

±12 mV (Max)

20 dB Setting

60 dB Setting

Gain (Hi-Z)

1.5 x 104V/A ±2%

Gain (Hi-Z)

1.5 x 106V/A ±5%

Gain (50 Ω)

0.75 x 104V/A ±2%

Gain (50 Ω)

0.75 x 106V/A ±5%

Bandwidth3

800kHz

Bandwidth3

9 kHz

Noise (RMS)

219 μV

Noise (RMS)

423 μV

NEP (@ p)

3.36 x 10-12 W/Hz

NEP (@ p)

6.24 x 10-12 W/Hz

Offset

±8 mV (Typ.)

±12 mV (Max)

Offset

±8 mV (Typ.)

±12 mV (Max)

30 dB Setting

70 dB Setting

Gain (Hi-Z)

4.75 x 104V/A ±2%

Gain (Hi-Z)

4.75 x 106V/A ±5%

Gain (50 Ω)

2.38 x 104V/A ±2%

Gain (50 Ω)

2.38 x 106V/A ±5%

Bandwidth3

260 kHz

Bandwidth3

3 kHz

Noise (RMS)

222 μV

Noise (RMS)

1.22 mV

NEP (@ p)

2.83 x 10-12 W/Hz

NEP (@ p)

7.88 x 10-12 W/Hz

Offset

±8 mV (Typ.)

±12 mV (Max)

Offset

±8 mV (Typ.)

±12 mV (Max)

Si Switchable Gain Detector Chapter 6: Specifications

Page 8 TTN1134694-D02

Electrical Specifications

Detector

Active Area

Ø9.8 mm (75.4 mm2)

Wavelength Range

320 to 1100 nm

Peak Wavelength

λp

960 nm (Typ.)

Peak Response

( λ p)

0.72 A/W (Typ.)

Amplifier GBP

600 MHz

Output Impedance

50 Ω

Max Ouput Current

IOUT

100 mA

Load Impedance

50 Ωto Hi-Z

Gain Adjustment Range

0 to 70 dB

Gain Steps

8 x 10 dB Steps

Output Voltage

VOUT

0 to 5 V (50 Ω)

0 to 10 V (Hi-Z)

General

On/Off Switch

Slide

Gain Switch

8 Position Rotary

Output

BNC (DC Coupled)

Package Size

2.79" x 2.07" x 0.89"

(70.9 mm x 52.5 mm x 22.5 mm)

PD Surface Depth4

0.13" (3.3 mm)

Weight, Detector Only

0.10 kg

Accessories

SM1T1 Coupler

SM1RR Retainer Ring

Operating Temp

10 to 40 °C

Storage Temp

-20 to 70 °C

AC Power Supply

AC - DC Converter

Input Power5

6 W

100 V / 120 V / 230 V, 50 - 60 Hz

Measured from the front of the housing body.

Although the power supply is rated for 6 W, the detector’s actual usage is <5 W over the full

operating range.

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