Transimpedance Amplifier Board - Digiboard

• versatile dual channel current to voltage converting amplifier
• one analog and one digital output
• wide single supply voltage range 5.0 V … 18.0 V with surge and polarity protection
• low power consumption ( < 50 mW @ 5 V )

  • Model Number: Digiboard
  • Data Sheet: Date Sheet File
Quantity:
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  • Transimpedance Amplifier Board
  • Transimpedance Amplifier Board
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Product Specification

Digiboard Transimpedance Amplifier Board Description
Most applications of photodiodes and especially those in the ultraviolet wavelength range require special  amplifiers  because  of  the  small photocurrents. Although the uv-sensors of sglux provide large active areas you mostly may consider using an amplifier.

To support your application development we provide you this completely new photodiode amplifier board. Based on our successful Multifunctional 2-Channel Amplifier Board we included additional features: one analog channel with adjustable Schmitt-Trigger (ST) and a Current-to-Frequency converter (CFC) channel.

The CFC clearly simplifies the integration of our photodiodes into digital- and microprocessor based designs.

Digiboard Transimpedance Amplifier Board Features
•  wide single supply voltage range 5.0 V … 18.0 V with surge and polarity protection
•  low power consumption ( < 50 mW @ 5 V )
•  analog transimpedance amplifier channel with:
   adjustable gain in the range 10 5 … 10 7 V/A with fine tuning option
   Schmitt-Trigger stage with adjustable switching point and adjustable Hysteresis
   LED for easy adjustment of the Schmitt-Trigger
•  Current-to-Frequency converter with:
   2 measurement ranges giving high dynamic range
   standard CMOS compatible digital output

Important Notice
Please consider any possible action to protect the sensitive devices on the board against electrostatic discharge (ESD). Not to do so voids warranty.

Digiboard Transimpedance Amplifier Board Absolute Maximum Ratings
Exceeding these limits may decrease lifetime or destroy the board or parts of it immediately.

Parameter
Unit
Value
Operation Temperature range * °C
0 … +70
Storage Temperature range *
°C
-25 … +85
Supply voltage
V
+18.5
Output current (digital output)
mA
0.5
Output current (analog output)
mA
10
*in non condensing environment only

Digiboard Transimpedance Amplifier Board Electrical Characteristics 
(at 25°C unless otherwise noted, default jumper settings)

General
Parameter
Unit
Value
min
typ
max
Supply voltage
V
5 12 18
Power dissipation
(at 5 V supply voltage, depends on load and switching frequency)
mW

50

Analog channel
Parameter
Unit
Value
min
typ
max
Fixed transimpedance gain  (gain setting by switches 3,4,5)




    low
V/A
0.98 x 105
105
1.02 x 105
    medium
0.98 x 106
106
1.02 x 106
    high
0.90 x 107
107
1.10 x 107
Variable transimpedance gain factor range*

0.7 - 1.3
0.5 - 1.5
0.3 - 1.7
Input current
A


□ 30 x 10-6
Maximum output voltage
(in both polarities)
V
□ 2.6 □ 2.9 □ 3.3
Output offset voltage
(with optimal compensation)
mV

5
□ 10
* if fine tuning selected by closing switches 6 and 7 total gain derived by multiplying fixed gain with variable gain factor

Digital channel
Parameter
Unit
Value
min
typ
max
Output voltage LOW*
V
0 0.05 0.1
Output voltage HIGH*
V
2.8 3.1 3.3
Frequency output pulse length FWHM
(levels above)
µs
1 1.2 2
Input current 
A
~ 10-10

~ 10-4
Conversion rate




   low frequency mode
Hz / A
2.8 x 108
3.0 x 108 3.2 x 108
   high frequency mode
3.1 109
3.3 x 109 3.5 x 109
Conversion rate temperature dependance
1 / K

3 x 10-5

Linearity error, high frequency mode




   @ 10 kHz
%

1
   @ 40 kHz

5.2
   @ 100 kHz

12
Linearity error, low frequency mode




   @ 10 kHz
%

1
   @ 40 kHz

5.5
   @ 100 kHz
13
* for the frequency output as well as for the Schmitt-Trigger output

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