THORLABS PDAPC2, User Manual, Page: 13 / 18

Si Switchable Gain Detector, OEM Chapter 6: Specifications
Rev B, June 15, 2021 Page 11
Chapter 6 Specifications
All performance specifications are typical, performed at 25 °C ambient
temperature, and assume a 50
Ω load, unless stated otherwise.
Performance Specifications
2
0 dB Setting 40 dB Setting
Gain (Hi-Z) 1.51 x 10
3
V/A ±2% Gain (Hi-Z) 1.51 x 10
5
V/A ±2%
Gain (50 Ω )
0.75 x 10 3 V/A ±2%
Gain (50 Ω )
0.75 x 10 5 V/A ±2%
Bandwidth 3 11 MHz Bandwidth 3 90 kHz
Noise (RMS)
268 μ V
Noise (RMS)
229 μ V
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 10
3
V/A ±2% Gain (Hi-Z) 4.75 x 10
5
V/A ±2%
Gain (50 Ω ) 2.38 x 10
3
V/A ±2% Gain (50 Ω ) 2.38 x 10
5
V/A ±2%
Bandwidth 3 1.4 MHz Bandwidth 3 28 kHz
Noise (RMS)
195 μ V
Noise (RMS)
271 μ V
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 10
4
V/A ±2% Gain (Hi-Z) 1.5 x 10
6
V/A ±5%
Gain (50 Ω )
0.75 x 10 4 V/A ±2%
Gain (50 Ω )
0.75 x 10 6 V/A ±5%
Bandwidth 3 800 kHz Bandwidth 3 9 kHz
Noise (RMS)
219 μ V
Noise (RMS)
423 μ V
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 10 4 V/A ±2% Gain (Hi-Z) 4.75 x 10 6 V/A ±5%
Gain (50 Ω ) 2.38 x 10
4
V/A ±2% Gain (50 Ω ) 2.38 x 10
6
V/A ±5%
Bandwidth 3 260 kHz Bandwidth 3 3 kHz
Noise (RMS) 222 μ V 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)
2 The PDAPC2 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).
3
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.