APD modules
C12703 series
APD module integrated with peripheral circuits
1
www.hamamatsu.com
APD
Thermosensor
±12 V
BNC connector
Temperature monitor
Voltage
controller
High voltage
generator
+200 V +12 V
Low-noise current-to-voltage amplifier circuit
Selection guide
Type no.
Photosensitive area
(mm)
Photosensitivity
(V/W)
Frequency bandwidth
(Hz)
C12703
φ1.5
1.5 × 10
6
DC to 10 M
C12703-01
φ3.0
-1.5 × 10
8
DC to 100 k
Block diagram
KACCC0028EA
Evaluation of APD
Uses a high sensitivity APD
Two types of APDs with different photosensitive areas
(φ1.5 mm,
φ
3.0 mm) are provided.
Built-in temperature-compensated bias power supply.
The bias power supply is controlled with a thermosen-
sor to keep the APD gain constant. Gain variations are
typically held within ±2.5% at an ambient tempera-
ture of 25 ±10 °C. Ripple noise usually inherent to
high-voltage power supplies is also minimized.
On-board high sensitivity circuit optimized for APD
evaluation. An APD and a low-noise current-to-voltage
amplifier circuit are mounted on a compact PC board.
The current-to-voltage amplifi er circuit features a low-
noise confi guration allowing low-light-level detection.
Detects optical signals from fi xed light (DC light)
The C12703 detects optical signals from fi xed light (DC
light) to 10 MHz pulsed light making it well suited for bar
code readers and film scanners. The C12703-01 covers
a narrower bandwidth from fi xed light (DC light) to 100
kHz pulsed light, but provides an excellent NEP of 20 fW/
Hz
1/2
, in the room temperature, making it suitable for
fl uorescence measurement and particle counters where
low-light-level detection is essential.
Custom designed module with different dimensions
and specifi cations are available.
Fluorescence measurement
Bar code readers
Particle counters
Film scanners
Low price
Compact and lightweight
The board is no larger than a typical business card.
Features Applications
APD modules C12703 series
2
Structure / Absolute maximum ratings (Ta=25 °C)
Electrical and optical characteristics (Typ. Ta=25 °C, Vcc=± 12 V, unless otherwise noted)
Photoelectric section (APD)
High-speed amplifi er section
Type no. Condition
Power supply
Vs
(V)
Current
dissipation
±12 V
(mA)
Board
dimensions
Weight
Absolute maximum ratings
Positive
supply
voltage
Vp
Negative
supply
voltage
Vn
Maximum
incident
light level
Operating
temperature
Topr
Storage
temperature
Tstg
Min. Typ. Max.
Min.
Typ. Max.
(mm) (g) (V) (V) (mW) (°C) (°C)
C12703
+12 V
+11.4 +12 +12.6
-
+30 +45
80 × 50 × 22
38 +16 -16 10 0 to +60
-20
to
+70
-12 V
-11.4 -12 -12.6
-
-11 -16
C12703-01
+12 V
+11.4 +12 +12.6
-
+35 +45
-12 V
-11.4 -12 -12.6
-
-11 -16
Type no.
Spectral response
range
λ
Peak sensitivity
wavelength
λp
Photosensitivity
S
Temperature stability of gain*
1
25 °C ± 10 °C, M=30
(%)
=800 nm, Gain(M)=1
(nm) (nm) (A/W) Typ. Max.
C12703
400 to 1000 800 0.5 ±2.5 ±5
C12703-01
Type no.
Cutoff frequency
fc
-3 dB
(Hz)
Noise equivalent
power
NEP
f=10 MHz (C12703)
f=100 kHz (C12703-01)
λ=800 nm
(pW/Hz
1/2
)F
Feed-
back
resis-
tance
(Ω)
Photoelectric
sensitivity*
1
Including APD
λ=800 nm
M=30
(V/W)
Maximum
input light
level
Minimum
detection limit
(W) (nW rms)High band Low band
Min. Typ.
Max. Min. Typ. Max.
Min. Typ. Max. Min. Typ. Max.
Min. Typ.
Max.
Min. Typ. Max.
C12703 9 M 10 M - -
DC -
- 0.2 0.4 10 k
1.4 × 10
6
1.5 × 10
6
1.6 × 10
6
5.0 6.0
--
0.63 1.26
C12703-01
80 k 100 k - -
DC -
- 0.02 0.04 10 M
-1.4 × 10
8
-1.5 × 10
8
-1.6 × 10
8
0.05 0.06 - - 0.0063 0.013
*
1: Gain is set to 30 at the factory prior to shipping.
Spectral response
Wavelength (nm)
Photosensitivity (A/W)
(Typ. Ta=25 °C, λ=800 nm, M=30)
200 400 600 800 1000300 500 700 900 1100
0
20
10
KACCB0013EA KACCB0020EB
Gain temperature characteristics
0
-30
10 20 30 40 50 60
Ambient temperature (°C)
Gain variation (%)
-20
-10
0
10
20
30
(M=30)
Typ.