APD modules
C12703 series
APD module integrated with peripheral circuits
www.hamamatsu.com
1
Selection guide
Type no.
Photosensitive area
(mm)
Photosensitivity
(V/W)
Frequency bandwidth
(Hz)
C12703 1.5 1.5 × 10
6
DC to 10 M
C12703-01 3.0 -1.5 × 10
8
DC to 100 k
APD
Thermosensor
±12 V
BNC connector
Temperature monitor
Voltage
controller
High voltage
generator
+200 V +12 V
Low-noise current-to-voltage amplifier circuit
Block diagram
KACCC0028EA
Features
Uses a high sensitivity APD
Two types of APDs with different photosensitive areas
(ϕ1.5 mm, ϕ3.0 mm) are provided.
On-board high sensitivity circuit optimized for APD
evaluation. An APD and a low-noise current-to-voltage
amplifi er 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 fixed 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.
Built-in temperature-compensated bias power supply.
The bias power supply is controlled with a thermosensor
to keep the APD gain constant. Gain variations are
typically held within ±2.5% at an ambient temperature of
25 ±10 °C. Ripple noise usually inherent to high-voltage
power supplies is also minimized.
Compact and lightweight
The board is no larger than a typical business card.
Low price
Custom designed module with different dimensions and
specifi cations are available.
Applications
Evaluation of APD
Fluorescence measurement
Bar code readers
Particle counters
Film scanners
APD modules C12703 series
2
Structure / Absolute maximum ratings (Ta=25 °C)
Type no.
Condition
Power supply
Vs
(V)
Current
dissipation
±12 V
(mA)
Board
dimensions
(mm)
Weight
(g)
Absolute maximum ratings
Positive
supply voltage
Vp
(V)
Negative
supply voltage
Vn
(V)
Maximum
incident
light level
(mW)
Operating
temperature
Topr
(°C)
Storage
temperature
Tstg
(°C)
Min. Typ. Max. Typ. Max.
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
Electrical and optical characteristics (Typ. Ta=25 °C, Vcc=± 12 V, unless otherwise noted)
Photoelectric section (APD)
Type no.
Spectral response
range
Peak sensitivity
wavelength
p
Photosensitivity
S
=800 nm, Gain(M)=1
Temperature stability of gain*
1
25 °C ± 10 °C, M=30
(%)
(nm) (nm) (A/W) Typ. Max.
C12703
400 to 1000 800 0.5 ±2.5 ±5
C12703-01
High-speed amplifi er section
Type no.
Cutoff frequency
fc
-3 dB
(Hz)
Noise equivalent power
NEP
f=10 MHz (C12703)
f=100 kHz (C12703-01)
=800 nm
(pW/Hz
1/2
)
Feedback
resistance
()
Latter-stage
amplifi er
gain
Photoelectric sensitivity*
1
Including APD
=800 nm
M=30
(V/W)
Maximum input
light level
(W)
Minimum
detection limit
(nW rms)High band
Low
band
Min. Typ. Typ. Max. Min. Typ. Max. Min. Typ. Typ. Max.
C12703 9 M 10 M DC 0.2 0.4 10 k -10 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.