Features

l High-speed response and high sensitivity

l Flat frequency characteristics

l Compact and lightweight

l Single power supply operation

Applications

l Laser radar

l Spatial light transmission

l Optical rangefinder

MODULE

APD module

Detects optical signals at 1 GHz, with high sensitivity

C5658

APD module C5658 is a highly sensitive photodetector consisting of a Si APD (avalanche photodiode), a bias power supply and a low-noise

amplifier, all integrated into a compact case. The APD used has an effective active area of

φ0.5 mm to allow efficient coupling to a light beam in

applications such as spatial light transmission. The APD internally multiplies the photocurrent to produce an ample gain (set to 100 times for

C5658) and also features high-speed response, achieving detection limits up to 1 GHz wideband and -48 dBm (16 nWr.m.s.) noise level in

combination with the low-noise amplifier. C5658 also incorporates a thermosensor and a temperature-compensated bias power supply necessary

for stable operation of the APD. Highly sensitive optical measurements can be made just by supplying +12 V to C5658.

s

Absolute maximum ratings

Parameter

Condition

Value

Unit

Supply voltage

+13.5

V

Maximum incident light level

Continuous input

10

mW

Operating temperature

0 to +50

°C

Storage temperature

-30 to +80

°C

s

Electrical and optical characteristics (Ta=25 °C, Vcc=12 V, output terminated with 50 Ω)

Parameter

Condition

Typ.

Unit

Spectral response range

400 to 1000

nm

Active area

φ0.5

mm

Quantum efficiency

λ=800 nm

70

%

High band

1

GHz

Cut-off frequency (-3 dB)

Low band

1

MHz

Detection sensitivity

λ=800 nm

V/W

Gain stability

25 °C ± 10 °C

±5.0

%

Noise level

Dark state

-48

dBm

Output impedance

50

Ω

VSWR *

1.5

-

Compression point at 1 dB

3

µW

* VSWR (Voltage Standing Wave Ratio)

If internal matching of elements on a signal transmission line (matching between element input/output impedance and signal line

impedance) is poor, signal reflections occur that generate standing waves on the signal line. The VSWR is the ratio of standing

wave maximum amplitude (V Max.) to minimum amplitude (V Min.) and indicates how well the impedance is internally matched.

When this internal matching is complete, no standing waves exit and the VSWR is 0 (zero).

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Signal connector

Parameter

Standard

Signal output

SMA

Power supply connector

D-sub 9 pin

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General specifications

Parameter

Condition

Value

Unit

Supply voltage

+12 ± 0.1

V

Current consumption

100

mA

Dimensional outline

Excluding projecting parts

28 × 50 × 60

mm

Weight

120

g