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參數(shù)資料
| 型號： | C2719 |
| 廠商： | Hamamatsu Photonics |
| 英文描述： | Photosensor amplifier |
| 中文描述： | 光敏放大器 |
| 文件頁數(shù)： | 2/6頁 |
| 文件大小： | 477K |
| 代理商： | C2719 |
Photosensor amplifier
C2719
LIGHT
330
Cf
1
+Vs
-Vs
ZERO ADJ
(CASE)
P
A
-
+
Rf
1
Rf
2
Rf
3
Cf
2
L
M
H
Vout = -(
i
× Rf)
PROTECTION CIRCUIT
A
K
+Vs
0 V
-Vs
+
006P (9 V)
×
2
EXTERNAL POWER
SUPPLY TERMINAL
+
Figure 1 Equivalent circuit (when photodiode cathode is grounded)
<Amplifier circuit>
KACCC0030EC
KACCC0031EA
I
Equivalent circuit
In the equivalent circuit diagram (Figure 1), the photocurrent sig-
nal
i
is connected to the input terminal of the negative feedback
amplifier A. The input resistance of A is designed to be much
larger than feedback resistance Rf, so all of
i
is flows through Rf.
The result is that the output voltage of A is converted to -
i
× Rf (V),
the reverse phase of
i
. Rf is switched to the High, Medium and Low
ranges by the conversion impedance, with Medium being 1/100
of High and Low being 1/10000 of High.
Feedback capacitance Cf is 10 pF (1 nF + 10 pF at Low range) to
prevent the circuit from becoming unstable at high frequencies.
In this case, the cut-off frequency is calculated as follows:
Rf
Cf
π
2
1
=
f
(Hz)
At this frequency, the output voltage is 0.7 times that at the low
frequency.
I
Pulsed light measurement
G
Output response waveform
If the photodiode terminal capacitance is approximately 2 nF or
more, ringing may appear in the output waveform of C2719
when pulsed light is detected, resulting in inaccurate measure-
ments. In this case, use a photodiode with a smaller terminal
capacitance, or add a reverse voltage to the photodiode to re-
duce the terminal capacitance.
Figures 2 (a) and (b) show pulse response waveforms when
used with S2281 photodiode which is designed to easily con-
nect to C2719. The terminal capacitance of S2281 is 1.28 nF.
G
Frequency response
Figure 3 shows the frequency response characteristics when
used with S2281. As stated above, if the photodiode terminal
capacitance is too large, a noticeable peak is formed in the fre-
quency characteristics. This situation is shown in Figure 4. A
frequency at which this kind of peak exists equals the reciprocal
of the ringing cycle generated in the pulse response output
waveform.
G
S/N
As explained above, when the terminal capacitance of a photo-
diode is too large, peaking exists in the noise characteristics
even when there is no light input, making it impossible to obtain
an accurate S/N during light measurement.
Figure 5 shows the frequency characteristics of the signal and
noise when S2281 is used. Here, peaking cannot be observed.
←
LED drive pulse waveform
(2 V/div.)
←
Output waveform
(2 V/div.)
←
LED drive pulse waveform
(2 V/div.)
←
Output waveform
(2 V/div.)
Figure 2 Output response waveform (S2281 + E2573)
(a) H range
(b) L, M range
2
<Power supply circuit>
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