1 UDT Sensors Inc. Phone: 310-978-0516 Fax: 310-644-1727 http:\\www.udt.com
PHOTOPSTM
PHOTODIODE-AMPLIFIER HYBRIDS
The Photop Series, combines a photodiode with an operational amplifier in
the same package. Photops general-purpose detectors have a spectral range
from either 350 nm to 1 100 nm or 200 nm to 1100nm. They have an integrated
package ensuring low noise output under a variety of operating conditions.
These op-amps are specifically selected by UDT Sensors engineers for com-
patibility to our photodiodes.
Among many of these specific parameters are low noise, low drift and capabil-
ity of supporting a variety of gains and bandwidths determined by the external
feedback components. Operation from DC level to several MHz is possible in
• General Purpose Light Detection • Detector/Amplifier Combined
• Laser Power Monitoring • Adjustable Gain/Bandwidth
• Medical Analysis • Low Noise
• Laser Communications • W ide Bandwidth
• Bar Code Readers • DIP Package
• Industrial Control Sensors • Large Active Area
• Pollution Monitoring
• Guidance Systems
• Colorimeter
APPLICATIONS FEATURES
an either unbiased configuration for low speed, low drift applications or biased
for faster response time.
Any modification of the above devices is possible. The modifications can
be simply adding a bandpass optical filter, integration of additional chip
(hybrid) components inside the same package, utilizing a different op-
amp, photodetector replacement, modified package design and / or mount
on PCB or ceramic. For your specific requirements, contact one of our
Applications Engineers.
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Responsivity (A/W)
200 300 400 500 600 700 800 900 1000 1100
Wavelength (nm)
Typical Spectral Respons
e
Standard
UV Enhanced
-6
-5
-4
-3
-2
-1
0
Gain (dB)
0.01 0.1 1 10
Frequency (MHz)
Typical Gain vs Frequency
455LN 455HS
455
Rf = 10 k
1
10
100
1000
10000
Responsivity (kV/W)
0.001 0.01 0.1 1 10
Frequency (MHz)
Ty p ical Re spon sivity vs Frequen c y
Rf= 10K
Rf = 100K
Rf= 1M
Rf= 10M
UDT - 455, 970 nm
2
UDT Sensors Inc. Phone: 310-978-0516 Fax: 310-644-1727 http:\\www.udt.com
PHOTOPSTM PHOTODIODE SPECIFICATIONSTYPICAL ELECTRO-OPTICAL SPECIFICATIONS AT TA=23OC
Active
Area Responsivity
(A/W) Capacitance
(pF) Dark
Current
(nA)
Shunt
Resistance
(M-ohm )
NEP
(W/Ö Hz)Temp
Range
(ºC)
200 nm 970 nm 0 V -10 V -10 V -10 mV 0 V
200 nm -10V
970 nm
Reverse
Voltage
(V)
Model
No.
Area (mm 2)
Dimension (mm)
Min
typ
min
typ
typ
typ
typ
max
typ
typ
typ
max
Operating
Storage
Package
Style ¶
350-1100 nm Spectral Range
UDT-451 28/ DIP
UDT-455
UDT-455LN
UDT-455HS
5.1
2.54f 85 15 .25 3 1.4 e- 14 29 / TO-5
UDT-020D
16
4.57f 330 60 .5 10 1.9 e- 14 30 / TO-8
UDT-555D
100
11.3 f
.60 .65
1500 300 2 25 3.9 e -14
30
31 / Special
200-1100 nm Spectral Range
UDT-455UV
UDT-455UV/LN 5.1
2.54f 300 100 9.2 e -14 29 / TO-5
UDT-020UV
16
4.57f 1000 50 1.3 e -13 30 / TO-8
UDT-055UV
50
7.98f 2500 20 2.1 e -13 31 / Special
UDT-555UV
UDT-555UV/LN 100
11.3f
.10 .14
4500 10 2.9 e -13
5
0 ~ +70
-30 ~ +100
31 / Special
O
PERATIONAL
A
MPLIFIER
S
PECIFICATIONS
T
YPICAL
E
LECTRO
-O
PTICAL
S
PECIFICATIONS AT
T
A
=23 ºC
Quiescent
Supply
Current
(mA)
Input Noise
Voltage
(nV/Ö Hz)
Input
Noise
Current
(fA/Ö Hz)
Supply
Voltage
(V)
± 15 V
Input
Offset
Voltage
(mV)
Temp
Coefficient
Input
Offset
Voltage
(µV / ºC)
Input B ias
Current
(pA)
Gain
Bandwidth
Product
(MHz)
Slew Rate
(V /µs)Open Loop
Gain, D C
(V / mV)
100
Hz 1 kHz 1
kHz
Model
No.
min
typ
max
typ
max
typ
max
typ
max
typ
max
min
typ
min
typ
min
typ
typ
typ
typ
UDT-451 --- ±15 ±18 1.4 2.5 3.0 6.0 10 --- 30 200 --- 4.0 --- 13 50 150 --- 18 10
UDT-455
UDT-455UV
UDT-020D
UDT-020UV
--- ±15 ±18 2.8 5.0 0.5 3 4 30 ±80 ±400 3.0 5.4 5 9 50 200 20 15 10
UDT-455HS --- ±15 ±18 4.8 8.0 0.5 3 4 30 ±80 ±500 11 26 25 40 50 200 20 15 10
UDT-455LN
UDT-455UV/LN ±5 ±15 ±18 0.9 1.8 .26 1 --- 20 .15 0.3 0.5 1 0.5 3 50 2500 78 27 0.22
UDT-055UV
UDT-555D
UDT-555UV
--- ±15 ±22 2.7 4.0 0.4 1 3 10 ±40 ±200 3.5 5.7 7.5 11 75 220 20 15 10
UDT-555UV/LN ±5 ±15 ±18 2.5 3.5 .05 0.25 0.5 1 0.5 1 --- 2 1 2 1k 1770 11 7 0.4
For MECHANICAL DRAWINGS Click Here
3 UDT Sensors Inc. Phone: 310-978-0516 Fax: 310-644-1727 http:\\www.udt.com
SCHEMATIC DIAGRAMS
PHOTOPTM SERIES
The output voltage is proportional to the light intensity of the light and is given
by:
F
FPOUT Rx RP
x RIV
=
=
)(
FREQUENCY RESPONSE (PHOTODIODE /AMPLIFIER COMBINATION)
The frequency response of the photodiode / amplifier combination is deter-
mined by the characteristics of the photodetector , pre-amplifier as well as the
feedback resistor (RF) and feedback capacitor (CF). For a known gain, (RF),
the 3 dB frequency response of the detector / pre-amp combination is given by:
FF
dB RpC
f21
3=
However, the desired frequency response is limited by the Gain Bandwidth
Product (GBP) of the op-amp. In order to have a stable output, the values of
the RF and CF must be chosen such that the 3 dB frequency response of the
detector / pre-amp combination, be less than the maximum frequency of the
op-amp, i.e. f3dB fmax.
)(2
max AJFF CCCpRGBP
f++
=
where CA is the amplifier input capacitance.
In conclusion, an example for frequency response calculations, is given below .
For a gain of 108, an operating frequency of 100 Hz, and an op-amp with GBP
of 5 MHZ:
pF
Rp f
C
FdB
F9.15
21
3
==
Thus, for CF = 15.9 pF, CJ = 15 pF and CA = 7 pF, fmax is about 14.5 kHz.
Hence, the circuit is stable since f3dB fmax.
For more detailed application specific discussions and further reading, refer to
the APPLICATION NOTES INDEX in the catalog.
Note: The shaded boxes represent the Photop
(TM)
compo-
nents and their connections. The components outside the
boxes are typical recommended connections and com-
ponents.
UDT-020D, 020UV
Op-Amp
-
+
R
F
C
F
+15V
-15V
12
106
9
4 3
100K
11
0.1 F
0.1 F
PV
PC
5
8Case
Ground
Detector V
OUT
7
V
OUT
Op-Amp
-
+
R
F
C
F
+15V
-15V
7
1
3
8
2
6
0.1 F
0.1 F
PV
PC
5 4
100K
Detector
UDT-451, 455LN, 455UV/LN
UDT-555UV/LN
V
OUT
Op-Amp
-
+
R
F
C
F
+15V
-15V
7
438
21 5
100K
6
0.1 F
0.1 F
PV
PC
Detector
UDT-455 , 455HS
UDT-555, 555UV, 055UV
