MAXIMUM RATINGS (Absolute Maximum Values)
CHARACTERISTlCS (at 25 °C, ±Vs = ±5 V)
AMPLIFIER MODULES
M7279, M8879
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subject to change without notice. No patent rights are granted to any of the circuits described herein. ©2010 Hamamatsu Photonics K.K.
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M7279
±Vs
+280
±7
-20 to +55
-30 to +85
±6.5
0 to +40
-15 to +60
V
°C
°C
V
°C
UnitParameter
Power Supply Voltage (±Vs)
Operating Temperature Range
Storage Temperature Range
Signal Input Voltage
Lead Soldering Temperature (Less than 5 s)
M7279
M8879
M8879 Unit
—
MHz
mV/µA
—
—
Ω
Ω
V
V
mVrms
mV/°C
V
mA
g
Positive / Negative
Non-inverting Output
50
100
DC to 10
10
100
±1.5
±3.5
1.0
±0.3
±5 to ±6.5
45
1.1
80
DC to 150
4
50
±1.4
±3
2.8
±0.2
±5 to ±6
61
2.5
Load Resistance: 50 Ω
See Figure 1, 2
Load Resistance: 50 Ω
Load Resistance: 50 Ω
Load Resistance: 1 MΩ
Load Resistance: 50 Ω
Operating Temperature Range
Load Resistance: 50 Ω
Recommended Supply Voltage
Min.
Min.
Ty p.
Max.
Parameter
Voltage Gain
Frequency Bandwidth (-3 dB)
Current-to-Voltage
Conversion Factor
Input Polarity
Amplifying Method
Input Impedance
Output Impedance
Maximum Output Voltage
Output Noise Voltage
Temperature Coefficient of
Output Offset Voltage
Power Supply Voltage
Power Supply Current
Weight
SPECIFICATIONS
The M7279 and M8879 are non-inverting amplifier modules,
specifically designed for photodetectors such as photomulti-
plier tubes. These amplifier modules work with either a cur-
rent or voltage input, allowing direct connection to a photo-
multiplier tube or other photodetectors. The M7279 is com-
prised of an 8-pin SIP (single inline package) type hybrid IC
with protective epoxy resin and the M8879 is a 10-pin hybrid
IC to allow a compact mounting size on PC board. The offset
voltage and gain are easily adjusted by connecting an exter-
nal variable resistor.
FEATURES
●Non-inverting Amplifier Modules
●Frequency Bandwidth
M7279: DC to 10 MHz
M8879: DC to 150 MHz
●Compact Size
●Current-to-Voltage Conversion Factor
M7279: 10 mV/µA
M8879: 4 mV/µA
AMPLIFIER MODULES M7279, M8879
Figure 1: M7279
●Typical Frequency Response
Figure 3: M7279 Figure 4: M8879
●Dimensional Outline and Pin Configuration (Unit: mm)
TACCB0057EA
FREQUENCY (MHz)
RELATIVE GAIN (1 dB/Div.)
0.1 1 10 100
Figure 2: M8879
TACCB0063EB
TACCA0183ED TACCA0249EA
White dot mark is located on the character printed side to
show the orientation of pin#1.
HAMAMATSU
M7279
21.0 ± 0.8 3.5 ± 0.8
3
0.5
1.15
0.32.54
10.4 ± 0.8
15.0 ± 0.8
WHITE
DOT
(PIN#1)
1
2
3
4
5
6
7
8
PIN#
INPUT
-Vs
INTERNAL CONNECTION
(DO NOT USE)
OPTION
(SEE "HOW TO USE" SECTION)
GND
OUTPUT
+Vs
FUNCTION
FREQUENCY (MHz)
RELATIVE GAIN (1 dB/Div.)
1 10 100 1000
83
2.54 2.54
2.54
2.54
0.5
2.5410.16
2.1
7.5 ± 0.2 12.6 ± 0.2
20.0 ± 0.2
R1.5
R3
METAL CASE
SILICONE PADS
6
7
8
9
OPTION PIN A
OPTION PIN B
OPTION PIN C
OUTPUT
(SEE "HOW TO USE" SECTION)
5
4
3
2
+Vs
GND
-Vs
INPUT
1
GND
!0
GND
To adjust the offset voltage:
The DC offset voltage level varies with the ambient temperature and the internal
impedance of the signal lines. To adjust this offset voltage level, externally connect a
variable resistor across the option lead pins as shown in figure (A) on the right.
If a capacitor is connected to pin 7 as shown in figure (B) on the right, this acts as AC
coupling and eliminates the offset voltage.
PC board layout
When designing the PC board layout for mounting the M7279, the input signal line (pin 1) must be kept as short as possible to avoid
impairing the high-speed response.
Do not connect the supply voltage (±Vs) to pins 1, 3, 4, 5 and 7.
Use a wide area for ground.
Connect external bypass capacitors between the power supply lines (±Vs) and ground, and keep the wiring as short as possible.
The output impedance of the M7279 is 50 Ω. Make sure the signal output line matches the 50 Ω impedance.
When mounting the M7279 on a PC board, directly insert the pins into the terminal holes on the PC board without using any socket.
We recommend connecting diodes to pin 1 as shown below for over-current protection.
Don't connect any of option pins to anywhere in circuit unless using the option. Keep on disconnecting condition when not used.
To adjust the gain:
To adjust the gain of the M7279, externally connect a resistor (Re) across pins 5 and
6 as shown in the figure below. Use a resistor of 150 Ω or more. The M7279 can be
used at a gain between (1) and (2) shown in the gain graph. TACCC0109EA
TACCC0111EA
TACCB0058EA
Re 150 Ω
>
=
GAIN INCREASING
Variation of gain and frequency response
FREQUENCY (MHz)
RELATIVE GAIN (5 dB/Div.)
0.1 1 10 100
(2)
(1)
(10 kΩ to 20 kΩ)
VR
(A) (B)
-Vs +Vs
COUPLING
CAPACITOR
OUTPUT
200 kΩ
WITHOUT RESISTOR
150 Ω RESISTOR
BETWEEN PINS #5 AND #6
(1)
(2)
* The output offset voltage also changes when
Re is connected to the M7279. Adjust the
offsett voltage by referring to the offsett voltage
adjustment method explained above.
INPUT
●M7279
HOW TO USE
TACC1044E01
MAR. 2010. IP
AMPLIFIER MODULES M7279, M8879
HAMAMATSU PHOTONICS K.K., Electron Tube Division
314-5, Shimokanzo, Iwata City, Shizuoka Pref., 438-0193, Japan, Telephone: (81)539/62-5248, Fax: (81)539/62-2205
U.S.A.:
Hamamatsu Corporation: 360 Foothill Road, P. O. Box 6910, Bridgewater. N.J. 08807-0910, U.S.A., Telephone: (1)908-231-0960, Fax: (1)908-231-1218 E-mail: usa@hamamatsu.com
Germany:
Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49)8152-375-0, Fax: (49)8152-2658 E-mail: info@hamamatsu.de
France:
Hamamatsu Photonics France S.A.R.L.: 19, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: (33)1 69 53 71 00, Fax: (33)1 69 53 71 10 E-mail: infos@hamamatsu.fr
United Kingdom:
Hamamatsu Photonics UK Limited: 2 Howard Court, 10 Tewin Road Welwyn Garden City Hertfordshire AL7 1BW, United Kingdom, Telephone: 44-(0)1707-294888, Fax: 44(0)1707-325777 E-mail: info@hamamatsu.co.uk
North Europe:
Hamamatsu Photonics Norden AB: Smidesvägen 12, SE-171-41 SOLNA, Sweden, Telephone: (46)8-509-031-00, Fax: (46)8-509-031-01 E-mail: info@hamamatsu.se
Italy:
Hamamatsu Photonics Italia: S.R.L.: Strada della Moia, 1/E, 20020 Arese, (Milano), Italy, Telephone: (39)02-935 81 733, Fax: (39)02-935 81 741 E-mail: info@hamamatsu.it
WEB SITE www.hamamatsu.com
CAUTION
If the supply voltage exceeds the maximum rating or is misconnected,
the amplifier modules may be damaged or overheat.
●M8879
To adjust the offset voltage:
The DC offset voltage level varies with the ambient temperature and the internal impedance of the
signal lines. To adjust this offset voltage level, externally connect a variable resistor across the op-
tion lead pins as shown in figure (A) on the right.
If a capacitor is connected to pin 9 as shown in figure (B) on the right, this acts as AC coupling and
eliminates the offset voltage.
PC board layout
When designing a PC board layout for mounting the M8879, it is recommended to follow below
suggestion in order to maintain its high-speed response.
• The pattern for input signal line and output signal line should not be longer than 7 mm and con-
nection should be made with coaxial cable.
(The characteristic impedance of coaxial cable should be 50 Ω and the length of core cable
should be as short as possible.)
Use a cable clamp or a cable crimp type connector to a coaxial (cable).
• All of pins from the M8879 should be connected on a PC Board.
• Do not connect the supply voltage (±Vs) to the pins 2, 6, 7, 8 and 9.
• Use a wide area for ground.
• Connect external bypass capacitors between the power supply lines (±Vs) and ground, and keep
the wiring as short as possible.
• The output impedance of the M8879 is 50 Ω. Make sure the signal output line matches 50 Ω im-
pedance.
• When mounting the M8879 on a PC board, directly insert the pins into the terminal holes on the
PC board without using any socket. We recommend connecting diodes to pin 2 as shown on the
right for over-current protection.
• Don't connect any of option pins to anywhere in circuit unless using the option. Keep on discon-
necting condition when not used.
TACCC0118EA
TACCC0119EA
(A) (B)
(TOP VIEW)
678 9
OFFSET VR
10 kΩ
OUTPUT
COUPLING
CAPACITOR
(TOP VIEW)
2
INPUT
HOW TO USE
