Datasheet

AMPLIFIER MODULES
M7279, M8879
The M7279 and M8879 are non-inverting amplifier modules,
specifically designed for photodetectors such as photomultiplier tubes. These amplifier modules work with either a current or voltage input, allowing direct connection to a photomultiplier tube or other photodetectors. The M7279 is comprised 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 external 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
SPECIFICATIONS
MAXIMUM RATINGS (Absolute Maximum Values)
Parameter
Power Supply Voltage (±Vs)
Operating Temperature Range
Storage Temperature Range
Signal Input Voltage
Lead Soldering Temperature (Less than 5 s)
M8879
±6.5
0 to +40
-15 to +60
Unit
V
°C
°C
V
°C
M7279
100
DC to 10
M8879
80
DC to 150
Unit
—
MHz
10
4
mV/µA
M7279
±7
-20 to +55
-30 to +85
±Vs
+280
CHARACTERISTlCS (at 25 °C, ±Vs = ±5 V)
Parameter
Load Resistance: 50 Ω
Voltage Gain
Frequency Bandwidth (-3 dB) See Figure 1, 2
Current-to-Voltage
Load Resistance: 50 Ω
Conversion Factor
Input Polarity
Amplifying Method
Input Impedance
Output Impedance
Load Resistance: 50 Ω
Min.
Maximum Output Voltage
Load Resistance: 1 MΩ
Min.
Load Resistance: 50 Ω
Typ.
Output Noise Voltage
Operating Temperature Range
Temperature Coefficient of
Output Offset Voltage
Load Resistance: 50 Ω
Recommended Supply Voltage
Power Supply Voltage
Power Supply Current
Max.
Weight
±1.5
±3.5
1.0
±1.4
±3
2.8
—
—
Ω
Ω
V
V
mVrms
±0.3
±0.2
mV/°C
±5 to ±6.5
45
1.1
±5 to ±6
61
2.5
V
mA
g
Positive / Negative
Non-inverting Output
100
50
50
Subject to local technical requirements and regulations, availability of products included in this promotional material may vary. Please consult with our sales office.
Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions. Specifications are
subject to change without notice. No patent rights are granted to any of the circuits described herein. ©2010 Hamamatsu Photonics K.K.
AMPLIFIER MODULES M7279, M8879
●Typical Frequency Response
Figure 1: M7279
Figure 2: M8879
RELATIVE GAIN (1 dB/Div.)
TACCB0063EB
RELATIVE GAIN (1 dB/Div.)
TACCB0057EA
0.1
1
10
1
100
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
●Dimensional Outline and Pin Configuration (Unit: mm)
Figure 3: M7279
Figure 4: M8879
R3
WHITE
DOT
(PIN#1)
12.6 ± 0.2
.5
0.3
R1
1.15
5
6
7
8
FUNCTION
INPUT
-Vs
INTERNAL CONNECTION
(DO NOT USE)
OPTION
(SEE "HOW TO USE" SECTION)
GND
OUTPUT
+Vs
TACCA0183ED
White dot mark is located on the character printed side to
show the orientation of pin#1.
2.54
3
0.5
PIN#
1
2
3
4
METAL CASE
8
0.5
2.1
HAMAMATSU
M7279
20.0 ± 0.2
7.5 ± 0.2
2.54
3.5 ± 0.8
3
10.4 ± 0.8
15.0 ± 0.8
21.0 ± 0.8
10.16
2.54
SILICONE PADS
2.54
2.54
2.54
+Vs 5
GND 4
-Vs 3
INPUT 2
6 OPTION PIN A
7 OPTION PIN B (SEE "HOW TO USE" SECTION)
8 OPTION PIN C
9 OUTPUT
1
GND
!0
GND
TACCA0249EA
HOW TO USE
●M7279
(A)
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.
(B)
COUPLING
CAPACITOR
200 kΩ
OUTPUT
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.
-Vs
VR
(10 kΩ to 20 kΩ)
+Vs
TACCC0109EA
Variation of gain and frequency response
RELATIVE GAIN (5 dB/Div.)
GAIN INCREASING
(1) WITHOUT RESISTOR
(2) 150 Ω RESISTOR
BETWEEN PINS #5 AND #6
(2)
(1)
* 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.
0.1
1
10
Re >
= 150 Ω
100
FREQUENCY (MHz)
TACCB0058EA
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.
INPUT
TACCC0111EA
AMPLIFIER MODULES M7279, M8879
HOW TO USE
●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 option 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 connection 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 impedance.
• 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 disconnecting condition when not used.
(A)
(B)
678
9
COUPLING
CAPACITOR
OUTPUT
OFFSET VR
10 kΩ
(TOP VIEW)
TACCC0118EA
INPUT
2
(TOP VIEW)
TACCC0119EA
CAUTION
If the supply voltage exceeds the maximum rating or is misconnected,
the amplifier modules may be damaged or overheat.
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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
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TACC1044E01
MAR. 2010. IP
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