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ZN459, ZN459CP
ADVANCE INFORMATION
DS3623 - 2.0
ULTRA LOW NOISE WIDEBAND PREAMPLIFIER
A versatile high grade a.c. pre-amplifier designed for
applications requiring ultra low noise such as infra-red
imaging and low noise wide band amplifiers e.g. microphone,
acoustic emission, transducer bridge amplifier. The matching
of open loop gain coupled with small physical size make the
ZN459 series ideal for multichannel amplification.
FEATURES
s High Controlled Gain : 60dB ±1dB typical
s Low Noise
: 40Equivalent Noise
Resistance, or 800pV/Hz
s Wide bandwidth
: 15MHz typical
s Low Supply Current : <3mA from 5V
ABSOLUTE MAXIMUM RATINGS
Supply voltage
Operating Temperature Range:
for ZN459
for ZN459CP
Storage Temperature Range
6 Volts
-55 to +125°C
0 to +70°C
-55 to +125°C
ZN459
ZN459CP
CM6
DP8
Fig.1 ZN459 Outline circuit

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ZN459
ELECTRICAL CHARACTERISTICS
Test condltions (unless otherwise stated):
(VCC = 5V, Tamb = 25°C)
Parameter
Min.
Typ.
Max.
Units
Conditions
Supply Current
Voltage Gain
TC of Voltage Gain
VCC Coefficient of Voltage Gain
Cut-off Frequency
Input Resistance
Input Capacitance
Noise Resistance
White Noise Voltage
L.F. Spot Noise
White Noise Current
Output Level
Supply Voltage Coefficient
of Output Level
Output Current Limit
Total Harmonic Distortion
Output Resistance
Supply Rejection Ratio
Delay Time
Delay Time
Positive Input Overdrive
Negative Input Overdrive
2.0 2.5 3.0 mA
59 60 61
dB 10KHz
-0.2 %/°C
25 %/V
15
MHz
3dB down
3.5 7
k10KHz
80 pF Note 1
40
R =0
S
800
1100
pV/HZ
R =0
S
3
nV/HZ
RS = 0, f = 25Hz
1 pA/HZ
1.5 2.0 2.5 V
0.34 V/V
0.6 0.8 1.1 mA Sink current
0.15 % 1 Vpp at 10KHz
75 10KHz
42.5 dB
20 ns Small signal
40 ns 100mV rms input
10 mA
-5 V
Note 1: In P.C.B. The input capacitance may be reduced to 25pF by screening between output and input.
Fig.2 Pinning configuration - ZN459
Fig.3 Pinning configuration - ZN459CP

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ZN459
Fig.4 Gain Test Circuit (ZN459)
The input impedance may be increased at the expense of
noise by including R1 to vary the gain (R1 = 0, gain = 103; R1 =
470, gain = 102).
C is required to decouple the internal feedback loop and in
d
order to obtain a flat frequency response make Cd > Cc.
The earth lead of the supply decoupling capacitor should be as
close as possible to that of R .
1
For optimum Common Mode Rejection connect a twisted pair
between source and pins 4 and 5 of the device and complete
the earth return from source ground.
Fig.5 ZN459 Input and output circuit

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ZN459
Fig.6 PCB layout (ZN459)
Fig.7 PCB layout (ZN459CP)

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TYPICAL CHARACTERISTICS
ZN459
Fig.8 Gain VS Frequency
Fig.9 Gain and noise resistance VS emitter resistance