942

NTE942
Integrated Circuit
Low Noise, Dual Preamp
Description:
The NTE942 is a dual preamplifier for the amplification of low level signals in applications requiring
optimum noise performance. Each of the two amplifiers is completely independent, with individual
internal power supply decoupler−regulator, providing 120dB supply rejection and 60dB channel separation. Other outstanding features include high gain (112dB), large output voltage swing (VCC
−2Vp−p), and wide power bandwidth (75kHz, 20Vp−p). The NTE942 operates from a single supply
across the wide range of 9 to 40V.
Either differential input or single ended input configurations may be selected. The amplifier is internally
compensated with the provision for additional external compensation for narrow band applications.
Features:
D Low Noise: .5µV Total Input Noise
D High Gain: 112dB Open Loop
D Single Supply Operation
D Wide Supply Range: 9−40V
D Power Supply Rejection: 120dB
D Large Output Voltage Swing (VCC −2VP−P)
D Wide Bandwidth 15MHz Unity Gain
D Power Bandwidth 75kHz, 20VP−P
D Internally Compensated
D Short Circuit Protected
Absolute Maximum Ratings:
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +40V
Power Dissipation (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 715mW
Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to +150°C
Lead Temperature (During Soldering, 10 sec max.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C
Note 1. For operation in ambient temperatures above +25°C, the device must be derated based on
+150°C maximum junction temperature and a thermal resistance of 175°C/W junction to
ambient.
Electrical Characteristics: (TA = +25°C, VCC = 14V, unless otherwise specified)
Parameter
Test Conditions
Voltage Gain
Open Loop (Differential Input), f = 100Hz
Supply Current
VCC = 9V to 40V, RL = ∞
Min
Input Resistance
Positive Input
Negative Input
Input Current, Negative Input
Output Resistance
Open Loop
Output Current
Source
Sink
Output Voltage Swing
Peak−to−Peak
Unity Gain Bandwidth
Typ
Max
160,000
Unit
V/V
−
10
−
mA
−
100
−
kΩ
−
200
−
kΩ
−
0.5
−
µA
−
150
−
Ω
−
8
−
mA
−
2
−
mA
−
VCC−2
−
V
−
15
−
MHz
Power Bandwidth
20VP−P (VCC = 24V)
−
75
−
kHz
Maximum Input Voltage
Linear Operation
−
−
300
mVrms
Supply Rejection ratio
f = 1kHz
−
60
−
dB
Channel Separation
f = 1kHz
−
60
−
dB
Total Harmonic Distortion
60dB Gain, f = 1kHz
−
0.1
−
%
Total Equivalent Input Noise
RS = 600Ω, 10 − 10,000Hz, (Single Ended
Input, Flat Gain Circuit, AV = 1000)
−
0.5
0.7
µVrms
Pin Connection Diagram
(+) Input 1 1
(−) Diff Input 1 2
(−) Input (S.E. *) 1 3
14 (+) Input 2
13 (−) Diff Input 2
12 (−) Input (S.E. *) 2
GND 4
11 Ext Comp 2
Ext Comp 1 5
10 Ext Comp 2
Ext Comp 1 6
9 VCC
Output 1 7
8 Output 2
*NOTE: Single Ended
14
8
1
7
.785 (19.95) Max
.300 (7.62)
.200
(5.08)
Max
.100 (2.45)
.600 (15.24)
.099 (2.5) Min
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