ANALOG DEVICES MAT14 Service Manual
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MAT14
TOP VIEW
(Not to Scale)
09045-001
Matched Monolithic Quad Transistor
FEATURES
Low offset voltage: 400 µV maximum
High current gain: 300 minimum
Excellent current gain match: 4% maximum
Low voltage noise density at 100 Hz, 1 mA
3 nV/
√Hz maximum
Excellent log conformance
Bulk resistance (r
Guaranteed matching for all transistors
APPLICATIONS
Low noise op amp front end
Current mirror and current sink/source
Low noise instrumentation amplifiers
Voltage controlled attenuators
Log amplifiers
GENERAL DESCRIPTION
The MAT14 is a quad monolithic NPN transistor that offers
excellent parametric matching for precision amplifier and
nonlinear circuit applications. Performance characteristics
of the MAT14 include high gain (300 minimum) over a wide
range of collector current, low noise (3 nV/√Hz maximum at
100 Hz, I
The MAT14 also features a low offset voltage of 100 µV typical
and tight current gain matching to within 4%. Each transistor of
the MAT14 is individually tested to data sheet specifications.
For matching parameters (offset voltage, input offset current,
and gain match), each of the dual transistor combinations are
= 1 mA), and excellent logarithmic conformance.
C
) = 0.6 Ω maximum
BE
MAT14
PIN CONFIGURATION
Figure 1.
verified to meet stated limits. Device performance is guaranteed
at an ambient temperature of 25°C and over the industrial temperature range.
The long-term stability of matching parameters is guaranteed
by the protection diodes across the base emitter junction of
each transistor. These diodes prevent degradation of beta and
matching characteristics due to reverse bias, base emitter current.
The superior logarithmic conformance and accurate matching
characteristics of the MAT14 make it an excellent choice for use
in log and antilog circuits. The MAT14 is an ideal choice in
applications where low noise and high gain are required.
Rev. A
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