Audio Dual Matched PNP Transistor

Data Sheet

SSM2220

Rev. C

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FEATURES

Low voltage noise at 100 Hz, 1 nV/√Hz maximum

High gain bandwidth: 190 MHz typical

Tight gain matching: 3% maximum

Low offset voltage: 200 μV maximum

APPLICATIONS

Microphone preamplifiers

Tape head preamplifiers

Current sources and mirrors

Low noise precision instrumentation

Voltage controlled amplifiers/multipliers

PIN CONNECTION DIAGRAM

NC

4

8

7

6

NC

5

SSM2220

TOP VIEW

(Not to Scale)

NOTES

1. NC = NO CONNECT. THIS PIN IS

NOT CONNECTED INTERNALLY.

Figure 1.

GENERAL DESCRIPTION

The SSM2220 is a dual, low noise, matched PNP transistor, which

has been optimized for use in audio applications.

The ultralow input voltage noise of the SSM2220 is typically only

0.7 nV/√Hz over the entire audio bandwidth of 20 Hz to 20 kHz.

The low noise, high bandwidth (190 MHz), and offset voltage of

(200 μV maximum) make the SSM2220 an ideal choice for demand

ing, low noise preamplifier applications.

The SSM2220 also offers excellent matching of the current gain

fier harmonic distortion. In addition, to ensure the long-term

stability of the matching parameters, internal protection diodes

across the base to emitter junction were used to clamp any reverse

base to emitter junction potential. This prevents a base to emitter

breakdown condition, which can result in degradation of gain and

matching performance due to excessive breakdown current.

Another feature of the SSM2220 is its very low bulk resistance

of 0.3 Ω typical, which assures accurate logarithmic conformance.

The SSM2220 is offered in 8-lead plastic dual inline (PDIP) and

8-lead standard small outline (SOIC), and its performance and

characteristics are guaranteed over the extended industrial temper-

ature range of −40°C to +85°C.