Analog Devices SSM2220
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.
| Part No. |
SSM2220 |
| Datasheet |
SSM2220
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| Manufacturer |
 Analog Devices |
| Description |
Audio Dual Natched PNP transistor |
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FEATURES
Low voltage noise at 100 Hz, 1 nV/√Hz maximum High gain bandwidth: 190 MHz typical Gain at IC = 1 mA, 165 typical Tight gain matching: 3% maximum Outstanding logarithmic conformance: rBE = 0.3 Ω typical 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 SSM2220 TOP VIEW (Not to Scale) C1 1 B1 2 E1 3 NC 4 8 C2 7 B2 6 E2 5 NC 03096-001 NOTES 1. NC = NO CONNECT. THIS PIN IS NOT CONNECTED INTERNALLY. Figure 1. GENERAL DESCRIPTION
The SSM2220 also offers excellent matching of the current gain (ΔhFE) to about 0.5%, which helps to reduce the high order amplifier 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.
