Overview
The SSM2212RZ, produced by Analog Devices Inc., is a dual, NPN-matched transistor pair specifically designed to meet the stringent requirements of ultralow noise audio systems. This component is renowned for its extremely low input base spreading resistance and high current gain, making it ideal for achieving outstanding signal-to-noise ratios. The SSM2212RZ is available in 8-lead SOIC and 16-lead LFCSP packages, ensuring versatility in various circuit designs.
Key Specifications
| Parameter | Symbol | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Current Gain | hFE | IC = 1 mA, VCB = 15 V | 300 | 1800 | 2400 | |
| Input Bias Current | IB | IC = 100 µA | 200 nA | nA | ||
| Input Offset Current | IOS | IC = 100 µA | 10 nA | nA | ||
| Output Capacitance | COB | VCB = 15 V, IE = 0 µA | 23 pF | pF | ||
| Collector-to-Collector Capacitance | CCC | VCC = 0 V | 35 pF | pF | ||
| Collector-Emitter Breakdown Voltage | VCEO | 40 V | V | |||
| Collector-Base Breakdown Voltage | VCBO | 40 V | V | |||
| Maximum DC Collector Current | 20 mA | mA | ||||
| Transition Frequency | fT | 200 MHz | MHz |
Key Features
- Very Low Voltage Noise: 1 nV/√Hz maximum at 100 Hz, ensuring minimal noise in audio systems.
- Excellent Current Gain Match: ΔhFE of approximately 0.5%, which is crucial for symmetrically balanced designs and reducing high-order amplifier harmonic distortion.
- Low Offset Voltage (VOS): Less than 10 μV typical, making it ideal for accurate and reliable current biasing and mirroring circuits.
- High Gain Bandwidth Product: 200 MHz, contributing to superior performance in high-frequency applications.
- Protection Diodes: Across the base-emitter junction to prevent degradation of beta and matching characteristics due to reverse biasing.
- Operating Temperature Range: Guaranteed performance over the extended temperature range of −40°C to +85°C.
Applications
- Ultralow Noise Audio Systems: The SSM2212RZ is specifically designed for high-fidelity audio applications where low noise and high signal-to-noise ratios are critical.
- Current Biasing and Mirroring Circuits: Its low VOS and excellent current gain match make it an ideal choice for accurate and reliable current biasing and mirroring circuits.
- Logarithmic Amplifiers: Can be used in fast logarithmic amplifier configurations, offering a wide dynamic range and fast response times.
- High-Frequency Amplifiers: Suitable for high-frequency applications due to its high gain bandwidth product and transition frequency).
Q & A
- What is the primary application of the SSM2212RZ?
The SSM2212RZ is primarily used in ultralow noise audio systems to achieve high signal-to-noise ratios).
- What is the typical current gain (hFE) of the SSM2212RZ?
The typical current gain (hFE) of the SSM2212RZ exceeds 600 at IC = 1 mA).
- What is the maximum DC collector current for the SSM2212RZ?
The maximum DC collector current for the SSM2212RZ is 20 mA).
- What is the collector-emitter breakdown voltage (VCEO) of the SSM2212RZ?
The collector-emitter breakdown voltage (VCEO) of the SSM2212RZ is 40 V).
- What is the transition frequency (fT) of the SSM2212RZ?
The transition frequency (fT) of the SSM2212RZ is 200 MHz).
- What package options are available for the SSM2212RZ?
The SSM2212RZ is available in 8-lead SOIC and 16-lead LFCSP packages).
- What is the operating temperature range for the SSM2212RZ?
The SSM2212RZ operates over the extended temperature range of −40°C to +85°C).
- Why is the SSM2212RZ suitable for current biasing and mirroring circuits?
The SSM2212RZ is suitable due to its low VOS and excellent current gain match, which ensure accurate and reliable operation in these circuits).
- How does the SSM2212RZ protect against degradation of beta and matching characteristics?
The SSM2212RZ includes protection diodes across the base-emitter junction to prevent degradation due to reverse biasing).
- What is the typical input bias current (IB) of the SSM2212RZ?
The typical input bias current (IB) of the SSM2212RZ is 200 nA at IC = 100 µA).
