SSM2142 Balance Line Driver

The SSM2142 is an integrated differential-output buffer amplifier that converts a single-ended input signal to a balanced output signal pair with high output drive. By utilizing low noise thermally matched thin film resistors and high slew rate amplifiers, the SSM2142 helps maintain the sonic quality of audio systems by eliminating power line hum, RF interference, voltage drops, and other externally generated noise commonly encountered with long audio cable runs. Excellent rejection of common-mode noise and offset errors is achieved by laser trimming of the onboard resistors, assuring high gain accuracy. The carefully designed output stage of the SSM2142 is capable of driving difficult loads, yielding low distortion performance despite extremely long cables or loads as low as 600 Ohm, and is stable over a wide range of operating conditions.

Based on a cross-coupled, electronically balanced topology, the SSM2142 mimics the performance of fully balanced transformer-based solutions for line driving. However, the SSM2142 maintains lower distortion and occupies much less board space than transformers while achieving comparable common-mode rejection performance with reduced parts count.

The SSM2142 in tandem with the SSM2141 differential receiver establishes a complete, reliable solution for driving and receiving audio signals over long cables. The SSM2141 features an Input Common-Mode Rejection Ratio of 100 dB at 60 Hz. Specifications demonstrating the performance of this typical system are included in the data sheet.

Features and Benefits
  • Transformer-Like Balanced Output
  • Drives 10 V RMS Into a 600 Ω Load
  • Stable When Driving Large Capacitive Loads and Long
    Cables
  • Low Distortion
    0.006% typ 20 Hz–20 kHz, 10 V RMS into 600 Ω
  • High Slew Rate
    15 V/µs typ
  • Low Gain Error
    (Differential or Single-Ended); 0.7% typ
  • Outputs Short-Circuit Protected
  • Available In Space-Saving 8-Pin Mini-DIP Package
  • Low Cost
Audio & Video Products
Data Sheets
Documentnote
SSM2142: Balanced Line Driver Data Sheet (Rev. C)PDF 227 kB
Application Notes
Documentnote
AN-938: Digital and Analog Measurement Units for Digital CMOS Microphone Preamplifier ASICs (Rev. 0)PDF 75 kB
AN-211: The Alexander Current-Feedback Audio Power AmplifierPDF 1154 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
SSM2142PZ Production8 ld PDIPOTH 50-40 to 85C2.922.65Y
SSM2142SZ Production16 ld SOIC - WideOTH 47-40 to 85C00Y
SSM2142SZ-REEL Production16 ld SOIC - WideREEL 1000-40 to 85C00Y
SSM2142: Balanced Line Driver Data Sheet (Rev. C) ssm2142
AN-938: 数字CMOS麦克风前置放大器ASIC的数字和模拟测量单位 (Rev. 0) ssm2166
AN-938: Digital and Analog Measurement Units for Digital CMOS Microphone Preamplifier ASICs (Rev. 0) ssm2166
AN-211: The Alexander Current-Feedback Audio Power Amplifier ad73311