1 Features

• Low Noise:
  • 2.9-pA/√Hz Noninverting Current Noise
  • 10.8-pA/√Hz Inverting Current Noise
  • 2.2-nV/√Hz Voltage Noise
  • 128-MHz , –3-dB BW (R_L = 50 Ω, R_F = 470 Ω)
  • 1550-V/µs Slew Rate (G = 2, R_L= 50Ω )
• High Output Current: 450 mA
• High Speed:
  • 128-MHz , –3-dB BW (R_L = 50 Ω, R_F = 470 Ω)
  • 1550-V/µs Slew Rate (G = 2, R_L= 50Ω )
  • 26-V_PP Output Voltage, R_L= 50 Ω
  • –80 dBc (1 MHz, 2 V_PP, G = 2)
• Wide Output Swing:
  • 26-V_PP Output Voltage, R_L= 50 Ω
  • –80 dBc (1 MHz, 2 V_PP, G = 2)
  • 370-µA Shutdown Supply Current
• Low Distortion:
  • –80 dBc (1 MHz, 2 V_PP, G = 2)
  • 370-µA Shutdown Supply Current
• Low-Power Shutdown Mode (THS3125)
  • 370-µA Shutdown Supply Current
• Standard SOIC, HSOP PowerPAD™, and HTSSOP PowerPAD Packages

2 Applications

• Video Distribution
• Instrumentation
• Line Drivers
• Motor Drivers
• Piezo Drivers

3 Description

The THS3122 and THS3125 are low-noise, high-speed current feedback amplifiers, with high output current drive. This makes them ideal for any application that requires low distortion over a wide frequency with heavy loads. The THS3122 and THS3125 can drive four serially-terminated video lines while maintaining a differential gain error less than 0.03%.

The high output drive capability of the THS3122 and THS3125 enables the devices to drive 50-Ω loads with low distortion over a wide range of output voltages:

• –80-dBc THD at 2 V_PP
• –75-dBc THD at 8 V_PP

The THS3122 and THS3125 operate from ±5-V to ±15-V supply voltages while drawing as little as 7.2 mA of supply current per channel. The THS3125 offers a low-power shutdown mode, reducing the supply current to only 370 µA. The THS3122 and THS3125 are packaged in SOIC, HSOP, and HTSSOP packages.

1. For all available packages, see the package option addendum at the end of the data sheet.

4 Revision History

Changes from D Revision (February 2011) to E Revision

• Added missing minus sign to temperature range in Available Options table Go
• Changed Input Offset parameter maximum values in Electrical Charateristics for DC PerformanceGo
• Added Detailed Description sectionGo
• Added Application and Implementation sectionGo
• Change Application Information sectionGo

Changes from C Revision (July 2010) to D Revision

• Changed output current (absolute maximum) from 275 mA to 550 mAGo

Changes from B Revision (October, 2009) to C Revision

• Corrected REF pin name for THS3125 shown in front-page figureGo
• Deleted Shutdown pin input levels parameters and specifications from Recommended Operating Conditions tableGo
• Updated Shutdown Characteristics table test conditions; changed GND to REF, corrected V_SHDN notationsGo
• Added V_REF and V_SHDN parameters and speciifications to Shutdown Characteristics tableGo
• Revised second and fourth paragraphs of Saving Power with Shutdown Functionality sectionGo
• Updated equation in Power-Down Reference Pin Operation section that describes usable range at the REF pinGo
• Revised paragraph in Power-Down Reference Pin Operation that discusses behavior of unterminated REF pinGo