LeCroy DA1822A Differential Amplifier, 10MHz

The LeCroy DA1822A is a 10 MHz differential amplifier that conditions low-level differential signals for measurement on single-ended instruments including oscilloscopes, network analyzers, and spectrum analyzers. It delivers selectable gain from 1 to 1000 with a built-in input attenuator, enabling sensitivity enhancement down to 2 µV/div and precise characterization of power delivery networks and high-current shunt resistor voltages.

Technical Specifications

• Bandwidth: DC to 10 MHz


• Gain Settings: 1, 10, 100, or 1000 (selectable)


• Input Attenuator: Selectable ÷1 or ÷10, yielding effective gains of 0.1, 1, 10, 100, or 1000


• Risetime: < 35 ns at ×1 or ×10 gain


• Maximum Output: ±5 V into 50 Ω load


• Output Impedance: 50 Ω


• Gain Accuracy: ±1% + termination resistance uncertainty


• Attenuator Accuracy: ±0.05%


• Maximum Differential Linear Input: 5 V


• Equivalent Input Noise Voltage: < 9 nV/√Hz broadband at ×10 gain


• DC Drift: 50 µV/°C at ×10 gain


• Common Mode Rejection Ratio: 100,000 to 1 (frequency-dependent)


• Input Resistance (÷1 Attenuator): 1 MΩ or 100 MΩ


• Input Resistance (÷10 Attenuator): 1 MΩ


• Input Capacitance (÷10 Attenuator): 20 pF


• Input Leakage Current (Attenuator): < 10 pA at 0–45°C


• Input Protection: ±250 V with automatic disconnect and manual reset


• Input Range (÷1 Attenuator): ±15.5 V


• Input Range (÷10 Attenuator): ±155 V

Key Features

• Built-in Precision Voltage Generator (PVG) with 5½-digit resolution


• PVG voltage range: ±15.5 V (±10 V in differential offset mode)


• PVG DC accuracy: 0.05% + 500 µV via temperature-controlled oven


• Digital control with individual digit increment/decrement


• Autozero function at 0.0 V selection and periodic intervals


• PVG output available externally via rear panel connector


• Configurable as differential comparator input or internal offset voltage source

Typical Applications

• Measuring voltages across high-current shunt resistors


• Power structure loss characterization


• Low-voltage differential signal conditioning for single-ended measurement instruments


• Extended oscilloscope sensitivity for microvolt-level measurements

Compatibility & Integration Front panel differential inputs accept standard signal sources. Amplifier output and PVG voltage are available via rear panel connectors for instrument integration and external applications.