DC961B

DC961B is a demonstration circuit featuring an LT®1994, low noise, low distortion, fully differential amplifier. The LT1994 is a high precision, very low noise, low distortion, fully differential input/output amplifier. The LT1994’s output common mode voltage is independent of the input common mode voltage, and is adjustable by applying a voltage on the VOCM pin. The DC961 board contains an LT1994 amplifier configured as a unity gain differential amplifier with 499ohm feedback and input resistors. Gains greater than one require changing the input resistors to a value lower than 499ohm. In addition, DC961 has surface mount pads and traces for resistors and capacitors for building first and second order fully differential filter circuits. The differential outputs of DC961 can be configured with a first order RC network for driving the differential inputs of an analogue-to-digital converter (ADC).

• Connection to the differential input and output of a DC961 is through SMA connectors
• Onboard jumpers configure the DC961 for dual or single power supply operation
• DC961 differential input is AC coupled w/ 1µF capacitors for ease use as dual/single supply circuit
• 3nV/RTHz differential input referred voltage noise density
• 99dBc 2nd harmonic distortion, 2VP-P differential input, VS = 3V, fIN = 1MHz, RLOAD = 800 ohm
• 96dBc 3rd harmonic distortion, 2VP-P differential input, VS = 3V, fIN = 1MHz, RLOAD = 800 ohm