Analog Devices ADA4960-1 differential ADC driver

The ADA4960-1 is a differential amplifier optimised for RF and IF applications. It achieves better than 63 dB SFDR performance at frequencies up to 500 MHz and 52 dB up to 1 GHz, making it suitable for high-speed 8-bit to 10-bit giga-sample analog-to-digital converters.

The device has buffered inputs that isolate the gain-setting resistor from the signal inputs. As a result, it maintains a constant 10 kΩ differential input resistance for gains of 6 to 15 dB, easing matching and input drive requirements. It has a nominal 150 Ω differential output resistance.

The device is optimised for wideband, low-distortion performance at frequencies up to and beyond 1 GHz. These attributes, together with its wide gain adjust capability make it suitable for general-purpose IF and broadband applications where low distortion, noise and power are critical.

The device also includes a unity gain buffer, for buffering DC signals such as the common-mode-input to the amplifier. If the buffer is not used, the output can be left disconnected and the input can be grounded.

It is suitable for driving not only ADCs, but also mixers, pin diode attenuators, SAW filters and multi-element discrete devices, as well as buffering high-frequency DACs. The device is available in a single-channel version and operates over a temperature range of -40 to +85°C.