AD8260

Data Sheet High Current Driver Amplifier and Digital VGA/Preamplifier with 3 dB Steps AD8260 FEATURES High current driver Differential input—direct drive from DAC Preset gain: 1.5× −3 dB bandwidth: 195 MHz Large output drive: >±300 mA VGA/preamplifier Low noise Voltage noise: 2.4 nV/√Hz Current noise: 5 pA/√Hz −3 dB bandwidth: 230 MHz Gain range: 30 dB in 3 dB steps −6 dB to +24 dB (for preamplifier gain of 6 dB) Single-ended preamplifier input and differential VGA output Supplies: 3.3 V to 10 V (with VMID enabled) ±3.3 V to ±5 V (with VMID disabled) Power: 93 mW with 3.3 V supplies Power-down for VGA, driver amplifier, and system APPLICATIONS Digital AGC systems Tx/Rx signal processing Power line transceivers GENERAL DESCRIPTION The AD8260 includes a high current driver, usable as a transmitter, and a low noise digitally programmable variable gain amplifier (DGA), useable as a receiver. The receiver section consists of a single-ended input preamplifier, and linear-in-dB, differential-output DGA. The receiver has a small signal –3 dB bandwidth of 230 MHz; the driver small signal bandwidth is 195 MHz. The driver delivers ±300 mA, well suited for driving low impedance loads, even when connected to a 3.3 V supply. The AD8260 DGA is ideal for trim applications and has a gain span of 30 dB, in 3 dB steps. Excellent bandwidth uniformity is maintained across the entire frequency range. The low outputreferred noise of the DGA is advantageous in driving high speed ADCs. The differen...