AD8432

The AD8432's ultralow noise, low distortion, gain accuracy, and channel-to-channel matching are ideal for high performance ultrasound systems and for processing I/Q demodulator signals. The AD8432 operates on a single supply of 5 V at 24 mA. It is available in a 4 mm * 4 mm, 24-lead LFSCP. The operating temperature range is -40°C to +85°C. The AD8432 is a dual-channel, low power, ultralow noise amplifier with selectable gain and active impedance matching. The exceptional noise performance of the AD8432 is made possible by the active impedance matching. Using a feedback network, the input impedance of the amplifiers can be adjusted to match the signal source impedance without compromising the noise performance. Impedance matching and low noise in the AD8432 allow designers to create wider dynamic range systems that are able to detect even very low level signals. The AD8432 achieves 0.85 nV/Hz input-referred voltage noise for a gain of 12.04 dB. The LFCSP features an exposed paddle that provides a low thermal resistance path to the PCB, which enables more efficient heat transfer and increases reliability. Each channel has a single-ended input, differential output, and integrated input clamps. By pin strapping the gain setting pins, four accurate gains of G = 12.04 dB, 18.06 dB, 21.58 dB, and 24.08 dB (*4, *8, *12, and *16, respectively)are possible. A bandwidth of 200 MHz at G = 12.04 dB makes this amplifier well suited for many high speed applications.

The features of MAX7306 can be summarized as (1)low noise; (2)input voltage noise: 0.85 nV/Hz; (3)current noise: 2.0 pA/Hz; (4)high speed 200 MHz bandwidth (G = 12.04 dB)/ 295 V/s slew rate; (5)selectable gain G = 12.04 dB (*4)/ G = 18.06 dB (*8)/ G = 21.58 dB (*12)/ G = 24.08 dB (*16); (6)active input impedance matching; (7)integrated input clamp diodes; (8)single-ended input, differential output; (9)supply range: 4.5 V to 5.5 V; (10)low power: 60 mW/channel.

The absolute maximum ratings of MAX7306 are (1)voltage supply voltage: 5.5 V; (2)input voltage: 0 V to VP; (3)power dissipation: 120 mW; (4)operating temperature: 40°C to +85°C; (5)storage temperature: 65°c to +150°c; (6)package glass transition temperature (TG): 150°C; (7)lead temperature (Soldering, 60 sec): 300°C.