The AD8432 is a dual-channel ultralow noise amplifier with selectable gain and input impedance
The AD8432 is a dual‑channel, low‑power, ultralow‑noise amplifier with selectable gain and active input‑impedance matching. It offers four accurate gain settings, a 200 MHz bandwidth at the lowest gain, and low power consumption (60 mW per channel). The device is supplied from a single 5 V rail and operates from –40 °C to +85 °C.
The datasheet includes sections on features, applications, functional block diagram, detailed specifications, absolute maximum ratings, thermal resistance, pin configuration, typical performance characteristics, and an ordering guide with package options. It also provides test circuits, gain‑setting techniques, and evaluation board information.
| Gain Range | 12.04 dB to 24.08 dB |
|---|---|
| Small‑Signal Bandwidth (G = 12.04 dB) | 200 MHz |
| Slew Rate (Rising Edge) | 295 V/µs |
| Input Voltage Noise | 0.85 nV/√Hz |
| Input Current Noise | 2.0 pA/√Hz |
| Supply Voltage (Absolute Maximum) | 5.5 V |
| Operating Temperature Range | ‑40 °C to +85 °C |
| Power Dissipation | 120 mW |
The AD8432 operates from a single supply of 4.5 V to 5.5 V.
At a gain of 12.04 dB the input‑referred voltage noise is 0.85 nV/√Hz.
The AD8432 is rated for operation from –40 °C up to +85 °C.