The AD8324 is a low cost amplifier designed for coaxial line driving. The features and specifications make the AD8324 ideally suited for DOCSIS 2.0 and Euro-DOCSIS applications. The gain of the AD8324 is digitally controlled in 1 dB steps over a 59 dB range. Low distortion at 61 dBmV output: -59 dBc SFDR@21 MHz, -54 dBc SFDR@65 MHz. Output noise level @ minimum gain 1.3 nV/√Hz. Maintains 75 Ω output impedance in TX-enable and Transmit-disable condition. Upper bandwidth: 100 MHz (full gain range). Supports SPI® interfaces.
The AD8324 is a low‑cost 3.3 V cable line driver amplifier designed for DOCSIS 2.0, Euro‑DOCSIS and CATV applications. It provides programmable gain, low distortion, and a 75 Ω output impedance suitable for coaxial and twisted‑pair line driving. Key features include a 59 dB gain range programmable in 1 dB steps, up to 61 dBmV output power, 100 MHz bandwidth, and sleep‑mode power consumption as low as 30 pA. The device is offered in 20‑lead LFCSP and QSOP packages.
| Supply Voltage Range | 3.13 V – 3.47 V |
|---|---|
| Gain Range | 58 dB – 60 dB (1 dB steps) |
| Bandwidth (‑3 dB) | 100 MHz |
| Maximum Output Power | 61 dBmV |
| Quiescent Current (Max Gain) | 207 mA |
| Input Resistance (Single‑Ended) | 550 Ω |
| Output Impedance | 75 Ω (maintained in TX‑enable and TX‑disable) |
The AD8324 operates from a single 3.3 V supply with an allowed operating range of 3.13 V to 3.47 V.
Gain is digitally controlled by an 8‑bit serial word, giving 1 dB steps over a 59 dB range.
The device drives a 75 Ω load through a 1:1 transformer, maintaining a 75 Ω output impedance.
The AD8324 can deliver up to 61 dBmV output power.