The AD9281 is a dual channel, 28 MSPS, 8-bit CMOS ADC from Analog Devices. It features low power dissipation, single supply, differential nonlinearity error of 0.1 LSB, and on-chip reference signal-to-noise ratio of 49.2 dB.
The AD9281 is a dual‑channel, 8‑bit CMOS ADC optimized for applications that require closely matched I and Q channels. It operates from a single supply of 2.7 V to 5.5 V, consumes low power (≈225 mW at 3 V), and integrates on‑chip analog input buffers and a band‑gap reference.
The document lists detailed electrical specifications, absolute maximum ratings, pin assignments, functional block diagrams, typical characteristic curves, and mechanical dimensions for the 28‑lead SSOP package. It also includes an ordering guide and evaluation board information.
| Resolution | 8 Bits |
|---|---|
| Conversion Rate | 28 MHz (typical) |
| Power Consumption | 225 mW (typical at 3 V) |
| Supply Voltage (AVDD/DVDD) | 2.7 V to 5.5 V |
| Input Voltage Range | -0.5 V to AVDD/2 V |
| Input Capacitance | 2 pF |
| Signal‑to‑Noise Ratio (typical) | 49.2 dB |
| Spurious‑Free Dynamic Range (typical) | -65 dB |
| Differential Nonlinearity (DNL) | +0.1 LSB |
| Integral Nonlinearity (INL) | ≤0.25 LSB |
| Package | 28‑lead SSOP (RS‑28) |
Typical power consumption is 225 mW at a 3 V supply.
Both analog and digital supplies can operate from 2.7 V to 5.5 V.
The AD9281 is a dual‑channel ADC, providing two independent 8‑bit converters.
The device can sample at up to 28 MSPS (28 MHz).