10-Bit, 40/65/80/105 MSPS 3 V Dual Analog-to-Digital Converter

The AD9218 is a dual 10-bit monolithic sampling analog-to-digital converter with on-chip track-and-hold circuits. The product is low cost, low power, and is small and easy to use. The AD9218 operates at a 105 MSPS conversion rate with outstanding dynamic performance over its full operating range. Each channel can be operated independently.

The ADC requires only a single 3.0 V (2.7 V to 3.6 V) power supply and a clock for full operation. No external reference or driver components are required for many applications. The digital outputs are TTL/CMOS compatible and a separate output power supply pin supports interfacing with 3.3 V or 2.5 V logic.

The clock input is TTL/CMOS compatible and the 10-bit digital outputs can be operated from 3.0 V (2.5 V to 3.6 V) supplies. User-selectable options offer a combination of power-down modes, digital data formats, and digital data timing schemes. In power-down mode, the digital outputs are driven to a high impedance state.

Product Highlights

* Low Power. Only 275 mW power dissipation per channel at 105 MSPS. Other speed grades proportionally scaled down while maintaining high ac performance.

* Pin Compatibility Upgrade. Allows easy migration from 8-bit to 10-bit devices. Pin compatible with the 8-bit AD9288 dual ADC.

* Easy to Use. On-chip reference and user controls provide flexibility in system design.

* High Performance. Maintains 54 dB SNR at 105 MSPS with a Nyquist input.

* Channel Crosstalk. Very low at –75 dBc. 6. Fabricated on an Advanced CMOS Process. Available in a 48-lead low profile quad flat package (7 mm × 7 mm LQFP) specified over the industrial temperature range (−40°C to +85°C).

Applications

* Battery-powered instruments

* Hand-held scopemeters

* Low cost digital oscilloscopes

* I and Q communications

* Ultrasound equipment

* Dual 10-bit, 40 MSPS, 65 MSPS, 80 MSPS, and 105 MSPS ADC

* Low power: 275 mW at 105 MSPS per channel

* On-chip reference and track-and-hold

* 300 MHz analog bandwidth each channel

* SNR = 57 dB @ 41 MHz, Encode = 80 MSPS

* 1 V p-p or 2 V p-p analog input range each channel

* 3.0 V single-supply operation (2.7 V to 3.6 V)

* Power-down mode for single-channel operation

* Twos complement or offset binary output mode

* Output data alignment mode

* Pin compatible with the 8-bit AD9288

* –75 dBc crosstalk between channels