3V Dual Analog-to-Digital Converter
Description
Data Sheet AD9218
10-Bit, 40/65/80/105 MSPS 3 V Dual Analog-to-Digital Converter
FEATURES
► 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
APPLICATIONS
► Battery-powered instruments ► Hand-held scopemeters ► Low cost digital oscilloscopes ► I and Q communications ► Ultrasound equipment
GENERAL DESCRIPTION
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.
Userselectable 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.
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
PRODUCT HIGHLIGHTS 1.
Low Power.
Only 275 mW power dissipation per channel at 105
MSPS.
Other speed grades proportionally scaled down while maintaining high ac performance.
2.
Pin Compatibility Upgrade.
Allows...
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