AD9288| Datasheet

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8-Bit, 40/80/100 MSPS Dual A/D Converter AD9288
FEATURES
Dual 8-bit, 40 MSPS, 80 MSPS, and 100 MSPS ADC Low power: 90 mW at 100 MSPS per channel On-chip reference and track-and-hold 475 MHz analog bandwidth each channel SNR = 47 dB @ 41 MHz 1 V p-p analog input range each channel Single 3.0 V supply operation (2.7 V to 3.6 V) Standby mode for single-channel operation Twos complement or offset binary output mode Output data alignment mode Pin-compatible 10-bit upgrade available

FUNCTIONAL BLOCK DIAGRAM
VDD

ENCA AINA AINA REFINA REFOUT REFINB AINB AINB

TIMING

OUTPUT REGISTER

AD9288
T/H ADC 8

D7A D0A SELECT 1 SELECT 2

REF

OUTPUT REGISTER

DATA FORMAT SELECT 8 D7B D0B

T/H

ADC

APPLICATIONS
Battery-powered instruments Hand-held scopemeters Low cost digital oscilloscopes I and Q communications

ENCB

TIMING

GND

VDD

Figure 1.

GENERAL DESCRIPTION
The AD9288 is a dual 8-bit monolithic sampling analog-todigital converter with on-chip track-and-hold circuits. It is optimized for low cost, low power, small size, and ease of use. The product operates at a 100 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 an Encode clock for full-performance 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 Encode input is TTL/CMOS-compatible, and the 8-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 standby modes, digital data formats, and digital data timing schemes. In standby mode, the digital outputs are driven to a high impedance state. Fabricated on an advanced CMOS
process, the AD9288 is available in a 48-lead surface-mount plastic package (7 mm 7 mm, 1.4 mm LQFP) specified over the industrial temperature range ( 40 C to +85 C). The AD9288 is pin-compatible with the 10-bit AD9218, facilitating future system migrations.

Rev. C
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00585-001