8-Bit, 40/80/100 MSPS
Dual A/D Converter
AD9288
FUNCTIONAL BLOCK DIAGRAM
FEATURES
V
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
DD
AD9288
ENC
TIMING
A
A
A
A
A
8
8
IN
T/H
D7 –D0
A A
ADC
IN
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
SELECT 1
SELECT 2
REF
REF
A
IN
REF
ADC
OUT
REF
B
IN
DATA FORMAT
SELECT
A
A
B
B
8
8
Pin-compatible 10-bit upgrade available
IN
T/H
D7 –D0
B
B
IN
APPLICATIONS
ENC
TIMING
B
Battery-powered instruments
Hand-held scopemeters
Low cost digital oscilloscopes
I and Q communications
V
GND
V
DD
D
Figure 1.
GENERAL DESCRIPTION
The AD9288 is a dual 8-bit monolithic sampling analog-to-
digital 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 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.
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.
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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