AD9244 Datasheet, PDF (1/36 Pages) Analog Devices – 14-Bit, 40/65 MSPS Monolithic A/D Converter

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14-Bit, 40/65 MSPS A/D Converter
AD9244
FEATURES
14-Bit, 40/65 MSPS ADC
Low Power:
550 mW at 65 MSPS
300 mW at 40 MSPS
On-Chip Reference and Sample-and-Hold
750 MHz Analog Input Bandwidth
SNR > 73 dBc to Nyquist @ 65 MSPS
SFDR > 86 dBc to Nyquist @ 65 MSPS
Differential Nonlinearity Error = ؎0.7 LSB
Guaranteed No Missing Codes over Full Temperature Range
1 V to 2 V p-p Differential Full-Scale Analog Input Range
Single 5 V Analog Supply, 3.3 V/5 V Driver Supply
Out-of-Range Indicator
Straight Binary or Twos Complement Output Data
Clock Duty Cycle Stabilizer
Output Enable Function
48-Lead LQFP Package
APPLICATIONS
Communications Subsystems (Microcell, Picocell)
Medical and High End Imaging Equipment
Ultrasound Equipment
VIN+
VIN–
CLK+
CLK–
DCS
FUNCTIONAL BLOCK DIAGRAM
AVDD
REFT REFB
DRVDD
AD9244
SHA
TEN
STAGE
PIPELINE
ADC
14
DFS
TIMING
OUTPUT
REGISTER
OTR
REFERENCE
D13–D0
14
OEB
AGND CML VR VREF SENSE REF
GND
DGND
GENERAL DESCRIPTION
The AD9244 is a monolithic, single 5 V supply, 14-bit,
40 MSPS/65 MSPS analog-to-digital converter with an on-chip,
high performance sample-and-hold amplifier and voltage reference.
The AD9244 uses a multistage differential pipelined architecture
with output error correction logic to provide 14-bit accuracy at
40 MSPS/65 MSPS data rates and guarantees no missing codes
over the full operating temperature range.
The AD9244 has an on-board, programmable voltage reference.
An external reference can also be used to suit the dc accuracy
and temperature drift requirements of the application.
A differential or single-ended clock input is used to control all
internal conversion cycles. The digital output data can be pre-
sented in straight binary or in twos complement format. An
out-of-range (OTR) signal indicates an overflow condition that
can be used with the most significant bit to determine low or
high overflow.
Fabricated on an advanced CMOS process, the AD9244 is
available in a 48-lead low profile quad flatpack package (LQFP)
and is specified for operation over the industrial temperature
range (–40°C to +85°C).
PRODUCT HIGHLIGHTS
Low Power—The AD9244, at 550 mW, consumes a frac-
tion of the power of presently available ADCs in existing
high speed solutions.
IF Sampling—The AD9244 delivers outstanding perfor-
mance at input frequencies beyond the first Nyquist zone.
Sampling at 65 MSPS with an input frequency of 100 MHz,
the AD9244 delivers 71 dB SNR and 86 dB SFDR.
Pin Compatibility—The AD9244 offers a seamless
migration from the 12-bit, 65 MSPS AD9226.
On-Board Sample-and-Hold (SHA)—The versatile SHA
input can be configured for either single-ended or differ-
ential inputs.
Out-of-Range (OTR)—The OTR output bit indicates
when the input signal is beyond the AD9244’s input range.
Single Supply—The AD9244 uses a single 5 V power
supply, simplifying system power supply design. It also
features a separate digital output driver supply to accom-
modate 3.3 V and 5 V logic families.
REV. A
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