a
10-Bit, 400 MSPS
D/A Converters
AD9720/AD9721
lated bipolar process. The AD9720 is ECL compatible, and will
update up to 400 MSPS; the AD9721 is TTL compatible and
will update up to 100 MSPS.
Designed for direct digital synthesis (DDS), waveform reconstruction, and high resolution video applications, both devices
feature low glitch impulse of 1.5 pV-s and fast settling times of
4.5 ns to 1/2 LSB.
Both converters are characterized for dynamic performance, and
have excellent harmonic suppression and spectral purity in
waveform generation applications.
The units are available in 28-pin DIPs, LCCs and SOICs.
Industrial temperature range devices are packaged in plastic for
operation from –25°C to +25°C; extended temperature range
devices for operation from –55°C to +125°C are in hermetic
ceramic packages. Contact the factory for information about the
availability of MIL-STD-883 devices.
FEATURES
400 MSPS (ECL)/100 MSPS (TTL) Update Rate
Low Glitch Impulse: 1.5 pV-s
Fast Settling: 4.5 ns to 1/2 LSB
Low Power: 1.1 W
On-Board Quadrature Logic for DDS Applications
Differential Clock (ECL)
APPLICATIONS
Direct Digital Synthesis
Arbitrary Waveform Synthesis
Waveform Reconstruction
High Speed Imaging
OBS
OLE
The AD9720 and AD9721 D/A converters are 10-bit, high
speed digital-to-analog converters constructed in an oxide iso-
D 10
10
REGISTER
INVERTERS
D2
TTL
OR
ECL
DRIVE
LOGIC
DECODERS &
DRIVERS
D1
TE
FUNCTIONAL BLOCK DIAGRAM
SWITCH
NETWORK
GENERAL DESCRIPTION
ANALOG
RETURN
IOUT
IOUT
INVERT
CLOCK
REFERENCE
IN
CLOCK
+
R SET
REFERENCE
OUT
0.1µF
CONTROL
AMP OUT
CONTROL
AMP
INTERNAL
VOLTAGE
REFERENCE
–
CONTROL
AMP IN
DIGITAL
–V S
DIGITAL
+V S
BYP.
–5.2V
ANALOG
–V S
BYP.
+5V
BYP.
–5.2V
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
