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PDF AD9768 Data sheet ( Hoja de datos )
| Número de pieza | AD9768 | |
| Descripción | Ultrahigh Speed IC D/A Converter | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD9768 (archivo pdf) en la parte inferior de esta página. Total 4 Páginas | ||
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a
Ultrahigh Speed IC
D/A Converter
FEATURES
5 ns Settling Time
100 MSPS Update Rate
20 mA Output Current
ECL-Compatible
40 MHz Multiplying Mode
APPLICATIONS
Raster Scan & Vector Graphic Displays
High Speed Waveform Generation
Digital VCOs
Ultrafast Digital Attenuators
AD9768
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The Analog Devices AD9768SD D/A converter is a monolithic
current-output converter which can accept 8 bits of ECL-level
digital input voltages and convert them into analog signals at
update rates as high as 100 MSPS. In addition to its use as a
standard D/A converter, it can also be utilized as a two-quadrant
multiplying D/A at multiplying bandwidths as high as 40 MHz.
An inherently low glitch design is used, and the complementary
current outputs are suitable for driving transmission lines
directly. Nominal full-scale output is 20 mA, which corresponds
to a 1 volt drop across a 50 Ω load, or ± 1 volt across 100 Ω
returned to +1 volt. The actual output current is determined by
the on-chip reference voltage (VREF Ϸ –1.26 V) and an external
current setting resistor, RSET.
Full-scale output current IOUT with digital “1” at all inputs is
calculated with the equation:
IOUT
= 4 × VRET –VREF
RSET
The setting resistor RSET and the output load resistor should
both have low temperature coefficients. A complementary
IOUT is also provided.
AD9768JD/SD PIN CONNECTIONS
The reference voltage source is a modified bandgap type
and is nominally –1.26 volts. This reference supply requires
no external regulation. To reduce the possibility of noise
generation and/or instability, Pin 15 (REFERENCE OUT)
can be decoupled using a high-quality ceramic chip
capacitor. Stabilization of the internal loop amplifier is by a
single capacitor connected from Pin 17 (COMPENSATION)
to ground. The minimum value for this capacitor is 3900 pF,
although a 0.01 µF ceramic chip capacitor is recommended.
The incredible speed characteristics of the AD9768SD D/A
converter make it attractive for a wide range of high speed
applications. The ability of the unit to operate as a two-
quadrant multiplying D/A converter adds another dimen-
sion to its usefulness and makes the AD9768SD a truly
versatile device.
AD9768SE PIN CONNECTIONS
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
1 page | ||
| Páginas | Total 4 Páginas | |
| PDF Descargar | [ Datasheet AD9768.PDF ] | |
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