DAC1106_15 Datasheet, PDF (1/2 Pages) Analog Devices – High Speed Digitalto Analog Converter

,. ANALOG
W DEVICES
HighSpeed
Digitalto AnalogConverter
. DAC1106
FEATURES
High Speed
8 Bits in 25ns
10 Bits in 50ns
Adjustment Free Operation
Gain TC: :t10ppmfC
Linearity Error: :t%LSB
Small Size: 2" x 2" x 0.4" Module
OBSOLETE GENERAL DESCRIPTION
The DAC1106 is a high speed, current output digital-to-analog
converter which is available in both eight and ten bit versions.
The very fast settling times to Y2LSBof 25nsec (8 bit models)
and 50nsec (10 bit models) make these devices ideally suited
for use in high speed applications such as computer driven dis-
plays, automatic test equipment and function generators. Ac-
curacy specifications include :tY2LSBlinearity, 10ppm/C tem-
perature coefficient, and 0.002%/V power supply rejection.
rent output will begin to occur approximately 10nsec after a
new digital word is applied. Because of this extremely fast
response, time skew in the digital input can result in momen-
tary erroneous outputs or "glitches". Consider, for example,
the case of a transition from 1000. . .0 to 0111 . . . I, a step
of only one LSB. If the MSB turns to a "0" before the rest of
the bits have turned to "I "'s, the input will momentarily be
0000 . . . 0 and the converter will start to respond accordingly
as shown below in Figure I.
Everything needed to perform high speed conversions is con-
tained in the compact 2" x 2" x 0.4" package of the DACII 06.
Included are a precision temperature compensated reference
source, high speed current switches and a carefully trimmed
network of weighting resistors. Because of the inherent stabil-
ity and careful factory adjustment of this device, no external
zero or gain adjustment potentiometers are required.
100. . .00
-¹L^LSB
011.. .11
The digital inputs of the DACII06 are fully DTL/TTL com-
patible. Binary code is used for unipolar operation and Offset
Binary code is used for bipolar operation. The current output
of this device can be applied directly to an external resistor to
develop a voltage output or it can be applied to the input of a
fast settling op amp if amplification or impedance transforma-
tion is desired.
Figure 1. Switching Transient Caused by Time Skew
These switching transients will be minimized if the digital input
data time skew is held to less than 5nsec.
INPUT CONSIDERATIONS
The binary weighted current sources which form the basis of
the digital to analog conversion process are directly switched
by their associated input bits. A change in the converter's cllr-
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 implica-
tion or otherwise under any patent or patent rights of Analog Devices.
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