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參數(shù)資料
| 型號： | AD9768SD |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | Ultrahigh Speed IC D/A Converter |
| 中文描述： | PARALLEL, 8 BITS INPUT LOADING, 0.005 us SETTLING TIME, 8-BIT DAC, CDIP18 |
| 封裝： | HERMETIC SEALED, CERAMIC, DIP-18 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大小： | 103K |
| 代理商： | AD9768SD |
AD9768
REV. A
–4–
C
P
If the load resistor (R
L
) has a value of 50 ohms, if R
SET
has a
value of 220 ohms, and if V
RET
is 0 V, the center of the V
M
voltage will be –0.6 V; and it can vary from –0.1 V to –1.1 V.
T ypically, the frequency of these variations has an upper limit of
250 kHz when operating in the voltage multiplying mode; that
frequency is the 3 dB point of the bandwidth of the internal
reference amplifier.
T he combined effects of variations in V
M
and changes in digital
input values are shown in Figure 3, I
OUT
vs. Multiplying Volt-
age. In this illustration, the ordinate of the graph is expressed in
terms of milliamps of I
OUT
current at Pin 13. V
OUT
, of course,
will be a function of the value of R
L
chosen by the user.
Figure 3. I
OUT
vs. Multiplying Voltage
T he negative value of V
M
on the horizontal axis is shown start-
ing at approximately –0.1 V, rather than 0 V, because the
AD9768 must have some small value of voltage applied to per-
form a multiplying function. For the conditions shown in the
figure, output current starts to become nonlinear at approxi-
mately 20 mA because of the maximum 30 mA output drive
capabilities of the device. Different values for R
SET
and R
L
would alter the point where limiting first appears.
CURRE NT MULT IPLY ING MODE
T he AD9768 D/A converter can be operated at markedly higher
multiplying rates when operated in a current-multiplying mode,
as contrasted with the voltage multiplying mode. Refer to Figure
4, Multiplying AD9768SD (Current Mode).
Figure 4. Multiplying AD9768SD (Current Mode)
In this mode, the internal reference amplifier and its inherent
frequency limitations are replaced by a current source comprised
of U1 and associated circuits. T hese circuits supply a unipolar
current I
M
which is one-fourth the full-scale output current
(with digital “1” applied to all inputs) and set current flow
through the load resistor.
V
IN
is some voltage chosen by the user for his particular applica-
tion; the value of this voltage is based in part on the size of the
load resistor and the 0 mA to 5 mA range of I
M
. V
IN
can have
frequency components as high as 40 MHz. V
ADJ
and R
ADJ
pro-
vide an offset adjustment to compensate for the dc component
of V
IN
to assure I
M
is always a unipolar current between 0 mA
and 5 mA. T he values of the required voltages and resistors can
be calculated using the equations which are part of Figure 4.
Refer to Figure 5, I
OUT
vs. Multiplying Current.
Figure 5. I
OUT
vs. Multiplying Current
As shown, I
M
can vary over the range of 0 mA to 5 mA; a value
of approximately 0.3 mA may be the practical lower limit because
of nonlinearities at extremely small current levels. T hese changes
in I
M
are combined with variations in digital inputs, producing
complex changes in the output current (at pin 13) and in V
OUT
.
T he “rounding” of the current curve in the graph is the result of
I
OUT
approaching the 30 mA maximum drive capabilities of the
AD9768 and needs to be taken into account to assure optimum
performance in the selected application.
OUT LINE DIME NSIONS
Dimensions shown in inches and (mm).
Ceramic (D-18)
LCC (E -20A)
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