參數(shù)資料
型號(hào)： AD8802ARU
廠(chǎng)商： ANALOG DEVICES INC
元件分類(lèi)： DAC
英文描述： 12 Channel, 8-Bit TrimDACs with Power Shutdown
中文描述： 12, SERIAL INPUT LOADING, 0.6 us SETTLING TIME, 8-BIT DAC, PDSO20
封裝： 1 MM HEIGHT, TSSOP-20
文件頁(yè)數(shù)： 8/16頁(yè)
文件大?。?/td> 432K
代理商： AD8802ARU
AD8802/AD8804
REV. 0
–8–
DAC 12
ADDR
DECODE
SERIAL
REGISTER
CS
CLK
SDI
DAC 2
DAC 1
Figure 18. Equivalent Control Logic
The target DAC register is loaded with the last eight bits of the
serial data-word completing one DAC update. Twelve separate
12-bit data words must be clocked in to change all twelve out-
put settings.
All digital inputs are protected with a series input resistor and
parallel Zener ESD structure shown in Figure 19. Applies to
digital input pins
CS
, SDI,
RS
,
SHDN
, CLK
LOGIC
1k
Figure 19. Equivalent ESD Protection Circuit
Digital inputs can be driven by voltages exceeding the AD8802/
AD8804 V
DD
supply value. This allows 5 V logic to interface
directly to the part when it is operated at 3 V.
APPLICATIONS
Supply Bypassing
Precision analog products, such as the AD8802/AD8804, re-
quire a well filtered power source. Since the AD8802/AD8804
operate from a single +3 V to +5 V supply, it seems convenient
to simply tap into the digital logic power supply. Unfortunately,
the logic supply is often a switch-mode design, which generates
noise in the 20 kHz to 1 MHz range. In addition, fast logic gates
can generate glitches hundred of millivolts in amplitude due to
wiring resistances and inductances.
If possible, the AD8802/AD8804 should be powered directly
from the system power supply. This arrangement, shown in Fig-
ure 20, will isolate the analog section from the logic switching
transients. Even if a separate power supply trace is not available,
however, generous supply bypassing will reduce supply-line in-
duced errors. Local supply bypassing consisting of a 10
μ
F tan-
talum electrolytic in parallel with a 0.1
μ
F ceramic capacitor is
recommended (Figure 21).
TTL/CMOS
LOGIC
CIRCUITS
+5V
POWER SUPPLY
10μF
TANT
0.1μF
+
AD8804
Figure 20. Use Separate Traces to Reduce Power Supply
Noise
AD8802/
AD8804
V
DD
DGND
10μF
0.1μF
+
+5V
Figure 21. Recommended Supply Bypassing for the
AD8802/AD8804
Buffering the AD8802/AD8804 Output
In many cases, the nominal 5 k
output impedance of the
AD8802/AD8804 is sufficient to drive succeeding circuitry. If a
lower output impedance is required, an external amplifier can
be added. Several examples are shown in Figure 22. One ampli-
fier of an OP291 is used as a simple buffer to reduce the output
resistance of DAC A. The OP291 was chosen primarily for its
rail-to-rail input and output operation, but it also offers opera-
tion to less than 3 V, low offset voltage, and low supply current.
The next two DACs, B and C, are configured in a summing
arrangement where DAC C provides the coarse output voltage
setting and DAC B can be used for fine adjustment. The inser-
tion of R1 in series with DAC B attenuates its contribution to
the voltage sum node at the DAC C output.
V
H
V
L
V
REFH
V
DD
+5V
GND
V
REFL
DIGITAL INTERFACING
OMITTED FOR CLARITY
R1
100k
OP291
AD8802/
AD8804
SIMPLE BUFFER
0V TO 5V
SUMMER CIRCUIT
WITH FINE TRIM
ADJUSTMENT
V
H
V
L
V
H
V
L
Figure 22. Buffering the AD8802/AD8804 Output
Increasing Output Voltage Swing
An external amplifier can also be used to extend the output volt-
age swing beyond the power supply rails of the AD8802/AD8804.
This technique permits an easy digital interface for the DAC,
while expanding the output swing to take advantage of higher
voltage external power supplies. For example, DAC A of Fig-
ure 23 is configured to swing from –5 V to +5 V. The actual
output voltage is given by:
V
OUT
=
1
+
R
F
R
S
D
256
×
5
V
(
)
– 5
V
where D is the DAC input value (i.e., 0 to 255). This circuit can
be combined with the “fine/coarse” circuit of Figure 22 if, for
example, a very accurate adjustment around 0 V is desired.
相關(guān)PDF資料
PDF描述
AD8804 12 Channel, 8-Bit TrimDACs with Power Shutdown(12通道,帶電源關(guān)斷8位D/A轉(zhuǎn)換器)
AD8842 Precision, Quad, SPST Analog Switches
AD8842AN Precision, Quad, SPST Analog Switches
AD8842AR 8-Bit Octal, 4-Quadrant Multiplying, CMOS TrimDAC
AD8883B 60 MHz, 2000 V/us Monolithic Op Amp
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