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參數(shù)資料
| 型號： | AD8300 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | +3 Volt, Serial Input Complete 12-Bit DAC(串行輸入完備的12位D/A轉(zhuǎn)換器) |
| 中文描述： | 3伏，串行輸入完整的12位DAC（串行輸入完備的12位的D / A轉(zhuǎn)換器） |
| 文件頁數(shù)： | 8/8頁 |
| 文件大?。?/td> | 328K |
| 代理商： | AD8300 |
REV. 0
–8–
AD8300
V
OH
and V
OL
voltage levels. Consequently, for optimum dissipa-
tion use of CMOS logic versus TTL provides minimal dissipa-
tion in the static state. A V
INL
= 0 V on the logic input pins
provides the lowest standby dissipation of 1.2 mA with a +3.3 V
power supply.
As with any analog system, it is recommended that the AD8300
power supply be bypassed on the same PC card that contains
the chip. Figure 12 shows the power supply rejection versus fre-
quency performance. This should be taken into account when
using higher frequency switched-mode power supplies with
ripple frequencies of 100 kHz and higher.
One advantage of the rail-to-rail output amplifiers used in the
AD8300 is the wide range of usable supply voltage. The part is
fully specified and tested over temperature for operation from
+2.7 V to +5.5 V. If reduced linearity and source current capa-
bility near full scale can be tolerated, operation of the AD8300
is possible down to +2.1 volts. The minimum operating supply
voltage versus load current plot in Figure 2 provides information
for operation below V
DD
= +2.7 V.
TIMING AND CONTROL
The AD8300 has a separate serial-input register from the 12-bit
DAC register that allows preloading of a new data value into the
serial register without disturbing the present DAC output volt-
age value. Data can only be loaded when the
CS
pin is active
low. After the new value is fully loaded in the serial-input regis-
ter, it can be asynchronously transferred to the DAC register by
strobing the
LD
pin. The DAC register uses a level sensitive
LD
strobe that should be returned high before any new data is
loaded into the serial-input register. At any time the contents of
the DAC resister can be reset to zero by strobing the
CLR
pin
which causes the DAC output voltage to go to zero volts. All of
the timing requirements are detailed in Figure 3 along with
Table I, Control Logic Truth Table.
All digital inputs are protected with a Zener type ESD protec-
tion structure (Figure 22) that allows logic input voltages to
exceed the V
DD
supply voltage. This feature can be useful if the
user is loading one or more of the digital inputs with a 5V
CMOS logic input voltage level while operating the AD8300 on
a +3.3 V power supply. If this mode of interface is used, make
sure that the V
OL
of the +5 V CMOS meets the V
IL
input
requirement of the AD8300 operating at 3 V. See Figure 7 for
the effect on digital logic input threshold versus operating V
DD
supply voltage.
V
DD
LOGIC
IN
GND
Figure 22. Equivalent Digital Input ESD Protection
Unipolar Output Operation
This is the basic mode of operation for the AD8300. The
AD8300 has been designed to drive loads as low as 400
in
parallel with 500 pF. The code table for this operation is shown
in Table II.
APPLICATIONS INFORMATION
See DAC8512 data sheet for additional application circuit ideas.
Table II. Unipolar Code Table
Hexadecimal
Number in
DAC Register
Decimal
Number in
DAC Register
Analog Output
Voltage (V)
FFF
801
800
7FF
000
4095
2049
2048
2047
0
+2.0475
+1.0245
+1.0240
+1.0235
+0.0000
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Lead SOIC (SO-8)
0.0098 (0.25)
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
8
°
0
°
0.0196 (0.50)
0.0099 (0.25)
x 45
°
PIN 1
0.1574 (4.00)
0.1497 (3.80)
0.2440 (6.20)
0.2284 (5.80)
4
5
1
8
0.0192 (0.49)
0.0138 (0.35)
(1.27)
BSC
0.0688 (1.75)
0.0532 (1.35)
0.0098 (0.25)
0.0040 (0.10)
0.1968 (5.00)
0.1890 (4.80)
8-Pin Plastic DIP (N-8)
0.160 (4.06)
0.115 (2.93)
0.130
(3.30)
MIN
0.210
(5.33)
MAX
0.015
(0.381) TYP
0.430 (10.92)
0.348 (8.84)
0.280 (7.11)
0.240 (6.10)
4
5
8
1
0.070 (1.77)
0.045 (1.15)
0.022 (0.558)
0.014 (0.356)
0.325 (8.25)
0.300 (7.62)
0
°
- 15
°
0.100
(2.54)
BSC
0.015 (0.381)
0.008 (0.204)
SEATING
PLANE
0.195 (4.95)
0.115 (2.93)
P
C
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