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參數(shù)資料
| 型號： | MAX5385 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Cost, Low-Power, 8-Bit DACs with 3-Wire Serial Interface in SOT23 |
| 中文描述： | 低成本、低功耗、8位DAC，帶有3線串行接口，SOT23封裝 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 342K |
| 代理商： | MAX5385 |
input register, it transfers its contents to the DAC latch
on
CS
’
s low-to-high transition (Figure 3). Note that if
CS
is not kept low during the entire 16 SCLK cycles, data
will be corrupted. In this case, reload the DAC latch
with a new 16-bit word. The serial clock (SCLK) can
idle either high or low between transitions. Figure 4
shows the complete 3-wire serial interface transmis-
sion. Table 3 lists serial interface mapping.
Applications Information
Device Powered by an External Reference
Since the MAX5385 generates an output voltage pro-
portional to V
DD
, a noisy power supply will affect the
accuracy of the on-board reference, thereby affecting
the overall accuracy of the DAC. The circuit in Figure 5
rejects this power-supply noise by powering the device
directly with a precision voltage reference, improving
overall system accuracy. The MAX6103 (+3V, 75ppm)
or the MAX6105 (+5V, 75ppm) precision voltage refer-
ences are ideal choices due to the low power require-
ments of the MAX5385. This solution is also useful
when the required full-scale output voltage is different
from the available supply voltages.
Digital Inputs and Interface Logic
The digital interface for the 8-bit DAC is based on a
3-wire standard that is compatible with SPI, QSPI, and
MICROWIRE interfaces. The three digital inputs (
CS
, DIN,
and SCLK) load the digital input serially into the DAC.
All the digital inputs include Schmitt-trigger buffers to
accept slow-transition interfaces. This means that opto-
couplers can interface directly to the MAX5383/
MAX5384/MAX5385 without additional external logic.
The digital inputs are compatible with CMOS logic levels
and can be driven with voltages up to +5.5V regardless
of the supply voltage.
Power-Supply Bypassing and Layout
Careful PC board layout is important for best system
performance. To reduce crosstalk and noise injection,
keep analog and digital signals separate. To ensure
that the ground return from GND to the supply ground
is short and low impedance, a ground plane is recom-
mended. Bypass V
DD
with a 0.1μF capacitor to ground
as close as possible to the device. If the supply is
excessively noisy, connect a 10
resistor in series with
the supply and V
DD
and add additional capacitance.
M
Low-Cost, Low-Power, 8-Bit DACs with 3-Wire
Serial Interface in SOT23
_______________________________________________________________________________________
9
Table 3. Serial Interface Mapping
X
= Don’t care
16-BIT SERIAL WORD
ANALOG
OUTPUT
0V
V
REF
×
(255/256)
V
REF
×
(1/256)
V
REF
×
(128/256)
MSB
XX00
XX00
XX00
XX00
LSB
XXXX
XXXX
XXXX
XXXX
FUNCTION
0000
1111
0000
1000
0000
1111
0001
0000
Normal operation
Normal operation
Normal operation
Normal operation
XX01
XXXX
XXXX
XXXX
0V
Shutdown,
1k
to GND
XX10
XXXX
XXXX
XXXX
0V
Shutdown,
100k
to GND
XX11
XXXX
XXXX
XXXX
0V
Shutdown,
1M
to GND
Table 2. Shutdown Modes
DAC CODE
[D13 AND D12]
01
10
11
MODE
OUTPUT RESISTANCE TO
GROUND (
)
1k
100k
1M
MAXIMUM SUPPLY
CURRENT (
μ
A)
1
1
1
Shutdown
Shutdown
Shutdown
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| MAX5385EZT | 制造商:Maxim Integrated Products 功能描述:LOW-COST LOW-POWER 8-BIT DACS WITH 3-WIRE SERIAL INTERFACE I - Rail/Tube |
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