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參數(shù)資料
| 型號： | MAX549 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | +2.5V to +5.5V, Low-Power, Single/Dual, 8-Bit Voltage-Output DACs in レMAX Package |
| 中文描述： | 2.5V至5.5V，低功耗，單/雙，8位電壓在レmax包裝輸出DAC |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 172K |
| 代理商： | MAX549 |
M
+2.5V to +5.5V, Low-Power, S ingle/Dual,
8-Bit Voltage-Output DACs in μMAX Pac kage
______________________________________________________________________________________
13
Table 6. Analog Output vs. Code
Microprocessor Interfacing
The MAX548A/MAX549A/MAX550A serial interface is
SPI/QSPI and Microwire compatible. For SPI/QSPI, clear
the CPOL and CPHA bits (CPOL = 0 and CPHA = 0).
CPOL = 0 sets the clock idle state to zero, and CPHA =
0 changes data at SCLK’s falling edge. This is the
Microwire default condition. If a serial port is not avail-
able on your microprocessor, three bits of a parallel port
can be used to emulate a serial port by bit manipulation.
Operate the serial clock only when necessary, to mini-
mize digital feedthrough at the DAC registers.
__________Applic ations Information
Power-S upply
and Ground Considerations
Connect GND to the highest quality ground available.
Bypass V
DD
with a 0.1μF to 0.22μF capacitor to GND.
The reference input can be used without bypassing.
However, for optimum line/load-transient response and
noise performance, bypass the reference input with a
0.1μF to 4.7μF capacitor to GND.
Careful PC board layout minimizes crosstalk in DAC regis-
ters, the reference, and the digital inputs. Separate analog
traces by running ground traces between them. Make sure
that high-frequency digital lines are not routed parallel to
analog lines.
Digital Feedthrough
High-speed data at any of the digital input pins can
couple through a DAC’s internal stray package capaci-
tance and cause noise (digital feedthrough) at the DAC
output, even though
LDAC
and/or
CS
are held high
(see Typical Operating Characteristics). Test digital
feedthrough by holding
LDAC
and/or
CS
high and tog-
gling the digital inputs from all 1s to all 0s.
Analog Feedthrough
Due to internal stray capacitance, higher frequency analog
input signals at REF can couple to the output, even when
the input digital code is all 0s. This condition is shown in
the MAX549A/MAX550A Reference AC Feedthrough vs.
Frequency graph in the Typical Operating Characteristics.
Test analog feedthrough by setting all DAC outputs to 0V
and sweeping REF.
Note:
1LSB = V
REF
x 2
-8
= V
REF
(1 / 256); ANALOG OUTPUT = +V
REF
(I / 256), where I = Integer Value of Digital Input.
_____________________________________________Pin Configurations (c ontinued)
OUTB
DIN
1
2
8
7
V
DD
REF
OUTA
CS
GND
DIP/
μ
MAX
TOP VIEW
3
4
6
5
MAX549A
LDAC
SCLK
DIN
1
2
8
7
V
DD
REF
OUT
CS
GND
DIP/
μ
MAX
3
4
6
5
MAX550A
ANALOG OUTPUT (V)
+V
REF
(255 / 256)
+V
REF
(129 / 256)
+V
REF
(128 / 256) = +V
REF
/ 2
+V
REF
(127 / 256)
+V
REF
(1 / 256)
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
1
1
1
0
1
0
1
0
1
0
1
1
1
0
1
0
0
0
D6
1
D4
1
D5
1
D2
1
0
DAC CONTENTS
D0
1
0
D1
1
0
D3
1
0
D7
1
0
0
0
0
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