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參數(shù)資料
| 型號(hào)： | MAX547 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Octal, 13-Bit Voltage-Output DAC with Parallel Interface(八通道,并行,電壓輸出,13位D/A轉(zhuǎn)換器) |
| 中文描述： | 八通道、13位、電壓輸出DAC，并行接口 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 276K |
| 代理商： | MAX547 |
load regulation is specified to 20ppm/mA max over
temperature, resulting in a maximum error of 36ppm
(90μV). This corresponds to a maximum error caused
by reference load regulation of only 0.147LSB
[0.147LSB = 90μV/(5V/8192)LSB] over temperature.
If you want a ±4.096V full-scale output swing (1LSB =
1mV), you can use the calibrated, low-drift, low-dropout
MAX676. Operating from a 5V supply, it is fully speci-
fied to drive two REF_ inputs with less than 60.4μV error
(0.0604LSB) over temperature, caused by the maxi-
mum load step.
Referenc e Buffering
Another way to obtain high accuracy is to buffer a refer-
ence with an op amp. When driving all reference inputs
simultaneously, keep the closed-loop output imped-
ance of the op amp below 0.03
to ensure an error of
less than 0.1LSB. The op amp must also drive the
capacitive load (typically 500pF to 1200pF).
Each reference input can also be buffered separately
by using the circuit in Figure 6. A reference load step
caused by a digital transition only affects the DAC pair
where the code transition occurs. It also allows the use
of references with little drive capability. Keep the
closed-loop output impedance of each op amp below
0.12
, to ensure an error of less than 0.1LSB. Figure 6
shows the op amp’s inverting input directly connected
to the MAX547’s reference terminal. This eliminates the
influence of board lead resistance by sensing the volt-
age with a low-current path sense line directly at the
reference input.
Adding feedback resistors to individual reference
buffer amplifiers enables different reference voltages to
be generated from a single reference.
M
Oc tal, 13-Bit Voltage-Output
DAC with Parallel Interfac e
______________________________________________________________________________________
11
Figure 5. Optional Schottky Diode between V
SS
and GND
GND
V
SS
SYSTEM GND
1N5817
MAX547
V
SS
BIPOLAR OPERATION
(AGND_ = 0V)
CUSTOM OPERATION
POSITIVE UNIPOLAR
OPERATION
(AGND_ = REF_/2)
PARAMETER
AGND_ (=0V)
AGND–
Bipolar Zero Level, or
Unipolar Mid-scale,
(Code = 1000000000000)
REF–
REF–- AGND–
REF–/2
Differential Reference Voltage
(V
DR
)
AGND–
(
= R2
)
-REF–
AGND–- V
DR
0V
Negative Full-scale Output
(Code = All 0s)
(
4095
)(
REF_
)
4096
4096
AGND _ +
(
4095
)(
V
DR
)
(
8191
)(
REF_
)
8192
(
REF_
)
8192
(
—D
)(
REF_
)
8192
Positive Full-Scale Output
(Code = All 1s)
REF_
4096
DR
V
4096
LSB Weight
(
—D
)(
REF_
)
4096
AGND _ +
(
D
)(
V
DR
)
4096
VOUT
–
as a Function of
Digital Code (D, 0 to 8191)
Table 5. Reference, AGND– and Output Relationships
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