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| 型號： | AD5744RCSUZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | Complete Quad, 14-Bit, High Accuracy, Serial Input, Bipolar Voltage Output DAC |
| 中文描述： | SERIAL INPUT LOADING, 8 us SETTLING TIME, 14-BIT DAC, PQFP32 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MS-026ABA, TQFP-32 |
| 文件頁數(shù)： | 26/32頁 |
| 文件大?。?/td> | 489K |
| 代理商： | AD5744RCSUZ-REEL7 |
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AD5744R
APPLICATIONS INFORMATION
TYPICAL OPERATING CIRCUIT
Figure 39 shows the typical operating circuit for the AD5744R.
The only external components needed for this precision 14-bit
DAC are decoupling capacitors on the supply pins and reference
inputs, and an optional short-circuit current setting resistor.
Because the AD5744R incorporates a voltage reference and
reference buffers, it eliminates the need for an external bipolar
reference and associated buffers. This leads to an overall savings
in both cost and board space.
Rev. PrA | Page 26 of 32
Precision Voltage Reference Selection
To achieve the optimum performance from the AD5744R over
its full operating temperature range, an external voltage
reference must be used. Thought should be given to the
selection of a precision voltage reference. The AD5744R has two
reference inputs, REFAB and REFCD. The voltages applied to
the reference inputs are used to provide a buffered positive and
negative reference for the DAC cores. Therefore, any error in
the voltage reference is reflected in the outputs of the device.
There are four possible sources of error to consider when
choosing a voltage reference for high accuracy applications:
initial accuracy, temperature coefficient of the output voltage,
long term drift, and output voltage noise.
Figure 39
and V
SS
can operate with supplies from ±11.4 V to ±16.5 V. In
Figure 39, AGNDA is connected to REFGND.
In
, V
DD
and V
SS
are both connected to ±15 V, but V
DD
1
2
3
4
5
6
7
8
23
22
21
18
19
20
24
17
9
10 11
12
13
14 15
16
32
31
30
29
28
27
26
25
AD5744R
SYNC
SCLK
SDIN
SDO
D0
LDAC
CLR
D1
VOUTA
VOUTB
AGNDB
VOUTD
VOUTC
AGNDC
AGNDA
AGNDD
R
R
D
D
C
A
D
P
A
S
I
B
A
A
T
R
R
R
R
SYNC
SCLK
SDIN
SDO
LDAC
D0
D1
RSTOUT
RSTIN
BIN/2sCOMP
+5V
+5V
+15V
–15V
+15V –15V
VOUTA
VOUTB
VOUTC
VOUTD
100nF
1
1
10μF
100nF
100nF
10μF
10μF
1
TEMP
1
10μF
0
Initial accuracy error on the output voltage of an external refer-
ence could lead to a full-scale error in the DAC. Therefore, to
minimize these errors, a reference with low initial accuracy
error specification is preferred. Choosing a reference with an
output trim adjustment, such as the ADR425, allows a system
designer to trim system errors out by setting the reference
voltage to a voltage other than the nominal. The trim ad-
justment can also be used at temperature to trim out any error.
Long term drift is a measure of how much the reference output
voltage drifts over time. A reference with a tight long-term drift
specification ensures that the overall solution remains relatively
stable over its entire lifetime.
The temperature coefficient of a reference’s output voltage
affects INL, DNL, and TUE. A reference with a tight
temperature coefficient specification should be chosen to
reduce the dependence of the DAC output voltage on ambient
conditions.
In high accuracy applications, which have a relatively low noise
budget, reference output voltage noise needs to be considered.
Choosing a reference with as low an output noise voltage as
practical for the system resolution required is important.
Precision voltage references such as the ADR435 (XFET design)
produce low output noise in the 0.1 Hz to 10 Hz region.
However, as the circuit bandwidth increases, filtering the output
of the reference may be required to minimize the output noise.
Figure 39. Typical Operating Circuit
Table 16. Some Precision References Recommended for Use with the AD5744R
Part No.
Initial Accuracy(mV Max)
Long-Term Drift (ppm Typ)
ADR435
±6
30
ADR425
±6
50
ADR02
±5
50
ADR395
±6
50
AD586
±2.5
15
Temp Drift (ppm/°C Max)
3
3
3
25
10
0.1 Hz to 10 Hz Noise (μV p-p Typ)
3.4
3.4
15
5
4
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