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參數(shù)資料
| 型號： | AD5764BSU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | Complete, Quad, 16-Bit, High Accuracy, Serial Input, Bipolar Voltage Output DAC |
| 中文描述： | SERIAL INPUT LOADING, 8 us SETTLING TIME, 16-BIT DAC, PQFP32 |
| 封裝： | MO-026-ABA, TQFP-32 |
| 文件頁數(shù)： | 23/27頁 |
| 文件大小： | 251K |
| 代理商： | AD5764BSU |
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AD5764
Preliminary Technical Data
APPLICATIONS INFORMATION
TYPICAL OPERATING CIRCUIT
Figure shows the typical operating circuit for the AD5764.
The only external components needed for this precision 16-bit
DAC are decoupling capacitors on the supply pins, R-C
connection from REFOUT to REFAB and REFCD and a short
circuit current setting resistor. Because the device incorporates
a voltage reference, and reference buffers, it eliminates the need
for an external bipolar reference and associated buffers. This
leads to an overall saving in both cost and board space.
Rev. PrC 21-Oct-04| Page 24 of 28
In the circuit below, VDD and VSS are both conneted to ±15 V,
but VDD and VSS can operate with supplies from ±11.4 V to
±16.5 V. In Figure , AGNDA is connected to REFGND, but
the option of Force/Sense is included on this device, if required
by the user.
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
AD5764
/SYNC
SCLK
SDIN
SDO
D0
D1
/LDAC
CLR
VOUTA
VOUTB
AGNDB
AGNDC
VOUTD
VOUTC
AGNDA
AGNDD
/
/
D
D
A
P
A
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
6k
100 nF
1
1
1
10 μF
10 μF
100 nF
100 nF
10 μF
10 μF
1
3
TEMP
Figure 11. Typical operating circuit
Force/Sense of AGND
Because of the extremelyhigh accuracy of this device, system
design issues such as grounding and contact resistance are very
important. The AD5764, with ±10 V output, has an LSB size of
305 μV. Therefore, series wiring and connector resistances of
very small values could cause voltage drops of an LSB. For this
reason, the AD5764 offers a Force/Sense output configuration.
Figure shows how to connect the AD5764 to the Force/Sense
amplifier. Where accuracy of the output is important, an
amplifier such as the OP177 is ideal. The OP177 is ultraprecise
with offset voltages of 10 μV maximum at room temperature
and offset drift 0f 0.1 μV/°C maximum. Alternative
recommended amplifiers are the OP1177 and the OP77. For
applications where optimization of the circuit for settling time is
needed, the AD845 is recommended.
Figure . Driving REFGND and AGNDA using a force/sense
amplifier
Precision Voltage Reference Selection
To achieve the optimum performance from the AD5764 over it’s
full operating temperature range an external voltage reference
must be used. Thought should be given to the selection of a
precision voltage reference. The AD5764 has two reference
inputs, REFAB and REFCD. The voltages applied to the
reference inputs are used tomprovide a buffered positiver 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.
Initial accuracy error on the output voltage of an external
reference 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. Also, 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
adjustment 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 lon-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
tempaerature coefficient specifiaction 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 waith 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 Hx to 10 Hz region.
However, as the circuit bandwidth increases, filtering the output
of the reference may be required to minimise the output noise.
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