參數(shù)資料
型號(hào)： DAC8420FS
廠商： ANALOG DEVICES INC
元件分類(lèi)： DAC
英文描述： Quad 12-Bit Serial Voltage Output DAC
中文描述： QUAD, SERIAL INPUT LOADING, 8 us SETTLING TIME, 12-BIT DAC, PDSO16
封裝： MS-013AA, SOIC-16
文件頁(yè)數(shù)： 12/16頁(yè)
文件大?。?/td> 587K
代理商： DAC8420FS
DAC8420
REV. 0
–12–
single supply operation is obtained with the output load
connected to ground, so the output stage does not have to sink
current.
Like all amplifiers, the DAC8420 output buffers do generate
voltage noise, 52 nV/
√
Hz
typically. This is easily reduced by
adding a simple RC low-pass filter on each output.
Reference Configuration
The two reference inputs of the DAC8420 allow a great deal of
flexibility in circuit design. The user must take care, however, to
observe the minimum voltage input levels on VREFHI and
VREFLO to maintain the accuracy shown in the data sheet.
These input voltages can be set anywhere across a wide range
within the supplies, but must be a minimum of 2.5 V apart in
any case. See Figure 1. A wide output voltage range can be
obtained with
±
5 V references, which can be provided by the
AD588 as shown in Figure 28. Many applications utilize the
DACs to synthesize symmetric bipolar wave forms, which
requires an accurate, low drift bipolar reference. The AD588
provides both voltages and needs no external components. Ad-
ditionally, the part is trimmed in production for 12-bit accuracy
over the full temperature range without user calibration. Per-
forming a Clear with the reset select CLSEL HIGH allows the
user to easily reset the DAC outputs to midscale, or zero volts in
these applications.
When driving the reference inputs VREFHI and VREFLO, it is
important to note that VREFHI both sinks and sources current,
and that the input currents of both are code dependent. Many
voltage reference products have limited current sinking capabil-
ity and must be buffered with an amplifier to drive VREFHI, in
order to maintain overall system accuracy. The input VREFLO,
however, has no such requirement.
–15V SUPPLY
DAC-8420
DIGITAL
CONTROL
4
9
15 16
14
12
11
10
8
2
3
6
7
1
5
DAC A
DAC B
DAC C
DAC D
VOUTA
VOUTB
VOUTC
VOUTD
DIGITAL INPUTS
GND
VREFLO
–5V
0.1μF
0.1μF
+15V SUPPLY
+5V
VREFHI
7
R5
R4
R6
6
9
R
B
R1
R2
R3
A2
A1
A3
A4
6
4
3
1
14
15
11
8
12
5
13
2
16
0.1μF
0.1μF
SYSTEM
GROUND
AD588
–15V
SUPPLY
+15V
SUPPLY
+5V
–5V
1μF
10
+V
S
–V
S
Figure 28.
±
10 V Bipolar Reference Configuration Using the AD588
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