For a single 5 V supply, VVREFHI is limited to at most 2" />
參數(shù)資料
型號(hào)： DAC8420ES
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 11/24頁(yè)
文件大?。?/td> 0K
描述： IC DAC 12BIT QUAD SRL-OUT 16SOIC
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝： 1
設(shè)置時(shí)間： 8µs
位數(shù)： 12
數(shù)據(jù)接口： 串行
轉(zhuǎn)換器數(shù)目： 4
電壓電源： 雙 ±
功率耗散（最大）： 255mW
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC W
包裝： 管件
輸出數(shù)目和類型： 4 電壓，單極；4 電壓，雙極
采樣率（每秒）： 125k
DAC8420
Rev. B | Page 19 of 24
For a single 5 V supply, VVREFHI is limited to at most 2.5 V, and
must always be at least 2.5 V less than the positive supply to
ensure linearity of the device. For these applications, the REF43
is an excellent low drift 2.5 V reference that consumes only
450 μA (max). It works well with the DAC8420 in a single 5 V
system as shown in Figure 34.
8
9
16
15
14
12
11
10
DAC8420
1
DAC A
DAC B
DAC C
DAC D
4
5
DIGITAL
CONTROLS
GND
DIGITAL INPUTS
VREFHI
VREFLO
2
3
6
7
+5V SUPPLY
0.1F
VOUTA
VOUTB
VOUTC
VOUTD
00
27
5-
03
4
REF43
VIN
GND
4
2
VOUT 6
0.1F
+5V SUPPLY
2.5V
Figure 34. 5 V Single-Supply Operation Using REF43
ISOLATED DIGITAL INTERFACE
Because the DAC8420 is ideal for generating accurate voltages
in process control and industrial applications, due to noise,
from the central controller; it may be necessary to isolate it
from the central controller. This can be easily achieved by using
opto-isolators, which are commonly used to provide electrical
isolation in excess of 3 kV. Figure 35 shows a simple 3-wire
interface scheme for controlling the clock, data, and load pulse.
For normal operation, CS is tied permanently low so that the
DAC8420 is always selected. The resistor and capacitor on the
CLR pin provide a power-on reset with 10 ms time constant.
The three opto-isolators are used for the SDI, CLK, and LD lines.
One opto-isolated line (LD) can be eliminated from this circuit
by adding an inexpensive 4-bit TTL counter to generate the
load pulse for the DAC8420 after 16 clock cycles. The counter
is used to count the number of clock cycles loading serial data
to the DAC8420. After all 16 bits have been clocked into the
converter, the counter resets, and a load pulse is generated on
Clock 17. In either circuit, the serial interface of the DAC8420
provides a simple, low cost method of isolating the digital control.
10k
5V
10k
5V
10k
5V
REG
5V
HIGH VOLTAGE
ISOLATION
POWER
LD
SCLK
SDI
REF43
VIN
GND
4
2
VOUT 6
+5V
10k
5V
0.1F
5V
0.1F
VOUTA
VOUTB
VOUTC
VOUTD
8
9
16
15
14
12
11
10
1
4
5
GND
VREFLO
2
3
6
7
VSS
VDD
VREFHI
CLR
CLSEL
DAC8420
CLK
SDI
CS
LD
2.5V
0
02
75-
03
5
Figure 35. Opto-lsolated 3-Wire Interface
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DAC8420ESZ2 制造商:AD 制造商全稱:Analog Devices 功能描述:Quad 12-Bit Serial Voltage Output DAC
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