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參數(shù)資料
| 型號： | EVAL-AD5663REB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual 12-/14-/16-Bit nanoDAC with 5 ppm/C On-Chip Reference |
| 中文描述： | 5分之/ C對芯片參考雙12-/14-/16-Bit nanoDAC系列 |
| 文件頁數(shù)： | 26/28頁 |
| 文件大?。?/td> | 1176K |
| 代理商： | EVAL-AD5663REB |
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AD5623R/AD5643R/AD5663R
APPLICATIONS INFORMATION
USING A REFERENCE AS A POWER SUPPLY
Because the supply current required by the AD5623R/AD5643R/
AD5663R is extremely low, an alternative option is to use a
voltage reference to supply the required voltage to the parts (see
Figure 60). This is especially useful if the power supply is quite
noisy or if the system supply voltages are at some value other
than 5 V or 3 V for example, 15 V The voltage reference outputs
a steady supply voltage for the AD5623R/AD5643R/ AD5663R.
If the low dropout
REF195
is used, it must supply 500 μA of
current to the AD5623R/AD5643R/AD5663R, with no load on
the output of the DAC. When the DAC output is loaded, the
REF195 also needs to supply the current to the load. The total
current required (with a 5 kΩ load on the DAC output) is
Rev. A | Page 26 of 28
500 μA + (5 V/5 kΩ) = 1.25 mA
The load regulation of the REF195 is typically 2 ppm/mA,
which results in a 3 ppm (15 μV) error for the 1.5 mA current
drawn from it. This corresponds to a 0.196 LSB error.
AD5623R/
AD5643R/
AD5663R
THREE-WIRE
SERIAL
INTERFACE
SYNC
SCLK
DIN
15V
5V
V
OUT
= 0V TO 5V
V
DD
REF195
0
Figure 60. REF195 as Power Supply to the AD5623R/AD5643R/AD5663R
BIPOLAR OPERATION USING THE AD5663R
The AD5663R has been designed for single-supply operation,
but a bipolar output range is also possible using the circuit in
Figure 61. The circuit gives an output voltage range of ±5 V.
Rail-to-rail operation at the amplifier output is achievable using
an
AD820
or an
OP295
as the output amplifier.
The output voltage for any input code can be calculated as
follows:
×
+
R1
×
×
=
R1
R2
V
R2
R1
D
536
,
V
V
DD
DD
O
65
where
D
represents the input code in decimal (0 to 65,535).
With
V
DD
= 5 V,
R1
=
R2
= 10 kΩ,
V
5
536
,
65
10
×
=
D
V
O
This is an output voltage range of ±5 V, with 0x0000 corre-
sponding to a 5 V output, and 0xFFFF corresponding to
a
+5 V output.
THSERIAL
INTERFACE
R2 = 10k
+5V
–5V
AD820/
OP295
+5V
AD5663R
V
DD
V
OUT
R1 = 10k
±5V
0.1μF
10μF
0
Figure 61. Bipolar Operation with the AD5663R
USING THE AD5663R WITH A
GALVANICALLY ISOLATED INTERFACE
In process control applications in industrial environments,
it is often necessary to use a galvanically isolated interface to
protect and isolate the controlling circuitry from any hazardous
common-mode voltages that can occur in the area where
the DAC is functioning.
i
Coupler provides isolation in excess
of 2.5 kV. The AD5663R uses a 3-wire serial logic interface, so
the ADuM1300 3-channel digital isolator provides the required
isolation (see Figure 62). The power supply to the part also
needs to be isolated, which is done by using a transformer. On
the DAC side of the transformer, a 5 V regulator provides the
5 V supply required for the AD5663R.
0.1μF
5V
REGULATOR
GND
DIN
SYNC
SCLK
POWER
10μF
SDI
SCLK
DATA
AD5663R
V
OUT
V
OB
V
OA
V
OC
V
DD
V
IC
V
IB
V
IA
ADuM1300
0
Figure 62. AD5663R with a Galvanically Isolated Interface
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-AD5663REBZ | 功能描述:BOARD EVAL FOR AD5663 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 數(shù)模轉(zhuǎn)換器 (DAC) 系列:nanoDAC™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設(shè)置時(shí)間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
| EVAL-AD5664REB | 制造商:AD 制造商全稱:Analog Devices 功能描述:Quad, 12-/14-/16-Bit nanoDACs with 5 ppm/C On-Chip Reference |
| EVAL-AD5664REBZ | 功能描述:BOARD EVALUATION FOR AD5664R RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 數(shù)模轉(zhuǎn)換器 (DAC) 系列:nanoDAC™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設(shè)置時(shí)間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
| EVAL-AD5665REBZ1 | 功能描述:BOARD EVAL FOR AD5665 TSSOP RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 數(shù)模轉(zhuǎn)換器 (DAC) 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設(shè)置時(shí)間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
| EVAL-AD5665REBZ2 | 功能描述:BOARD EVAL FOR AD5665 LFCSP RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 數(shù)模轉(zhuǎn)換器 (DAC) 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設(shè)置時(shí)間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
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