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參數(shù)資料
| 型號： | AD5664BCPZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC NANO 16BIT QUAD 10-LFCSP |
| 產(chǎn)品培訓模塊： | Data Converter Fundamentals DAC Architectures |
| 標準包裝： | 1 |
| 系列： | nanoDAC™ |
| 設置時間： | 4µs |
| 位數(shù)： | 16 |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 4 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-WFDFN 裸露焊盤，CSP |
| 供應商設備封裝： | 10-LFCSP-WD（3x3） |
| 包裝： | 標準包裝 |
| 輸出數(shù)目和類型： | 4 電壓，單極；4 電壓，雙極 |
| 采樣率（每秒）： | 223k |
| 產(chǎn)品目錄頁面： | 783 (CN2011-ZH PDF) |
| 配用： | EVAL-AD5664REBZ-ND - BOARD EVALUATION FOR AD5664R |
| 其它名稱： | AD5664BCPZ-REEL7DKR |
AD5624/AD5664
Rev. 0 | Page 20 of 24
APPLICATIONS
CHOOSING A REFERENCE FOR THE
AD5624/AD5664
To achieve the optimum performance from the AD5624/
AD5664, thought should be given to the choice of a precision
voltage reference. The AD5624/AD5664 have only one
reference input, VREF. The voltage on the reference input is used
to supply the positive input to the DAC. Therefore, any error in
the reference is reflected in the DAC.
When choosing a voltage reference for high accuracy applica-
tions, the sources of error are initial accuracy, ppm drift, long-
term drift, and output voltage noise. Initial accuracy on the
output voltage of the DAC leads to a full-scale error in the DAC.
To minimize these errors, a reference with high initial accuracy
is preferred. Choosing a reference with an output trim
adjustment, such as the ADR423, allows a system designer to
trim out system errors by setting a 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 measurement of how much the reference
drifts over time. A reference with a tight long-term drift
specification ensures that the overall solution remains relatively
stable during 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 temperature
dependence of the DAC output voltage in ambient conditions.
In high accuracy applications, which have a relatively low noise
budget, reference output voltage noise needs to be considered. It
is important to choose a reference with as low an output noise
voltage as practical for the system noise resolution required.
Precision voltage references such as the ADR425 produce low
output noise in the 0.1 Hz to10 Hz range. Examples of recom-
mended precision references for use as supply to the
AD5624/AD5664 are shown in the Table 14.
USING A REFERENCE AS A POWER SUPPLY FOR
THE AD5624/AD5664
Because the supply current required by the AD5624/AD5664 is
extremely low, an alternative option is to use a voltage reference
to supply the required voltage to the part (see Figure 39). 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 AD5624/AD5664 (see Table 14 for a suitable
reference). If the low dropout REF195 is used, it must supply
450 μA of current to the AD5624/AD5664, 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
450 μA + (5 V/5 kΩ) = 1.45 mA
The load regulation of the REF195 is typically 2 ppm/mA,
which results in a 2.9 ppm (14.5 μV) error for the 1.45 mA
current drawn from it. This corresponds to a 0.191 LSB error.
AD5624/
AD5664
3-WIRE
SERIAL
INTERFACE
SYNC
SCLK
DIN
15V
5V
500mA
VOUT = 0V TO 5V
VDD
REF195
VREF
05
94
3-
04
2
Figure 39. REF195 as Power Supply to the AD5624/AD5664
Table 14. Partial List of Precision References for Use with the AD5624/AD5664
Part No.
Initial Accuracy (mV max)
Temp Drift (ppm
o
C max)
0.1 Hz to 10 Hz Noise (μV p-p typ)
VOUT (V)
±2
3
3.4
5
±6
25
5
±2
5
50
5
±2
3
4
2.5/3
±2
3
3.4
3
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| AD5664RBCBZ-3-RL7 | 制造商:Analog Devices 功能描述:QUAD3V16BITSPIDACWITHREFERENCE - Tape and Reel 制造商:Analog Devices 功能描述:IC DAC 16BIT QUAD 12WLCSP |
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