- 您現在的位置：買賣IC網 > PDF目錄373913 > AD7679ASTRL (ANALOG DEVICES INC) 18-Bit, 2.5 LSB INL, 570 kSPS SAR ADC PDF資料下載
參數資料
| 型號： | AD7679ASTRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 18-Bit, 2.5 LSB INL, 570 kSPS SAR ADC |
| 中文描述： | 1-CH 18-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PQFP48 |
| 封裝： | LOW PROFILE, MS-026BBC, LQFP-48 |
| 文件頁數： | 19/28頁 |
| 文件大小： | 1186K |
| 代理商： | AD7679ASTRL |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁當前第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
AD7679
Power Supply
The AD7679 uses three sets of power supply pins: an analog 5 V
supply (AVDD), a digital 5 V core supply (DVDD), and a digital
output interface supply (OVDD). The OVDD supply defines the
output logic level and allows direct interface with any logic
working between 2.7 V and DVDD + 0.3 V. To reduce the
number of supplies needed, the digital core (DVDD) can be
supplied through a simple RC filter from the analog supply, as
shown in Figure 25. The AD7679 is independent of power
supply sequencing once OVDD does not exceed DVDD by
more than 0.3 V, and is therefore free from supply voltage
induced latch-up. Additionally, it is very insensitive to power
supply variations over a wide frequency range (see Figure 30).
Rev. 0 | Page 19 of 28
SAMPLING RATE (SPS)
1000000
P
μ
W
1M
100000
10000
1000
100
10
1
0.1
100k
10k
1k
100
1
10
PDBUFHIGH
03085-0-033
FREQUECY (kHz)
65
P
40
100
1000
10000
1
10
60
55
50
45
03085-0-032
Figure 31. Power Dissipation vs. Sample Rate
CONVERSION CONTROL
Figure 32 shows the detailed timing diagrams of the conversion
process. The AD7679 is controlled by the CNVST signal, which
initiates conversion. Once initiated, it cannot be restarted or
aborted, even by PD, until the conversion is complete. The
CNVST signal operates independently of CS and RD.
CNVST
t
1
t
2
MODE
ACQUIRE
CONVERT
ACQUIRE
CONVERT
t
7
t
8
BUSY
t
4
t
3
t
5
t
6
03085-0-034
Figure 30. PSRR vs. Frequency
POWER DISSIPATION VERSUS THROUGHPUT
The AD7679 automatically reduces its power consumption at
the end of each conversion phase. During the acquisition phase,
the operating currents are very low, which allows for a
significant power savings when the conversion rate is reduced,
as shown in Figure 31. This feature makes the AD7679 ideal for
very low power battery applications.
Figure 32. Basic Conversion Timing
Although CNVST is a digital signal, it should be designed with
special care with fast, clean edges and levels with minimum
overshoot and undershoot or ringing.
It should be noted that the digital interface remains active even
during the acquisition phase. To reduce the operating digital
supply currents even further, the digital inputs need to be
driven close to the power rails (DVDD and DGND), and
OVDD should not exceed DVDD by more than 0.3 V.
For applications where SNR is critical, the CNVST signal should
have very low jitter. This may be achieved by using a dedicated
oscillator for CNVST generation, or to clock it with a high
frequency low jitter clock, as shown in Figure 25.
For other applications, conversions can be automatically
initiated. If CNVST is held low when BUSY is low, the AD7679
controls the acquisition phase and automatically initiates a new
conversion. By keeping CNVST low, the AD7679 keeps the
conversion process running by itself. It should be noted that the
analog input has to be settled when BUSY goes low. Also, at
power-up, CNVST should be brought low once to initiate the
conversion process. In this mode, the AD7679 could sometimes
run slightly faster than the guaranteed limits of 570 kSPS.
相關PDF資料 |
PDF描述 |
|---|---|
| AD7675 | 16-Bit, 100 kSPS, Differential ADC |
| AD7675AST | 16-Bit, 100 kSPS, Differential ADC |
| AD7675ASTRL | 16-Bit, 100 kSPS, Differential ADC |
| AD7676 | 16-Bit +-1 LSB INL, 500 kSPS, Differential ADC |
| AD7676AST | 16-Bit +-1 LSB INL, 500 kSPS, Differential ADC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7679ASTZ | 功能描述:IC ADC 18BIT 570KSPS 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:PulSAR® 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD7679ASTZ | 制造商:Analog Devices 功能描述:IC 18-BIT ADC |
| AD7679ASTZRL | 功能描述:IC ADC 18BIT SAR W/BUFF 48LQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:PulSAR® 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
| AD7679CB1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:18-Bit, 2.5 LSB INL, 570 kSPS SAR ADC |
| AD767A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Microprocessor-Compatible 12-Bit D/A Converter |
發布緊急采購，3分鐘左右您將得到回復。