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參數資料
| 型號： | AD7679AST |
| 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： | 24/28頁 |
| 文件大小： | 1186K |
| 代理商： | AD7679AST |
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AD7679
BUSY
BUSY
#2 (UPSTREAM)
#1 (DOWNSTREAM)
RDC/SDIN
SDOUT
CNVST
CS
SCLK
RDC/SDIN
SDOUT
CNVST
CS
SCLK
DATA
OUT
SCLK IN
CS IN
CNVST IN
BUSY
OUT
03085-0-044
Figure 42. Two AD7679s in a Daisy-Chain Configuration
External Clock Data Read during Conversion
Figure 41 shows the detailed timing diagrams of this method.
During a conversion, while both CS and RD are low, the result
of the previous conversion can be read. The data is shifted out
MSB first with 18 clock pulses, and is valid on both the rising
and falling edge of the clock. The 18 bits have to be read before
the current conversion is complete. If that is not done,
RDERROR is pulsed high and can be used to interrupt the host
interface to prevent incomplete data reading. There is no daisy-
chain feature in this mode, and the RDC/SDIN input should
always be tied either high or low.
To reduce performance degradation due to digital activity, a fast
discontinuous clock is recommended to ensure that all bits are
read during the first half of the conversion phase. It is also
possible to begin to read the data after conversion and continue
to read the last bits even after a new conversion has been
initiated.
MICROPROCESSOR INTERFACING
The AD7679 is ideally suited for traditional dc measurement
applications supporting a microprocessor, and for ac signal
processing applications interfacing to a digital signal processor.
The AD7679 is designed to interface either with a parallel 8-bit
or 16-bit wide interface, or with a general-purpose serial port or
I/O ports on a microcontroller. A variety of external buffers can
be used with the AD7679 to prevent digital noise from coupling
into the ADC. The following section illustrates the use of the
AD7679 with an SPI equipped DSP, the ADSP-219x.
SPI Interface (ADSP-219x)
Figure 43 shows an interface diagram between the AD7679 and
the SPI equipped ADSP-219x. To accommodate the slower
speed of the DSP, the AD7679 acts as a slave device, and data
must be read after conversion. This mode also allows the daisy-
chain feature. The convert command could be initiated in
response to an internal timer interrupt. The 18-bit output data
are read with 3-byte SPI access. The reading process could be
initiated in response to the end-of-conversion signal (BUSY
going low) using an interrupt line of the DSP. The serial
interface (SPI) on the ADSP-219x is configured for master
mode (MSTR) = 1, Clock Polarity Bit (CPOL) = 0, Clock Phase
Bit (CPHA) = 1, and SPI interrupt enable (TIMOD) = 00, by
writing to the SPI Control register (SPICLTx). It should be
noted that to meet all timing requirements, the SPI clock should
be limited to 17 Mbits/s, which allow it to read an ADC result in
about 1.1 μs. When a higher sampling rate is desired, use of one
of the parallel interface modes is recommended.
AD7679*
ADSP-219x*
SER/PAR
PFx
MISOx
SCKx
PFx or TFSx
BUSY
SDOUT
SCLK
CNVST
EXT/INT
CS
RD
INVSCLK
DVDD
*ADDITIONAL PINS OMITTED FOR CLARITY
SPIxSEL (PFx)
03085-0-045
Figure 43. Interfacing the AD7679 to an SPI Interface
Rev. 0 | Page 24 of 28
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相關代理商/技術參數 |
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| AD7679ASTRL | 制造商:Analog Devices 功能描述:ADC Single SAR 570ksps 18-bit Parallel/Serial 48-Pin LQFP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 570KSPS 18BIT PARALLEL/SERL 48LQFP - Tape and Reel |
| 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 |
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