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參數(shù)資料
| 型號： | AD7922AUJ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | Circular Connector; No. of Contacts:7; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:16S; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle |
| 中文描述： | 2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO8 |
| 封裝： | MO-193BA, TSOT-8 |
| 文件頁數(shù)： | 27/32頁 |
| 文件大?。?/td> | 386K |
| 代理商： | AD7922AUJ-REEL7 |
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AD7912/AD7922
For example, the ADSP-2189 has a master clock frequency of
40 MHz. If the SCLKDIV register is loaded with the value of 3,
then an SCLK of 5 MHz is obtained, and eight master clock
periods elapse for every one SCLK period. Depending on the
throughput rate selected, if the timer register is loaded with the
value 803 (803 + 1 = 804), then 100.5 SCLK occur between
interrupts and subsequently between transmit instructions. This
situation results in nonequidistant sampling, because the
transmit instruction occurs on a SCLK edge. If the number of
SCLKs between interrupts is a whole integer figure of
N
, then
equidistant sampling is implemented by the DSP.
AD7912/AD7922 to DSP563xx Interface
The connection diagram in Figure 41 shows how the AD7912/
AD7922 can be connected to the SSI (synchronous serial
interface) of the DSP563xx family of DSPs from Motorola. The
SSI is operated in synchronous and normal mode (SYN = 1 and
MOD = 0 in the Control Register B, CRB) with internally
generated word frame sync for both Tx and Rx (Bits FSL1 = 0
and FSL0 = 0 in the CRB). Set the word length in the Control
Register A (CRA) to 16 by setting bits WL2 = 0, WL1 = 1, and
WL0 = 0 for the AD7922. This DSP does not offer the option for
a 14-bit word length, so the AD7912 word length is set up to
16 bits like the AD7922. For the AD7912, the conversion process
uses 16 SCLK cycles, with the last two clock periods clocking
out two trailing zeros to fill the 16-bit word.
Rev. 0 | Page 27 of 32
To implement the power-down mode on the AD7912/AD7922,
the word length can be changed to 8 bits by setting Bits
WL2 = 0, WL1 = 0, and WL0 = 0 in CRA. The FSP bit in the
CRB register can be set to 1, which means that the frame goes
low and a conversion starts. Likewise, by means of the Bits
SCD2, SCKD, and SHFD in the CRB register, the Pin SC2 (the
frame sync signal) and SCK in the serial port are configured as
outputs, and the MSB is shifted first.
The values are as follows:
MOD = 0
SYN = 1
WL2, WL1, WL0 depend on the word length
FSL1 = 0, FSL0 = 0
FSP = 1, negative frame sync
SCD2 = 1
SCKD = 1
SHFD = 0
Note that, for signal processing applications, the frame
synchronization signal from the DSP563xx must provide
equidistant sampling.
AD7912/
AD7922*
DSP563xx*
SCK
SCLK
SRD
DOUT
STD
DIN
SC2
CS
0
*ADDITIONAL PINS REMOVED FOR CLARITY
Figure 41. Interfacing to the DSP563xx
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD7912AUJ-REEL7 | Circular Connector; No. of Contacts:5; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:16S; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:16S-8 RoHS Compliant: No |
| AD7912 | 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs |
| AD7912ARM | 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs |
| AD7912ARM-REEL | 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs |
| AD7912ARM-REEL7 | 2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7922AUJZ-REEL7 | 功能描述:IC ADC DUAL 12BIT 2CH TSOT-23-8 RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個單端，單極；2 個差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7923 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Channel, 200 kSPS, 12-Bit ADC with Sequencer in 16-Lead TSSOP |
| AD7923_11 | 制造商:AD 制造商全稱:Analog Devices 功能描述:4-Channel, 200 kSPS 12-Bit ADC with Sequencer in 16-Lead TSSOP |
| AD7923BRU | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 4CH 200 kSPS 12-Bit W/ Sequencer RoHS:否 制造商:Analog Devices 通道數(shù)量: 結(jié)構(gòu): 轉(zhuǎn)換速率: 分辨率: 輸入類型: 信噪比: 接口類型: 工作電源電壓: 最大工作溫度: 安裝風(fēng)格: 封裝 / 箱體: |
| AD7923BRU-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Serial 16-Pin TSSOP T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 200KSPS 12-BIT SERL 16TSSOP - Tape and Reel |
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