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AD74322AARU Folha de dados(PDF) 9 Page - Analog Devices |
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AD74322AARU Folha de dados(HTML) 9 Page - Analog Devices |
9 / 20 page AD74322 –9– Pr D 03/00 PRELIMINARY TECHNICAL DATA PRELIMINAR Y TECHNICAL DA TA 4 4 DUAL REGULATOR DSP AD743xx FILTER 2.4 V 3.3 V 5.0 V AVDD VDD2 VDD1 AGND DGND DGND DVDD Figure <MCLK_Divider> The divider ratios will allow more convenient sample rate selection from a common MCLK which may be required in many voice related applications. Example 1: fSAMP = 48 kHz and 8 kHz required MCLK = 48*103 * 256 = 12.288 MHz to cater for 48 kHz fSAMP For fSAMP = 8 kHz, it is necessary to use the /3 setting in Pre-Scaler 1, the /2 setting in Pre-Scaler 2 and pass through in Pre-Scaler 3. This results in an IMCLK = 8*103 * 256 = 2.048 MHz (= 12.288 MHz/6). Example 2: fSAMP = 48 kHz and 32 kHz required MCLK = 24.576 MHz For fSAMP = 48 kHz, it is necessary to use the /2 setting in Pre-Scaler 1 and the /1 (pass-through) setting in Pre- Scaler 2 and pass through in Pre-Scaler 3. This results in an IMCLK = 48*103 * 256 = 12.288 MHz. For fSAMP = 32 kHz, it is necessary to use the /3 setting in Pre-Scaler 1 and the /1 (pass-through) setting in Pre- Scaler 2 and pass through in Pre-Scaler 3. This results in an IMCLK = 32*103 * 256 = 8.192 MHz. Example 3: fSAMP = 44.1 kHz and 11.025 kHz required MCLK = 44.1*103 * 256 = 11.2896 MHz to cater for 44.1 kHz fSAMP For fSAMP= 11.025 kHz, it is necessary to use the /1 setting in Pre- Scaler 1 and the /4 setting in Pre-Scaler 2 and pass through in Pre-Scaler 3. This results in an IMCLK = 11.025*10 3 * 256 = 2.8224 MHz (= 11.2896 MHz/4). SampleRates Forallapplicationsthesamplingrateisdefinedbytheinternalmaster clockfrequency(IMCLK)whereIMCLK=256*fSAMP. Power-On Reset The AD74322 features a power-on reset circuit which ensures that all internal circuitry is reset and initialised to Figure <PSU_Connection> a known state following the power-up of the device. There is also a software reset capability available by setting the RESET bit in Control Register _. This control register is accessed through the Control Port. Power Supplies and Grounds The AD74322 features three separate supplies: AVDD, DVDD1 and DVDD2. AVDD is the supply to the analog section of the device and must therefore be of sufficient quality to preserve the AD74322’s performance characteristics. It is nominally a 2.4 V supply. DVDD1 is the supply for the digital interface section of the device. It is fed from the digital supply voltage of the DSP or controller to which the device is interfaced and allows the AD74322 to interface with devices operating at supplies of between 2.4 V -5% to 3.3 V + 10%. DVDD2 is the supply for the digital core of the AD74322. It is nominally a 2.4 V supply. |
Nº de peça semelhante - AD74322AARU |
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Descrição semelhante - AD74322AARU |
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