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参数资料
| 型号： | AD73322LYST |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 通信及网络 |
| 英文描述： | Low Cost, Low Power CMOS General-Purpose Dual Analog Front End |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP44 |
| 封装： | PLASTIC, MS-026-BEA, LQFP-44 |
| 文件页数： | 33/40页 |
| 文件大小： | 437K |
| 代理商： | AD73322LYST |
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REV. 0
AD73322L
–33–
and the DSP program initializes pointers to the top of the buffer
i3 = ^init_cmds; l3 = %init_cmds;
and puts the first entry in the DSP
’
s transmit buffer so that it is
available at the first SDOFS pulse.
ax0 = dm(i3,m1);
tx0 = ax0;
The DSP
’
s transmit interrupt is enabled.
imask = b#0001000000;
At each occurrence of an SDOFS pulse, the DSP
’
s transmit
buffer contents are sent to the SDI pin of the AD73322L. This
also causes a subsequent DSP Tx interrupt which transfers the
initialization word, pointed to by the circular buffer pointer, to
the Tx buffer. The buffer pointer is updated to point to the next
unsent initialization word. When the circular buffer pointer wraps
around, which happens after the last word has been accessed, it
indicates that the initialization phase is complete. This can be done
“
manually
”
in the DSP using a simple address check, or auto-
buffered mode can be used to complete the transfer automatically.
txcdat: ar = dm(stat_flag);
ar = pass ar;
if eq rti;
ena sec_reg;
ax0 = dm (i3, m1);
tx0 = ax0;
ax0 = i3;
ay0 = ^init_cmds;
ar = ax0 - ay0;
if gt rti;
ax0 = 0x00;
dm (stat_flag) = ax0;
rti;
In the main body of the program, the code loops waiting for the
initialization sequence to be completed.
check_init:
ax0 = dm (stat_flag);
af = pass ax0;
if ne jump check_init;
As the AD73322L is effectively a cascade of two codec units, it
is important to observe some restrictions in the sequence of
sending initialization words to the two codecs. It is preferable to
send pairs of control words for the corresponding control regis-
ters in each codec, and it is essential to send the control word
for codec 2 before that for codec 1. Control Registers A and
B contain settings, such as sampling rate, serial clock rate, etc.,
which critically require synchronous update in both codecs.
Once the device has been initialized, Control Register A on both
codecs is written with a control word which changes the operat-
ing mode from Program Mode to either data mode or Mixed
Control Data Mode. The device count field which defaults to
000b will have to be programmed to 001b for a single AD73322L
device. In data mode or mixed mode, the main function of the
device is to return ADC samples from both codecs and to accept
DAC words for both codecs. During each sample interval, two
ADC samples will be returned from the device, while in the same
interval two DAC update samples will be sent to the device. In
order to reduce the number of interrupts and to reduce com-
plexity, autobuffering can be used to ensure that only one
interrupt is generated during each sampling interval.
相关PDF资料 |
PDF描述 |
|---|---|
| AD73322L | KNOB, RT25; Series:29JF RoHS Compliant: Yes |
| AD73322 | Low Cost, Low Power CMOS General Purpose Dual Analog Front End(低成本，低功耗的CMOS通用双模拟前端处理器) |
| AD73411 | Low-Power CMOS Analog Front End with DSP Microcomputer(带DSP微计算机的单模拟前端) |
| AD73422-40K | Integrated Dual Analog Front End Codec And DSP Microcomputer(集成双模拟前端的信号编解码器和数字信号处理器的芯片) |
| AD73422BB-80 | Dual Low Power CMOS Analog Front End with DSP Microcomputer |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD73322LYSTZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD73360 | 制造商:AD 制造商全称:Analog Devices 功能描述:Six-Input Channel Analog Front End |
| AD73360AR | 制造商:Analog Devices 功能描述:AFE General Purpose 6ADC 16-Bit 5V 28-Pin SOIC W 制造商:Analog Devices 功能描述:IC 16-BIT ADC |
| AD73360AR-REEL | 制造商:Analog Devices 功能描述:AFE General Purpose 6ADC 16-Bit 5V 28-Pin SOIC W T/R 制造商:Analog Devices 功能描述:AFE GEN PURPOSE 6ADC 16BIT 5V/5V/5V 28SOIC W - Tape and Reel |
| AD73360AR-REEL7 | 制造商:Analog Devices 功能描述:AFE General Purpose 6ADC 16-Bit 5V 28-Pin SOIC W T/R 制造商:Analog Devices 功能描述:AFE GEN PURPOSE 6ADC 16BIT 5V/5V/5V 28SOIC W - Tape and Reel |
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