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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： | 30/40页 |
| 文件大小： | 437K |
| 代理商： | AD73322LYST |
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REV. 0
AD73322L
–30–
TFS
DT
SCLK
DR
RFS
ADSP-218x
DSP
AD73322L
CODEC
SDIFS
SDI
SCLK
SDO
SDOFS
FL0
FL1
RESET
SE
Figure 34. AD73322L Connected to ADSP-218x
FSX
DT
CLKX
DR
FSR
TMS320C5x
DSP
AD73322L
CODEC
SDIFS
SDI
SCLK
SDO
SDOFS
XF
RESET
SE
CLKR
Figure 35. AD73322L Connected to TMS320C5x
Cascade Operation
Where it is required to configure a cascade of up to eight codecs
(four AD73322L dual codecs), it is necessary to ensure that the
timing of the SE and
RESET
signals is synchronized at each
device in the cascade. A simple D type flip flop is sufficient to
sync each signal to the master clock MCLK, as in Figure 36.
1/2
74HC74
CLK
D
Q
DSP CONTROL
TO SE
MCLK
SE SIGNAL SYNCHRONIZED
TO MCLK
1/2
74HC74
CLK
D
Q
DSP CONTROL
TO
RESET
MCLK
RESET
SIGNAL SYNCHRONIZED
TO MCLK
Figure 36. SE and
RESET
Sync Circuit for Cascaded
Operation
Connection of a cascade of devices to a DSP, as shown in Fig-
ure 37, is no more complicated than connecting a single device.
Instead of connecting the SDO and SDOFS to the DSP
’
s Rx
port, these are now daisy-chained to the SDI and SDIFS of the
next device in the cascade. The SDO and SDOFS of the final
device in the cascade are connected to the DSP
’
s Rx port to
complete the cascade. SE and
RESET
on all devices are fed
from the signals that were synchronized with the MCLK using
the circuit as described above. The SCLK from only one device
need be connected to the DSP
’
s SCLK input(s) as all devices
will be running at the same SCLK frequency and phase.
Grounding and Layout
Since the analog inputs to the AD73322L are differential, most
of the voltages in the analog modulator are common-mode volt-
ages. The excellent common-mode rejection of the part will
remove common-mode noise on these inputs. The analog and
digital supplies of the AD73322L are independent and separately
pinned out to minimize coupling between analog and digital
sections of the device. The digital filters on the encoder section
will provide rejection of broadband noise on the power supplies,
except at integer multiples of the modulator sampling frequency.
The digital filters also remove noise from the analog inputs
provided the noise source does not saturate the analog modula-
tor. However, because the resolution of the AD73322L
’
s ADC
is high, and the noise levels from the AD73322L are so low,
care must be taken with regard to grounding and layout.
TFS
DT
DR
RFS
AD73322L
CODEC
SDIFS
SDI
SCLK
SDO
SDOFS
SCLK
DEVICE 1
MCLK
SE
RESET
AD73322L
CODEC
SDIFS
SDI
SCLK
SDO
SDOFS
DEVICE 2
MCLK
SE
RESET
74HC74
Q1
Q2
D1
D2
FL0
FL1
ADSP-218x
DSP
Figure 37. Connection of Two AD73322Ls Cascaded to
ADSP-218x
相关PDF资料 |
PDF描述 |
|---|---|
| AD73322L | KNOB, RT25; Series:29JF RoHS Compliant: Yes |
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| AD73411 | Low-Power CMOS Analog Front End with DSP Microcomputer(带DSP微计算机的单模拟前端) |
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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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