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参数资料
| 型号： | AD6622AS |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 通信及网络 |
| 英文描述： | Four-Channel, 75 MSPS Digital Transmit Signal Processor TSP |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP128 |
| 封装： | METRIC, QFP-128 |
| 文件页数： | 27/28页 |
| 文件大小： | 242K |
| 代理商： | AD6622AS |
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AD6622
–27–
REV. 0
Driving Multiple TSP Serial Ports
When properly con
fi
gured, the AD6622 will drive each SDFS
out of phase. Each new piece of data should be driven only into
the TSP that pulses its SDFS pin at that time.
In the UMTS example, L = 64 and N
TSP
= 4, so each serial port
need only accept every 4th
input sample. Each serial port is
shifting at peak capacity, so sample 1, 2, and 3 begin shifting
into Serial Ports B, C, and D before Sample 0 is completed into
Serial Port A.
0
1
2
3
4
5
6
7
SDFSA
SDFSB
SDFSC
SDFSD
Figure 21. SDFS Timing for WBCDMA
RAM
COEF
FILTER
CIC
NCO
I
Q
8.196MSPS 65.536MSPS
S
D
R
4.096
MCPS
1.024
MCPS
32
1.024
MCPS
32
1.024
MCPS
1.024
MCPS
65.536
MSPS
DAC
COMPLEX SIGNAL 32 BITS (16 I, 16 Q)
REAL OR IMAGINARY SIGNAL
AD6622
32
32
32
RAM
COEF
FILTER
CIC
NCO
I
Q
8.196MSPS 65.536MSPS
RAM
COEF
FILTER
CIC
NCO
I
Q
8.196MSPS 65.536MSPS
RAM
COEF
FILTER
CIC
NCO
I
Q
8.196MSPS 65.536MSPS
Figure 22. Block Diagram for WBCDMA
0
5
10
15
20
0
0.5
1.0
25
30
COEF
–
J
Figure 23. Typical Impulse Response for WBCDMA
–
70
d
–
60
–
50
–
40
–
30
–
20
–
10
0
10
–
100
–
90
–
80
RAM COEFFICIENT FILTER
0
1000
2000
3000
4000
kHz
5000
6000
7000
8000
Figure 24. Typical FIR Frequency Response for WBCDMA
–
70
d
–
60
–
50
–
40
–
30
–
20
–
10
0
–
100
–
90
–
80
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
–
110
–
120
dB(AD6624(f))
dB
(
)
H
CIC
(f)
LEVEL
5
SPEC( f )
4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
f
MHz
Figure 25. Typical Composite Frequency Response for
WBCDMA
THERMAL MANAGEMENT
The power dissipation of the AD6622 is primarily determined
by three factors: the clock rate, the number of channels active,
and the distribution of interpolation rates. The faster the clock
rate the more power dissipated by the CMOS structures of
the AD6622; the more channels active, the higher the overall
power of the chip. Low interpolation rates in the CIC stages
(CIC5, CIC2) results in higher power dissipation. All these factors
should be analyzed as each application has different thermal
requirements.
The AD6622 128-lead MQFP is specially designed to provide
excellent thermal performance. To achieve the best performance,
the power and ground leads should be connected directly to
planes on the PC board. This provides the best thermal transfer
from the AD6622 to the PC board.
相关PDF资料 |
PDF描述 |
|---|---|
| AD6622PCB | Four-Channel, 75 MSPS Digital Transmit Signal Processor TSP |
| AD6622S | Four-Channel, 75 MSPS Digital Transmit Signal Processor TSP |
| AD6622 | Four-Channel, 75 MSPS Digital Transmit Signal Processor TSP |
| AD6623 | 4-Channel, 104 MSPS Digital Transmit Signal Processor TSP |
| AD6623ABC | 4-Channel, 104 MSPS Digital Transmit Signal Processor TSP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD6622PCB | 制造商:AD 制造商全称:Analog Devices 功能描述:Four-Channel, 75 MSPS Digital Transmit Signal Processor TSP |
| AD6622S | 制造商:AD 制造商全称:Analog Devices 功能描述:Four-Channel, 75 MSPS Digital Transmit Signal Processor TSP |
| AD6622S/PCB | 制造商:AD 制造商全称:Analog Devices 功能描述:Four-Channel, 75 MSPS Digital Transmit Signal Processor TSP |
| AD6623 | 制造商:Analog Devices 功能描述: |
| AD6623ABC | 制造商:Analog Devices 功能描述:Signal Processor 196-Pin CSP-BGA 制造商:Rochester Electronics LLC 功能描述:4 CHANNEL, 104 MSPS DIGITAL TSP - Bulk |
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