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參數(shù)資料
| 型號： | SAA7707H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | Shaft; Style: 1 - light; Applicable Model: LE-P / LEL-W |
| 中文描述： | 0-BIT, 36.86 MHz, OTHER DSP, PQFP80 |
| 封裝： | 14 X 20 MM, 2.80 MM HEIGHT, PLASTIC, SOT-318-2, QFP-80 |
| 文件頁數(shù)： | 23/48頁 |
| 文件大?。?/td> | 244K |
| 代理商： | SAA7707H |
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1997 May 30
23
Philips Semiconductors
Preliminary specification
Car radio Digital Signal Processor (CDSP)
SAA7707H
After 16 clock pulses, the buffer is read and the data line is
set HIGH until the buffer is filled again. The microcontroller
stops communication by pulling the clock line HIGH.
The data is written out just after the clock HIGH-to-LOW
transition. The data is valid when the clock is HIGH.
When a new 16-bit buffer is filled before the other buffer is
read from, that buffer will be overwritten and the old data
will be lost.
10.11 DSP reset
The reset pin (DSP) is active LOW and has an internal
pull-up resistor. To allow a proper switch-on of the supply
voltage, a capacitor should be connected between this pin
(pin 26) and V
SSD
. The value of the capacitor is such that
the SAA7707H will remain in reset as long as the power
supply is not stabilized. A more or less fixed relationship
between the DSP reset and the POM (pin 21) time
constant is obligatory. The voltage on the POM pin
determines the current flowing in the DACs. At 0 V
(at pin 21), the DAC currents are zero and therefore the
DACs output voltages are also zero. At 5 V, the DAC
currents are at their nominal (maximum) value.
Long before the DAC outputs reach their nominal output
voltages, the DSP must be in the working mode (to reset
the output register) therefore, the DSP time constant must
be shorter than the POM time constant. For advised
capacitors, see Figs. 24 and 25.
The DSP reset has the following functions:
The bits of the IAC control register are set to logic 0
The bits of the input selector control register are set to
logic 0
The program counter is set to address $0000.
When the level on the DSP is at logic HIGH, the DSP
program starts to run.
10.12 Power supply connection and EMC
The digital part of the SAA7707H has 5 positive supply
lines (V
DDD1
to V
DDD5
) and 10 ground connections
(V
SSD1
to V
SSD10
). To minimize radiation, the SAA7707H
should be put on a double-layer PCB with, on one side, a
large ground plane. The ground supply lines should have
a short connection to this ground plane. A coil/capacitor
network in the positive supply line can be used as a high
frequency filter.
Fig.12 I
2
S-bus timing and format.
handbook, full pagewidth
Tcy
tLC
≥
0.35 T
tsr
≥
0.2 T
thr
≥
0
tHC
≥
0.35 T
VIH (70%)
VIL (20%)
VIH (70%)
VIL (20%)
SCK
MBH173
SD
SCK
WS
SD
WS
MSB
RIGHT
MSB
LEFT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA7708H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Car Radio Digital Signal Processor |
| SAA7709/N107 | 制造商:PHILIPS-SEMI 功能描述: |
| SAA7709H/N103 | 功能描述:音頻 DSP DIGITAL SIGNAL PROCESSOR RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| SAA7709H/N103,518 | 功能描述:音頻 DSP DIRAC-2 RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
| SAA7709H/N103,557 | 功能描述:音頻 DSP DIGITAL SIGNAL RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube |
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