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參數(shù)資料
| 型號(hào)： | SAA7707H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 數(shù)字信號(hào)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)： | 13/48頁 |
| 文件大?。?/td> | 244K |
| 代理商： | SAA7707H |
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1997 May 30
13
Philips Semiconductors
Preliminary specification
Car radio Digital Signal Processor (CDSP)
SAA7707H
8.9
Common mode reference voltage for MPX ADC
and buffers (pin V
refMPX
)
The middle reference voltage of the MPX ADC can be
filtered via this pin. This middle reference voltage is used
as a half supply voltage reference for the MPX ADC,
switch capacitor DACs and buffers. An external capacitor
(connected to V
SSA1
) prevents crosstalk between the
switch capacitor DACs and buffers and improves the
power supply rejection ratio.
8.10
Supply voltages for the switch capacitor DACs
of the FMMPX ADC and FMRDS ADC
(pins V
DACNM
and V
DACPM
)
These pins are used as ground and positive supply voltage
reference for the MPX ADC, RDS ADC and the switch
capacitor DACs. For optimum performance they must be
connected directly to V
SSA1
and V
DDA1
.
8.11
Noise level
The High-Pass 1 (HP1 or narrow-band noise level filter)
output of the second MPX decimation filter, in a frequency
band from 60 to 120 kHz, is detected with an envelope
detector and decimated to a frequency of 38 kHz.
The response time of the detector is 100 ms.
Another option is the High-Pass 2 (HP2 or wide-band
noise level filter). This output from the first MPX decimation
filter is in a frequency band from 60 to 240 kHz. It has the
same properties as the HP1 and is also decimated to
38 kHz. Which signal is used (HP1 or HP2) is determined
by the input selector control register. The noise level can
be detected and filtered in the DSP core and can be used
to optimize the FM weak-signal processing. The transfer
curves of both filters before decimation are illustrated in
Fig.6.
Fig.6 Frequency response of noise level before decimation.
handbook, full pagewidth
0
10
110
130
150
0
α
(dB)
100
50
150
200
250
300
350
f (kHz)
MBH167
30
50
90
70
(1)
(2)
(1) Narrow-band noise level filter.
(2) Wide-band noise level filter.
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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: |
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