參數(shù)資料
型號(hào)： SAA7705H
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Car radio Digital Signal Processor（DSP）(車載電臺(tái)數(shù)字信號(hào)處理器)
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP80
文件頁(yè)數(shù)： 15/60頁(yè)
文件大?。?/td> 1857K
代理商： SAA7705H
1999 Aug 16
15
Philips Semiconductors
Preliminary specification
Car radio Digital Signal Processor (DSP)
SAA7705H
8.2.6
S
UPPLY OF THE ANALOG INPUTS
The analog input circuit has separate power supply
connections to allow maximum filtering of the analog
supply voltages: V
SSA1
for the analog ground and V
DDA1
for the analog supply.
8.3
Analog outputs
8.3.1
DAC
S
Each of the four low noise high dynamic range DACs
consists of a 15-bit signed magnitude DAC with current
output, followed by a buffer operational amplifier. For each
of the four audio output channels a separate convertor is
used. Each converter output is connected to the inverting
input of one of the four internal CMOS operational
amplifiers. The non-inverting input of this operational
amplifier is connected to the internal reference voltage.
Together with an internal resistor the conversion of
current-to-voltage of the audio output is achieved.
8.3.2
U
PSAMPLE FILTER
To reduce spectral components above the audio band, a
fixed 4 times oversampling and interpolating 18-bit digital
IIR filter is used. It is realized as a bit serial design and
consists of two consecutive filters. The data path in these
filters is 22 bits to prevent overflow and to maintain a
signal-to-noiseratiolargerthen105 dB.Thewordclockfor
the upsample filter (4
×
f
s
) is derived from the audio source
timing. If the internal audio source is selected, the sample
frequencycanbeeither44.1 or 38 kHz.Incaseofexternal
digital sources (CD1 and CD2), a sample frequency from
32 to 48 kHz is possible.
8.3.3
V
OLUME CONTROL
Thetotalvolumecontrolhasadynamicrangeofmorethan
100 dB (0 dB being maximal input on the I
2
S-bus input).
With the signed magnitude noise shaped 15-bit DAC and
the internal 18-bit registers (these registers provide the
digital data communication between the DSP and the
QDAC) of the DSP core a useful digital volume control
range of 100 dB is possible by calculating the
corresponding coefficients.
The step size is freely programmable and an additional
analog volume control is not needed in this design.
The SNR of the audio output at full-scale is determined by
the total 15 bits of the converter. The noise at low outputs
is fully determined by the noise performance of the DAC.
Since it is a signed magnitude type, the noise at digital
silence is also low. The disadvantage is that the total THD
is higher than conventional DACs. The typical
THD-plus-noise versus output level is shown in Fig.5.
Fig.5 Typical THD + N curve versus output level.
handbook, full pagewidth
(dB)
80
90
80
70
MGM125
40
0
30
20
10
60
50
40
50
60
70
30
20
output level (dB)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA7706H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Car radio Digital Signal Processor (DSP)
SAA7706H/N107 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC DIGITAL SIGNAL PROCESSOR RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
SAA7706H/N107,518 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC DIRAC-1 RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
SAA7706H/N107,557 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC DIGITAL SIGNAL RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
SAA7706H/N107S,518 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC CAR RADIO DIGITAL SIGNAL PROCESSOR RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT
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