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參數(shù)資料
| 型號(hào)： | SAA6581T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | RES 15.8K OHM 1/16W .5% 0603 SMD |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO16 |
| 封裝： | 7.50 MM, PLASTIC, SO-16 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 75K |
| 代理商： | SAA6581T |
2001 May 07
4
Philips Semiconductors
Product specification
RDS/RBDS demodulator
SAA6581T
PINNING
SYMBOL
PIN
DESCRIPTION
QUAL
RDDA
V
ref
MPX
V
DDA
V
SSA
CIN
SCOUT
MODE
SYNC
V
SSD
V
DDD
OSCI
OSCO
TCON
RDCL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
signal quality indication output
RDS data output
reference voltage output (
1
/
2
V
DDA
)
multiplex signal input
analog supply voltage (5 V)
analog ground (0 V)
comparator input
switched capacitor filter output
oscillator frequency select input
ARI clamping control input
digital ground (0 V)
digital supply voltage (5 V)
oscillator input
oscillator output
test control input
RDS clock output
handbook, halfpage
MHB900
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
QUAL
RDDA
Vref
MPX
VDDA
VSSA
CIN
SCOUT
RDCL
TCON
OSCO
OSCI
VDDD
VSSD
SYNC
MODE
SAA6581T
Fig.2 Pin configuration.
FUNCTIONAL DESCRIPTION
RDS/RBDS signal demodulation
B
ANDPASS FILTER
The bandpass filter has a centre frequency of 57 kHz. It
selects the RDS/RBDS sub-band from the multiplex signal
MPX and suppresses the audio signal components. The
filter block contains an analog anti-aliasing filter at the
inputfollowedbyan8
th
orderswitchedcapacitorbandpass
filter and a reconstruction filter at the output.
C
LOCKED COMPARATOR
The comparator digitizes the output signal from the 57 kHz
bandpass filter for further processing by the digital
RDS/RBDS demodulator. To attain high sensitivity and to
avoid phase distortion, the comparator input stage has
automatic offset compensation.
D
EMODULATOR
The demodulator provides all functions of the SAA6579
and improves performance under weak signal conditions.
Demodulator functions include:
57 kHz carrier regeneration from the two sidebands
(Costas loop)
Symbol integration over one RDS clock period
Bi-phase symbol decoding
Differential decoding
Synchronization of RDS/RBDS output data.
The RDS/RBDS demodulator recovers and regenerates
the continuously transmitted RDS/RBDS data stream in
the MPX signal and provides clock RDCL for the output
signals and data output RDDA for further processing by an
RDS/RBDS decoder, for example CCR921 or CCR922.
ARI
CLAMP
The demodulator checks the input signal for presence of
RDS only, or RDS plus ARI transmissions. After a fixed
test period, if the SYNC input is set HIGH the demodulator
locksinthe‘verified’condition(seeTable 1).IfSYNCisset
LOW, the ARI clamping is reset (disabled). After SYNC
returns to HIGH, the demodulator resumes checking the
input signal.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA6581T/V1,512 | 功能描述:調(diào)節(jié)器/解調(diào)器 RDS DEMODULATOR RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
| SAA6581T/V1,518 | 功能描述:調(diào)節(jié)器/解調(diào)器 RDS DEMODULATOR RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
| SAA6581T/V1H,512 | 功能描述:調(diào)節(jié)器/解調(diào)器 IC DEMODULATOR RDS/RBDS RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
| SAA6581T/V1H,518 | 功能描述:調(diào)節(jié)器/解調(diào)器 IC DEMODULATOR RDS/RBDS RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
| SAA6588 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:RDS/RBDS pre-processor |
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