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參數(shù)資料
| 型號： | AS5502 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 調(diào)制器/解調(diào)器 |
| 英文描述： | Multimode Powerline-Modem |
| 中文描述： | 2.4 kbps DATA, MODEM, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 18/26頁 |
| 文件大?。?/td> | 315K |
| 代理商： | AS5502 |
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Mux-State 1(IF-Test):
In this mode the IFBPF can be measured by forcing the IFI via pin TST-IN and measuring
IFO via pin TST-OUT. With pin CKSYS the FSK-ZC signal can be measured.
Mux-State 2 (TXPATH / RXO):
In this mode the TXPATH can be measured by forcing TXI via pin TST-IN and measuring
the TX-Output-Stage output. The SC-CLK can be measured via pin CKSYS. The receiver
bandpass filter can be measured by forcing RXIN and measuring TST-OUT (RXO).
Mux-State 3 (DPLL / DATAFIL):
In this mode the input of the RX-DPLL can be forced by TST-IN for digital verification of
this block. Further the output of the data LP-filter can be measured at TST-OUT. The
MIXER- PLL output can be measured via pin CKSYS.
TX Timeout / RES-Delay Test-Mode: With bit "Test2" set to 1 the TX-timeout (3sec) and
the RES-Delay (300ms) gets reduced by a factor of 256 for production test.
ASYN Test-Mode: The contol-bit "ASYN" is used for global verification of the
receiver-block and especially for verification of the MIXER and the DataFilter by measuring
the RXDA-jitter (isochronous-distortion).
TST-OUT
op
MUX
VREF
IFO
RXO
MUX
TST-IN
IFI
TXI
1
2
1
2
3
0
nc.
0
DPLL-IN
3
op
DFO
1.5 Supply and Analog Ground
There are two different pairs of supply pins, one for analog (AVSS,AVDD) and one for
digital (DVSS, DVDD). The two VSS-pins have to be at the same level to avoid
substrate-current. The two VDD-pins should not differ more than 0.25V. The reason for
splitting the supply lines is to avoid noise from the digital circuit injected to the analog
section.
The analog-ground is generated by resistive division of the supply-voltage to AVDD/2. Since
the SC-clock is working in the range of >1MHz, an external capacitor of 1uF is needed to
decouple the AGND to AVSS.
There has to be sufficient decoupling from AVDD to AVSS and from DVDD to DVSS
separately. Usually a combination of a 10uF tantal and 100nF ceramic-capacitor is used
dependent on the supply structure.
AVSS
AGND
AVDD
DVDD
DVSS
1uF
100n
10uF
10uF
100nF
+5V
+5V
0V
AS5501 / AS5502 Multimode Powerline Modem
Data Sheet
Rev A, May 2000
Page 17/25
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