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參數(shù)資料
| 型號： | 935264535557 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡 |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, PQFP208 |
| 封裝： | SOT-316, MQFP-208 |
| 文件頁數(shù)： | 7/23頁 |
| 文件大?。?/td> | 194K |
| 代理商： | 935264535557 |
1999 Jul 01
15
Philips Semiconductors
Product specication
Single Chip DAVIC/DVB-RC Cable Modem
VES1848
SYMBOL
PIN NUMBER
TYPE
DESCRIPTION
Iana
154
O
Analog output current for channel I. Iana is the output of the DAC
and can directly drive a single or double terminated 75
transmission line.
When parameter BB_IF=0 (AD.2) : I base band analog output.
When parameter BB_IF=1 (AD.2) : modulated IF analog output.
Qana
164
O
Analog output current for channel Q. Qana is the output of the DAC
and can directly drive a single or double terminated 75
transmission line.
When parameter BB_IF=0 (AD.2) : Q base band analog output.
When parameter BB_IF=1 (AD.2) : programmable sinewave
(B0.[7-0], B1.[7-0]) analog output.
CompI
153
I
An external .1
F bypass capacitor must be connected between this
pin and analog VDD to stabilize the internal current reference node
of the D/A converter of channel I.
CompQ
163
I
An external .1
F bypass capacitor must be connected between this
pin and analog VDD to stabilize the internal current reference node
of the D/A converter of channel Q.
IrefI
152
I
An external resistor of value 147
should be connected between
this pin and ground to provide good accurate bias currents for the
analog circuits on the DAC of channel I.
IrefQ
162
I
An external resistor of value 147
should be connected between
this pin and ground to provide good accurate bias currents for the
analog circuits on the DAC of channel Q.
VrefIQ
155
I
Voltage reference of 1.235V for both DAC.
AVDDI
151
I
DAC analog core power supply (3.3V)
AVSSI
156
I
DAC analog core ground.
VS0I
157
I
Ground for a P+ guard ring that surrounds the DAC (must be a clean
Vss)
VD0I
158
I
Power supply for an N- guard ring that surrounds the DAC (must be
a clean 3.3V)
VD1IQ
159
I
DAC digital core power supply (3.3V)
VS1IQ
160
I
DAC digital core ground.
AVSSQ
161
I
DAC analog core ground.
AVDDQ
165
I
DAC analog core power supply (3.3V)
VS0Q
166
I
Ground for a P+ guard ring that surrounds the DAC (must be a clean
Vss).
VD0Q
167
I
Power supply for an N- guard ring that surrounds the DAC (must be
a clean 3.3V).
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