參數(shù)資料
型號(hào)： VES1848
廠商： NXP SEMICONDUCTORS
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Single Chip DAVIC/DVB-RC Cable Modem(單片DAVIC/DVB-RC電纜調(diào)制解調(diào)器)
中文描述： SPECIALTY TELECOM CIRCUIT, PQFP208
封裝： MQFP-208
文件頁(yè)數(shù)： 14/20頁(yè)
文件大?。?/td> 122K
代理商： VES1848
1999 Jul 01
14
Philips Semiconductors
Product specification
Single Chip DAVIC/DVB-RC Cable Modem
VES1848
SYMBOL
aleA
PIN NUMBER
185
TYPE
I
DESCRIPTION
application layers interface Address Latch Enable (only for
multiplexed micro-processor).
IF analog OOB input signal. Positive input to the A/D converter. This
pin is DC biased to half-supply through an internal resistor divider (2
x 10k
resistors). In order to remain in the range of the ADC, the
voltage difference between pins VIP and VIM should be between
-0.5 and 0.5 volts.
IF analog OOB input signal. Negative input to the A/D converter.
This pin is DC biased to half-supply through an internal resistor
divider (2 x 10k
resistors). In order to remain in the range of the
ADC, the voltage difference between pins VIP and VIM should be
between -0.5 and 0.5 volts.
This pin is connected to a tap point on an internal resistor divider
used to create CMO and CMI. An external capacitor of value .1
μ
f
should be connected between this point and ground to provide good
power supply rejection from the positive supply at higher
frequencies.
An external resistor of value 3.3k
should be connected between
this pin and ground to provide good accurate bias currents for the
analog circuits on the ADC.
This is the output of an on-chip resistor divider. An external
capacitor of value .1
μ
f should be connected between this point and
ground to provide good power supply rejection from the positive
supply at higher frequencies. Reference voltages VREFP and
VREFM are derived from the voltage on VREF.
This is a positive voltage reference for the A/D converter. It is
derived from the voltage on pin VREF through an on-chip fully-
differential amplifier. The voltage on this pin is nominally equal to
CMO + 0.25 volts.
This is the negative voltage reference for the A/D converter. It is
derived from the voltage on pin VREF through an on-chip fully-
differential amplifier. The voltage on this pin is nominally equal to
CMO - 0.25 volts.
This pin provides the common-mode out voltage for the analog
circuits on the ADC. It is the buffered version of a voltage derived
from an on-chip resistor devider, and has a nominal value of 0.5 x
VD3.
This pin provides the common-mode in voltage for the analog
circuits on the ADC. It is the buffered version of a voltage derived
from an on-chip resistor devider, and has a nominal value of 0.75 x
VD3.
Power supply input for the digital switching circuitry (3.3V typ).
Ground return for the digital switching circuitry.
Power supply input for the analog clock drivers (3.3V typ).
Ground return for the analog clock drivers.
Power supply input for the analog circuits (3.3V typ).
Ground return for analog circuits.
Power supply input connected to an n-well guard ring that surrounds
the ADC (3.3V typ).
Ground for a p+ guard ring that surrounds the ADC.
VIP
118
I
VIM
117
I
CMCAP
111
I
RBIAS
108
I
VREF
114
O
VREFP
113
O
VREFM
112
O
CMO
110
O
CMI
109
O
VD1
VS1
VD2
VS2
VD3
VS3
VD4
107
106
120
119
115
116
121
I
I
I
I
I
I
I
VS4
105
I
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