參數(shù)資料
型號(hào)： UCB1200BE
廠商： NXP SEMICONDUCTORS
元件分類： 調(diào)制器/解調(diào)器
英文描述： Advanced modem/audio analog front-end
中文描述： MODEM-SUPPORT CIRCUIT, PQFP48
封裝： 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, SOT-313-2, LQFP-48
文件頁(yè)數(shù)： 24/54頁(yè)
文件大?。?/td> 1052K
代理商： UCB1200BE
1998 Jul 22
24
Philips Semiconductors
Product specification
Advanced modem/audio analog front-end
UCB1200
ON-CHIP REFERENCE CIRCUIT
The UCB1200 contains an on chip reference voltage source, which generates the reference voltages for the 10 bit ADC
and the virtual analog ground. Alternatively the UCB1200 can be driven from an external reference voltage source.
The internal reference voltage is connected to the VREFBYP pin, where an external capacitor could be connected to filter
this reference voltage, if VREF_CON (register 10) is set. THIS IS NOT RECOMMENDED since the internal impedance
of the reference (several 100M
) will be sensitive to board leakage and the turn on time constant will be very long.
An external voltage reference connected to the VREFBYP pin is used as voltage reference by the UCB1200 circuit, if the
EXT_REF_ENA bit (register 10) is set. Two bits in the ADC control register determine the mode of operation of this
reference voltage circuit. VREFBYP_CON connects the internal reference voltage to the VREFBYP pin, while
EXT_VREF_ENA disables the internal reference voltage and switches the UCB1200 into the external voltage reference
mode.
Fig.19 Block diagram of the reference circuit.
&
&
aud_in_ena
aud_out_ena
tel_in_ena
tel_out_ena
tsc_bias_ena
adc_en
ext_vref_ena
internal
bandgap
reference
voltage
circuitry
ena
Vbg
vrefbyp_con
internal
analog
ground
internal
ADC
reference
vrefbyp
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UCB1300 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced modem/audio analog front-end
UCB1300BE 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced modem/audio analog front-end
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UCB1400BE 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Audio codec with touch screen controller and power management monitor
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