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參數資料
| 型號： | UCB1200 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Advanced modem/audio analog front-end |
| 中文描述： | 先進的調制解調器/音頻模擬前端 |
| 文件頁數： | 24/54頁 |
| 文件大小： | 1052K |
| 代理商： | UCB1200 |
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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
相關PDF資料 |
PDF描述 |
|---|---|
| UCB1200BE | Advanced modem/audio analog front-end |
| UCB1300 | Advanced modem/audio analog front-end |
| UCB1300BE | Advanced modem/audio analog front-end |
| UCB1400BE | Audio codec with touch screen controller and power management monitor |
| UCB1400 | Audio codec with touch screen controller and power management monitor |
相關代理商/技術參數 |
參數描述 |
|---|---|
| UCB1200B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:UCB1200B |
| UCB1200BE | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Advanced modem/audio analog front-end |
| 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 |
| UCB1400 | 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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