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參數資料
| 型號： | UCB1300 |
| 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： | 25/56頁 |
| 文件大小： | 1022K |
| 代理商： | UCB1300 |
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1999 Jul 20
25
Philips Semiconductors
Preliminary specification
Advanced modem/audio analog front-end
UCB1300
ON-CHIP REFERENCE CIRCUIT
The UCB1300 contains an on chip reference voltage source, which generates the reference voltages for the 10 bit ADC
and the virtual analog ground. Alternatively the UCB1300 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.When
choosing a capacitor, the internal impedance (around 50k
) should be taken into account.
An external voltage reference connected to the VREFBYP pin is used as voltage reference by the UCB1300 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 UCB1300 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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相關代理商/技術參數 |
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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 |
| UCB1400BE,128 | 功能描述:接口—CODEC AUDIO CODEC WITH TOUCHSCREEN RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| UCB1400BE,151 | 功能描述:接口—CODEC AUDIO CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
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