參數(shù)資料
型號(hào)： TDA7528
廠商： STMICROELECTRONICS
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： 10 X 10 MM, 1.40 MM HEIGHT, ROHS COMPLIANT, LQFP-64
文件頁數(shù)： 6/65頁
文件大?。?/td> 610K
代理商： TDA7528
Electrical characteristics
TDA7528
Doc ID 13141 Rev 6
3.3
Power management and voltage regulator
The TDA7528 has a single 5 V supply. The 3.3 V supply for the VCO must be derived from
an external NPN transistor controlled by the internal voltage regulator. It is also possible to
use an external 3.3 V regulator. In this case, special care has to be taken on this 3.3V .
3.3.1
Power management
The TDA7528 detects whether all the voltages are high enough and stable when the
operating power supply is applied. The power-on reset is tripped and all the control registers
are set to "low" if this condition is not met.
As long as the voltages remain within the permissible range, the SPI/I2C interface is active
(in the I2C mode this can be detected by the
μP through the acknowledge signal on every
communication with the bus master).
The SPI-/I2C interface is in power-on mode when the operating voltage is applied to the
TDA7528.
The following function groups can be switched on/off via SPI/I2C:
●
PLL {divider R, N and V, PFD, charge pump, VCO1 (3,7 GHz-VCO) or VCO2 (4,7 GHz-
VCO), Reference-Oscillator or LVDS input buffer}
●
FM/AM-mixer and active balun, FM-AGC
●
D/A-converter_1
●
D/A-converter_2
●
AM-LNA
●
AM-low pass filter
●
AM-AGC
●
IF-section {IF-amplifier, anti-aliasing-filter, IF-AGC}
●
GPIO
●
temperature-sensor,
●
Sensor ADC
3.3.2
Power-on circuit and low supply voltage detector
Power-on circuit:
The power-on circuit produces a reset whenever one of the following voltages is below it's
POR level. (BIASD1, BIASD2 < 1.2 V; VDDPLL < 2.4V; VCCIF < 3.8 V)
Low supply voltage detector:
The "PWR_STABLE_read" status bit has the value "0" after power on. This bit is set to "1"
by an SPI/I2C write command from the microcontroller in initialization communication to the
"PWR_STABLE_write" bit. The microcontroller cannot reset the "PWR_STABLE_read" bit. A
"0" transmitted in the "PWR_STABLE_write" bit has no effect.
If the power supply falls below the programmed threshold all registers are set to their power-
on default, including that the "PWR_STABLE_read" bit is set to "0". By this the
microcontroller can verify at any time whether a critical drop in voltage (value "0") has taken
place since the last TDA7528 read out of this bit. The threshold voltage can be calibrated
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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TDA7529 功能描述:調(diào)諧器 RF front-end AM/FM DSP car-radio IF Sig RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
TDA7529_11 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:RF front-end for AM/FM DSP car-radio with IF sampling
TDA7529TR 功能描述:調(diào)諧器 RF front-end AM/FM DSP car-radio IF Sig RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
TDA7535 功能描述:數(shù)模轉(zhuǎn)換器- DAC Delta/sigma cascade 20 bit stereo DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube
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