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參數(shù)資料
| 型號： | TDA7529 |
| 廠商： | 意法半導體 |
| 英文描述： | RF front-end for AM/FM DSP car-radio with IF sampling |
| 中文描述： | RF前端的調幅/調頻DSP的汽車無線電IF采樣 |
| 文件頁數(shù)： | 12/60頁 |
| 文件大?。?/td> | 437K |
| 代理商： | TDA7529 |
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Function description
TDA7529
12/60
3
Function description
3.1
IMR Mixer and active balun output
The IMR mixer has two FM inputs (referred as mode 1 / mode 2) and one AM input
selectable by software. The FM inputs differ by their gains, noise figures, IIP3 and maximum
signal handling capability. The mode 1 FM input (with the higher gain, lower IIP3 and lower
noise figure) is normally coupled with passive antenna input stages; the mode 2 FM input is
normally used for input stages featuring an external preamplifier.
There are two single ended outputs of the IMR mixer: Balunout1 has a 4 dB higher gain than
Balunout2. It is not recommended to use both outputs in parallel.
The Balun1 pin is the current mixer output over an internal resistor. The LC filter at Balun1
can be realized with a low cost SMD-coil (Q ~ 4).
3.2
FM RF-AGC
The FM AGC system is controlled by a peak detector, whose gain can be varied by the
keyed AGC. The latter function is meant to be controlled by a D/A converter in the back-end
part of the system.
The time constant of the FM RF-AGC is defined by an external capacitor connected to
TCFM and programmable internal currents. The currents can be selected independently for
AGC attack and decay. By this the ratio between the attack and the decay time can be
programmed between 0.4 and 250.
The FM RF-AGC has two output pins to drive one PIN diode attenuator and the external
preamplifier gain control.
The AGC outputs can be programmed to the following modes:
1.
Positive current I=f(e): after reaching the AGC threshold voltage, the current output
delivers a current I=f(e) up to 15mA in a voltage range from 0.1V (@10μA sink current)
up to V
CC
-1.2V with a quasi-exponential characteristic referred to the voltage at TCFM.
Figure 3.
Positive current diagram
2.
Pos/neg current I = f(e): below the AGC threshold voltage the AGC output sinks a
constant current of -5 mA. When the RF input level crosses the AGC threshold voltage,
the current is reduced down to 0 mA with a quasi-logarithmic behavior. At half control
voltage the current becomes positive and reaches up to 15mA following an exponential
function.
V_TCFM
Iout
15mA
f(e) current
AC00040
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相關代理商/技術參數(shù) |
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| 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 |
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| TDA7535013TR | 功能描述:音頻數(shù)/模轉換器 IC 20-bit Stereo DAC RoHS:否 制造商:Texas Instruments 轉換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
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