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參數(shù)資料
| 型號： | TDA7529TR |
| 廠商： | 意法半導(dǎo)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(diào)幅/調(diào)頻DSP的汽車無線電IF采樣 |
| 文件頁數(shù)： | 13/60頁 |
| 文件大?。?/td> | 437K |
| 代理商： | TDA7529TR |
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TDA7529
Function description
13/60
Figure 4.
Positive/negative current diagram
3.
Constant current mode: the output current can be set to 2 mA source current. The AGC
detector is in power -down mode and only the PIN diode driver is active.
Voltage and current mode with hand-over: the Vthr level is programmable with 6 bit in
the range of 0.2V to 2.56V. The voltage Vthr is the internal reference voltage of an
external cascode transistor emitter feedback loop.
4.
Figure 5.
Voltage and current mode with hand-over
The voltage output swing is comprised between 0V and 3.3V (VDD).
The microcontroller can read the voltage at the AGC capacitor via the serial control
interface.
3.3
AM RF-AGC
The AM AGC system is controlled by an average detector. The time constant of the AM RF-
AGC is defined by an external capacitor connected to TCAM and programmable internal
currents with symmetrical attack/decay behavior.
The AM 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 same modes as the FM RF-AGC with the
exception of pos/neg current.
The microcontroller can read the voltage at the AGC capacitor via the serial control
interface.
1.65V
Iout
15mA
f(e) current
AC00041
Iout Vout
Vthr
Vthr
AC00042
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