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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)： | 10/65頁 |
| 文件大小： | 610K |
| 代理商： | TDA7528 |
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Electrical characteristics
TDA7528
Doc ID 13141 Rev 6
3.4.2
FM AGC
The time constant of the FM AGC is defined by an external capacitor and the programmable
internal currents (details given in the Table 8). The currents can be selected independently
for AGC attack and decay. By this a symmetrical behavior rather than a 2...250 times faster
attack behavior can be programmed.
Control behavior:
The FM-RF-AGC is realized with two output pins which control the gain of the corresponding
pre-stage.
The control behavior can be programmed to the following modes:
1.
Controlled current output mode 1
data byte FMAGC[3:0] = 1000
positive current I = f(e): after reaching the AGC threshold voltage the current output
delivers a current I = f(e) up to -15 mA in a voltage range from 0.2V up to VCC-1.5 V.
Figure 3.
FM AGC - Controlled current output mode 1
2.
Controlled current output mode 2
data byte FMAGC[3:0] = 1100
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 0mA with a quasi-log. behavior. At half control voltage the current becomes
positive and reaches up to -15 mA following an exponential function.
Figure 4.
FM AGC - Controlled current output mode 2
3.
Constant current mode
data byte FMAGC[3:0] = 0100
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.
4.
Controlled Voltage / current output
data byte FMAGC[3:0] = 1011
voltage and current mode with hand-over: the Vthr level is programmable in the range
of 0.2 V to 2.6 V.
Iout
15mA
V_TCAGCFM
f(e) current
Iout
15mA
V_TCAGCFM
f(e) current
Iout
15m
A
1.65V
f(e) - current
Iout
15m
A
1.65V
f(e) - current
Iout
15m
A
1.65V
f(e) - current
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