TDA7528 STMicroelectronics, TDA7528 Datasheet - Page 18

• Manufacturer Part Number: TDA7528
• Description: IC FRONT END MODULE CAR 64-LQFP
• Manufacturer: STMicroelectronics

Specifications of TDA7528

• Frequency: 50kHz ~ 108MHz, 161MHz ~ 163MHz
• Modulation Or Protocol: AM, FM
• Applications: Automotive Audio
• Current - Receiving: 175mA
• Data Interface: PCB, Surface Mount
• Voltage - Supply: 3.3V, 5V
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 64-LQFP
• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Operating Temperature Classification: Automotive
• Package Type: LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Sensitivity: -
• Memory Size: -
• Data Rate - Maximum: -
• Antenna Connector: -
• Lead Free Status / Rohs Status: Compliant

Electrical characteristics
3.4.2
18/65
FM AGC
The time constant of the FM AGC is defined by an external capacitor and the programmable
internal currents (details given in the
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.
Figure 3.
2.
Figure 4.
3.
4.
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 V
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.
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.
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.
FM AGC - Controlled current output mode 1
FM AGC - Controlled current output mode 2
15mA
15mA
Iout
Iout
Doc ID 13141 Rev 6
15m
15m
15m
A
A
A
Iout
Iout
Iout
f(e) current
f(e) current
f(e) current
Table
f(e) - current
f(e) - current
f(e) - current
8). The currents can be selected independently
1.65V
1.65V
1.65V
V_TCAGCFM
V_TCAGCFM
CC
TDA7528
-1.5 V.