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| 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)： | 11/65頁 |
| 文件大小： | 610K |
| 代理商： | TDA7528 |
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TDA7528
Electrical characteristics
Doc ID 13141 Rev 6
Figure 5.
FM AGC - Controlled Voltage / current output
5.
Calibration mode
data byte FMAGC[3:0] = 0010
calibration mode for voltage output: The voltage Vthr can be switched directly to the
voltage output pin.
All other possible bit combinations of data byte FMAGC[3:0] are not recommended.
The voltage output can be configured as GPO.
The FMAGC2 output (voltage output) is short-circuit protected by a current limiter. The
FMAGC1 output (current output) needs an external resistor for current limitation. The
current output is voltage-tolerant up to VCC, the voltage output up to VDD.
The microcontroller can read the voltage at the AGC capacitor via the serial control
interface. On request of the microcontroller the measurement is done by applying the time
constant capacitor voltage to the central ADC (specified in chapter 3.10) and gives
information to calculate the AGC-attenuation.
The FM AGC system is controlled by a peak detector.
The Key AGC function is controlled by a D/A converter in the backend.
Vthr
Iout
Vout
Vthr
Iout
Vout
Vthr
Iout
Vout
Vthr
Table 8.
FM-AGC electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ
Max
Units
Lthr
Threshold RF level
Min. Threshold
Referred to mixer input
-
Mode 1 - high gain mixer
-
86
-
dB
μV
Mode 2 – low gain mixer
-
92
-
Max Threshold
Mode 1 - high gain mixer
-
100
-
Mode 2 – low gain mixer
-
106
-
Threshold steps
4 bit control
0.5
1
1.5
dB
-
Threshold error
30 to170 MHz @ 25 °C
-1.5
-
1,5
dB
-
Total threshold error
30.0 to 170.0 MHz
-3
-
3
dB
-
Temperature behavior of AGC
thresholds
0.011
-
dB/°C
-
Frequency range
-
30
-
170
MHz
-
Pin diode source current
(I
≈1.5 mA * (exp(V
DD-
VAGCTC)-1))
VAGCTC < 1V
(due to exponential behavior,
external resistor needed)
--
-10
mA
-
Pin diode sink current
(I
≈ 1 mA * (exp(V
AGCTC-
1.65V)-1))
VAGCTC = VDD
(due to exponential behavior,
external resistor needed)
3-
-
mA
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