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(yè)數(shù)： 18/65頁(yè)
文件大小： 610K
代理商： TDA7528
TDA7528
Electrical characteristics
Doc ID 13141 Rev 6
external feedback to pin GP4/UDS. This mode can only be used with an external
LNA.
4.
Calibration mode for voltage output
a)
internal feedback
data byte AMAGC[3:0] = 1110
calibration mode for voltage output (mode 3.a.): the voltage Vthr can be switched
directly to the voltage output pin. The reference voltage is programmable in the
range described in 3.a.
b)
external feedback
data byte AMAGC[3:0] = 0010
calibration mode for external feedback (mode 3.b.): the output voltage is set to a
value, that the feedback on GP4(UDS is equal to Vthr. The reference voltage is
programmable in the range described in 3.b.
All other possible bit combinations of data byte AMAGC[3:0] are prohibited.
The voltage output can be configured as GPO.
The AMAGC2 output (voltage output) is short-circuit protected by a current limiter. The
AMAGC1 output (current output) needs an external resistor. The current output is voltage-
tolerant up to VCC, the voltage output up to VDD.
The microcontroller (STA3005 backend) can read the voltage at the AGC capacitor via the
serial control interface. On the microcontroller request, the measurement is done by
connecting the time constant capacitor to the central ADC (specified in chapter 3.10); the
information can be used to calculate the AGC attenuation.
The AM AGC system is controlled by an average detector.
The AM AGC can be enabled independently in AM and FM mode
Table 12.
AM-AGC electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ
Max
Units
Lthr
Threshold RF level
Min. Threshold
Referred to mixer input
-
AM mixer input
-
89
-
dBV
AM filter input
-
94
-
dBV
Max Threshold
AM mixer input
-
101.5
-
dBV
AM filter input
-
106.5
-
dBV
-
Threshold steps
4 bit control
0.4
0.9
1.4
dB
-
Absolute threshold error
0.5 to 30.0 MHz @ 25 °C
-1
-
2
dB
-
Total threshold error
0.5 to 30.0 MHz
-2
-
3
dB
-
Absolute threshold error
0.1 to 0.5 MHz @ 25 °C
-0.5
-
3
dB
-
Total threshold error
0.1 to 0.5 MHz
-2
-
3.5
dB
-
Temperature drift of AGC
thresholds
-
0.011
-
dB/°C
-
Frequency range
Reduced performance
0.05
-
0.1
MHz
-
frequency range
-
0.1
-
30
MHz
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