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)： 22/65頁(yè)
文件大?。?/td> 610K
代理商： TDA7528
TDA7528
Electrical characteristics
Doc ID 13141 Rev 6
3.6.2
IF-AGC
The IF AGC system is controlled in AM with an average detector and in FM with a peak
detector.
The time constant is defined with two external capacitors and programmable internal
currents (details given in the table below).
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.
Table 14.
IF-AGC electrical characteristics
Symbol
Parameter
Test condition
Min.
Typ
Max
Units
Lthr
AGC threshold IF level
Referred to differential output of
ADC buffer
--
-
Min. AGC threshold
FM
-
105
-
dBV
AM
-
99
-
dBV
Max AGC threshold
FM, Max. recommended AGC
threshold 115 dBV
-119
-
dBV
AM, Max. recommended AGC
threshold 109 dBV
-113
-
dBV
-
Threshold steps
3 bit
1.5
2
2.5
dB
-
Absolute threshold error
10.7 MHz @ 25 °C (up to
117 dBV output voltage)
-1
-
1
dB
-
Total threshold error
10.7 MHz (up to 117dB V
output voltage)
-2.5
-
2.5
dB
-
Temp drift of AGC threshold
FM-mode
AM mode
-
0.008
0.0
dB/°C
-
IF gain deviation
Remaining gain control error
-
1
dB
-
Fast attack mode in AM-mode
Active if control deviation is
more than 7dB
0.3
0.5
1
ms
-
Time constant in AM mode(1)
symmetric behavior (attack =
decay)
With external 2.2 F capacitor,
IF gain = 31 dB input 1-3; 24 dB
input4
mode S1 (slow)
mode S2 (fast)
55
5.5
110
11
220
22
ms
-
Time constant in FM mode(2)
asymmetric behavior
With external 220 nF capacitor,
IF gain = 31 dB input1-3; 24 dB
input4
decay mode U1 / U2
attack mode U1 (slow)
attack mode U2 (fast)
7
150
30
15
300
60
32
600
120
ms
s
1.
The AGC time constant for AM is the 1
τ value, means when the AGC is settled to 63% after a 6dB step
2.
The AGC time constant for FM is the time needed to settle the AGC to 90% for a 6dB level step
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