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參數(shù)資料
| 型號： | TDA7420 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 14 X 14 MM, TQFP-64 |
| 文件頁數(shù)： | 28/29頁 |
| 文件大小： | 230K |
| 代理商： | TDA7420 |
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NOTES TO THE CHARACTERISTICS
1 INTERMODULATION SUPPRESSION
α2 =
VO (signal)(at1KHz)
VO
(spurious)(at1KHZ)
;fs = (2 x 10KHz) - 19KHz
α3 =
VO
(signal)(at1KHz)
VO
(spurious)(at1KHZ)
;fs = (3 x 13KHz) - 38KHz
measured with : 91% mono signal; 9% pilot signal; fm=10KHz or 13KHz.
2. TRAFFIC RADIO (V.F.) suppression
α57 (V.W.F.)=
VO(signal)
(at1KHz)
VO
(spurious)(at1KHZ ±23Hz)
measured with : 91% stereo signal; 9% pilot signal; fm=1KHz; 5% subcarrier
(f=57KHz, fm = 23Hz AM, m = 60%)
3. SCA (SUBSIDIARY COMMUNICATIONS AUTHORIZATION)
α67 =
VO(signal) (at1KHz)
VO
(spurious)(at9KHZ)
;fs = (2 x 38KHz) - 67KHz
measured with : 81% mono signal; 9% pilot signal; fm=1KHz;
10% SCA - subcarrier (fs = 67KHz, unmodulated).
4. ACI (ADJACENT CHANNEL INTERFERENCE)
α114 =
VO(signal) (at1KHz)
VO
(spurious)(at4KHZ)
;fs = 110KHz - (3 x 38KHz)
α190 =
VO(signal) (at1KHz)
VO
(spurious)(at4KHZ)
;fs = 186KHz - (5 x 38KHz) -
measured with 90% mono signal; 9% pilot signal; fm = 1KHz; 1% spurious signal
(fs = 110KHz or 186KHz, unmodulated).
5: Control range for High Cut Control and Stereo Blend is VR - 400mV
≤ VSB,VHCC ≤VR
-500
-400
-300
-200
-100
0 VHCC-VR
0
1
2
3
fc
(KHz)
D94AU183
Figure : High Cut Control
-400
-300
-200
-100
VSB -VR
0
10
20
30
40
SEP
(dB)
D94AU184
Figure : Stereo Blend
TDA7420
8/29
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