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參數(shù)資料
| 型號： | TDA8740H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | Satellite sound circuit with noise reduction |
| 中文描述： | FM, AUDIO DEMODULATOR, PQFP44 |
| 封裝： | 10 X 10 X 1.75 MM, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 325K |
| 代理商： | TDA8740H |
October 1994
13
Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
TDA8740; TDA8740H
Notes
1.
At pin 20 (16) the demodulated 1 kHz signal should be present with a typical level of 158 mV (RMS) (
16 dBV), and
THD of maximum 0.5%; V
P
= 8 to 13.2 V; T
amb
=
20 to +70
°
C.
Modulation of main channel is OFF; modulation of secondary channels is ON.
The electrolytic capacitors at pins 40 and 42 (36 and 38) are removed and 1500 pF capacitors between pin 40 (36)
and ground and between pin 42 (38) and ground are connected. At pins 40 and 42 (36 and 38) the demodulated
1 kHz signals should be present with typical levels of 7 mV (RMS) and THD of maximum 0.5%; V
P
= 8 to 13.2 V;
T
amb
=
20 to +70
°
C.
All PLLs locked; R
S1
= R
S2
= 220 k
.
Modulation of secondary channel being measured and main channel is OFF; modulation of other secondary channel
is ON.
Modulation of main channel is ON; modulation of secondary channels is OFF.
Measured at pins 38 (34) (left) and 30 (26) (right) and no electrolytic capacitors connected to these pins.
2.
3.
4.
5.
6.
7.
Output selector control circuit (see also Table
2
) and main channel PLL lock-in select [MCS pin 7 (2)]; pins 15,
17, 26 and 13 (10, 13, 22 and 8) are MOS inputs and should not be left open-circuit
V
IL
V
IM
LOW level input voltage limits
MID level input voltage limits
for MCS pin only
MID level input voltage on
MCS pin if MCS pin is floating
HIGH level input voltage limits
low input resistance MCS pin
to ground
high input resistance MCS pin
to V
P
LOW level input current
(not MCS pin)
HIGH level input current
(not MCS pin)
0
1.8
1.2
2.8
V
V
V
IMF
V
P
must be 10.8 to 13.2 V
17
19
21
%V
P
V
IH
R
IL
3.5
12
19
V
P
26
V
k
R
IH
52
80
108
k
I
IL
V
IL
= 0 V
<
1
μ
A
I
IH
V
IH
= 5 V
<
1
μ
A
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
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