TDA7420 datasheet(7/29 Pages) STMICROELECTRONICS

部件名	TDA7420

功能描述	MULTIFUNCTIONAUDIO PROCESSOR

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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7 / 29 page

STEREO DECODER PART

ELECTRICAL CHARACTERISTICS (VS = 8.5V; de-emphasis time: T = 50

µs; nominal MPX input volt-

age on pin 61 (composite): VMPX = 0.5VRMS (75KHz deviation); modulation frequency = 1KHz;

GI = 1.5dB; Tamb =27

°C; unless otherwise specified)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

SVRR

Supply Voltage Ripple Rejection

VRIPPLE = 100mV; f = 1KHz

50

65

dB

VO

DC Output Voltage (HCL, HCR)

3.95

4.25

4.55

V

α

Channel Separation

VSB -VR = 100mVDC

50

dB

THD

Total Harmonic Distortion

0.02

0.3

%

S

+ N

N

Signal Plus Noise to Noise Ratio

f = 20Hz to 16KHz;

S=2VRMS

91

dB

MONO/ STEREO SWITCH

VINTH

Pilot Threshold Voltage

for stereo ”ON” Pth =1

Pth =0

12

19

16

26

22

34

mVRMS

VINTH

Pilot Threshold Voltage

for stereo ”OFF” Pth =1

Pth =0

8

16

14

22

20

28

mVRMS

STEREO BLEND

VSB-VR

Control Voltage for Channel

Separation

α = 6dB; (note 5)

-300

-250

-200

mV

α = 26dB;

-80

mV

HIGH CUT CONTROL

τdeemp

De-Emphasis Time Constant

CL,CR = 1nF; STDDS = 0

VHCC -VR = 100mV

43

50

57

µs

CL,CR = 1nF; STDDS = 1

VHCC -VR = 100mV

64

75

86

µs

RHCC

High Cut Control Resistance

VHCC -VR = 100mV; STDDS = 0

43

50

57

K

Ω

VHCC -VR = -0.5V (note 5)

115

150

185

K

Ω

VCO

fOSC

Oscillator Frequency

456

KHz

∆f/f

Capture and Hold Range

0.5

1

%

CARRIER AND HARMONIC SUPPRESSION AT THE OUTPUT

α19

Pilot Signal f = 19KHz

40

55

dB

α38

Subcarrier f = 38KHz

75

dB

α57

Subcarrier f = 57KHz

62

dB

α76

Subcarrier f = 76KHz

90

dB

INTERMODULATION (note 1)

α2fmod = 10KHz; fspur = 1KHz

65

dB

α3fmod = 13KHz; fspur = 1KHz

75

dB

TRAFFIC RADIO (note 2)

α57

Signal f = 57KHz

70

dB

SCA - SUBSIDIARY COMMUNICATIONS AUTHORIZATION (note 3)

α67

Signal f = 67KHz

75

dB

ACI - ADJACENT CHANNEL INTERFERENCE (note4)

α114

Signal f = 114KHz

95

dB

α190

Signal f = 190KHz

84

dB

TDA7420

7/29

类似零件编号 - TDA7420

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