TDA7420 Datasheet, PDF (7/29 Pages) STMicroelectronics – MULTIFUNCTIONAUDIO PROCESSOR

TDA7420
STEREO DECODER PART
ELECTRICAL CHARACTERISTICS (VS = 8.5V; de-emphasis time: T = 50µs; nominal MPX input volt-
age on pin 61 (composite): V_MPX = 0.5V_RMS (75KHz deviation); modulation frequency = 1KHz;
GI = 1.5dB; Tamb = 27°C; unless otherwise specified)
Symbol
SVRR
V_O
α
THD
S+N
N
Parameter
Supply Voltage Ripple Rejection
DC Output Voltage (HCL, HCR)
Channel Separation
Total Harmonic Distortion
Signal Plus Noise to Noise Ratio
Test Condition
V_RIPPLE = 100mV; f = 1KHz
V_SB - V_R = 100mV_DC
f = 20Hz to 16KHz;
S = 2V_RMS
Min. Typ. Max. Unit
50
65
dB
3.95 4.25 4.55
V
50
dB
0.02 0.3
%
91
dB
MONO/ STEREO SWITCH
V_INTH
Pilot Threshold Voltage
V_INTH
Pilot Threshold Voltage
for stereo ”ON” Pth = 1
Pth = 0
for stereo ”OFF” Pth = 1
Pth = 0
STEREO BLEND
V_SB-VR
Control Voltage for Channel
Separation
α = 6dB; (note 5)
α = 26dB;
HIGH CUT CONTROL
τ_deemp
De-Emphasis Time Constant
R_HCC
High Cut Control Resistance
C_L, C_R = 1nF; STDDS = 0
V_HCC - V_R = 100mV
C_L, C_R = 1nF; STDDS = 1
V_HCC - V_R = 100mV
V_HCC - V_R = 100mV; STDDS = 0
V_HCC - V_R = -0.5V (note 5)
VCO
f_OSC
∆f/f
Oscillator Frequency
Capture and Hold Range
CARRIER AND HARMONIC SUPPRESSION AT THE OUTPUT
α19
Pilot Signal f = 19KHz
α38
Subcarrier f = 38KHz
α57
Subcarrier f = 57KHz
α76
Subcarrier f = 76KHz
INTERMODULATION (note 1)
α2
f_mod = 10KHz; f_spur = 1KHz
α3
f_mod = 13KHz; f_spur = 1KHz
TRAFFIC RADIO (note 2)
α57
Signal f = 57KHz
SCA - SUBSIDIARY COMMUNICATIONS AUTHORIZATION (note 3)
α67
Signal f = 67KHz
ACI - ADJACENT CHANNEL INTERFERENCE (note4)
α114
Signal f = 114KHz
α190
Signal f = 190KHz
12
19
8
16
-300
43
64
43
115
0.5
40
16
26
14
22
-250
-80
50
75
50
150
456
1
55
75
62
90
65
75
70
75
95
84
22 mV_RMS
34 mV_RMS
20 mV_RMS
28 mV_RMS
-200 mV
mV
57
µs
86
µs
57
KΩ
185 KΩ
KHz
%
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
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