TDA5670-5X Datasheet, PDF (8/22 Pages) Siemens Semiconductor Group – Video Modulator for FM/AM-Audio with PLL-Output

TDA 5670-5X
AC/DC-Characteristics (cont’d)
T_A = 25 ^oC; V_S = 12 V
Parameter
Symbol
Limit Values
Unit
min. typ. max.
Test
Condition
Test
Circuit
Unmodulated video and audio carrier, measured with the spectrum analyzer as difference
between video carrier signal level and sideband signal level; loaded Q factor Q_L of the audio
oscillator resonance circuit adjusted by R_P to provide the required video to audio carrier ratio of
12.5 dB; Q_U = 25
Video to audio
carrier ratio
α_V/A
10
12.5 15
dB
f_VC+f_AC (5.5 MHz) 1
Harmonic wave ratio α_O
Harmonic wave ratio α_O
35
48
42
48
dB
f_VC + 2 f_AC
1
(11 MHz)
dB
f_VC + 3 f_AC
1
(16.5 MHz)
All remaining harmonic waves; multiple of fundamental wave of video carrier, without video
signal, measured with spectrum analyzer; f_VC = 523.25-623.25 MHz; pin 14 open
α
15
dB
1
Residual carrier
α_R
32
suppression
dB
Ch 30...40
3
Signal-to-noise in α_N/V
video; unmodulated
audio carrier
48
74
dB
Ch 30...40
4
Interference product
ratio audio in video
AM-modulation
α_A/V
49
62
dB
Ch 30...40,
4
FM-modulation of α_A/V
audio carrier
Unweighted AM-
α_V/A
Unweighted FM-
interference level
ratio video in audio
Signal-to-noise ratio
of audio oscillator
α_V/A
α_N/A
α_N/A
48
60
48
54
48
54
48
54
48
54
dB
Ch 30...40
4
m_A = 90%
dB
Ch 39; test
5
picture FuBK
dB
Ch 39; test
5
picture FuBK
dB
AM unmodulated 5
dB
FM-audio carrier 5
Video
Video input current –I₁₂
0
at pin 12
Video input voltage V₁₂
0.7
at pin 12
1
µA
C₁₂ ≤ 100 nF
1
1.4
Vpp C₁₂ ≤ 100 nF
1
Semiconductor Group
8