TDA8722 Datasheet, PDF (10/28 Pages) NXP Semiconductors – I2C-bus programmable modulator for negative video modulation and FM sound

Philips Semiconductors
I²C-bus programmable modulator for
negative video modulation and FM sound
Product specification
TDA8722
CHARACTERISTICS
V_DDA = V_DDD = 5 V; T_amb = 25 °C; valid over the whole UHF band; measured in circuit of Fig.7;
unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
Supply
I_DD
supply current
normal mode
RF off test mode
41
52
63
mA
30
38
46
mA
Video characteristics
I₁₉
input current (AC)
z₁₉
video input impedance
m
modulation depth
V₁₉ = 3.2 V
−
0.5
V₁₉ = 3.2 V
30
−
V₁₉ = 500 mV (p-p) EBU 77
82
colour bars; R17 = 120 kΩ;
see Fig.7
during clipping condition; 85
−
note 1
∆m
modulation depth range
TPSG mode;
R17 = 120 kΩ
72
82
balance test mode;
R17 = 120 kΩ
110 −
V₁₉ = 500 mV (p-p) EBU 65
−
colour bars;
47 kΩ ≤ R17 ≤ ∞
∆m_APL variation of modulation depth with
referenced to the value for −2
−
change of APL between 10 and 90% APL = 50%;
V₁₉ = 500 mV (p-p)
V_clip(p-p) video input level where clipping starts video level on pin 19;
−
0.56
(peak-to-peak value)
note 2
S/N video video signal-to-noise ratio
G_diff
differential gain
φ_diff
differential phase
V/S
video-to-sync ratio
f_RF < 700 MHz; note 3
f_RF > 700 MHz; note 3
note 4
note 4
V₁₉ = 500 mV (p-p);
V/S = 7/3
48
52
46
50
−8
−
−8
−
6.9/3.1 7/3
f_video
frequency response for the video signal note 5
−1
−
Audio characteristics (for PAL G standard; audio subcarrier at 5.5 MHz)
Z₁
audio input impedance
δm
modulation deviation
30
−
f₁ = 400 Hz;
20
25
V₁ = 0.5 V (RMS) before
pre-emphasis filter
δm_max
maximum modulation deviation
f₁ = 400 Hz;
60
85
V₁ = 2.0 V (RMS) before
pre-emphasis filter
THD
total harmonic distortion
f₁ = 1 kHz;
−
0.4
V₁ = 0.5 V (RMS) before
pre-emphasis filter
2.0
µA
−
kΩ
87
%
98
%
92
%
−
%
90
%
+2
%
−
V
−
dB
−
dB
+8
%
+8
deg
7.1/2.9
+1
dB
−
kΩ
30
kHz
−
kHz
1.5
%
1998 Jun 23
10