TDA8295
Digital global standard low IF demodulator for analog TV and
FM radio
Rev. 01 — 4 February 2008
Product data sheet
1. General description
The TDA8295 is an alignment-free digital multistandard vision and sound low IF signal
PLL demodulator for positive and negative video modulation including AM and FM mono
sound processing. It can be used in all countries worldwide for M/N, B/G/H, I, D/K,
L and L-accent standard. CVBS and SSIF/mono audio is provided via two DACs. FM radio
preprocessing is included for simple interfacing with demodulator/stereo decoder
backends.
The IC is especially suited for the application with the NXP Silicon Tuner TDA8275A or
TDA1827x.
All the processing is done in the digital domain.
The chip has an ‘easy programming’ mode to make the I
2
C-bus protocol very simple. In
principle, only one bit sets the proper standard with recommended content. However, if
this is not suitable, free programming is always possible.
2. Features
I
Digital IF demodulation for all analog TV standards worldwide (M/N, B/G/H, D/K, I,
L and L-accent standard)
I
Multistandard true synchronous demodulation with active carrier regeneration
I
Alignment-free
I
16 MHz typical reference frequency input (from low IF tuner) or operating as crystal
oscillator
I
Internal PLL synthesizer which allows the use of a low-cost crystal (typically 16 MHz)
I
Especially suited for the NXP Silicon Tuner TDA8275A or TDA1827x
I
No SAW filter needed
I
Low application effort and external component count in combination with the
TDA8275A or TDA1827x
I
Pin compatible with predecessor TDA8290
I
Simple upgrade of TDA8290 possible
I
12-bit IF ADC on chip running with 54 MHz or 27 MHz
I
Two 10-bit DACs on chip for CVBS and SSIF or audio
I
Easy programming for I
2
C-bus
I
High flexibility due to various I
2
C-bus programming registers
I
I
2
C-bus interface and I
2
C-bus feed-through for tuner programming
I
Four I
2
C-bus addresses selectable via two external pins
NXP Semiconductors
TDA8295
Digital global standard low IF demodulator for analog TV and FM radio
I
Gated IF AGC acting on black level by using H/V PLL or peak IF AGC (I
2
C-bus
selectable)
I
Internal digital logarithmic IF AGC amplifier with up to 48 dB gain and 68 dB control
range
I
Peak search tuner IF AGC for optimal adaptive drive of the IF ADC
I
Switchable IF PLL and IF AGC loop bandwidths
I
Precise AFC and lock detector
I
Accurate group delay equalization for all standards
I
Very robust IF demodulator coping with adverse field conditions
I
Wide PLL pull-in range up to
±1660
kHz (I
2
C-bus selectable)
I
CVBS and SSIF or audio output with simple postfilter (capacitor only)
I
CVBS gain levelling stage to provide nearly constant signal amplitude during
overmodulation
I
Video equalizer with eight settings
I
Nyquist filter in video baseband
I
Excellent video S/N (typically 62 dB weighted)
I
High selectivity video low-pass filter for all standards
I
Low video into sound crosstalk
I
Sound performance comparable to QSS single reference concepts
I
AM/FM mono sound demodulator
I
Switchable de-emphasis
I
Excellent FM sound
I
Good AM sound
I
High FM Deviation mode for China
I
Preprocessing of FM radio (mono and stereo) with highly selective digital band-pass
filter
I
No ceramic filter or external components needed for FM radio
I
FM radio available in mono
I
Automatic or forced mute for mono sound
I
Automatic or forced blank for video
I
Mostly digital FIR filter implementation (NSC notches and video low-pass filters)
I
Three GPIO pins
I
Low total power dissipation (typically 324 mW)
I
Standby mode (typically 7 mW)
I
40-pin HVQFN package
I
CMOS technology (0.12
µm
1.2 V and 3.3 V)
3. Applications
I
PC TV applications
I
DVD recorders
TDA8295_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 4 February 2008
2 of 77
NXP Semiconductors
TDA8295
Digital global standard low IF demodulator for analog TV and FM radio
4. Quick reference data
Table 1.
Quick reference data
Power supplies 3.3 V, 1.2 V; T
amb
= 25
°
C; PC / SC1 for L and M = 10 dB, all others 13 dB; residual picture carrier for L = 3 %,
all others 10 %; FM/AM modulation = 54 %, 1 kHz modulation frequency; measured in application PCB (see
Figure 12)
with
16 MHz crystal frequency, loaded with 75
Ω
(CVBS) and 1 k
Ω
(SSIF/audio). Values are meant for ‘easy programming’
settings (recommended) except internal mono audio and IF demodulation. The low IF spectrum is delivered by a professional
downconverter.
Symbol
V
DD(1V2)
V
DD(3V3)
I
DD(tot)(1V2)
I
DD(tot)(3V3)
P
tot
Parameter
supply voltage (1.2 V)
supply voltage (3.3 V)
total supply current (1.2 V)
total supply current (3.3 V)
total power dissipation
default settings; 75
Ω
drive;
f
s
= 54 MHz at ADC; including DAC
loads; R
RSET
= 1 kΩ
Power-save mode; f
s
= 54 MHz at
ADC; including DAC loads;
R
RSET
= 2 kΩ; see
Section 13.6
Standby mode
IF input
V
i(p-p)
V
i
f
i
peak-to-peak input voltage for full-scale ADC input (0 dBFS)
input voltage
input frequency
operational input related to ADC full
scale; all standards; sum of all signals
PC / SC1
M/N standard
B standard
G/H standard
I standard
DK and L standard
L-accent standard
FM radio
Carrier recovery FPLL
B
−3dB(cl)
∆f
pullin
m
over(PC)
closed-loop
−3
dB
bandwidth
pull-in frequency range
picture carrier
overmodulation index
stop-band suppression
group delay equalizer
ripple time
black for L/L-accent standard; flat field
white else
video low-pass filter (M/N, B/G/H, I,
D/K, L/L-accent standard)
peak value for B/G/H half, D/K half,
I flat, M (FCC) full, L/L-accent full
standard
wide
[3]
[1]
[1]
Conditions
digital and analog
digital and analog
Min
1.08
2.97
-
-
-
Typ
1.2
3.3
28
125
434
Max
1.32
3.63
33
136
490
Unit
V
V
mA
mA
mW
Power supply
[2]
-
324
369
mW
-
1.8
−3
7
2.0
−3
10
2.2
−3
mW
V
dBFS
-
-
-
-
-
-
-
60
±830
115
5.75 / 1.25 -
6.75 / 1.25 -
7.75 / 2.25 -
7.75 / 1.75 -
7.75 / 1.25 -
1.25 / 7.75 -
1.25
60
±830
117
-
60
±830
-
MHz
MHz
MHz
MHz
MHz
MHz
MHz
kHz
kHz
%
IF demodulation (video equalizer in Flat mode)
α
sup(stpb)
t
ripple(GDE)
-
-
−60
20
-
40
dB
ns
TDA8295_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 4 February 2008
3 of 77
NXP Semiconductors
TDA8295
Digital global standard low IF demodulator for analog TV and FM radio
Table 1.
Quick reference data
…continued
Power supplies 3.3 V, 1.2 V; T
amb
= 25
°
C; PC / SC1 for L and M = 10 dB, all others 13 dB; residual picture carrier for L = 3 %,
all others 10 %; FM/AM modulation = 54 %, 1 kHz modulation frequency; measured in application PCB (see
Figure 12)
with
16 MHz crystal frequency, loaded with 75
Ω
(CVBS) and 1 k
Ω
(SSIF/audio). Values are meant for ‘easy programming’
settings (recommended) except internal mono audio and IF demodulation. The low IF spectrum is delivered by a professional
downconverter.
Symbol
V
o(p-p)
Parameter
peak-to-peak output
voltage
Conditions
negative PC modulation (all standards
except L/L-accent); 75
Ω
DC load;
sync-white modulation
90 % (nominal)
positive PC modulation (L/L-accent
standard); 75
Ω
DC load; sync-white
modulation
97 % (nominal)
B
video(−3dB)
−3
dB video bandwidth
overall video response; CVBS
equalizer flat
all standards except M/N
M/N standard
α
resp(f)
G
dif
ϕ
dif
(S/N)
w
frequency response
differential gain
differential phase
weighted signal-to-noise
ratio
video equalizer; 8 equally spaced
settings; value at 3.9 MHz
4.8
3.9
−5
-
-
58
4.85
4.05
-
1.5
1.5
62
-
-
+4.5
3
3
-
MHz
MHz
dB
%
deg
dB
0.8
1.0
1.2
V
0.8
1.0
1.2
V
Min
Typ
Max
Unit
CVBS output
“ITU-T J.63 line 330”
“ITU-T J.63 line 330”
all standards; unified weighting filter
(“ITU-T
J.61”);
PC at
−6
dBFS
1 kΩ DC or AC load; no modulation;
PC / SC1 = 13 dB; scaled linearly for
all other ratios
all standards except B/G/H
B/G/H standard
FM radio (single carrier)
SSIF/mono sound output
V
o(SSIF)(RMS)
RMS SSIF output voltage
30
27
460
125
35
32
530
143
40
37
610
165
mV
mV
mV
mV
V
o(AF)(RMS)
RMS AF output voltage
1 kΩ DC or AC load
M standard; 54 % modulation
degree (±13.5 kHz FM deviation
before pre-emphasis)
B, G/H, I, D, K standard; 54 %
modulation degree (±27 kHz
FM deviation before pre-emphasis)
125
143
165
mV
α
hr(AF)
AF headroom
before clipping; 1 kΩ DC or AC load
M standard; related to
±25
kHz
peak deviation before pre-emphasis
B, G/H, I, D, K standard; related to
±50
kHz peak deviation before
pre-emphasis
7
7
7
7
7
7
dB
dB
THD
total harmonic distortion
FM; for 50 kHz deviation before
pre-emphasis (25 kHz for M standard)
AM; m = 80 %
-
-
0.1
0.6
0.2
1
%
%
TDA8295_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 4 February 2008
4 of 77
NXP Semiconductors
TDA8295
Digital global standard low IF demodulator for analog TV and FM radio
Table 1.
Quick reference data
…continued
Power supplies 3.3 V, 1.2 V; T
amb
= 25
°
C; PC / SC1 for L and M = 10 dB, all others 13 dB; residual picture carrier for L = 3 %,
all others 10 %; FM/AM modulation = 54 %, 1 kHz modulation frequency; measured in application PCB (see
Figure 12)
with
16 MHz crystal frequency, loaded with 75
Ω
(CVBS) and 1 k
Ω
(SSIF/audio). Values are meant for ‘easy programming’
settings (recommended) except internal mono audio and IF demodulation. The low IF spectrum is delivered by a professional
downconverter.
Symbol
B
AF(−3dB)
(S/N)
w(AF)
Parameter
−3
dB AF bandwidth
AF weighted
signal-to-noise ratio
Conditions
AM
FM
via internal mono sound demodulator;
“ITU-R BS.468-4”;
FM mode related to
27 kHz deviation before pre-emphasis;
10 % residual PC; SC1
color bar picture
via internal mono sound demodulator;
“ITU-R BS.468-4”;
AM; m = 54 %; 3 %
residual PC; SC1
color bar picture
[1]
[2]
[3]
50 % ADC current; 100 % video DAC current; 50 % sound DAC current.
50 % ADC current; 50 % video DAC current; 25 % sound DAC current.
The pull-in range can be doubled to
±1660
kHz by I
2
C-bus register like described in
Table 16.
Then the AFC read-out has 256 steps.
Min
20
40
Typ
27
50
Max
-
-
Unit
kHz
kHz
54
58
-
dB
43
46
-
dB
5. Ordering information
Table 2.
Ordering information
Package
Name
TDA8295HN
HVQFN40
Description
plastic thermal enhanced very thin quad flat package; no leads;
40 terminals; body 6
×
6
×
0.85 mm
Version
SOT618-1
Type number
TDA8295_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 4 February 2008
5 of 77
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