tda8295 NXP Semiconductors, tda8295 Datasheet - Page 62

• Manufacturer Part Number: tda8295
• Description: Tda8295 Digital Global Standard Low If Demodulator For Analog Tv And Fm Radio
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 68.
Power supplies 3.3 V, 1.2 V; T
all others 10 %; FM/AM modulation = 54 %, 1 kHz modulation frequency; measured in application PCB (see
16 MHz crystal frequency, loaded with 75
settings (recommended) except internal mono audio and IF demodulation. The low IF spectrum is delivered by a professional
downconverter.
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10] SC2 is not listed, but supported for all world standards.
TDA8295_1
Product data sheet
Symbol
PSRR
sup(f)L(unw)
50 % ADC current; 100 % video DAC current; 50 % sound DAC current.
50 % ADC current; 50 % video DAC current; 25 % sound DAC current.
See
Standard dependent located at 7.25 MHz, 8.25 MHz, 9.25 MHz, 9.75 MHz and 10.25 MHz.
The pull-in range can be doubled to 1660 kHz by I
To counteract a fast IF level reduction, the digital IF AGC loop has a speed-up circuit for positive video modulation.
In the ordinary system application, this slow response is counteracted by the fast digital IF AGC loop. ADC clipping is practically avoided
by fast-attack AGC characteristic.
HAD: 250 ns for M standard, 200 ns for others.
The values given are measured with an IF AGC time constant of 5 Hz. For that, capacitor C7 in
instead of 2.2 nF. Doing so, the PSRR on 3.3 V together with the tuner can be improved.
Section 9.3.19
Characteristics
Parameter
power supply rejection ratio
unwanted leakage
frequency suppression
for PLL setting.
…continued
amb
= 25 C; PC / SC1 for L and M = 10 dB, all others 13 dB; residual picture carrier for L = 3 %,
Digital global standard low IF demodulator for analog TV and FM radio
(CVBS) and 1 k (SSIF/audio). Values are meant for ‘easy programming’
Conditions
f
video signal: gray; level: 50 %;
TDA8295 stand alone
f
video signal: gray; level: 50 %;
together with TDA8275A;
input level: 60 dB V (RMS)
PC
f
video signal: gray; level: 50 %;
together with TDA1827x; input
level: 60 dB V (RMS) PC
related to SSIF (SC1) in
10 MHz to 200 MHz band
ripple
ripple
ripple
FM sound; 1.2 V
FM sound; 3.3 V
AM sound; 1.2 V
AM sound; 3.3 V
FM sound; 1.2 V
FM sound; 3.3 V
AM sound; 1.2 V
AM sound; 3.3 V
FM sound; 1.2 V
FM sound; 3.3 V
AM sound; 1.2 V
AM sound; 3.3 V
Rev. 01 — 4 February 2008
2
C-bus register like described in
= 70 Hz; 100 mV (p-p);
= 70 Hz; 100 mV (p-p);
= 70 Hz; 100 mV (p-p);
Table
[9]
[9]
[9]
[9]
[9]
[9]
Min
-
-
-
-
-
-
-
-
-
-
-
-
-
16. Then the AFC read-out has 256 steps.
Figure 12
Typ
72
33
68
37
72
33
22
22
72
33
22
22
33
must be chosen 220 nF
TDA8295
© NXP B.V. 2008. All rights reserved.
Figure
Max Unit
-
-
-
-
-
-
-
-
-
-
-
-
-
12) with
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
62 of 77