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C/NFM FM carrier C/Nc ratio NFM bandwidth = 6 MHz; white - 77 -
dBFM
-------------
-
noise for S/N = 40 dB;
Hz
CCIR468-2 ; quasi peak
C/NN NICAM carrier C/Nc ratio Nc bandwidth = 6 MHz; - 66 -
dBN
----------
bit error rate = 10-3;
Hz
white noise
Demodulator performance
Vo(nom)(RMS) nominal level output voltage note 2 400 500 600 mV
(RMS value)
THD + N total harmonic distortion + noise from FM source to any output - 0.3 0.5 %
with low-pass 30 kHz/3 dB;
Vo = 1 V (RMS)
from NICAM source to any - 0.1 0.3 %
output with low-pass
30 kHz/3 dB; Vo = 1 V (RMS)
S/N signal-to-noise ratio SC1 from FM source to any 61 65 - dB
output; Vo = 1 V (RMS);
CCIR468-2 ; quasi peak;
TIMPOL bit HIGH
SC2 from FM source to any 57 60 - dB
output; Vo = 1 V (RMS);
CCIR468-2 ; quasi peak;
TIMPOL bit HIGH
NICAM source; NICAM in accordance with
Vo = 1 V (RMS); CCIR468-2 ; EBU specification ; note 1
quasi peak
1998 Apr 27 46
Philips Semiconductors Preliminary specification
Digital TV sound demodulator/decoder TDA9874H
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
B(-3dB) -3 dB bandwidth from FM source to any output 14.5 15 - kHz
from NICAM source to any 14.5 15 - kHz
output
fresp frequency response from FM/NICAM to any output; -2 - +1 dB
20 Hz to 14 kHz reference 1 kHz
±cd(dual) dual signal channel separation note 6 65 70 - dB
±cs(stereo) stereo channel separation note 7 40 45 - dB
±AM AM suppression for FM AM: 1 kHz, 30% modulation; 50 -- dB
reference: 1 kHz, 50 kHz
deviation
dmAM AM demodulation SIF level 100 mV (RMS); 54% - 36 - dB
AM; 1 kHz AF; CCIR468 ;
quasi peak
IDENTIFICATION FOR FM SYSTEMS
mpilot(ident) pilot modulation for identification 25 50 75 %
C/Npilot(ident) pilot sideband C/N for - 32 -
dB
-------
identification start
Hz
hys(tun) hysteresis - - 2 dB
fident identification window B/G stereo
slow mode 116.85 - 118.12 Hz
medium mode 116.11 - 118.89 Hz
fast mode 114.65 - 120.46 Hz
B/G dual
slow mode 273.44 - 274.81 Hz
medium mode 272.07 - 276.20 Hz
fast mode 270.73 - 277.60 Hz
ton(ident) total identification time on slow mode - - 2 s
medium mode - - 1 s
fast mode - - 0.5 s
toff(ident) total identification time off slow mode - - 2 s
medium mode - - 1 s
fast mode - - 0.5 s
Mono and external inputs
Vi(nom)(rms) nominal level input voltage note 2 - 500 - mV
(RMS value)
Vi(cl)(rms) clipping level input voltage THD
(RMS value)
Ri input resistance note 3 28 35 42 k&!
1998 Apr 27 47
Philips Semiconductors Preliminary specification
Digital TV sound demodulator/decoder TDA9874H
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
Analog audio outputs
Vo(clip)(rms) clipping level output voltage THD
(RMS value)
Ro output resistance 150 250 375 &!
RL(AC) AC load resistor 10 -- k&!
RL(DC) DC load resistor 10 -- k&!
Co(L) output load capacitor - 10 12 nF
Voffset(DC) static DC offset voltage - 30 70 mV
±mute mute suppression nominal input signal from any 80 -- dB
source; fi = 1 kHz; note 2
Bline bandwidth from external and mono 20 -- kHz
source; -3 dB bandwidth
Gro roll-off gain at 14.5 kHz from any source -3 -2 - dB
PSRR power supply ripple rejection fripple = 70 Hz; 40 45 - dB
Vripple = 100 mV (peak);
CVref =47µF; signal from I2S
Audio performance
THD + N total harmonic distortion + noise Vin/out = 1 V (RMS); fi = 1 kHz; - 0.1 0.3 %
bandwidth 20 Hz to 20 kHz;
from external/mono input to
output copy
S/N signal-to-noise ratio reference voltage 78 90 - dB
V0 = 1.4 V (RMS); fi = 1 kHz;
CCIR468 ; quasi peak; from
external/mono input to output
copy
±ct crosstalk attenuation between any analog input 70 -- dB
pairs; fi = 1 kHz
±cs channel separation between left and right of 65 -- dB
external input pair
between left and right of output 60 -- dB
pair
VCXO and clock generation
VCXO
Crystal input
Ci input capacitance - - 10 pF
Vbias(DC) DC bias voltage Ri = 100 k&! 3.5 3.63 3.7 V
Crystal output
Vosc(p-p) oscillation amplitude - 1.4 - V
(peak-to-peak value)
Vbias(DC) DC bias voltage 2.3 2.53 2.8 V
Gm mutual conductance at 16.6 17.6 18.8
mS
24.576 MHz
1998 Apr 27 48
Philips Semiconductors Preliminary specification
Digital TV sound demodulator/decoder TDA9874H
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
Co output capacitance - - 10 pF
CRYSTAL SPECIFICATION (FUNDAMENTAL MODE)
fxtal crystal frequency note 4 - 24.576 - MHz
CL load capacitance - 20 - pF
C1 series capacitance - 20 - fF
C0 parallel capacitance - - 7 pF
S pulling sensitivity CL changed from 18 to 16 pF - 25 - 6
10
-----------
pF
Rs(eq) equivalent series resistance at nominal frequency - - 30 &!
Rs(eq)(UM) equivalent series resistance of 2RR -- &!
unwanted mode
Tamb operating ambient temperature -20 +25 +70 °C
XJ adjustment tolerance - - ±30 10-6
XD drift across temperature range - - ±30 10-6
XA ageing - - ±5
6
10
-----------
year
Notes
1. Audio performance is limited by the dynamic range of the NICAM 728 system. Due to companding, the quantization
noise is never lower than -62 dB with respect to the input level.
2. Definition of levels and level setting (see Tables 75 and 76):
a) The full-scale level for analog audio signals is VFS = 1.4 V (RMS). The nominal level at the digital crossbar switch
is defined at -15 dB (FS).
b) Nominal audio input levels: extern, mono: 500 mV (RMS); -9 dB (FS).
3. If the supply voltage for the TDA9874H is switched off, because of the ESD protection circuitry all audio input pins
are short-circuited.
4. The Philips crystal (order number 9922 520 20106) is suited for this application.
5. The demodulation/decoding is still functional above and below the limits given.
6. FM source; in dual mode only A (respectively B) signal modulated; measured at B (respectively A) channel output;
Vo = 1 V (RMS) of modulated channel.
7. FM source; in stereo mode only L (respectively R) signal modulated; measured at R (respectively L) channel output;
Vo = 1 V (RMS) of modulated channel.
1998 Apr 27 49
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Table 75 Level setting FM, AM and NICAM
0 dB (FS) = 1.4 V (RMS), FS means full scale.
TRANSMITTER DAC
NOMINAL LEVEL AT LEVEL ADJUST NOMINAL LEVEL NOMINAL OUTPUT
SOURCE NOMINAL MODULATION GAIN
DEMODULATOR OUTPUT SETTING AT CROSSBAR VOLTAGE VO
DEPTH SETTING
FM 15 kHz deviation -24 dB (FS) +9 dB -15 dB (FS) +6 dB 500 mV (RMS)
M standard (spread of ±0.5 dB
due to different
FM 27 kHZ deviation -19 dB (FS) +4 dB
transmitter
B/G, D/K, I
references)
standard
AM 54% -19 dB (FS) +4 dB
L/L accent
standard
NICAM -11.2 dB (FS) -18 dB (FS) +3 dB
B/G, D/K,
L standard
NICAM -15.8 dB (FS) -23 dB (FS) +8 dB
I standard
Table 76 Level setting SAT FM
0 dB (FS) = 1.4 V (RMS), FS means full scale.
TRANSMITTER DAC MAXIMUM
NOMINAL LEVEL AT LEVEL ADJUST MAXIMUM LEVEL
SOURCE MAXIMUM MODULATION GAIN OUTPUT VOLTAGE
DEMODULATOR OUTPUT SETTING AT CROSSBAR
DEPTH SETTING VO
SAT FM 50 kHz deviation -13 dB (FS) +4 dB -9 dB (FS) +6 dB 1 V (RMS)
stereo
SAT FM 85 kHz deviation -9 dB (FS) 0 dB
mono
1998 Apr 27
Philips Semiconductors
Digital TV sound demodulator/decoder
50
Preliminary specification
TDA9874H
Philips Semiconductors Preliminary specification
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