SAA7282 Datasheet, PDF (17/25 Pages) NXP Semiconductors – Terrestrial Digital Sound Decoder TDSD2

Philips Semiconductors
Terrestrial Digital Sound Decoder (TDSD2)
Product specification
SAA7282
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX. UNIT
SDA with respect to SCL (see Fig.8)
f_SCL
t_BUF
t_HD;STA
t_LOW
t_HIGH
t_SU;STA
t_HD;DAT
t_SU;DAT
t_r
t_f
t_SU;STO
t_of
SCL clock frequency
bus free time
start code hold time
SCL clock LOW time
SCL clock HIGH time
start code set-up time
data hold time
data set-up time
SDA and SCL rise time
SDA and SCL fall time
stop code set-up time
output fall time
note 4
note 5
note 6
0
−
1300
−
600
−
1300
−
600
−
600
−
0
−
100
−
50
−
50
−
600
−
50
−
400
kHz
−
ns
−
ns
−
ns
−
ns
−
ns
−
ns
−
ns
300
ns
300
ns
−
ns
200
ns
Notes
1. Outputs OPL and OPR are measured with external components as recommended in Fig.11.
2. Total analog performance is limited by dynamic range of the NICAM 728 system. Due to compansion the quantization
noise is never lower than approximately -62 dB with respect to the input level.
3. Measured with a -30 dB, 1 kHz NICAM 728 input signal.
4. Note that a transmitter must internally provide at least a hold time to bridge the undefined region (max. 300 ns) of the
falling edge of SCL.
5. If a fast I²C-bus device is used in an up to 100 kbit/s I²C-bus system, then the requirement t_SU;DAT ≥250 ns is always
fulfilled if this device cannot stretch the LOW level of the SCL signal. If a device stretches the LOW level of the SCL
signal, then data to SD9A must be asserted (t_RD(max) + t_SU;DAT) = 1000 + 250 = 1250 ns before the SCL signal is
released to be compatible with the up to 100 kbit/s I²C-bus specification.
6. The output fall time is measured between 3.0 V and 1.5 V for a bus capacitance of 400 pF and an active pull-up.
July 1993
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