TDA8745 Datasheet, PDF (24/40 Pages) NXP Semiconductors – Satellite sound receiver with I2C-bus control

Philips Semiconductors
Satellite sound receiver with I²C-bus control
Preliminary specification
TDA8745
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
SVRR_P1-P2
supply voltage ripple rejection
V_RR = 100 mV; f_i = 70 Hz; −
25 −
dB
NR = on; DEEM = 75 µs
V_RR = 100 mV; f_i = 1 kHz; −
4
−
dB
NR = on; DEEM = 75 µs
Output select
V_{i 25,24}
R_{i 25,24,33,31}
V_{o 23,22}
R_{o 23,22,21}
THD
S/N(A)
input voltage (pins 25 and 24)
input resistance at
pins 25, 24, 33 and 31
output voltage at pins 23 and 22
output resistance at
pins 23, 22 and 21
total harmonic distortion
signal-to-noise ratio
α_{ct L/R}; α_{ct R/L}
I²C-bus
crosstalk between channels
−
−
8
dBV
100 150 200 kΩ
V_24,25 = −6 dBV;
OS = external
−6.5 −6 −5.5 dBV
100 125 150 Ω
V_24,25 = −6 dBV;
−
OS = external; f = 1 kHz
A-weighted;
80
V_24,25 = −6 dBV;
OS = external
f = 1 kHz
−
0.01 0.3 %
−
−
dB
80 −
dB
C_i
I_sink
V_IH
V_IL
I_IH
I_IL
Address D4H
Address D6H
f_SCL
input capacitance
SDA sink current
HIGH level input voltage
LOW level input voltage
HIGH level input current
LOW level input current
address D4H
address D6H
SCL frequency
ADD_sel = LOW
ADD_sel = HIGH
−
4
−
pF
3
−
−
mA
3
−
5
V
0
−
1.5 V
−
−
10 µA
−
−
10 µA
0
−
1
V
3
−
5
V
−
−
100 kHz
Notes
1. Maximum of 0.5% THD at LF outputs.
2. When the increase of the output signal (pin 5 at 10.7 MHz) lags 1 dB behind the increase of the input signal
(pin 3; 7.02 MHz carrier), the so called 1 dB compression point is reached. For complex signals (more than one
sound carrier), this point will shift to a higher value.
3. The mixer performs both a mixing and amplifying action (normal operation). The synthesizer is tuned to the 7.3 MHz
incoming carrier.
4. The buffer output is sensitive to capacitive loading, therefore (capacitive) loads other than those present in the block
diagram (see Fig.1) should be avoided.
5. As present at the mixer output (pin 5) in ‘BPFTILT’ test mode the actual VCO sensitivity is two times the given value
because of the divide-by-two circuit between VCO output and mixer.
6. The required 4 MHz crystal can be omitted if this frequency is already available in the application. This signal source
should be connected to pin 40, via a capacitor in series with a resistor R_ext. The minimum required AC current is
50 µA, determined by the resistors R_int and R_ext and the level of the 4 MHz AC voltage. The value of R_int is 700 Ω
and the signal shape of the signal is not important.
1996 Mar 11
24