TDA8742 Datasheet, PDF (12/21 Pages) NXP Semiconductors – Satellite sound circuit with noise reduction

Philips Semiconductors
Satellite sound circuit with noise reduction
Product specification
TDA8742; TDA8742H
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
Secondary channels - low-pass filter pins 38 and 30 (34 and 26)
V--V---_{R-R--E-E---C-C--T-T--L-L--,-,-R-R--E--E--C-C--T--T-R--R---(-(-5-1-0---k-k-H-H--z--z-)-)-}
50 kHz frequency response
with respect to 1 kHz
note 7
−25 −16 −9 dB
Secondary channels - noise reduction pins 25 and 24 (21 and 20); note 4
V_{OL, OR}
output voltage at 0 dB noise
reduction input level
∆f_S1 = ∆f_S2 = 50 kHz;
no fixed de-emphasis
connected
V--V---_{O-O---L-L-,-,-O-O---R-R---(--(1--1-5---k-k-H-H--z-z-)--)-}
15 kHz frequency response
with respect to 1 kHz at 0 dB
noise reduction input level
∆f_S1 = ∆f_S2 = 50 kHz;
no fixed de-emphasis
connected
V_OL,OR
output voltage at −20 dB noise ∆f_S1 = ∆f_S2 = 5 kHz;
reduction input level
no fixed de-emphasis
connected
V--V---_{O-O---L-L-,-,-O-O---R-R---(--(1--1-5---k-k-H-H--z-z-)--)-}
15 kHz frequency response ∆f_S1 = ∆f_S2 = 5 kHz;
with respect to 1 kHz at −20 dB no fixed de-emphasis
noise reduction input level
connected
−1 +1 +3 dBV
−2 0
+2 dB
−29 −26 −23 dBV
−13 −11.5 −10 dB
External inputs - pin 28 (24) (left) and pin 27 (23) (right) - overall performance (output selector in position 5)
V_EXTR,EXTL
R_i
V_OL,OR
THD
S/N(A)
α_L/R,α_R/L
input signal level
input resistance
output level
total harmonic distortion
signal-to-noise ratio
crosstalk
V_{EXTR, EXTL} = −6 dBV
V_{EXTR, EXTL} = −6 dBV;
f_i = 1 kHz
A-weighted;
V_{EXTR, EXTL} = −6 dBV
f_i = 1 kHz
−
−
6
dBV
95 150 200 kΩ
−6.5 −6.0 −5.5 dBV
−
−
0.1 %
80 −
−
dB
−
80 −
dB
Input selector control circuit pins 3 and 5 (41 and 43) (see also Table 1) and secondary channels PLLs disable
[SCD pin 11 (6)]; pin 11 (6); pins left open-circuit = logic HIGH
V_IL
LOW level input voltage
0
−
1.2 V
V_IH
HIGH level input voltage
3.5 −
9
V
R_i
input resistance
connected to V_P
65 100 130 kΩ
October 1994
12