TDA8425 NXP Semiconductors, TDA8425 Datasheet
TDA8425
Specifications of TDA8425
Available stocks
Related parts for TDA8425
TDA8425 Summary of contents
Page 1
... DATA SHEET TDA8425 Hi-fi stereo audio processor C-bus Product specification File under Integrated Circuits, IC02 INTEGRATED CIRCUITS October 1988 ...
Page 2
... Philips Semiconductors Hi-fi stereo audio processor; I GENERAL DESCRIPTION The TDA8425 is a monolithic bipolar integrated stereo sound circuit with a loudspeaker channel facility, digitally 2 controlled via the I C-bus for application in hi-fi audio and television sound. Feature: Source and mode selector for two stereo channels ...
Page 3
... Philips Semiconductors Hi-fi stereo audio processor; I October 1988 2 C-bus 3 Product specification TDA8425 ...
Page 4
... During forced mono mode the pseudo stereo mode cannot be used. October 1988 2 C-bus Fig.2 Pinning diagram. 80 dB. Both parts can be controlled independently (1) 4 Product specification TDA8425 ...
Page 5
... Treble control The treble control stage can be switched from + steps of 3 dB. Bias and power supply The TDA8425 includes a bias and power supply stage, which generates a voltage of 0.5 V impedance and injector currents for the logic part. Power-on reset The on-chip power-on reset circuit sets the mute bit to active, which mutes both parts of the treble amplifier. The muting can be switched by transmission of the mute bit ...
Page 6
... I C-bus controller (see Fig.5). Definition of 3rd byte A third byte is used to transmit data to the TDA8425. Table 2 defines the coding of the third byte after module address MAD and subaddress SAD. Table 2 Third byte after module address MAD and subaddress SAD function ...
Page 7
... POR not active Notes 1. Pseudo stereo function is not possible in this mode. 2. Where: POR = Power-ON Reset. Truth tables for the volume, bass and treble controls Table 6 Volume control 2 dB/step V 5 (dB October 1988 2 C-bus IS channel STL EFL Product specification TDA8425 ...
Page 8
... Philips Semiconductors Hi-fi stereo audio processor; I Table 7 Bass control 3 dB/step BA3 BA2 (dB Table 8 Treble control 3 dB/step TR3 TR2 (dB October 1988 2 C-bus BA2 BA0 TR2 TR0 Product specification TDA8425 ...
Page 9
... MAD and the correct subaddress SAD is required. Fig.5 Data transmission after a power-on reset with auto increment. October 1988 2 C-bus Fig.4 Data transmission after a power-on reset. Fig.6 Data transmission except after power-on reset. 9 Product specification TDA8425 ...
Page 10
... October 1988 2 C-bus 70 C (1) and V 500 V. SYMBOL V 10 5.4 ref 3 cap.n V cap.2 10 SYMBOL MIN cap SDA, SCL I 450 tot amb T 25 +150 stg MIN. TYP. 12.0 13 0 REF V REF V 0.3 1.5 + REF V 0.3 CC Product specification TDA8425 MAX. UNIT MAX. UNIT ...
Page 11
... October 1988 2 C-bus SYMBOL f SCL t HIGH t LOW SU; STA t HD; STA t SU; STO t BUF t SU; DAT V i(rms o(rms 600 mV (S+N)/N (S+N)/N (S+N)/ Product specification TDA8425 1000 pF MIN. TYP. MAX. 0 100 4 4.7 1 0.3 4.7 4 4.7 4.7 250 000 0.6 10 100 100 UNIT kHz ...
Page 12
... Resolution October 1988 2 C-bus SYMBOL MIN. THD THD THD cs RR 100 max G 63 min G 80 mute G G 1.5 step G 1.0 step 2.5 step 12 Product specification TDA8425 TYP. MAX. UNIT 0.05 % 0.07 0 100 2.0 2.5 dB/step 2.0 3.0 dB/step 3.0 3 ...
Page 13
... SU; STA t = start code hold time. HD; STA t = stop code set-up time. SU; STO October 1988 2 C-bus SYMBOL step 2 Fig.7 Timing requirements for I 13 Product specification TDA8425 MIN. TYP. MAX 2.5 3.0 3 bus free time. BUF t = data set-up time. SU; DAT t = data hold time ...
Page 14
... Hi-fi stereo audio processor; I Fig.8 Pseudo (phase in degrees function of frequency (left output). Fig.9 Input signal handling capability; gain = October 1988 2 C-bus pin 17 curve 5.6 3 5 600 ; R = 10k ; bass/treble = 0 dB Product specification TDA8425 pin 19 effect (nF) (nF) 15 normal 47 intensified 68 more intensifi ...
Page 15
... Philips Semiconductors Hi-fi stereo audio processor; I Fig.10 Input signal handling capability plotted against gain setting; THD = 60 dB kHz bass/treble = 0 dB Fig.11 Output signal handling capability; gain = 6 dB; R October 1988 2 C-bus = 600 ; bass/treble = 0 dB Product specification TDA8425 = 600 ; ...
Page 16
... Philips Semiconductors Hi-fi stereo audio processor; I Fig.12 Source selector separation (channel 2 and channel 1); gain = 0 dB bass/treble = 0 dB (1) gain = (2) gain = Fig.13 Stereo channel separation as a function of frequency October 1988 2 C-bus = Product specification TDA8425 = bass/treble = 0 dB; L ...
Page 17
... Philips Semiconductors Hi-fi stereo audio processor; I Fig.14 Mute signal rejection as a function of frequency; gain = 0 dB; V bass/treble = 0 dB; V Fig.15 Ripple rejection as a function of frequency; voltage ripple = 0.3 V (rms); R bass/treble = 0 dB; V October 1988 2 C-bus = Product specification TDA8425 = 1 ...
Page 18
... Hi-fi stereo audio processor; I Fig.16 Noise output voltage as a function of gain; weighted CCIR468 quasi peak gain dB Fig.17 Frequency response of bass and treble control; bass and treble gain settings = 12 to +15 dB; gain October 1988 2 C-bus = bass/treble = 0 dB 600 ; Product specification TDA8425 = ...
Page 19
... Philips Semiconductors Hi-fi stereo audio processor; I October 1988 2 C-bus Fig.18 Tone control with T-filter. Fig.19 Tone control. 19 Product specification TDA8425 ...
Page 20
... Philips Semiconductors Hi-fi stereo audio processor; I Fig.20 Turn-on behaviour 2 October 1988 2 C-bus = Fig.21 Turn-off behaviour; without modulation. L Fig.22 Turn-off behaviour; with modulation (shaded area). 20 Product specification TDA8425 ...
Page 21
... Philips Semiconductors Hi-fi stereo audio processor 239 mA load 110 ms off October 1988 2 C-bus Fig.23 Turn-on/off power supply circuit diagram. Fig.24 Level diagram. 21 Product specification TDA8425 ...
Page 22
... Philips Semiconductors Hi-fi stereo audio processor; I October 1988 2 C-bus Fig.25 Test and application circuit diagram. 22 Product specification TDA8425 ...
Page 23
... REFERENCES JEDEC EIAJ SC603 23 Product specification 3.60 8.25 10.0 2.54 7.62 3.05 7.80 8.3 0.14 0.32 0.39 0.10 0.30 0.12 0.31 0.33 EUROPEAN PROJECTION TDA8425 SOT146 ( max. 0.254 2.0 0.01 0.078 ISSUE DATE 92-11-17 95-05-24 ...
Page 24
... If the bit temperature is between 300 and 400 C, contact may seconds components conveys a license under the Philips’ system provided the system conforms to the I 24 Product specification TDA8425 ). If the stg max 2 C patent to use the 2 C specification defined by ...