TDA7498 STMicroelectronics, TDA7498 Datasheet
TDA7498
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TDA7498 Summary of contents
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... TDA7498TR - °C June 2010 = Description The TDA7498 is a dual BTL class-D audio amplifier with single power supply designed for home systems and active speaker applications. It comes in a 36-pin PowerSSO package with exposed pad up (EPU) to facilitate mounting a separate heatsink. Package PowerSSO36 (EPU) ...
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... Internal and external clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5.5.1 5.5.2 5.6 Output low-pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.7 Protection function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.8 Diagnostic output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 2/ Ω .13 For Ω .16 For R L Master mode (internal clock Slave mode (external clock Doc ID 16107 Rev 4 TDA7498 ...
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... TDA7498 List of Figures Figure 1. Internal block diagram (showing one channel only Figure 2. Pin connection (top view, PCB view Figure 3. Test circuit for characterizations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 4. Test board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 5. Output power (THD = 10%) vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 6. THD vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 7. THD vs. frequency ( Figure 8. ...
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... Table 2. Pin description list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 4. Thermal data Table 5. Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 6. Electrical specifications Table 7. Mode settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 8. Gain settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 9. How to set up SYNCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Table 10. PowerSSO36 EPU dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Table 11. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4/29 Doc ID 16107 Rev 4 TDA7498 ...
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... TDA7498 1 Device block diagram Figure 1 shows the block diagram of one of the two identical channels of the TDA7498. Figure 1. Internal block diagram (showing one channel only) Doc ID 16107 Rev 4 Device block diagram 5/29 ...
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... INNB 32 INPB 31 GAIN1 30 GAIN0 29 SVR 28 DIAG 27 SGND 26 VDDS 25 SYNCLK 24 ROSC 23 INNA 22 INPA EP, exposed pad Connect to ground 21 MUTE 20 STBY 19 VDDPW Doc ID 16107 Rev 4 TDA7498 SUB_GND 1 2 OUTPB 3 OUTPB 4 PGNDB 5 PGNDB 6 PVCCB 7 PVCCB 8 OUTNB 9 OUTNB 10 OUTNA OUTNA 11 12 PVCCA 13 PVCCA 14 PGNDA 15 PGNDA 16 OUTPA ...
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... TDA7498 2.2 Pin list Table 2. Pin description list Number Name 1 SUB_GND 2,3 OUTPB 4,5 PGNDB 6,7 PVCCB 8,9 OUTNB 10,11 OUTNA 12,13 PVCCA 14,15 PGNDA 16,17 OUTPA 18 PGND 19 VDDPW 20 STBY 21 MUTE 22 INPA 23 INNA 24 ROSC 25 SYNCLK 26 VDDS 27 SGND 28 DIAG 29 SVR 30 GAIN0 31 GAIN1 ...
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... Overcurrent protection threshold R OCP 8/29 Parameter Parameter Parameter = kΩ 100 nF kHz, G OSC Parameter Condition No LC filter, no load - Play mode Mute mode = 0 Ω L Doc ID 16107 Rev 4 TDA7498 Value Unit 44 V -0.3 to 3.6 V -40 to 150 °C -40 to 150 °C Min Typ Max Unit - 2 3 ° ...
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... TDA7498 Table 6. Electrical specifications (continued) Symbol Junction temperature at thermal T j shutdown R Input resistance i V Overvoltage protection threshold - OVP Undervoltage protection V UVP threshold R Power transistor on resistance dsON P Output power o P Output power o P Dissipated power D η Efficiency THD Total harmonic distortion G Closed-loop gain V ∆ ...
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... Pin MUTE voltage high (H) V MUTE Pin MUTE voltage low (L) A Mute attenuation MUTE (( with the external oscillator. SW SYNCLK 10/29 Parameter Condition - - MUTE + 182 kHz OSC SYNCLK SW Doc ID 16107 Rev 4 Min Typ 2 0 STBY with kΩ (see Figure 19.). TDA7498 Max Unit ...
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... TDA7498 4 Characterization 4.1 Test circuit Figure 3 shows the test circuit with which the characterization curves, shown in the next sections, were measured. Figure 3. Test circuit for characterizations Figure 4 shows the PCB layout. Doc ID 16107 Rev 4 Characterization 11/29 ...
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... Characterization Figure 4. Test board 12/29 Doc ID 16107 Rev 4 TDA7498 ...
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... TDA7498 4.2 Characterization curves Unless otherwise stated the measurements were made under the following conditions kHz Ω 4.2.1 For R L Figure 5. Output power (THD = 10%) vs. supply voltage Output power (W) Figure 6. THD vs. output power = 25.6 dB kΩ OSC 120 110 100 90 80 ...
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... Frequency (Hz 0.5 0.2 0.1 0.05 0.02 0. 100 200 500 Frequency (Hz) +3 +2.5 Ampl (dB) +2 +1.5 +1 +0.5 +0 -0.5 -1 -1 100 200 Frequency (Hz) Doc ID 16107 Rev 10k 20k 10k 20k 500 10k 20k TDA7498 ...
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... TDA7498 Figure 10. FFT performance (0 dBFS) FFT (dB) Figure 11. FFT performance (-60 dBFS) FFT (dB) +0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 20 50 100 200 500 Frequency (Hz) +0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 ...
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... Output power (W) Figure 13. THD vs. output power 16/29 120 110 100 +10 +12 +14 +16 +18 +20 +22 Supply voltage ( THD+N (%) 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 100m 200m 500m 1 2 Output power (W) Doc ID 16107 Rev 4 +24 +26 +28 +30 +32 +34 + kHz f = 100 100 200 TDA7498 ...
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... TDA7498 Figure 14. THD vs. frequency (1 W) THD+N (%) Figure 15. THD vs. frequency (100 mW) THD+N (%) Figure 16. Frequency response Ampl (dB 0.5 0.2 0.1 0.05 0.02 0. 100 200 500 Frequency (Hz 0.5 0.2 0.1 0.05 0.02 0. 100 200 500 Frequency (Hz) +3 +2.5 +2 +1.5 +1 +0.5 +0 -0.5 -1 -1 100 ...
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... Characterization Figure 17. FFT performance (0 dB) Figure 18. FFT performance (-60 dB) FFT (dB) 18/29 +0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 20 50 100 200 500 1k Frequency (Hz) Doc ID 16107 Rev 4 TDA7498 2k 5k 10k 20k ...
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... TDA7498 5 Applications information 5.1 Applications circuit Figure 19. Applications circuit for 6-Ω speakers Doc ID 16107 Rev 4 Applications information 19/29 ...
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... Figure 20. Applications circuit for 8-Ω speakers 5.2 Mode selection The three operating modes of the TDA7498 are set by the two inputs, STBY (pin 20) and MUTE (pin 21). Standby mode: all circuits are turned off, very low current consumption. Mute mode: inputs are connected to ground and the positive and negative PWM outputs are at 50% duty cycle ...
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... Figure 21. Standby and mute circuits Figure 22. Turn on/off sequence for minimizing speaker “pop” 5.3 Gain setting The gain of the TDA7498 is set by the two inputs, GAIN0 (pin 30) and GAIN1 (pin31). Internally, the gain is set by changing the feedback resistors of the amplifier. Table 8. Gain settings GAIN0 L ...
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... AC input signal. The equivalent circuit and frequency response of the input components are shown in Figure 23. For Ci = 470 nF the high-pass filter cut-off frequency is below 20 Hz π Ci Figure 23. Input circuit and frequency response 22/29 Input signal Input Ri Ci pin Doc ID 16107 Rev 4 TDA7498 Rf ...
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... If two or more class-D amplifiers are used in the same system recommended that all devices operate at the same clock frequency. This can be implemented by using one TDA7498 as master clock, while the other devices are in slave mode, that is, externally clocked. The clock interconnect is via pin SYNCLK of each device. As explained below, SYNCLK is an output in master mode and an input in slave mode ...
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... It is necessary to choose the L and C component values depending on the loud-speaker impedance. Some typical values, which give a cut-off frequency of 27 kHz, are shown in Figure 25 Figure 25. Typical LC filter for a 8-Ω speaker Figure 26. Typical LC filter for a 6-Ω speaker 24/29 and Figure 26 below. Doc ID 16107 Rev 4 TDA7498 ...
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... TDA7498 5.7 Protection function The TDA7498 is fully protected against overvoltages, undervoltages, overcurrents and thermal overloads as explained here. Overvoltage protection (OVP) If the supply voltage exceeds the value for V page 8 the overvoltage protection is activated which forces the outputs to the high-impedance state. When the supply voltage falls back to within the operating range the device restarts ...
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... Package mechanical data 6 Package mechanical data The TDA7498 comes in a 36-pin PowerSSO package with exposed pad up. Figure 28 shows the package outline and Table 10. PowerSSO36 EPU dimensions Symbol Min A 2. 0.18 c 0.23 D 10. 10. 0. 4.10 Y 4.90 In order to meet environmental requirements, ST offers these devices in different grades of ® ...
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Figure 28. PowerSSO36 EPU outline drawing h x 45° ...
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... Removed tables for standby, mute and gain after page 19. Removed datasheet preliminary status, updated features list and updated Device summary table 4 Added Table 5: Recommended operating conditions on page 8 updated minimum supply voltage Doc ID 16107 Rev 4 Changes on page 1 Table page 1 Table 1 on page 1 Figure page 1 TDA7498 with ...
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... TDA7498 Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...