TS4962MEIJT

TS4962M 3W filter-free class D audio power amplifier Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Operating from VCC = 2.4V to 5.5V Standby mode active low Output power: 3W into 4Ω and 1.75W into 8Ω with 10% THD+N max and 5V power supply. Output power: 2.3W @5V or 0.75W @ 3.0V into 4Ω with 1% THD+N max. Output power: 1.4W @5V or 0.45W @ 3.0V into 8Ω with 1% THD+N max. Adjustable gain via external resistors Low current consumption 2mA @ 3V Efficiency: 88% typ. Signal to noise ratio: 85dB typ. PSRR: 63dB typ. @217Hz with 6dB gain PWM base frequency: 250kHz Pin connections IN+ 1/A1 VDD 4/B1 IN7/C1 GND 2/A2 VDD 5/B2 STBY 8/C2 OUT3/A3 GND 6/B3 OUT+ 9/C3 IN+: positive differential input IN-: negative differential input VDD: analog power supply GND: power supply ground STBY: standby pin (active low) OUT+: positive differential output OUT-: negative differential output Block diagram B1 Vcc C2 Stdby 300k Internal Bias 150k Out+ C3 Output PWM H Bridge 150k Oscillator A3 OutB2 Low pop & click noise Thermal shutdown protection Available in flip-chip 9 x 300μm (Pb-free) C1 InIn+ A1 + Description The TS4962M is a differential Class-D BTL power amplifier. It is able to drive up to 2.3W into a 4Ω load and 1.4W into a 8Ω load at 5V. It achieves outstanding efficiency (88%typ.) compared to classical Class-AB audio amps. The gain of the device can be controlled via two external gain-setting resistors. Pop & click reduction circuitry provides low on/off switch noise while allowing the device to start within 5ms. A standby function (active low) allows the reduction of current consumption to 10nA typ. GND A2 B3 Applications ■ ■ ■ Cellular phone PDA Notebook PC January 2007 Rev 4 1/41 www.st.com 41 Contents TS4962M Contents 1 2 3 4 5 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Application component information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.11 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Gain in typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 29 For example: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Wake-up time: (tWU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Shutdown time (tSTBY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Consumption in shutdown mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Different examples with summed inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Example 1: Dual differential inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Example 2: One differential input plus one single-ended input . . . . . . . . . . . . . . . 34 6 7 8 9 10 Demoboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Footprint recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 2/41 TS4962M Absolute maximum ratings 1 Absolute maximum ratings Table 1. Symbol VCC Vin Toper Tstg Tj Rthja Pdiss ESD ESD Latch-up VSTBY Absolute maximum ratings Parameter Supply voltage(1), (2) Input voltage (3) Operating free-air temperature range Storage temperature Maximum junction temperature Thermal resistance junction to ambient Power dissipation Human body model Machine model Latch-up immunity Standby pin voltage maximum voltage (6) Lead temperature (soldering, 10sec) (4) Value 6 GND to VCC -40 to + 85 -65 to +150 150 200 Internally Limited(5) 2 200 200 GND to VCC 260 Unit V V °C °C °C °C/W kV V mA V °C 1. Caution: This device is not protected in the event of abnormal operating conditions, such as for example, short-circuiting between any one output pin and ground, between any one output pin and VCC, and between individual output pins. 2. All voltage values are measured with respect to the ground pin. 3. The magnitude of the input signal must never exceed VCC + 0.3V / GND - 0.3V. 4. The device is protected in case of over temperature by a thermal shutdown active @ 150°C. 5. Exceeding the power derating curves during a long period causes abnormal operation. 6. The magnitude of the standby signal must never exceed VCC + 0.3V / GND - 0.3V. Table 2. Symbol VCC VIC VSTBY RL Rthja Operating conditions Parameter Supply voltage(1) Common mode input voltage Standby voltage input: (3) Device ON Device OFF Load resistor Thermal resistance junction to ambient (5) 1.4 ≤ VSTBY ≤ VCC GND ≤VSTBY ≤0.4 (4) ≥4 90 V Ω °C/W range(2) Value 2.4 to 5.5 0.5 to VCC - 0.8 Unit V V 1. For VCC from 2.4V to 2.5V, the operating temperature range is reduced to 0°C ≤Tamb ≤70°C. 2. For VCC from 2.4V to 2.5V, the common mode input range must be set at VCC/2. 3. Without any signal on VSTBY, the device will be in standby. 4. Minimum current consumption is obtained when VSTBY = GND. 5. With heat sink surface = 125mm2. 3/41 Application component information TS4962M 2 Application component information Table 3. Component information Functional description Bypass supply capacitor. Install as close as possible to the TS4962M to minimize high-frequency ripple. A 100nF ceramic capacitor should be added to enhance the power supply filtering at high frequency. Input resistor to program the TS4962M differential gain (gain = 300kΩ/Rin with Rin in kΩ). Due to common mode feedback, these input capacitors are optional. However, they can be added to form with Rin a 1st order high pass filter with -3dB cut-off frequency = 1/(2*π*Rin*Cin). Component Cs Rin Input capacitor Figure 1. Typical application schematics Vcc Vcc B1 Vcc C2 Stdby 300k Internal Bias 150k B2 In+ Cs 1u Out+ C3 Output PWM H Bridge GND GND GND + Rin C1 InIn+ Differential Input InA1 Rin Input capacitors are optional + 150k Oscillator SPEAKER A3 Out- GND GND TS4962 A2 B3 GND Vcc Vcc B1 Vcc C2 Stdby 300k Internal Bias 150k B2 In+ Cs 1u 4 Ohms LC Output Filter Out+ C3 Output PWM H Bridge GND GND GND 15µH + Rin C1 InIn+ Differential Input InA1 Rin + 150k Oscillator 2µF GND Load Input capacitors are optional GND A3 Out- 2µF 15µH TS4962 GND A2 B3 GND 30µH 1µF GND 1µF 30µH 8 Ohms LC Output Filter 4/41 TS4962M Electrical characteristics 3 Table 4. Symbol ICC ISTBY VOO Electrical characteristics VCC = +5V, GND = 0V, VIC = 2.5V, tamb = 25°C (unless otherwise specified) Parameter Supply current Standby current (1) Conditions No input signal, no load No input signal, VSTBY = GND No input signal, RL = 8Ω G=6dB THD = 1% max, F = 1kHz, RL = 4Ω THD = 10% max, F = 1kHz, RL = 4Ω THD = 1% max, F = 1kHz, RL = 8Ω THD = 10% max, F = 1kHz, RL = 8Ω Pout = 900mWRMS, G = 6dB, 20Hz < F < 20kHz RL = 8Ω + 15µH, BW < 30kHz Pout = 1WRMS, G = 6dB, F = 1kHz, RL = 8Ω + 15µH, BW < 30kHz Pout = 2WRMS, RL = 4Ω + ≥ 15µH Pout =1.2WRMS, RL = 8Ω+ ≥ 15µH F = 217Hz, RL = 8Ω G=6dB, , Vripple = 200mVpp F = 217Hz, RL = 8Ω, G = 6dB, ΔVicm = 200mVpp Rin in kΩ Min. Typ. 2.3 10 3 2.3 3 1.4 1.75 1 0.4 78 88 63 Max. 3.3 1000 25 Unit mA nA mV Output offset voltage Pout Output power W Total harmonic THD + N distortion + noise % Efficiency Efficiency Power supply rejection ratio with inputs grounded (2) Common mode rejection ratio Gain value Internal resistance from Standby to GND Pulse width modulator base frequency Signal to noise ratio Wake-up time Standby time % PSRR dB CMRR Gain RSTBY FPWM SNR tWU tSTBY 57 273k Ω ----------------R in 300k Ω ----------------R in 327k Ω ----------------R in dB V/V kΩ kHz dB 10 10 ms ms 273 180 A-weighting, Pout = 1.2W, RL = 8Ω 300 250 85 5 5 327 320 5/41 Electrical characteristics Table 4. Symbol TS4962M VCC = +5V, GND = 0V, VIC = 2.5V, tamb = 25°C (unless otherwise specified) (continued) Parameter Conditions F = 20Hz to 20kHz, G = 6dB Unweighted RL = 4Ω A-weighted RL = 4Ω Unweighted RL = 8Ω A-weighted RL = 8Ω Unweighted RL = 4Ω + 15µH A-weighted RL = 4Ω + 15µH Min. Typ. Max. Unit 85 60 86 62 83 60 88 64 78 57 87 65 82 59 μVRMS VN Output voltage noise Unweighted RL = 4Ω + 30µH A-weighted RL = 4Ω + 30µH Unweighted RL = 8Ω + 30µH A-weighted RL = 8Ω + 30µH Unweighted RL = 4Ω + Filter A-weighted RL = 4Ω + Filter Unweighted RL = 4Ω + Filter A-weighted RL = 4Ω + Filter 1. Standby mode is active when VSTBY is tied to GND. 2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz. 6/41 TS4962M Table 5. Symbol ICC ISTBY VOO Electrical characteristics VCC = +4.2V, GND = 0V, VIC = 2.5V, Tamb = 25°C (unless otherwise specified)(1) Parameter Supply current Standby current (2) Conditions No input signal, no load No input signal, VSTBY = GND No input signal, RL = 8Ω G=6dB THD = 1% max, F = 1kHz, RL = 4Ω THD = 10% max, F = 1kHz, RL = 4Ω THD = 1% max, F = 1kHz, RL = 8Ω THD = 10% max, F = 1kHz, RL = 8Ω Pout = 600mWRMS, G = 6dB, 20Hz < F < 20kHz RL = 8Ω + 15µH, BW < 30kHz Pout = 700mWRMS, G = 6dB, F = 1kHz, RL = 8Ω + 15µH, BW < 30kHz Pout = 1.45WRMS, RL = 4Ω + ≥ 15µH Pout =0.9WRMS, RL = 8Ω+ ≥ 15µH F = 217Hz, RL = 8Ω G=6dB, , Vripple = 200mVpp F = 217Hz, RL = 8Ω, G = 6dB, ΔVicm = 200mVpp Rin in kΩ Min. Typ. 2.1 10 3 1.6 2 0.95 1.2 1 0.35 78 88 63 Max. 3 1000 25 Unit mA nA mV Output offset voltage Pout Output power W Total harmonic THD + N distortion + noise % Efficiency Efficiency Power supply rejection ratio with inputs grounded (3) Common mode rejection ratio Gain value Internal resistance from Standby to GND Pulse width modulator base frequency Signal to noise ratio Wake-uptime Standby time % PSRR dB CMRR Gain RSTBY FPWM SNR tWU tSTBY 57 273k Ω ----------------R in 300k Ω ----------------R in 327k Ω ----------------R in dB V/V kΩ kHz dB 10 10 ms ms 273 180 A-weighting, Pout = 0.9W, RL = 8Ω 300 250 85 5 5 327 320 7/41 Electrical characteristics Table 5. Symbol TS4962M VCC = +4.2V, GND = 0V, VIC = 2.5V, Tamb = 25°C (unless otherwise specified)(1) Parameter Conditions F = 20Hz to 20kHz, G = 6dB Unweighted RL = 4Ω A-weighted RL = 4Ω Unweighted RL = 8Ω A-weighted RL = 8Ω Unweighted RL = 4Ω + 15µH A-weighted RL = 4Ω + 15µH Min. Typ. Max. Unit 85 60 86 62 83 60 88 64 78 57 87 65 82 59 μVRMS VN Output voltage noise Unweighted RL = 4Ω + 30µH A-weighted RL = 4Ω + 30µH Unweighted RL = 8Ω + 30µH A-weighted RL = 8Ω + 30µH Unweighted RL = 4Ω + Filter A-weighted RL = 4Ω + Filter Unweighted RL = 4Ω + Filter A-weighted RL = 4Ω + Filter 1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V. 2. Standby mode is active when VSTBY is tied to GND. 3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz. 8/41 TS4962M Table 6. Symbol ICC ISTBY VOO Electrical characteristics VCC = +3.6V, GND = 0V, VIC = 2.5V, Tamb = 25°C (unless otherwise specified)(1) Parameter Supply current Standby current (2) Conditions No input signal, no load No input signal, VSTBY = GND No input signal, RL = 8Ω G=6dB THD = 1% max, F = 1kHz, RL = 4Ω THD = 10% max, F = 1kHz, RL = 4Ω THD = 1% max, F = 1kHz, RL = 8Ω THD = 10% max, F = 1kHz, RL = 8Ω Pout = 500mWRMS, G = 6dB, 20Hz < F< 20kHz RL = 8Ω + 15µH, BW < 30kHz Pout = 500mWRMS, G = 6dB, F = 1kHz, RL = 8Ω + 15µH, BW < 30kHz Pout = 1WRMS, RL = 4Ω + ≥ 15µH Pout =0.65WRMS, RL = 8Ω+ ≥ 15µH F = 217Hz, RL = 8Ω G=6dB, , Vripple = 200mVpp F = 217Hz, RL = 8Ω, G = 6dB, ΔVicm = 200mVpp Rin in kΩ Min. Typ. 2 10 3 1.15 1.51 0.7 0.9 1 0.27 78 88 62 Max. 2.8 1000 25 Unit mA nA mV Output offset voltage Pout Output power W Total harmonic THD + N distortion + noise % Efficiency Efficiency Power supply rejection ratio with inputs grounded (3) Common mode rejection ratio Gain value Internal resistance from Standby to GND Pulse width modulator base frequency Signal to noise ratio Wake-uptime Standby time % PSRR dB CMRR Gain RSTBY FPWM SNR tWU tSTBY 56 273k Ω ----------------R in 300k Ω ----------------R in 327k Ω ----------------R in dB V/V kΩ kHz dB 10 10 ms ms 273 180 A-weighting, Pout = 0.6W, RL = 8Ω 300 250 83 5 5 327 320 9/41 Electrical characteristics Table 6. Symbol TS4962M VCC = +3.6V, GND = 0V, VIC = 2.5V, Tamb = 25°C (unless otherwise specified)(1) Parameter Conditions F = 20Hz to 20kHz, G = 6dB Unweighted RL = 4Ω A-weighted RL = 4Ω Unweighted RL = 8Ω A-weighted RL = 8Ω Unweighted RL = 4Ω + 15µH A-weighted RL = 4Ω + 15µH Min. Typ. Max. Unit 83 57 83 61 81 58 87 62 77 56 85 63 80 57 μVRMS VN Output voltage noise Unweighted RL = 4Ω + 30µH A-weighted RL = 4Ω + 30µH Unweighted RL = 8Ω + 30µH A-weighted RL = 8Ω + 30µH Unweighted RL = 4Ω + Filter A-weighted RL = 4Ω + Filter Unweighted RL = 4Ω + Filter A-weighted RL = 4Ω + Filter 1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V. 2. Standby mode is active when VSTBY is tied to GND. 3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz. 10/41 TS4962M Table 7. Symbol ICC ISTBY VOO Electrical characteristics VCC = +3V, GND = 0V, VIC = 2.5V, Tamb = 25°C (unless otherwise specified)(1) Parameter Supply current Standby current (2) Conditions No input signal, no load No input signal, VSTBY = GND No input signal, RL = 8Ω G=6dB THD = 1% max, F = 1kHz, RL = 4Ω THD = 10% max, F = 1kHz, RL = 4Ω THD = 1% max, F = 1kHz, RL = 8Ω THD = 10% max, F = 1kHz, RL = 8Ω Pout = 350mWRMS, G = 6dB, 20Hz < F < 20kHz RL = 8Ω + 15µH, BW < 30kHz Pout = 350mWRMS, G = 6dB, F = 1kHz, RL = 8Ω + 15µH, BW < 30kHz Pout = 0.7WRMS, RL = 4Ω + ≥ 15µH Pout = 0.45WRMS, RL = 8Ω+ ≥ 15µH F = 217Hz, RL = 8Ω G=6dB, , Vripple = 200mVpp F = 217Hz, RL = 8Ω, G = 6dB, ΔVicm = 200mVpp Rin in kΩ Min. Typ. 1.9 10 3 0.75 1 0.5 0.6 1 0.21 78 88 60 Max. 2.7 1000 25 Unit mA nA mV Output offset voltage Pout Output power W Total harmonic THD + N distortion + noise % Efficiency Efficiency Power supply rejection ratio with inputs grounded (3) Common mode rejection ratio Gain value Internal resistance from Standby to GND Pulse width modulator base frequency Signal to noise ratio Wake-up time Standby time % PSRR dB CMRR Gain RSTBY FPWM SNR tWU tSTBY 54 273k Ω ----------------R in 300k Ω ----------------R in 327k Ω ----------------R in dB V/V kΩ kHz dB 10 10 ms ms 273 180 A-weighting, Pout = 0.4W, RL = 8Ω 300 250 82 5 5 327 320 11/41 Electrical characteristics Table 7. Symbol TS4962M VCC = +3V, GND = 0V, VIC = 2.5V, Tamb = 25°C (unless otherwise specified)(1) Parameter Conditions f = 20Hz to 20kHz, G = 6dB Unweighted RL = 4Ω A-weighted RL = 4Ω Unweighted RL = 8Ω A-weighted RL = 8Ω Unweighted RL = 4Ω + 15µH A-weighted RL = 4Ω + 15µH Min. Typ. Max. Unit 83 57 83 61 81 58 87 62 77 56 85 63 80 57 μVRMS VN Output Voltage Noise Unweighted RL = 4Ω + 30µH A-weighted RL = 4Ω + 30µH Unweighted RL = 8Ω + 30µH A-weighted RL = 8Ω + 30µH Unweighted RL = 4Ω + Filter A-weighted RL = 4Ω + Filter Unweighted RL = 4Ω + Filter A-weighted RL = 4Ω + Filter 1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V. 2. Standby mode is active when VSTBY is tied to GND. 3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz. 12/41 TS4962M Table 8. Symbol ICC ISTBY VOO Electrical characteristics VCC = +2.5V, GND = 0V, VIC = 2.5V, Tamb = 25°C (unless otherwise specified) Parameter Supply current Standby current (1) Conditions No input signal, no load No input signal, VSTBY = GND No input signal, RL = 8Ω G=6dB THD = 1% max, F = 1kHz, RL = 4Ω THD = 10% max, F = 1kHz, RL = 4Ω THD = 1% max, F = 1kHz, RL = 8Ω THD = 10% max, F = 1kHz, RL = 8Ω Pout = 200mWRMS, G = 6dB, 20Hz < F< 20kHz RL = 8Ω + 15µH, BW < 30kHz Pout = 200WRMS, G = 6dB, F = 1kHz, RL = 8Ω + 15µH, BW < 30kHz Pout = 0.47WRMS, RL = 4Ω + ≥ 15µH Pout = 0.3WRMS, RL = 8Ω+ ≥ 15µH F = 217Hz, RL = 8Ω G=6dB, , Vripple = 200mVpp F = 217Hz, RL = 8Ω, G = 6dB, ΔVicm = 200mVpp Rin in kΩ Min. Typ. 1.7 10 3 0.52 0.71 0.33 0.42 1 0.19 78 88 60 Max. 2.4 1000 25 Unit mA nA mV Output offset voltage Pout Output power W Total harmonic THD + N distortion + noise % Efficiency Efficiency Power supply rejection ratio with inputs grounded (2) Common mode rejection ratio Gain value Internal resistance from Standby to GND Pulse width modulator base frequency Signal to noise ratio Wake-up time Standby time % PSRR dB CMRR Gain RSTBY FPWM SNR tWU tSTBY 54 273k Ω ----------------R in 300k Ω ----------------R in 327k Ω ----------------R in dB V/V kΩ kHz dB 10 10 ms ms 273 180 A-weighting, Pout = 1.2W, RL = 8Ω 300 250 80 5 5 327 320 13/41 Electrical characteristics Table 8. Symbol TS4962M VCC = +2.5V, GND = 0V, VIC = 2.5V, Tamb = 25°C (unless otherwise specified) Parameter Conditions F = 20Hz to 20kHz, G = 6dB Unweighted RL = 4Ω A-weighted RL = 4Ω Unweighted RL = 8Ω A-weighted RL = 8Ω Unweighted RL = 4Ω + 15µH A-weighted RL = 4Ω + 15µH Min. Typ. Max. Unit 85 60 86 62 76 56 82 60 67 53 78 57 74 54 μVRMS VN Output Voltage Noise Unweighted RL = 4Ω + 30µH A-weighted RL = 4Ω + 30µH Unweighted RL = 8Ω + 30µH A-weighted RL = 8Ω + 30µH Unweighted RL = 4Ω + Filter A-weighted RL = 4Ω + Filter Unweighted RL = 4Ω + Filter A-weighted RL = 4Ω + Filter 1. Standby mode is active when VSTBY is tied to GND. 2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the superimposed sinusoidal signal to VCC @ F = 217Hz. 14/41 TS4962M Table 9. Symbol ICC ISTBY VOO Electrical characteristics VCC = +2.4V, GND = 0V, VIC = 2.5V, Tamb = 25°C (unless otherwise specified) Parameter Supply current Standby current (1) Conditions No input signal, no load No input signal, VSTBY = GND No input signal, RL = 8Ω G=6dB THD = 1% max, F = 1kHz, RL = 4Ω THD = 10% max, F = 1kHz, RL = 4Ω THD = 1% max, F = 1kHz, RL = 8Ω THD = 10% max, F = 1kHz, RL = 8Ω Pout = 200mWRMS, G = 6dB, 20Hz < F< 20kHz RL = 8Ω + 15µH, BW < 30kHz Pout = 0.38WRMS, RL = 4Ω + ≥ 15µH Pout = 0.25WRMS, RL = 8Ω+ ≥ 15µH F = 217Hz, RL = 8Ω, G = 6dB, ΔVicm = 200mVpp Rin in kΩ Min. Typ. 1.7 10 3 0.48 0.65 0.3 0.38 1 77 86 54 Max. Unit mA nA mV Output offset voltage Pout Output power W THD + N Total harmonic distortion + noise % % dB 327k Ω ----------------R in Efficiency Efficiency CMRR Gain RSTBY FPWM SNR tWU tSTBY Common mode rejection ratio Gain value Internal resistance from Standby to GND Pulse width modulator base frequency Signal to noise ratio Wake-up time Standby time 273k Ω ----------------R in 300k Ω ----------------R in V/V kΩ kHz dB ms ms 273 300 250 327 A Weighting, Pout = 1.2W, RL = 8Ω 80 5 5 F = 20Hz to 20kHz, G = 6dB Unweighted RL = 4Ω A-weighted RL = 4Ω Unweighted RL = 8Ω A-weighted RL = 8Ω Unweighted RL = 4Ω + 15µH A-weighted RL = 4Ω + 15µH VN Output voltage noise Unweighted RL = 4Ω + 30µH A-weighted RL = 4Ω + 30µH Unweighted RL = 8Ω + 30µH A-weighted RL = 8Ω + 30µH Unweighted RL = 4Ω + Filter A-weighted RL = 4Ω + Filter Unweighted RL = 4Ω + Filter A-weighted RL = 4Ω + Filter 1. Standby mode is active when VSTBY is tied to GND. 85 60 86 62 76 56 82 60 67 53 78 57 74 54 μVRMS 15/41 Electrical characteristic curves TS4962M 4 Electrical characteristic curves The graphs included in this section use the following abbreviations: ● ● ● RL + 15μH or 30μH = pure resistor + very low series resistance inductor Filter = LC output filter (1µF+30µH for 4Ω and 0.5µF+60µH for 8Ω) All measurements done with Cs1=1µF and Cs2=100nF except for PSRR where Cs1 is removed. Test diagram for measurements Vcc 1uF Cs1 + 100nF Cs2 Figure 2. Cin GND Rin GND In+ Out+ 15uH or 30uH TS4962 or LC Filter Out4 or 8 Ohms 5th order RL 50kHz low pass filter 150k Cin Rin 150k In- GND Audio Measurement Bandwidth < 30kHz Figure 3. Test diagram for PSRR measurements 100nF Cs2 20Hz to 20kHz Vcc GND 4.7uF GND Rin In+ 150k TS4962 4.7uF Rin 150k GND GND 5th order 50kHz low pass filter Reference RMS Selective Measurement Bandwidth=1% of Fmeas InOutOut+ 15uH or 30uH or LC Filter 4 or 8 Ohms 5th order RL 50kHz low pass filter 16/41 TS4962M Electrical characteristic curves Figure 4. Current consumption vs. power supply voltage Figure 5. Current consumption vs. standby voltage 2.5 No load Tamb=25°C Current Consumption (mA) 2.5 2.0 Current Consumption (mA) 2.0 1.5 1.5 1.0 1.0 0.5 0.5 0.0 0.0 Vcc = 5V No load Tamb=25°C 0 1 2 3 4 5 Standby Voltage (V) 0 1 2 3 4 5 Power Supply Voltage (V) Figure 6. Current consumption vs. standby voltage Figure 7. Output offset voltage vs. common mode input voltage 2.0 10 G = 6dB Tamb = 25°C Current Consumption (mA) 1.5 Voo (mV) 8 6 Vcc=5V Vcc=3.6V 1.0 4 0.5 Vcc = 3V No load Tamb=25°C 0.5 1.0 1.5 2.0 2.5 3.0 Standby Voltage (V) 2 Vcc=2.5V 0.0 0.0 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Common Mode Input Voltage (V) Figure 8. 100 Efficiency vs. output power Figure 9. 100 Efficiency vs. output power 200 Efficiency 600 Power Dissipation (mW) 500 400 300 150 Efficiency (%) 60 100 40 Power Dissipation Vcc=3V 50 RL=4Ω + ≥ 15μH F=1kHz THD+N≤1% 0 0.2 0.3 0.4 0.5 0.6 0.7 Output Power (W) 60 40 200 Vcc=5V RL=4Ω + ≥ 15μH 100 F=1kHz THD+N≤1% 0 1.0 1.5 2.0 2.3 Output Power (W) Power Dissipation 20 20 0 0.0 0.5 0 0.0 0.1 Power Dissipation (mW) 80 Efficiency 80 Efficiency (%) 17/41 Electrical characteristic curves TS4962M Figure 10. Efficiency vs. output power 100 150 Figure 11. Efficiency vs. output power 100 75 Efficiency Efficiency Efficiency (%) Efficiency (%) 60 100 50 60 40 Power Dissipation Vcc=5V RL=8Ω + ≥ 15μH F=1kHz THD+N≤1% 0.2 0.4 0.6 0.8 Output Power (W) 1.0 1.2 40 Power Dissipation 25 Vcc=3V RL=8Ω + ≥ 15μH F=1kHz THD+N≤1% 0.4 0 0.5 50 20 20 0 0.0 0 1.4 0 0.0 0.1 0.2 0.3 Output Power (W) Figure 12. Output power vs. power supply voltage 3.5 RL = 4Ω + ≥ 15μH F = 1kHz 3.0 BW < 30kHz Tamb = 25°C 2.5 2.0 1.5 THD+N=1% 1.0 0.5 0.0 Figure 13. Output power vs. power supply voltage 2.0 THD+N=10% Output power (W) Output power (W) RL = 8Ω + ≥ 15μH F = 1kHz BW < 30kHz 1.5 Tamb = 25°C THD+N=10% 1.0 0.5 THD+N=1% 2.5 3.0 3.5 4.0 Vcc (V) 4.5 5.0 5.5 0.0 2.5 3.0 3.5 4.0 Vcc (V) 4.5 5.0 5.5 Figure 14. PSRR vs. frequency 0 -10 -20 PSRR (dB) Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7μF RL = 4Ω + 15μH ΔR/R≤0.1% Tamb = 25°C Vcc=5V, 3.6V, 2.5V Figure 15. PSRR vs. frequency 0 -10 -20 PSRR (dB) Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7μF RL = 4Ω + 30μH ΔR/R≤0.1% Tamb = 25°C -30 -40 -50 -60 -70 -80 20 -30 -40 Vcc=5V, 3.6V, 2.5V -50 -60 -70 100 1000 Frequency (Hz) 10000 20k -80 20 100 1000 Frequency (Hz) 10000 20k 18/41 Power Dissipation (mW) Power Dissipation (mW) 80 80 TS4962M Electrical characteristic curves Figure 16. PSRR vs. frequency 0 -10 -20 PSRR (dB) Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7μF RL = 4Ω + Filter ΔR/R≤0.1% Tamb = 25°C Figure 17. PSRR vs. frequency 0 -10 -20 PSRR (dB) Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7μF RL = 8Ω + 15μH ΔR/R≤0.1% Tamb = 25°C -30 -40 -30 -40 -50 -60 -70 Vcc=5V, 3.6V, 2.5V -50 -60 -70 -80 20 100 1000 Frequency (Hz) 10000 20k Vcc=5V, 3.6V, 2.5V -80 20 100 1000 Frequency (Hz) 10000 20k Figure 18. PSRR vs. frequency 0 -10 -20 PSRR (dB) Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7μF RL = 8Ω + 30μH ΔR/R≤0.1% Tamb = 25°C Figure 19. PSRR vs. frequency 0 -10 -20 PSRR (dB) Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7μF ΔR/R≤0.1% RL = 8Ω + Filter Tamb = 25°C -30 -40 -50 -60 -70 -80 20 -30 -40 -50 -60 -70 -80 20 Vcc=5V, 3.6V, 2.5V Vcc=5V, 3.6V, 2.5V 100 1000 Frequency (Hz) 10000 20k 100 1000 Frequency (Hz) 10000 20k Figure 20. PSRR vs. common mode input voltage 0 -10 -20 PSRR(dB) Figure 21. CMRR vs. frequency 0 Vripple = 200mVpp F = 217Hz, G = 6dB RL ≥ 4Ω + ≥ 15μH Tamb = 25°C Vcc=2.5V -20 CMRR (dB) -30 -40 -50 -60 -70 Vcc=5V -80 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Vcc=3.6V RL=4Ω + 15μH G=6dB ΔVicm=200mVpp ΔR/R≤0.1% Cin=4.7μF Tamb = 25°C Vcc=5V, 3.6V, 2.5V -40 -60 20 100 Common Mode Input Voltage (V) 1000 Frequency (Hz) 10000 20k 19/41 Electrical characteristic curves TS4962M Figure 22. CMRR vs. frequency 0 RL=4Ω + 30μH G=6dB ΔVicm=200mVpp ΔR/R≤0.1% Cin=4.7μF Tamb = 25°C Figure 23. CMRR vs. frequency 0 RL=4Ω + Filter G=6dB ΔVicm=200mVpp ΔR/R≤0.1% Cin=4.7μF Tamb = 25°C -20 CMRR (dB) -20 CMRR (dB) -40 Vcc=5V, 3.6V, 2.5V -40 Vcc=5V, 3.6V, 2.5V -60 -60 20 100 1000 Frequency (Hz) 10000 20k 20 100 1000 Frequency (Hz) 10000 20k Figure 24. CMRR vs. frequency 0 RL=8Ω + 15μH G=6dB ΔVicm=200mVpp ΔR/R≤0.1% Cin=4.7μF Tamb = 25°C Figure 25. CMRR vs. frequency 0 RL=8Ω + 30μH G=6dB ΔVicm=200mVpp ΔR/R≤0.1% Cin=4.7μF Tamb = 25°C -20 CMRR (dB) -20 CMRR (dB) -40 Vcc=5V, 3.6V, 2.5V -40 Vcc=5V, 3.6V, 2.5V -60 -60 20 100 1000 Frequency (Hz) 10000 20k 20 100 1000 Frequency (Hz) 10000 20k Figure 26. CMRR vs. frequency Figure 27. CMRR vs. common mode input voltage -20 0 RL=8Ω + Filter G=6dB ΔVicm=200mVpp ΔR/R≤0.1% Cin=4.7μF Tamb = 25°C -30 CMRR(dB) -20 CMRR (dB) -40 ΔVicm = 200mVpp F = 217Hz G = 6dB RL ≥ 4Ω + ≥ 15μH Tamb = 25°C Vcc=2.5V -40 Vcc=5V, 3.6V, 2.5V -50 Vcc=3.6V -60 -60 -70 0.0 Vcc=5V 20 100 1000 Frequency (Hz) 10000 20k 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Common Mode Input Voltage (V) 20/41 TS4962M Electrical characteristic curves Figure 28. THD+N vs. output power 10 RL = 4Ω + 15μH F = 100Hz G = 6dB BW < 30kHz Tamb = 25°C 1 Vcc=5V Vcc=3.6V Figure 29. THD+N vs. output power 10 RL = 4Ω + 30μH or Filter F = 100Hz G = 6dB BW < 30kHz Tamb = 25°C 1 Vcc=5V Vcc=3.6V Vcc=2.5V THD + N (%) 0.1 THD + N (%) Vcc=2.5V 0.1 1E-3 0.01 0.1 Output Power (W) 1 3 1E-3 0.01 0.1 Output Power (W) 1 3 Figure 30. THD+N vs. output power 10 RL = 8Ω + 15μH F = 100Hz G = 6dB BW < 30kHz Tamb = 25°C 1 Vcc=5V Vcc=3.6V Vcc=2.5V Figure 31. THD+N vs. output power 10 RL = 8Ω + 30μH or Filter F = 100Hz G = 6dB BW < 30kHz Tamb = 25°C 1 Vcc=5V Vcc=3.6V Vcc=2.5V THD + N (%) 0.1 THD + N (%) 0.1 1E-3 0.01 0.1 Output Power (W) 1 2 1E-3 0.01 0.1 Output Power (W) 1 2 Figure 32. THD+N vs. output power 10 RL = 4Ω + 15μH F = 1kHz G = 6dB BW < 30kHz Tamb = 25°C 1 Vcc=5V Vcc=3.6V Vcc=2.5V Figure 33. THD+N vs. output power 10 RL = 4Ω + 30μH or Filter F = 1kHz G = 6dB BW < 30kHz Tamb = 25°C 1 Vcc=5V Vcc=3.6V Vcc=2.5V THD + N (%) 0.1 1E-3 THD + N (%) 0.01 0.1 Output Power (W) 1 3 0.1 1E-3 0.01 0.1 Output Power (W) 1 3 21/41 Electrical characteristic curves TS4962M Figure 34. THD+N vs. output power 10 RL = 8Ω + 15μH F = 1kHz G = 6dB BW < 30kHz Tamb = 25°C 1 Vcc=5V Vcc=3.6V Vcc=2.5V Figure 35. THD+N vs. output power 10 RL = 8Ω + 30μH or Filter F = 1kHz G = 6dB BW < 30kHz Tamb = 25°C 1 Vcc=5V Vcc=3.6V Vcc=2.5V THD + N (%) 0.1 1E-3 THD + N (%) 0.01 0.1 Output Power (W) 1 2 0.1 1E-3 0.01 0.1 Output Power (W) 1 2 Figure 36. THD+N vs. frequency 10 RL=4Ω + 15μH G=6dB Bw < 30kHz Vcc=5V Tamb = 25°C 1 Figure 37. THD+N vs. frequency 10 RL=4Ω + 30μH or Filter G=6dB Bw < 30kHz Vcc=5V Tamb = 25°C 1 Po=1.5W Po=1.5W 0.1 Po=0.75W THD + N (%) THD + N (%) 0.1 10000 20k Po=0.75W 50 100 1000 Frequency (Hz) 50 100 1000 Frequency (Hz) 10000 20k Figure 38. THD+N vs. frequency 10 RL=4Ω + 15μH G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25°C 1 Figure 39. THD+N vs. frequency 10 RL=4Ω + 30μH or Filter G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25°C 1 Po=0.9W Po=0.9W THD + N (%) Po=0.45W THD + N (%) Po=0.45W 0.1 0.1 50 100 1000 Frequency (Hz) 10000 20k 50 100 1000 Frequency (Hz) 10000 20k 22/41 TS4962M Electrical characteristic curves Figure 40. THD+N vs. frequency 10 RL=4Ω + 15μH G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25°C 1 Figure 41. THD+N vs. frequency 10 RL=4Ω + 30μH or Filter G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25°C 1 Po=0.4W Po=0.4W Po=0.2W THD + N (%) THD + N (%) Po=0.2W 0.1 0.1 200 1000 Frequency (Hz) 10000 20k 50 100 1000 Frequency (Hz) 10000 20k Figure 42. THD+N vs. frequency 10 RL=8Ω + 15μH G=6dB Bw < 30kHz Vcc=5V Tamb = 25°C 1 Figure 43. THD+N vs. frequency 10 RL=8Ω + 30μH or Filter G=6dB Bw < 30kHz Vcc=5V Tamb = 25°C 1 THD + N (%) THD + N (%) Po=0.9W Po=0.9W 0.1 Po=0.45W 0.1 Po=0.45W 50 100 1000 Frequency (Hz) 10000 20k 50 100 1000 Frequency (Hz) 10000 20k Figure 44. THD+N vs. frequency 10 RL=8Ω + 15μH G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25°C 1 Figure 45. THD+N vs. frequency 10 RL=8Ω + 30μH or Filter G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25°C 1 Po=0.5W THD + N (%) 0.1 THD + N (%) Po=0.5W Po=0.25W 0.1 Po=0.25W 50 100 1000 Frequency (Hz) 10000 20k 50 100 1000 Frequency (Hz) 10000 20k 23/41 Electrical characteristic curves TS4962M Figure 46. THD+N vs. frequency 10 RL=8Ω + 15μH G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25°C Figure 47. THD+N vs. frequency 10 RL=8Ω + 30μH or Filter G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25°C 1 THD + N (%) Po=0.2W Po=0.2W 1 THD + N (%) 0.1 0.1 Po=0.1W Po=0.1W 0.01 50 100 1000 Frequency (Hz) 10000 20k 0.01 50 100 1000 Frequency (Hz) 10000 20k Figure 48. Gain vs. frequency 8 Figure 49. Gain vs. frequency 8 Differential Gain (dB) 4 Vcc=5V, 3.6V, 2.5V Differential Gain (dB) 6 6 4 Vcc=5V, 3.6V, 2.5V 2 RL=4Ω + 15μH G=6dB Vin=500mVpp Cin=1μF Tamb = 25°C 20 100 1000 Frequency (Hz) 10000 20k 2 RL=4Ω + 30μH G=6dB Vin=500mVpp Cin=1μF Tamb = 25°C 20 100 1000 Frequency (Hz) 10000 20k 0 0 Figure 50. Gain vs. frequency 8 Figure 51. Gain vs. frequency 8 Differential Gain (dB) Differential Gain (dB) 6 6 Vcc=5V, 3.6V, 2.5V 4 RL=8Ω + 15μH G=6dB Vin=500mVpp Cin=1μF Tamb = 25°C 20 100 1000 Frequency (Hz) 10000 20k 4 Vcc=5V, 3.6V, 2.5V 2 RL=4Ω + Filter G=6dB Vin=500mVpp Cin=1μF Tamb = 25°C 20 100 1000 Frequency (Hz) 10000 20k 2 0 0 24/41 TS4962M Electrical characteristic curves Figure 52. Gain vs. frequency 8 Figure 53. Gain vs. frequency 8 Differential Gain (dB) Vcc=5V, 3.6V, 2.5V 4 RL=8Ω + 30μH G=6dB Vin=500mVpp Cin=1μF Tamb = 25°C 20 100 1000 Frequency (Hz) 10000 20k Differential Gain (dB) 6 6 Vcc=5V, 3.6V, 2.5V 4 RL=8Ω + Filter G=6dB Vin=500mVpp Cin=1μF Tamb = 25°C 20 100 1000 Frequency (Hz) 10000 20k 2 2 0 0 Figure 54. Gain vs. frequency Figure 55. Startup & shutdown time VCC = 5V, G = 6dB, Cin = 1µF (5ms/div) 8 Vo1 Differential Gain (dB) 6 Vcc=5V, 3.6V, 2.5V 4 RL=No Load G=6dB Vin=500mVpp Cin=1μF Tamb = 25°C 20 100 1000 Frequency (Hz) 10000 20k Vo2 Standby Vo1-Vo2 2 0 25/41 Electrical characteristic curves TS4962M Figure 56. Startup & shutdown time VCC = 3V, G = 6dB, Cin = 1µF (5ms/div) Figure 57. Startup & shutdown time VCC = 5V, G = 6dB, Cin = 100nF (5ms/div) Vo1 Vo1 Vo2 Vo2 Standby Standby Vo1-Vo2 Vo1-Vo2 Figure 58. Startup & shutdown time VCC = 3V, G = 6dB, Cin = 100nF (5ms/div) Vo1 Figure 59. Startup & shutdown time VCC = 5V, G = 6dB, No Cin (5ms/div) Vo1 Vo2 Vo2 Standby Standby Vo1-Vo2 Vo1-Vo2 26/41 TS4962M Electrical characteristic curves Figure 60. Startup & shutdown time VCC = 3V, G = 6dB, No Cin (5ms/div) Vo1 Vo2 Standby Vo1-Vo2 27/41 Application information TS4962M 5 5.1 Application information Differential configuration principle The TS4962M is a monolithic fully-differential input/output class D power amplifier. The TS4962M also includes a common-mode feedback loop that controls the output bias value to average it at VCC/2 for any DC common mode input voltage. This allows the device to always have a maximum output voltage swing, and by consequence, maximizes the output power. Moreover, as the load is connected differentially compared to a single-ended topology, the output is four times higher for the same power supply voltage. The advantages of a full-differential amplifier are: ● ● ● ● ● High PSRR (power supply rejection ratio). High common mode noise rejection. Virtually zero pop without additional circuitry, giving a faster start-up time compared to conventional single-ended input amplifiers. Easier interfacing with differential output audio DAC. No input coupling capacitors required due to common mode feedback loop. As the differential function is directly linked to external resistor mismatching, paying particular attention to this mismatching is mandatory in order to obtain the best performance from the amplifier. The main disadvantage is: ● 5.2 Gain in typical application schematic Typical differential applications are shown in Figure 1 on page 4. In the flat region of the frequency-response curve (no input coupling capacitor effect), the differential gain is expressed by the relation: AV diff 300 -----------------------------= Out – Out- = --------+ R in In – In + - with Rin expressed in kΩ. Due to the tolerance of the internal 150kΩ feedback resistor, the differential gain will be in the range (no tolerance on Rin): 273 --------- ≤ A V ≤ 327 --------diff R in R in 28/41 TS4962M Application information 5.3 Common mode feedback loop limitations As explained previously, the common mode feedback loop allows the output DC bias voltage to be averaged at VCC/2 for any DC common mode bias input voltage. However, due to Vicm limitation in the input stage (see Table 2: Operating conditions on page 3), the common mode feedback loop can ensure its role only within a defined range. This range depends upon the values of VCC and Rin (AVdiff). To have a good estimation of the Vicm value, we can apply this formula (no tolerance on Rin): V CC × R in + 2 × V IC × 150k Ω V icm = ----------------------------------------------------------------------------2 × ( R in + 150k Ω) (V) with In + In V IC = --------------------2 + - (V) and the result of the calculation must be in the range: 0.5V ≤ V icm ≤ V CC – 0.8V Due to the +/-9% tolerance on the 150kΩ resistor, it’s also important to check Vicm in these conditions: V CC × R in + 2 × V IC × 163.5k Ω V CC × R in + 2 × V IC × 136.5k Ω ---------------------------------------------------------------------------------- ≤ V icm ≤ ---------------------------------------------------------------------------------2 × ( R in + 136.5k Ω) 2 × ( R in + 163.5k Ω) If the result of Vicm calculation is not in the previous range, input coupling capacitors must be used (with VCC from 2.4V to 2.5V, input coupling capacitors are mandatory). For example: With VCC = 3V, Rin = 150k and VIC = 2.5V, we typically find Vicm = 2V and this is lower than 3V - 0.8V = 2.2V. With 136.5kΩ we find 1.97V, and with 163.5kΩ we have 2.02V. So, no input coupling capacitors are required. 5.4 Low frequency response If a low frequency bandwidth limitation is requested, it is possible to use input coupling capacitors. In the low frequency region, Cin (input coupling capacitor) starts to have an effect. Cin forms, with Rin, a first order high-pass filter with a -3dB cut-off frequency: 1 F CL = ------------------------------------2 π × R in × C in (Hz) So, for a desired cut-off frequency we can calculate Cin, 1 C in = --------------------------------------2 π × R in × F CL (F) with Rin in Ω and FCL in Hz. 29/41 Application information TS4962M 5.5 Decoupling of the circuit A power supply capacitor, referred to as CS, is needed to correctly bypass the TS4962M. The TS4962M has a typical switching frequency at 250kHz and output fall and rise time about 5ns. Due to these very fast transients, careful decoupling is mandatory. A 1µF ceramic capacitor is enough, but it must be located very close to the TS4962M in order to avoid any extra parasitic inductance created an overly long track wire. In relation with dI/dt, this parasitic inductance introduces an overvoltage that decreases the global efficiency and, if it is too high, may cause a breakdown of the device. In addition, even if a ceramic capacitor has an adequate high frequency ESR value, its current capability is also important. A 0603 size is a good compromise, particularly when a 4Ω load is used. Another important parameter is the rated voltage of the capacitor. A 1µF/6.3V capacitor used at 5V, loses about 50% of its value. In fact, with a 5V power supply voltage, the decoupling value is about 0.5µF instead of 1µF. As CS has particular influence on the THD+N in the medium-high frequency region, this capacitor variation becomes decisive. In addition, less decoupling means higher overshoots, which can be problematic if they reach the power supply AMR value (6V). 5.6 Wake-up time (tWU) When the standby is released to set the device ON, there is a wait of about 5ms. The TS4962M has an internal digital delay that mutes the outputs and releases them after this time in order to avoid any pop noise. 5.7 Shutdown time (tSTBY) When the standby command is set, the time required to put the two output stages into high impedance and to put the internal circuitry in shutdown mode, is about 5ms. This time is used to decrease the gain and avoid any pop noise during shutdown. 5.8 Consumption in shutdown mode Between the shutdown pin and GND there is an internal 300kΩ resistor. This resistor forces the TS4962M to be in standby mode when the standby input pin is left floating. However, this resistor also introduces additional power consumption if the shutdown pin voltage is not 0V. For example, with a 0.4V standby voltage pin, Table 2: Operating conditions on page 3, shows that you must add 0.4V/300kΩ = 1.3µA in typical (0.4V/273kΩ = 1.46µA in maximum) to the shutdown current specified in Table 4 on page 5. 5.9 Single-ended input configuration It is possible to use the TS4962M in a single-ended input configuration. However, input coupling capacitors are needed in this configuration. The schematic in Figure 61 shows a single-ended input typical application. 30/41 TS4962M Figure 61. Single-ended input typical application Vcc Application information B1 Ve Standby B2 Vcc Cs 1u C2 Stdby 300k Internal Bias 150k Out+ C3 Output PWM H Bridge SPEAKER 150k Oscillator GND TS4962 B3 A2 GND GND Cin GND Rin C1 A1 Rin Cin GND InIn+ + - A3 Out- All formulas are identical except for the gain (with Rin in kΩ) : AV sin gle Ve 300 = ------------------------------ = --------+ R in Out – Out And, due to the internal resistor tolerance we have: 273 327 --------- ≤ A V ≤ --------sin gle R in R in In the event that multiple single-ended inputs are summed, it is important that the impedance on both TS4962M inputs (In- and In+) are equal. Figure 62. Typical application schematic with multiple single-ended inputs Vcc Vek Cink GND Ve1 Cin1 Rin1 C1 Standby Rink C2 Stdby 300k Internal Bias 150k Out+ C3 Output PWM H Bridge SPEAKER 150k Oscillator TS4962 GND A2 B3 GND A3 OutGND B1 Vcc B2 Cs 1u A1 GND Ceq Req InIn+ + - GND 31/41 Application information We have the following equations: + 300 300 Out – Out = V e1 × ------------ + …+ V ek × -----------R ink R in1 k (V) TS4962M C eq = j=1 Σ C inj C inj 1 = -----------------------------------------------------2× π× R × F inj CLj (F) 1R eq = -----------------k j =1 ∑ ---------Rinj 1 In general, for mixed situations (single-ended and differential inputs), it is best to use the same rule, that is, to equalize impedance on both TS4962M inputs. 5.10 Output filter considerations The TS4962M is designed to operate without an output filter. However, due to very sharp transients on the TS4962M output, EMI radiated emissions may cause some standard compliance issues. These EMI standard compliance issues can appear if the distance between the TS4962M outputs and loudspeaker terminal is long (typically more than 50mm, or 100mm in both directions, to the speaker terminals). As the PCB layout and internal equipment device are different for each configuration, it is difficult to provide a one-size-fits-all solution. However, to decrease the probability of EMI issues, there are several simple rules to follow: ● ● ● Reduce, as much as possible, the distance between the TS4962M output pins and the speaker terminals. Use ground planes for “shielding” sensitive wires. Place, as close as possible to the TS4962M and in series with each output, a ferrite bead with a rated current at minimum 2A and impedance greater than 50Ω at frequencies above 30MHz. If, after testing, these ferrite beads are not necessary, replace them by a short-circuit. Murata BLM18EG221SN1 or BLM18EG121SN1 are possible examples of devices you can use. Allow enough footprint to place, if necessary, a capacitor to short perturbations to ground (see the schematics in Figure 63). ● Figure 63. Method for shorting pertubations to ground Ferrite chip bead From TS4962 output about 100pF Gnd To speaker 32/41 TS4962M Application information In the case where the distance between the TS4962M outputs and speaker terminals is high, it is possible to have low frequency EMI issues due to the fact that the typical operating frequency is 250kHz. In this configuration, we recommend using an output filter (as shown in Figure 1: Typical application schematics on page 4). It should be placed as close as possible to the device. 5.11 Different examples with summed inputs Example 1: Dual differential inputs Figure 64. Typical application schematic with dual differential inputs Vcc Standby C2 Stdby 300k R2 E2+ R1 E1+ E1R1 E2R2 150k Oscillator GND B3 A2 GND TS4962 OutC1 Internal Bias 150k Out+ C3 Output PWM H Bridge SPEAKER A3 GND B1 Vcc B2 Cs 1u A1 InIn+ + - With (Ri in kΩ): 300 Out – OutA V = ------------------------------ = --------1 + R1 E1 – E1 300 Out – OutA V = ------------------------------ = --------2 + R2 E2 – E2 V CC × R 1 × R 2 + 300 × ( V IC1 × R 2 + V IC2 × R 1 ) 0.5V ≤ ------------------------------------------------------------------------------------------------------------------------------- ≤ V CC – 0.8V 300 × ( R 1 + R 2 ) + 2 × R 1 × R 2 E1 + E1 E2 + E2 V IC = ------------------------ and V IC = -----------------------1 2 2 2 + + + + - 33/41 Application information TS4962M Example 2: One differential input plus one single-ended input Figure 65. Typical application schematic with one differential input plus one singleended input Vcc Standby C2 Stdby 300k R2 E2+ C1 E1+ E2R2 150k GND C1 R1 Oscillator GND A2 B3 GND TS4962 OutR1 C1 Internal Bias 150k Out+ C3 Output PWM H Bridge SPEAKER A3 GND B1 Vcc B2 Cs 1u A1 InIn+ + - With (Ri in kΩ): 300 A V = Out – Out- = -------------------------------------1 + R1 E1 300 Out – OutA V = ------------------------------ = --------2 + R2 E2 – E2 1 C 1 = ------------------------------------2 π × R 1 × F CL (F) + + - 34/41 TS4962M Demoboard 6 Demoboard A demoboard for the TS4962M is available with a flip-chip to DIP adapter. For more information about this demoboard, refer to Application Note AN2134. Figure 66. Schematic diagram of mono class D demoboard for TS4962M Vcc Cn1 + J1 Cn2 Vcc GND Cn4 + J2 GND 4 Stdby C2 Cn3 Positive Input Negative input 100nF 150k 100nF R2 C3 150k 5 InIn+ 1 300k R1 Internal Bias 150k Out+ 6 Output PWM H Bridge 10 OutCn6 Positive Output Negative Output + 150k Oscillator Cn5 + J3 Figure 67. Diagram for flip-chip-to-DIP adapter Pin3 pin8 OR C1 100nF B1 Vcc 300k Pin4 C2 Stdby Internal Bias 150k B2 Out+ C3 Output PWM H Bridge Pin10 Pin6 Pin5 Pin1 C1 A1 InIn+ + 150k Oscillator - A3 Out- GND A2 B3 R2 OR Pin2 Pin9 TS4962 + + GND R1 1 2 3 C1 2.2uF/10V Vcc 3 Vcc 8 U1 GND 2 GND 3 TS4962 Flip-Chip to DIP Adapter C2 1uF 35/41 Demoboard Figure 68. Top view TS4962M Figure 69. Bottom layer Figure 70. Top layer 36/41 TS4962M Footprint recommendations 7 Footprint recommendations Figure 71. Footprint recommendations 500μm Φ=250μm 500μm 75µm min. 100μm max. Track 500μm Φ=400μm typ. Φ=340μm min. 150μm min. Non Solder mask opening 500μm Pad Pad in Cu 18μm with Flash NiAu (2-6μm, 0.2μm max.) 37/41 Package information TS4962M 8 Package information In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com. Figure 72. Pin-out for 9-bump flip-chip (top view) IN+ 1/A1 VDD 4/B1 IN7/C1 GND 2/A2 VDD 5/B2 STBY 8/C2 OUT3/A3 GND 6/B3 OUT+ 9/C3 ■ ■ Bumps are underneath Bump diameter = 300μm Figure 73. Marking for 9-bump flip-chip (top view) ■ ST Logo E ■ ■ ■ Symbol for lead-free: E Two first XX product code: 62 third X: Assembly code Three digits date code: Y for year - WW for week The dot is for marking pin A1 XXX YWW ■ ■ Figure 74. Mechanical data for 9-bump flip-chip 1.60 mm ■ ■ ■ 1.60 mm Die size: 1.6mm x 1.6mm ±30μm Die height (including bumps): 600μm Bump diameter: 315μm ±50μm Bump diameter before reflow: 300μm ±10μm Bump height: 250μm ±40μm Die height: 350μm ±20μm Pitch: 500μm ±50μm Coplanarity: 50μm max ■ ■ ■ 0.5mm 0.5mm ∅ 0.25mm ■ ■ 600µm 38/41 TS4962M Ordering information 9 Ordering information Table 10. Order codes Temperature range -40°C to +85°C Package Lead-free flip-chip Packing Tape & reel Marking 62 Part number TS4962MEIJT 39/41 Revision history TS4962M 10 Revision history Date Oct. 2005 Nov. 2005 Dec. 2005 10-Jan-2007 Revision 1 2 3 4 Changes First release corresponding to the product preview version. Electrical data updated for output voltage noise, see Table 4, Table 5, Table 6, Table 7, Table 8 andTable 9 Formatting changes throughout. Product in full production. Template update, no technical changes. 40/41 TS4962M Please Read Carefully: 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. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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