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| TS472 Very low noise microphone preamplifier with 2.0V bias output and active low standby mode Features Flip-chip - 12 bumps Low noise: 10nV/ typ. equivalent input Hz noise @ F = 1kHz Fully differential input/output 2.2V to 5.5V single supply operation Low power consumption @20dB: 1.8mA Fast start up time @ 0dB: 5ms typ. Low distortion: 0.1% typ. 40kHz bandwidth regardless of the gain Active low standby mode function (1A max) Low noise 2.0V microphone bias output Available in flip-chip lead-free package and in QFN24 4x4mm package ESD protection (2kV) QFN24 C1 C2 STDBY VCC Pin Connections (top view) OUTPUT BIAS GS OUT+ OUT- IN+ IN- GND BYPASS Description The TS472 is a differential-input microphone preamplifier optimized for high-performance, PDA and notebook audio systems. This device features an adjustable gain from 0dB to 40dB with excellent power-supply and common-mode rejection ratios. In addition, the TS472 has a very low-noise microphone bias generator of 2V. It also includes a complete shutdown function, with active low standby mode. Pin Connection (top view) Applications Video and photo cameras with sound input Sound acquisition & voice recognition Video conference systems Notebook computers and PDAs September 2006 Rev 4 1/24 www.st.com 24 Contents TS472 Contents 1 2 3 4 5 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Higher cut-off frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Lower cut-off frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Low-noise microphone bias source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Gain settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Wake-up time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Demo board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 6.1 6.2 Flip-chip package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 QFN24 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2/24 TS472 Ordering information 1 Ordering information Table 1. Order codes Temperature range -40C, +85C -40C, +85C Package Flip-chip QFN24 4x4mm Packing Tape & reel Tape & reel Marking 472 K472 Part number TS472EIJT TS472IQT 3/24 Typical application schematic TS472 2 Typical application schematic Figure 1 shows a typical application schematic for the TS472. Figure 1. Application schematic (flip-chip) Table 2. External component descriptions Functional description Input coupling capacitors that block the DC voltage at the amplifier input terminal. Output coupling capacitors that block the DC voltage coming from the amplifier output terminal (pins C2 and D2) and determine Lower cut-off frequency. Output load resistors used to charge the output coupling capacitors Cout. These output resistors can be represented by an input impedance of a following stage. Polarizing resistors for biasing of a microphone. Supply bypass capacitor that provides power supply filtering. Bypass pin capacitor that provides half-supply filtering. Low pass filter capacitors allowing to cut the high frequency. Components Cin+, Cin- Cout+, Cout- Rout+, RoutRpos, Rneg Cs Cb C1, C2 4/24 TS472 Absolute maximum ratings 3 Absolute maximum ratings Table 3. Symbol VCC Vi Toper Tstg Tj Rthja ESD ESD Supply voltage (1) Input voltage Operating free air temperature range Storage temperature Maximum junction temperature Thermal resistance junction to ambient: Flip-chip QFN24 Human body model Machine model Lead temperature (soldering, 10sec) 1. All voltages values are measured with respect to the ground pin. Absolute maximum ratings Parameter Value 6 -0.3 to VCC+0.3 -40 to + 85 -65 to +150 150 180 110 2 200 250 Unit V V C C C C/W kV V C Table 4. Symbol VCC A VSTBY Top Rthja Operating conditions Parameter Supply voltage Typical differential gain (GS connected to 4.7k or bias) Standby voltage input: Device ON Device OFF Operational free air temperature range Thermal resistance junction to ambient: Flip-chip QFN24 Value 2.2 to 5.5 20 1.5 VSTBY VCC GND VSTBY 0.4 -40 to +85 150 60 Unit V dB V C C/W 5/24 Electrical characteristics TS472 4 Electrical characteristics Table 5. Symbol en THD+N Vin BW Electrical characteristics at VCC = 3V with GND = 0V, Tamb = 25C (unless otherwise specified) Parameter Equivalent input noise voltage density REQ=100 at 1KHz Total harmonic distortion + noise 20Hz F 20kHz, Gain=20dB, Vin=50mVRMS Input voltage, Gain=20dB Bandwidth @ -3dB Bandwidth @ -1dB pin A3, B3 floating Overall output voltage gain (Rgs variable): Minimum gain, Rgs infinite Maximum gain, Rgs=0 Input impedance referred to GND Resistive load Capacitive load Supply current, Gain=20dB Standby current Power supply rejection ratio, Gain=20dB, F=217Hz, Vripple=200mVpp, inputs grounded Differential output Single-ended outputs, 1.8 -3 39.5 80 10 100 2.4 1 Min. Typ. 10 0.1 10 40 20 70 Max. Unit nV ----------Hz % mVRMS kHz G Zin RLOAD CLOAD ICC ISTBY -1.5 41 100 0 42.5 120 dB k k pF mA A PSRR -70 -46 dB Table 6. Symbol Vout Rout Iout PSRR Bias output: VCC = 3V, GND = 0V, Tamb = 25C (unless otherwise specified) Parameter No load condition Output resistance Output bias current Power supply rejection ratio, F=217Hz, Vripple=200mVpp 70 Min. 1.9 80 Typ. 2 100 2 80 Max. 2.1 120 Unit V W mA dB 6/24 TS472 Table 7. Gain (dB) 0 20 40 Electrical characteristics Differential RMS noise voltage Input referred noise voltage (VRMS) Unweighted filter 15 3.4 1.4 A-weighted filter 10 2.3 0.9 Output noise voltage (VRMS) Unweighted filter 15 34 141 A-weighted filter 10 23 91 Table 8. Bias output RMS noise voltage Cout (F) 1 10 Unweighted filter (VRMS) 5 2.2 A-weighted filter (VRMS) 4.4 1.2 Table 9. Gain (dB) SNR (signal to noise ratio), THD+N < 0.5% Unweighted filter (dB) VCC=2.2V VCC=3V 76 83 72 VCC=5.5V 76 83 74 VCC=2.2V 79 89 80 A-weighted filter (dB) VCC=3V 80 90 82 VCC=5.5V 80 90 84 0 20 40 75 82 70 Note: Unweighted filter = 20Hz F 20kHz 7/24 Electrical characteristics Table 10. Index of graphics Description Current consumption vs. power supply voltage Current consumption vs. standby voltage Standby threshold voltage vs. power supply voltage Frequency response Bias output voltage vs. bias output current Bias output voltage vs. power supply voltage Bias PSRR vs. frequency Differential output PSRR vs. frequency Single-ended output PSRR vs. frequency Equivalent input noise voltage density Figure TS472 Figure 2 and Figure 3 Figure 4 and Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 and Figure 11 Figure 12 to Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 to Figure 27 Figure 28 to Figure 29 Figure 30 to Figure 31 gain vs. power supply voltage Dgain vs. ambient temperature Maximum input voltage vs. gain, THD+N<1% Maximum input voltage vs. power supply voltage, THD+N<1% THD+N vs. input voltage THD+N vs. frequency Transient response 8/24 TS472 Electrical characteristics Figure 2. Current consumption vs. power supply voltage Figure 3. Current consumption vs. power supply voltage 3.0 2.5 2.0 1.5 1.0 0.5 0.0 No Loads GS floating Tamb=85C 3.0 2.5 Tamb=85C Current Consumption (mA) Current Consumption (mA) 2.0 1.5 1.0 0.5 0.0 No Loads GS grounded Tamb=25C Tamb=25C Tamb=-40C Tamb=-40C 0 1 2 3 4 Power Supply Voltage (V) 5 6 0 1 2 3 4 Power Supply Voltage (V) 5 6 Figure 4. Current consumption vs. standby voltage Figure 5. Current consumption vs. standby voltage 2.5 2.5 1.5 Vcc=3V 1.0 Vcc=5V Current Consumption (mA) Current Consumption (mA) 2.0 2.0 1.5 Vcc=3V Vcc=5V 1.0 0.5 No Loads GS floating Tamb = 25C 0.5 No Loads GS grounded Tamb = 25C 0.0 0 1 2 3 Standby Voltage (V) 4 5 0.0 0 1 2 3 Standby Voltage (V) 4 5 Figure 6. Standby threshold voltage vs. power supply voltage Figure 7. Frequency response 1.0 Standby Treshold Voltage (V) 30 Cb=1F, T AMB =25C, Gain=20dB, Rout=100k 20 0.8 PSRR (dB) 0.6 10 no C1,C2 C1,C2=100pF Cin,Cout=100nF 0.4 0 0.2 No Loads Tamb = 25C 2.2 3 4 Power Supply Voltage (V) 5 5.5 -10 C1,C2=220pF Cin,Cout=10nF 0.0 -20 10 100 1000 Frequency (Hz) 10000 100000 9/24 Electrical characteristics TS472 Figure 8. Bias output voltage vs. bias output Figure 9. current 2.2 Bias output voltage vs. power supply voltage 2.2 Vcc=2.5-6V Bias Output Voltage (V) Tamb=25C Ibias=0mA Bias Output Voltage (V) 2.0 Tamb=85C 2.0 Ibias=2mA 1.8 Ibias=4mA 1.6 1.8 1.6 Tamb=-40C Tamb=25C 1.4 1.4 0 1 2 3 Bias Output Current (mA) 4 2.2 3 4 Power Supply Voltage (V) 5 5.5 Figure 10. Bias PSRR vs. frequency 0 Vripple=200mVpp Vcc=3V Cb=1F Tamb =25C Figure 11. Bias PSRR vs. frequency 0 Vripple=200mVpp Vcc=5V Cb=1F Tamb=25C Bias = 1k to GND -20 PSRR (dB) -20 PSRR (dB) -40 Bias floating or 1k to GND -40 -60 -60 -80 -80 Bias floating -100 -100 50 100 1000 Frequency (Hz) 10000 20k 50 100 1000 Frequency (Hz) 10000 20k Figure 12. Differential output PSRR vs. frequency 0 -10 -20 PSRR (dB) Figure 13. Differential output PSRR vs. frequency 0 Vripple=200mVpp Inputs grounded Vcc=5V Cb=1F Cin=100nF Tamb=25C GS grounded GS=bias GS floating -30 -40 PSRR (dB) Vripple=200mVpp Inputs grounded Vcc=3V Cb=1F Cin=100nF Tamb=25C GS grounded GS=bias GS floating -10 -20 -30 -40 -50 -60 -70 -50 -60 -70 -80 50 100 1000 Frequency (Hz) 10000 20k -80 50 100 1000 Frequency (Hz) 10000 20k 10/24 TS472 Electrical characteristics Figure 14. Differential output PSRR vs. frequency 0 V RIPPLE=200mV PP , Inputs grounded -20 V CC =3V, Minimum Gain, Cin=1F, T AMB =25C Figure 15. Differential output PSRR vs. frequency 0 V RIPPLE =200mV PP, Inputs grounded -20 V CC =3V, Gain=20dB, Cin=1F, T AMB =25C PSRR (dB) -40 No Cb -60 Cb=100nF PSRR (dB) Cb=1F -40 Cb=1F No Cb -60 -80 -80 Cb=100nF -100 50 100 1k Frequency (Hz) 10k 20k -100 50 100 1k Frequency (Hz) 10k 20k Figure 16. Single-ended output PSRR vs. frequency 0 -10 -20 PSRR (dB) Figure 17. Equivalent input noise voltage density 1000 -30 -40 -50 -60 -70 -80 50 en (nV/Hz) Vripple=200mVpp Inputs grounded Cb=1F Cin=100nF Tamb=25C Cin=100nF R EQ=100 Vcc=3V 100 T AMB =25C 10 Vcc=2.2V 100 1000 Frequency (Hz) Vcc=5V 10000 20k 1 10 100 1k Frequency (Hz) 10k 100k Figure 18. gain vs. power supply voltage 1.0 0.8 0.6 0.4 0.2 0.0 -0.2 -0.4 2.2 F=1kHz Vin=5mV Tamb=25C Figure 19. gain vs. ambient temperature 0.50 0.25 0.00 Gain (dB) Maximum Gain F=1kHz V IN =5mV Gain (dB) -0.25 Maximum Gain -0.50 Gain=20dB Minimum Gain -20 0 20 40 Ambient Temperature (C) 60 80 Minimum Gain Gain=20dB 3 4 Power Supply Voltage (V) 5 5.5 -0.75 -1.00 -40 11/24 Electrical characteristics TS472 Figure 20. Maximum input voltage vs. gain, THD+N<1% 150 Maximum Input Voltage (mVRMS) Figure 21. Maximum input voltage vs. power supply voltage, THD+N<1% 140 Maximum Input Voltage (mVRMS) V CC =5.5V T AMB =25C F=1kHz THD+N<1% T AMB =25C, F=1kHz, THD+N<1% Gain=0dB 120 100 80 60 40 20 0 3 4 Power Supply Voltage (V) 5 5.5 Gain=40dB Gain=30dB Gain=20dB 100 50 V CC =3V V CC =2.2V 0 0 10 20 Gain (dB) 30 40 2.2 Figure 22. THD+N vs. input voltage 10 GS floating GS=bias 1 THD+N (%) Figure 23. THD+N vs. input voltage 10 GS floating GS=bias 1 THD+N (%) 0.1 GS grounded 0.01 1E-3 Tamb=25C, Vcc=3V, F=100Hz, Cb=1F, RL=10k , BW=100Hz-120kHz 0.01 Input Voltage (V) 0.1 GS grounded 0.01 Tamb=25C, Vcc=5V, F=100Hz, Cb=1F, RL=10k , BW=100Hz-120kHz 0.01 Input Voltage (V) 0.1 0.3 1E-3 0.1 0.3 Figure 24. THD+N vs. input voltage 10 GS floating GS=bias 1 THD+N (%) Figure 25. THD+N vs. input voltage 10 GS floating GS=bias 1 THD+N (%) 0.1 GS grounded 0.01 Tamb=25C, Vcc=3V, F=1kHz, Cb=1F, RL=10k , BW=100Hz-120kHz 0.01 Input Voltage (V) 0.1 GS grounded 0.01 Tamb=25C, Vcc=5V, F=1kHz, Cb=1F, RL=10k , BW=100Hz-120kHz 0.01 Input Voltage (V) 1E-3 0.1 0.3 1E-3 0.1 0.3 12/24 TS472 Electrical characteristics Figure 26. THD+N vs. input voltage 10 GS floating GS=bias 1 THD+N (%) Figure 27. THD+N vs. input voltage 10 GS floating GS grounded 1 THD+N (%) GS=bias 0.1 GS grounded 0.01 Tamb=25C, Vcc=3V, F=20kHz, Cb=1F, RL=10k , BW=100Hz-120kHz 0.01 Input Voltage (V) 0.1 0.01 0.1 0.3 Tamb=25C, Vcc=5V, F=20kHz, Cb=1F, RL=10k , BW=100Hz-120kHz 0.01 Input Voltage (V) 1E-3 1E-3 0.1 0.3 Figure 28. THD+N vs. frequency 10 Tamb=25C Vcc=3V RL=10k Cb=1F BW=100Hz-120kHz GS=bias, Vin=100mV Figure 29. THD+N vs. frequency 10 Tamb=25C Vcc=5V RL=10k Cb=1F BW=100Hz-120kHz 1 THD + N (%) 1 GS grounded, Vin=20mV THD + N (%) GS=bias, Vin=100mV GS grounded, Vin=20mV GS floating, Vin=100mV GS floating, Vin=100mV 10000 20k 0.1 50 100 1000 Frequency (Hz) 10000 20k 0.1 50 100 1000 Frequency (Hz) Figure 30. Transient response Figure 31. Transient response 13/24 Application information TS472 5 5.1 Application information Differential configuration principle The TS472 is a full-differential input/output microphone preamplifier. The TS472 also includes a common mode feedback loop that controls the output bias value to average it at VCC/2. This allows the device to always have a maximum output voltage swing, and by consequence, maximize the input dynamic voltage range. The advantages of a full-differential amplifier are: Very high PSRR (power supply rejection ratio). High common mode noise rejection. In theory, the filtering of the internal bias by an external bypass capacitor is not necessary. But, to reach maximum performance in all tolerance situations, it is better to keep this option. 5.2 Higher cut-off frequency The higher cut-off frequency FCH of the microphone preamplifier depends on the external capacitors C1, C2. TS472 has an internal first order low pass filter (R=40k C=100pF) to limit the highest cut, off frequency on 40kHz (with a 3dB attenuation). By connecting C1, C2 you can decrease FCH by applying the following formula: 1 F CH = --------------------------------------------------------------------------------------------3 - 12 2 40 x 10 ( C 1, 2 + 100 x 10 ) Figure 32 below indicates directly the higher cut-off frequency in Hz versus the value of the output capacitors C1, C2 in nF. Figure 32. Higher cut-off frequency vs. output capacitors 40 Higher Cut-off Frequency (kHz) 10 1 200 400 600 C1, C2 (pF) 800 1000 For example, FCH is almost 20kHz with C1,2=100pF. 14/24 TS472 Application information 5.3 Lower cut-off frequency The lower cut-off frequency FCL of the microphone preamplifier depends on the input capacitors Cin and output capacitors Cout. These input and output capacitors are mandatory in an application because of DC voltage blocking. The input capacitors Cin in series with the input impedance of the TS472 (100k) are equivalent to a first order high pass filter. Assuming that FCL is the lowest frequency to be amplified (with a 3dB attenuation), the minimum value of Cin is: 1 C in = -----------------------------------------------------3 2 F CL 100 x 10 The capacitors Cout in series with the output resistors Rout (or an input impedance of the next stage) are also equivalent to a first order high pass filter. Assuming that FCL is the lowest frequency to be amplified (with a 3dB attenuation), the minimum value of Cout is: 1 C out = -----------------------------------------2 F CL R out Figure 33. Lower cut-off frequency vs. input capacitors 1000 ZinMAX Typical Zin Figure 34. Lower cut-off frequency vs. output capacitors 1000 Rout=10k Lower Cut-off frequency (Hz) Lower Cut-off frequency (Hz) 100 100 ZinMIN Rout=100k 10 1 10 Cin (nF) 100 10 1 10 Cout (nF) 100 1000 Figure 33 and Figure 34 give directly the lower cut-off frequency (with 3dB attenuation) versus the value of the input or output capacitors Note: In case FCL is kept the same for calculation, take into account that the 1st order high-pass filter on the input and the 1st order high-pass filter on the output create a 2nd order highpass filter in the audio signal path with an attenuation of 6dB on FCL and a rolloff of 40dB decade. 5.4 Low-noise microphone bias source The TS472 provides a very low noise voltage and power supply rejection BIAS source designed for biasing an electret condenser microphone cartridge. The BIAS output is typically set at 2.0 VDC (no load conditions), and can typically source 2mA with respect to drop-out, determined by the internal resistance 100 (for detailed load regulation curves see Figure 8). 15/24 Application information TS472 5.5 Gain settings The gain in the application depends mainly on: the sensitivity of the microphone the distance to the microphone the audio level of the sound the desired output level The sensitivity of the microphone is generally expressed in dB/Pa, referenced to 1V/Pa. For example, the microphone used in testing had an output voltage of 6.3mV for a sound pressure of 1 Pa (where Pa is the pressure unit, Pascal). Expressed in dB, the sensitivity is: 20Log(0.0063) = -44 dB/Pa To facilitate the first approach, Table 11 below gives voltages and gains used with a low cost omnidirectional electret condenser microphone of -44dB/Pa. Table 11. Typical TS472 gain vs. distance to the microphone (sensitivity -44dB/Pa) Microphone output voltage 30mVRMS 3mVRMS TS472 Gain 20 100 Distance to microphone 1cm 20cm The gain of the TS472 microphone preamplifier can be set: 1. From -1.5 dB to 41 dB by connecting an external grounded resistor RGS to the GS pin. It allows to adapt more precisely the gain to each application. Selected gain vs. gain select resistor 0 470k 10 27k 20 4k7 30 1k 40 68 Table 12. Gain (dB) RGS () Figure 35. Gain in dB vs. gain select resistor 50 Tamb=25C 40 30 Gain (dB) Figure 36. Gain in V/V vs. gain select resistor Tamb=25C 100 Gain (V/V) 20 10 0 -10 10 10 1 10 100 1k 10k R GS () 100k 1M 100 1k 10k R GS () 100k 1M 2. To 20dB by applying VGS > 1VDC on Gain Select (GS) pin. This setting can help to reduce a number of external components in an application, because 2.0 VDC is provided by TS472 itself on BIAS pin. 16/24 TS472 Application information Figure 37 below gives other values of the gain vs. voltage applied on GS pin. Figure 37. Gain vs. gain select voltage 40 20 0 -20 -40 -60 -80 Tamb=25C Gain (dB) 0 0.2 0.4 0.6 0.8 V GS (V) 4 5 5.6 Wake-up time When the standby is released to put the device ON, a signal appears on the output a few microseconds later, and the bypass capacitor Cb is charged in a few milliseconds. As Cb is directly linked to the bias of the amplifier, the bias will not work properly until the Cb voltage is correct. In the typical application, when a biased microphone is connected to the differential input via the input capacitors (Cin), (and the output signal is in line with the specification), the wake-up time will depend upon the values of the input capacitors Cin and the gain. When gain is lower than 0dB, the wake-up time is determined only by the bypass capacitor Cb, as described above. For a gain superior to 0dB, see Figure 38 below. Figure 38. Wake-up time in the typical application vs. input capacitors 60 50 Wake-up Time (ms) Tamb = 25C Vcc=3V Cb=1F Maximum Gain 40 30 20 10 0 Gain=20dB 20 40 60 Input capacitors C IN (nF) 80 100 17/24 Application information TS472 5.7 Standby mode When the standby command is set, the time required to set the output stages (differential outputs and 2.0V bias output) in high impedance and the internal circuitry in shutdown mode is a few microseconds. 5.8 Layout considerations The TS472 has sensitive pins to connect C1, C2 and Rgs. To obtain high power supply rejection and low noise performance, it is mandatory that the layout track to these component is as short as possible. Decoupling capacitors on VCC and bypass pin are needed to eliminate power supply drops. In addition, the capacitor location for the dedicated pin should be as close to the device as possible. 5.9 Single-ended input configuration It's possible to use the TS472 in a single-ended input configuration. The schematic in Figure 39 provides an example of this configuration. Figure 39. Single ended input typical application Optional C1 VCC Cs 1uF C2 D3 A3 C3 1uF Rpos U1 B3 TS472 Rout+ C1 C2 Vcc Cin+ Cout+ A1 B1 IN+ IN- OUT+ OUTGAIN SELECT C2 D2 CoutRout- + Electret Mic Cin- Positive Output Negative Output G A2 B2 BIAS 2.0V GND Bias STDBY BYPASS D1 Cb 1uF C1 C3 Standby Control 18/24 TS472 Application information 5.10 Demo board A demo board for the TS472 is available. For more information about this demo board, please refer to Application Note AN2240, which can be found on www.st.com. Figure 40. PCB top layer Figure 41. PCB bottom layer Figure 42. Component location 19/24 Package mechanical data TS472 6 Package mechanical data In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK(R) 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. 6.1 Flip-chip package Figure 43. TS472 footprint recommendation 500m =250m 500m 75m min. 100m max. Track 500m =400m typ. =340m min. 150m min. Non Solder mask opening Pad in Cu 18m with Flash NiAu (2-6m, 0.2m max.) Figure 44. Pin-out (top view) 500m 3 2 1 C1 C2 STDBY VCC OUTPUT BIAS GS OUT+ OUT- IN+ IN- GND BYPASS A B C D Balls are underneath 20/24 TS472 Figure 45. Marking (top view) Package mechanical data ST logo Part number: 472 E Lead free bumps Three digits datecode: YWW The dot indicates pin A1 472 YWW E Figure 46. Flip-chip - 12 bumps 2.1 mm 1.6 mm Die size: 2.1mm x 1.6mm 30m Die height (including bumps): 600m Bumps diameter: 315m 50m Bump diameter before reflow: 300m 10m Bump height: 250m 40m Die height: 350m 20m Pitch: 500m 50m Coplanarity: 50m max 0.5mm 0.5mm 0.315mm 600m Figure 47. Tape & reel specification (top view) 4 1.5 1 A A Die size Y + 70m 1 8 Die size X + 70m 4 All dimensions are in mm User direction of feed 21/24 Package mechanical data TS472 6.2 QFN24 package Figure 48. QFN24 package mechanical data 22/24 TS472 Revision history 7 Revision history Table 13. Date 1-Jul-05 1-Oct-05 1-Dec-05 12-Sep-2006 Document revision history Revision 1 2 3 4 Changes Initial release corresponding to product preview version. First release of fully mature product datasheet. Added single-ended input operation in Section 5: Application information. Added QFN package information. Updated curves, added new ones in Section 4: Electrical characteristics. 23/24 TS472 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. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2006 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 24/24 |
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