Features * * * * * * * * Wide Operating Voltage Range: 2V to 16V Low Current Consumption: 2.7 mA Typically Chip Disable Input to Power Down the Integrated Circuit Low Power-down Quiescent Current Drives a Wide Range of Speaker Loads Output Power Po = 250 mW at RL = 32 (Speaker) Low Harmonic Distortion (0.5% Typically) Wide Gain Range: 0 dB to 46 dB Low-power Audio Amplifier for Telephone Applications Benefits * Low Number of External Components * Low Current Consumption 1. Description The integrated circuit U4083B is a low-power audio amplifier for telephone loudspeakers. It has differential speaker outputs to maximize the output swing at low supply voltages. There is no need for coupler capacitors. The U4083B has an open-loop gain of 80 dB where the closed-loop gain is adjusted with two external resistors. A chip disable pin permits powering down and/or muting the input signal. Figure 1-1. Block Diagram 6 Vi FC3 VS 4 5 Amp1 3 4k 2 8 Amp2 125k VO1 4k 50k FC2 U4083B VO2 50k U4083B Bias circuit 1 CD 7 GND Rev. 4655C-CORD-03/06 2. Pin Configuration Figure 2-1. Table 2-1. Pin 2 Pinning SO8 CD 1 8 VO2 FC2 2 7 GND FC1 3 6 VS Vi 4 5 VO1 Pin Description Symbol Function 1 CD Chip disable 2 FC2 Filtering, power supply rejection 3 FC1 Filtering, power supply rejection 4 Vi 5 VO1 6 VS 7 GND Ground 8 VO2 Amplifier output 2 Amplifier input Amplifier output 1 Voltage supply U4083B 4655C-CORD-03/06 U4083B 3. Functional Description Including External Circuitry 3.1 Pin 1: Chip Disable Digital Input (CD) Pin 1 (chip disable) is used to power down the IC to conserve power or mute the IC or both. Input impedance at Pin 1 is typically 90 k. * Logic 0 < 0.8V IC enabled (normal operation) * Logic 1 > 2V IC disabled Figure 8-15 on page 12 shows the power supply current diagram. The change in differential gain from normal operation to muted operation (muting) is more than 70 dB. Switching characteristics are as follows: * Turn-on time ton = 12 ms to 15 ms * Turn-off time toff 2 s They are independent of C1, C2 and VS. Voltages at Pins 2 and 3 are supplied from VS and, therefore, do not change when the U4083B is disabled. The outputs, VO1 (Pin 5) and VO2 (Pin 8), turn to a high impedance condition by removing the signal from the speaker. When signals are applied from an external source to the outputs (disabled), they must not exceed the range between the supply voltage, VS, and ground. 3.2 Pins 2 and 3: Filtering, Power Supply Rejection Power supply rejection is provided by capacitors C1 and C2 at Pin 3 and Pin 2, respectively. C1 is dominant at high frequencies whereas C2 is dominant at low frequencies (Figure 8-4 on page 8 to Figure 8-7 on page 9). The values of C1 and C2 depend on the conditions of each application. For example, a line-powered speakerphone (telephone amplifier) will require more filtering than a system powered by regulated power supply. The amount of rejection is a function of the capacitors and the equivalent impedance at Pin 3 and Pin 2 (see electrical characteristic equivalent resistance, R). Apart from filtering, capacitors C1 and C2 also influence the turn-on time of the circuit at power up, since the capacitors are charged up through the internal resistors (50 k and 125 k) as shown in the block diagram. Figure 8-1 on page 7 shows the turn-on time versus C2 at VS = 6V, for two different C1 values. The turn-on time is 60% longer when VS = 3V and 20% shorter when VS = 9V. The turn-off time is less than 10 s. 3 4655C-CORD-03/06 3.3 Pin 4: Amplifier Input Vi, Pin 5: Amplifier Output 1 VO1, Pin 8: Amplifier Output 2 VO2 There are two identical operational amplifiers. Amplifier 1 has an open-loop gain 80 dB at 100Hz (Figure 8-2 on page 7), whereas the closed-loop gain is set by external resistors, Rf and Ri (Figure 8-3 on page 8). The amplifier is unity gain stable, and has a unity gain frequency of approximately 1.5 MHz. A closed-loop gain of 46 dB is recommended for a frequency range of 300Hz to 3400Hz (voice band). Amplifier 2 is internally set to a gain of -1.0 dB (0 dB). The outputs of both amplifiers are capable of sourcing and sinking a peak current of 200 mA. Output voltage swing is between 0.4V and VS - 1.3V at maximum current (Figure 8-18 on page 13 and Figure 8-19 on page 13). The output DC offset voltage between Pins 5 and 8 (VO1 - VO2) is mainly a function of the feedback resistor, Rf, because the input offset voltages of the two amplifiers neutralize each other. Bias current of Amplifier 1 which is constant with respect to V s , flows out of Pin 4 (Vi ) and through Rf, forcing VO1 to shift negative by an amount equal to RfIIB and VO2 positive to an equal amount. The output offset voltage specified in the electrical characteristics is measured with the feedback resistor (Rf = 75 k) shown in the typical application circuit, Figure 8-20 on page 14. It takes into account the bias current as well as internal offset voltages of the amplifiers. 3.4 Pin 6: Supply and Power Dissipation Power dissipation is shown in Figure 8-8 on page 9 to Figure 8-10 on page 10 for different loads. Distortion characteristics are given in Figure 8-11 on page 10 to Figure 8-13 on page 11. T jmax - T amb P totmax = -------------------------------R thJA where Tjmax = Junction temperature = 140C Tamb = Ambient temperature RthJA = Thermal resistance, junction-ambient Power dissipated within the IC in a given application is found from the following equation: Ptot = (VS x IS) + (IRMS x VS) - (RL x IRMS2) IS is obtained from Figure 8-15 on page 12. IRMS is the RMS current at the load RL. The IC's operating range is defined by a peak operating load current of 200 mA (Figure 8-8 on page 9 to Figure 8-13 on page 11). It is further specified with respect to different loads (see Figure 8-14 on page 12). The left (ascending) portion of each of the three curves is defined by the power level at which 10% distortion occurs. The center flat portion of each curve is defined by the maximum output current capability of the integrated circuit. The right (descending) portion of each curve is defined by the maximum internal power dissipation of the IC at 25C. At higher ambient temperatures, the maximum load power must be reduced according to the above mentioned equation. 4 U4083B 4655C-CORD-03/06 U4083B 3.5 Layout Considerations Normally, a snubber is not needed at the output of the IC, unlike many other audio amplifiers. However, the PC-board layout, stray capacitances, and the manner in which the speaker wires are configured may dictate otherwise. Generally, the speaker wires should be twisted tightly, and should not be more than a few cm (or inches) in length. 4. Absolute Maximum Ratings Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Reference point pin 7, Tamb = 25 C unless otherwise specified. Parameters Symbol Value Unit VS -1.0 to +18 V -1.0 to (VS + 1.0) -1.0 to (VS + 1.0) V V 250 mA Tj +140 C Storage temperature range Tstg -55 to +150 C Ambient temperature range Tamb -20 to +70 C Power dissipation SO8: Tamb = 60C Ptot 440 mW Symbol Value Unit RthJA 180 K/W Symbol Value Unit Supply voltage Pin 6 Voltages Disabled Pins 1, 2, 3 and 4 Pins 5 and 8 Output current Pins 5 and 8 Junction temperature 5. Thermal Resistance Parameters Junction ambient SO8 6. Recommended Operating Conditions Parameters Supply voltage Pin 6 VS 2 to 16 V Load impedance Pins 5 to 8 RL 8.0 to 100 IL 200 mA Differential gain (5.0 kHz bandwidth) DG 0 to 46 dB Voltage at CD VCD VS V Tamb -20 to +70 C Load current Ambient temperature range Pin 1 5 4655C-CORD-03/06 7. Electrical Characteristics Tamb = +25C, reference point pin 7, unless otherwise specified Parameters Test Conditions Symbol Min. GVOL1 80 GV2 -0.35 Typ. Max. Unit Amplifiers (AC Characteristics) Open-loop gain (Amplifier 1, f < 100Hz) Closed-loop gain (Amplifier 2) VS = 6.0V, f = 1.0 kHz, RL = 32 Gain bandwidth product Output power Total harmonic distortion (f = 1.0 kHz) VS = 6.0V, RL = 32, Po = 125 mW VS > 3.0V, RL = 8, Po = 20 mW VS > 12V, RL = 32, Po = 200 mW Power supply rejection ratio VS = 6.0V, VS = 3.0V C1 = , C2 = 0.01 F C1 = 0.1 F, C2 = 0, f = 1.0 kHz C1 = 1.0 F, C2 = 5.0 F, f = 1.0 kHz VS = 6.0V, 1.0 kHz < f < 20 kHz, CD = 2.0V Muting PO PO PO 0 +0.35 1.5 GBW VS = 3.0V, RL = 16, d < 10% VS = 6.0V, RL = 32, d < 10% VS = 12V, RL = 100, d < 10% dB dB MHz 55 250 400 mW d 0.5 d 0.5 d 0.6 PSRR PSRR 12 1.0 % dB 50 PSRR 52 GMUTE >70 dB Amplifiers (DC Characteristics) 1.15 2.65 5.65 Output DC level at VO1, VO2 Rf = 75 kW VS = 3.0V, RL = 16 VS = 6.0V VS = 12V VO VO VO Output high level IO = -75 mA, 2.0V < VS < 16V VOH VS - 1 V Output low level IO = -75 mA, 2.0V < VS < 16V VOL 0.16 V Output DC offset voltage (VO1 - VO2) VS = 6.0V, Rf = 75 k, RL = 32 VO Input bias current at Vi VS = 6.0V -IIB Equivalent resistance at Pin 3 VS = 6.0V R Equivalent resistance at Pin 2 VS = 6.0V Chip disable Pin 1 Input voltage low Input voltage high Input resistance Power supply current 6 VS = VCD = 16V VS = 3.0V, RL = , CD = 0.8V VS = 16V, RL = , CD = 0.8V VS = 3.0V, RL = , CD = 2.0V 1.0 V 0 +30 mV 100 200 nA 100 150 220 k R 18 25 40 k VIL VIH RCD 0.8 2.0 50 IS IS IS -30 1.25 90 175 V V k 65 4.0 5.0 100 mA mA A U4083B 4655C-CORD-03/06 U4083B 8. Typical Temperature Performance Tamb = -20 to +70 C Function Typical Change Units 40 pA/ C Total harmonic distortion VS = 6.0V, RL = 32 , Po = 125 mW, f = 1.0 kHz +0.003 %/ C Power supply current VS = 3.0V, RL = , CD = 0V VS = 3.0V, RL = , CD = 2.0V -2.5 -0.03 A/ C A/ C Input bias current at Vi Figure 8-1. Turn-on Time versus C1 and C2 at Power On 360 300 C1 = 5 F ton (ms) 240 180 120 1 F 60 VS switching from 0 to +6V 0 0 2 4 6 8 10 C2 (F) Amplifier 1 -- Open-loop Gain and Phase 100 99.33 G (dB) 80 Phase 92.67 86.00 60 40 79.33 Phase (Degrees) Figure 8-2. Gain 20 72.67 0 0.1 1 10 100 66.00 1000 f (kHz) 7 4655C-CORD-03/06 Figure 8-3. Differential Gain versus Frequency 40 Rf = 150 k Differential gain (dB) Ri = 6 k 32 Rf = 75 k Ri = 3 k 24 Rf Ci Input Ri VO1 16 0.1 F Amp 1 8 Outputs VO2 Amp 2 0 0 1 10 100 Frequency (kHz) Figure 8-4. Power Supply Rejection versus Frequency -- C2 = 10 F 60 60 C C11 > > 11 F F PSSR(dB) (dB) PSSR 50 50 C C11 = = 0.1 0.1 F F 40 40 C2C= = 10F F 2 30 30 C C11 = = 00 20 20 10 10 0.1 0.1 11 10 10 100 100 ff (kHz) (kHz) Figure 8-5. Power Supply Rejection versus Frequency -- C2 = 5 F 60 C1 > 1 F PSRR (dB) 50 CC 1 = 0.1 F 40 C2 = 5 F 30 20 C1= 0 10 0.1 1 10 100 f (kHz) 8 U4083B 4655C-CORD-03/06 U4083B Figure 8-6. Power Supply Rejection versus Frequency -- C2 = 1 F 60 C1 > 5 F 50 PSSR (dB) C1 = 1 F 40 C2 = 1 F C1 = 0.1 F 30 20 C1 = 0 10 0.1 1 100 10 f (kHz) Figure 8-7. Power Supply Rejection versus Frequency -- C2 = 0 55 C1 > 5 F PSSR (dB) 45 35 C1 = 1 F C2 = 0 25 C1 = 0.1 F 15 5 0.1 1 100 10 f (kHz) Figure 8-8. Device Dissipation -- RL = 8 1200 VS = 12 V 1000 RL= 8 Ohm Ptot (mW) 800 6V 600 400 3V 200 0 0 30 60 90 120 150 180 PL (mW) 9 4655C-CORD-03/06 Figure 8-9. Device Dissipation -- RL = 16 1200 VS = 16 V 12 V 1000 RL = 16 Ohm Ptot (mW) 800 600 6V 400 200 3V 0 0 100 200 400 300 PL (mW) Figure 8-10. Device Dissipation -- RL = 32 1200 VS = 16 V 12 V 1000 Ptot (mW) 800 RL = 32 Ohm 600 400 6V 200 3V 0 0 100 200 300 400 500 600 PL (mW) Figure 8-11. Distortion versus Power -- f = 1 kHz, Delta - GV = 34 dB 10 8 VS = 3 V VS = 3V Delta-GV= 34 dB RL = 8 Ohm d(%) 6 f = 1 kHz VS = 6 V RL = 16 Ohm RL = 32 Ohm 4 VS = 16V 2 RL = 32 Ohm VS = 6 V VS = 12 V RL = 16 W RL = 32 Ohm 0 0 100 200 300 400 PO (mW) 10 U4083B 4655C-CORD-03/06 U4083B Figure 8-12. Distortion versus Power -- f = 3 kHz, Delta - GV = 34 dB 10 8 VS = 3 V RL = 16 Ohm VS = 3 V RL = 8 Ohm f = 3 kHz Delta-GV = 34 dB VS= 6 V RL = 32 Ohm d(%) 6 4 VS = 6 V RL = 16 Ohm VS = 16 V RL = 32 Ohm Limit 2 VS = 12 V RL = 32 Ohm 0 0 100 200 300 400 PO (mW) Figure 8-13. Distortion versus Power -- f = 1 kHz or 3 kHz, Delta - GV = 12 dB 10 8 VS = 3 V VS = 6 V RL = 16 Ohm VS = 3 V f = 1 or 3 kHz Delta-GV = 12 dB RL = 8 Ohm d(%) 6 RL = 32 W 4 2 VS = 16 V VS = 6 V RL = 16 Ohm Limit VS = 12 V RL = 32 Ohm RL = 32 Ohm Limit 0 0 100 200 300 400 PO = ( mW ) 11 4655C-CORD-03/06 Figure 8-14. Maximum Allowable Load Power 600 Tamb = 25C - Derate at higher temperature 500 RL = 32 PL (W) 400 300 16 Ohm 200 8 Ohm 100 0 0 4 8 12 16 20 VS (V) Figure 8-15. Power-supply Current 5 RL = 4 IS (mA) CD = 0 3 2 1 CD = V S 0 0 4 8 12 16 20 VS (V) Input 1mV/Div Output 20mV/Div Figure 8-16. Small Signal Response 20 s/Div 12 U4083B 4655C-CORD-03/06 U4083B Input 80mV/Div Output 1V/Div Figure 8-17. Large Signal Response 20s/Div Figure 8-18. VS - VOH versus Load Current 1.3 VS-VOH(V ) 1.2 1.1 1.0 2V< VS <16 V 0.9 0.8 0 40 80 120 200 160 IL (mA) Figure 8-19. VOL versus Load Current 2.0 VOL (V) 1.6 1.2 VS = 2 V 0.8 VS= 3 V 0.4 VS>6 V 0 0 40 80 120 160 200 IL(mA) 13 4655C-CORD-03/06 Figure 8-20. Application Circuit R1B 75k Ci Rf 6 Ri Vi 3k C1 1F VO1 4k 4k 50k 2 8 Amp2 125k C1B 5 Amp1 3 FC3 C2 100nF VS 4 0.1F 10R VO2 FC2 5F 50k C2B 100nF U4083B 1 Bias circuit CD R2B 10R 7 GND 14 U4083B 4655C-CORD-03/06 U4083B 9. Ordering Information Extended Type Number Package Remarks U4083B-MFPY SO8, Pb-free Tube U4083B-MFPG3Y SO8, Pb-free Taped and reeled 10. Package Information Package SO8 Dimensions in mm 5.2 4.8 5.00 4.85 3.7 1.4 0.25 0.10 0.4 1.27 6.15 5.85 3.81 8 0.2 3.8 5 technical drawings according to DIN specifications 1 4 15 4655C-CORD-03/06 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards 1150 East Cheyenne Mtn. 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