AS1701

AS1701, AS1706 1.6W Audio Power Amplifiers D a ta S he e t 1 General Description The AS1701 and AS1706 are 1.6W bridged audio power amplifiers that provide excellent circuit reliability, providing a very low-cost solution by eliminating external components when used with 2.7 to 5.5V-powered circuits. The devices have superb total harmonic distortion (THD) at high-power output and excellent power supply rejection with 4- and 8Ω-loads. Integrated over-temperature and over-current protection circuitry switch the devices off in case of an output short-circuit. A digital input allows the devices to automatically switch into shutdown mode. Click- and popsuppression circuitry reduces audible clicks and pops during power-up and shutdown. The gain (AV) of the devices is controlled using external resistors. The AS1701/AS1706 are available in an 8-pin MSOP package. 2 Key Features ! ! ! ! ! ! ! ! ! ! 2.7 to 5.5V (VDD) Single-Supply Operation Very High PSRR: Greater Than 65dB @ 217Hz THD+Noise: 1.6W into 4Ω at 1% No Output Coupling Capacitors Required External Gain Configuration Capability Low-Power Shutdown Mode: 10nA Click and Pop Suppression Over-Temperature and Over-Current Protection Operating Temperature Range: -40 to +85°C 8-pin MSOP Package 3 Applications The AS1701/AS1706 are ideal as audio front-ends for battery powered audio devices such as MP3 and CD players, mobile phones, PDAs, portable DVD players, and any other hand-held battery-powered device. Figure 1. Typical Configuration Block Diagram VDD + 10µF 20kΩ RF CS 6 VDD Audio Input CIN 0.33µF RIN 20kΩ 4 IN3 IN+ – + 50kΩ – 40kΩ 5 OUT+ 40kΩ RL = 4 or 8Ω 8 OUT- 2 0.1 to + 1µF CB BIAS VDD/2 + Av = -1 1 SHDN Bias 50kΩ AS1701/ AS1706 7 GND www.austriamicrosystems.com Revision 1.52 1 - 17 AS1701, AS1706 Data Sheet - P i n o u t 4 Pinout Pin Assignments Figure 2. Pin Assignment – 8-Pin MSOP Package (Top View) SHDN 1 8 OUT- BIAS 2 AS1701/ AS1706 7 GND IN+ 3 6 VDD IN- 4 5 OUT+ Pin Descriptions Table 1. Pin Descriptions Pin 1 2 3 4 5 6 7 8 Name SHDN BIAS IN+ INOUT+ VDD GND OUTDescription Shutdown. Connect this pin to GND for the AS1701 (active-high); connect this pin to VDD for the AS1706 (active-low). DC Bias Bypass Non-Inverting Input Inverting Input Positive Differential Output Power Supply Ground Negative Differential Output www.austriamicrosystems.com Revision 1.52 2 - 17 AS1701, AS1706 Data Sheet - A b s o l u t e Maximum Ratings 5 Absolute Maximum Ratings Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in Electrical Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2. Absolute Maximum Ratings Parameter VDD to GND Any Other Pin to GND Input Current (Latchup Immunity) Continuous Power Dissipation Electro-Static Discharge (ESD) Operating Temperature Range (TAMB) Storage Temperature Range -40 -65 Min -0.3 -0.3 -100 Max +7 VDD + 0.3 100 362 1 +85 +150 Unit V V mA mW kV ºC ºC The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD020C “Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices”. JEDEC 78 TAMB = 70ºC, Derate 4.5mW/ºC Above +70ºC HBM MIL-Std883E 3015.7 Methods Comments Soldering Conditions +260 ºC www.austriamicrosystems.com Revision 1.52 3 - 17 AS1701, AS1706 Data Sheet - E l e c t r i c a l Characteristics 6 Electrical Characteristics All specifications are 100% tested at TAMB = +25ºC. VDD = 5V, RL = ∞, CBIAS = 0.1µF to GND, SHDN = GND, TAMB +25ºC (unless otherwise specified). Table 3. DC Electrical Characteristics – 5V Operation Parameter Supply Voltage Range Supply Current Shutdown Supply Current SHDN Threshold 1 5V Operation Symbol VDD IDD ISHDN Conditions Inferred from PSRR Test TAMB = -40 to +85ºC SHDN = VDD VIH VIL Min 2.7 Typ 6.8 0.01 Max 5.5 10.4 1 Units V mA µA V VDD x 0.7 Common-Mode Bias Voltage Output Offset Voltage 2 VBIAS VOS PSRR POUT THD+N Power Supply Rejection Ratio Output Power 3 VDD x 0.3 VDD/2 VDD/2 VDD/2 - 5% + 5% Av = 2, IN- = OUT+, IN- = BIAS ±1 ±10 Inputs Grounded, VRIPPLE = 217Hz 65 200mVp-p, RL = 4Ω, VIN- = VIN+ = 1kHz 63 VBIAS RL = 4Ω, THD+N = 1%, fIN = 1kHz RL = 8Ω, THD+N = 1%, fIN = 1kHz AV = 2, RL = 4Ω, fIN = 1kHz, POUT = 1.3W AV = 2, RL = 8Ω, fIN = 1kHz, POUT = 1W 0.8 1.6 1.2 0.09 0.05 145 9 150 1 20 V mV dB W % ºC ºC ms µs mV Total Harmonic Distortion+Noise Thermal-Shutdown Threshold Thermal-Shutdown Hysteresis Power-Up/Enable from Shutdown Time Shutdown Time Turn-Off Transient tPU tSHDN VPOP 1. Quiescent power supply current is specified and tested without loads on the outputs. Quiescent power supply current depends on the offset voltage when a practical load is connected to the device. 2. Common-mode bias voltage is the voltage on pin BIAS and is nominally VDD/2. 3. Guaranteed by design. 3V Operation VDD = 3V, RL = ∞, CBIAS = 0.1µF to GND, SHDN = GND, TAMB +25ºC (unless otherwise specified). Table 4. DC Electrical Characteristics – 3V Operation Parameter Supply Current Shutdown Supply Current 1 Symbol IDD ISHDN Conditions TAMB = -40 to +85ºC Min Typ 6 0.01 0.6 0.4 65 63 0.09 0.06 Max Units 10 1 mA µA W dB % SHDN = VDD RL = 4Ω, THD+N = 1%, fIN = 1kHz 2 POUT Output Power RL = 8Ω, THD+N = 1%, fIN = 1kHz 217Hz VRIPPLE = 200mVp-p, Power Supply Rejection Ratio PSRR RL = 8Ω, VIN- = VIN+ = VBIAS 1kHz AV = 2, RL = 4Ω, fIN = 1kHz, POUT = 500mW Total Harmonic Distortion +Noise THD+N AV = 2, RL = 8Ω, fIN = 1kHz, POUT = 350mW 1. Quiescent power supply current is specified and tested without loads on the outputs. Quiescent power supply current depends on the offset voltage when a practical load is connected to the device. 2. Guaranteed by design. www.austriamicrosystems.com Revision 1.52 4 - 17 AS1701, AS1706 Data Sheet - T y p i c a l Operating Characteristics 7 Typical Operating Characteristics Figure 3. THD + Noise vs. Output Power; VDD = 3V, RL = 4Ω, Av = 2 100 Figure 4. THD + Noise vs. Output Power; VDD = 3V, RL = 8Ω, Av = 2 100 10 fIN = 1kHz 10 fIN = 1kHz 1 fIN = 10kHz THD+N (%) THD+N (%) 1 fIN = 10kHz 0.1 fIN = 100Hz 0.1 0.01 0.01 fIN = 100Hz 0.001 0 100 200 300 400 500 600 700 800 0.001 0 100 200 300 400 500 600 Output Power (mW) Figure 5. THD + Noise vs. Output Power; VDD = 3V, RL = 4Ω, Av = 4 100 Output Power (mW) Figure 6. THD + Noise vs. Output Power; VDD = 3V, RL = 8Ω, Av = 4 100 10 fIN = 1kHz 10 fIN = 1kHz THD+N (%) THD+N (%) 1 fIN = 10kHz 1 fIN = 10kHz 0.1 fIN = 100Hz 0.1 fIN = 100Hz 0.01 0.01 0.001 0 100 200 300 400 500 600 700 800 0.001 0 100 200 300 400 500 600 Output Power (mW) Figure 7. THD + Noise vs. Output Power; VDD = 5V, RL = 4Ω, Av = 2 100 Output Power (mW) Figure 8. THD + Noise vs. Output Power; VDD = 5V, RL = 8Ω, Av = 2 100 10 fIN = 1kHz 10 fIN = 1kHz THD+N (%) THD+N (%) 1 fIN = 10kHz 1 fIN = 10kHz 0.1 fIN = 100Hz 0.1 0.01 0.01 fIN = 100Hz 0.001 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 0.001 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Output Power (W) Output Power (mW) www.austriamicrosystems.com Revision 1.52 5 - 17 AS1701, AS1706 Data Sheet - T y p i c a l Operating Characteristics Figure 9. THD + Noise vs. Output Power; VDD = 5V, RL = 4Ω, Av = 4 100 Figure 10. THD + Noise vs. Output Power; VDD = 5V, RL = 8Ω, Av = 4 100 10 fIN = 1kHz 10 fIN = 1kHz THD+N (%) 1 fIN = 10kHz THD+N (%) 1 fIN = 10kHz 0.1 fIN = 100Hz 0.1 fIN = 100Hz 0.01 0.01 0.001 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 0.001 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 Output Power (W) Figure 11. THD + Noise vs. Frequency; VDD = 3V, RL = 4Ω, Av = 2 10 Output Power (W) Figure 12. THD + Noise vs. Frequency; VDD = 3V, RL = 8Ω, Av = 2 10 THD+N (%) 0.1 250mW 500mW THD+N (%) 1 1 0.1 200mW 350mW 0.01 10 100 1000 10000 0.01 10 100 1000 10000 Frequency (Hz) Figure 13. THD + Noise vs. Frequency; VDD = 5V, RL = 4Ω, Av = 2 10 Frequency (Hz) Figure 14. THD + Noise vs. Frequency; VDD = 5V, RL = 8Ω, Av = 2 10 THD+N (%) 0.1 500mW 1.4W THD+N (%) 1 1 0.1 300mW 700mW 0.01 10 100 1000 10000 0.01 10 100 1000 10000 Frequency (Hz) Frequency (Hz) www.austriamicrosystems.com Revision 1.52 6 - 17 AS1701, AS1706 Data Sheet - T y p i c a l Operating Characteristics Figure 15. THD + Noise vs. Frequency; VDD = 5V, RL = 4Ω, Av = 4 10 Figure 16. THD + Noise vs. Frequency; VDD = 5V, RL = 8Ω, Av = 4 10 THD+N (%) 500mW 0.1 THD+N (%) 1 1 1.4W 0.1 500mW 1W 0.01 10 100 1000 10000 0.01 10 100 1000 10000 Frequency (Hz) Figure 17. Power Dissipation vs. POUT; VDD = 5V, Av = 2, RL = 4Ω, f = 1kHz, THD+N