ÓÉ Foxit PDF Editor ±à¼°æȨËùÓÐ (c) by Foxit Software Company, 2004 ½öÓÃÓÚÆÀ¹À¡£ Techcode® DATASHEET 4 Inputs Selectable Stereo Class-AB Audio Amplifier TD9772A 汪工 ＴＥＬ：１３８２８７１９４１０ ＱＱ：１９２９７９４２３８ General Description Features TD9772A is an audio amplifier of Class‐AB type. It offers both excellent sound quality of THD+N<0.03% , and input/output flexibilities. TD9772A features three different output configurations and four different input channels, both selectable by external pins. Outputs can be BTL,SE, or straight‐through. There are four input channels making it convenient for the multigadgets modern age. On‐chip DC volume control features 64 non‐linear digital steps from –84dB to 24dB for better responsive to human ears While output power can be as high as 2.6W, the maximum output voltage can be adjusted by an external bias so that output power can be limited. Output pin short protection and over temperature shutdown modes are to ensure good system integrity. Internal soft switching designs are to minimize click and pop noises during power up/down, mute, and channel switching instances. ◆ Vin: 2.5V to 5.5V ◆ Max Output Power (4‐ohm speaker): 2.6W ‐ With 64 Steps Volume Control ‐ Adjustable max Output Power Limits ◆ 4 selectable Inputs ◆ Supports 3 Output configurations: BTL, SE, and Straight through. ‐ Maximum BTL gain: 24dB ‐ Maximum SE gain: 18dB ◆ Quiescent Current: <10mA ◆ Under Voltage Lockout at Vin <2V ◆ Short Circuit Protection ◆ Over Temperature Protection ◆ No Click and Pop noise: <10mW for BTL Applications • • • Ordering Information Order Number Package Type TSSOP-24L Remark Portable Music Center Notebook PC LCD Monitors Techcode® DATASHEET 4 Inputs Selectable Stereo Class-AB Audio Amplifier TD9772A Typical Application Circuit Techcode® 4 Inputs Selectable Stereo Class-AB Audio Amplifier DATASHEET TD9772A Functional Block Diagram Techcode® DATASHEET TD9772A 4 Inputs Selectable Stereo Class-AB Audio Amplifier Pinout Configuration Ordering Information TD9772A □ □ Circuit Type Packing: Blank：Tube R:Type and Reel O:TSSOP-24 Techcode® DATASHEET 4 Inputs Selectable Stereo Class-AB Audio Amplifier TD9772A Pin Descriptions SSOP-24 Pin No. Pin Name 1，24 LOUT+，ROUT+ Positive audio output terminals 2，23 PVDD 3，22 LOUT-，ROUT- 4，21 LPGND，RPGND 5，6 LLin1，LLin2 7，8 LLin3，LLin4 17，18 RLin1，RLin2 19，20 RLin3，RLin4 9 AVDD 10，11 Line1/Line2 Line3/Line4 12 VOLUME Input voltage for setting volume gain (See Table 4 and graph) 13 VLM/MUTE Input voltage for setting the maximum output voltage swing (See Table 3) ◆ 0V to VMute, Output driver is at tri-stated (Mute). ◆ Vlml to Vlmh, Output voltage is limited, see table 3. ◆ >Vlmh, Output voltage is at AVDD. 14 BYPASS 15 AGND 16 BTL/STRAIGHT/SE Supply voltage terminal for output power stage Negative audio output terminals Ground terminal for output power stage Left channel line inputs Right channel line inputs Supply voltage terminal for internal circuits Input MUX control (see Table 1 for selection logic) Connecting to a bypass cap of typical value 2.2uF. Analog power supply ground 0: Logic input 0, VIL 1: Logic input 1, VIH N C: No Connect Description and Function Output mode selection (See Table 2 for selection logic) ◆ >VIL, output at BTL mode ◆ <VIH, output at SE mode ◆ Floating, output signal is the same as input signal Techcode® DATASHEET 4 Inputs Selectable Stereo Class-AB Audio Amplifier Table 1: Input Line Selection Pin Line3/Line4 Pin Line1/Line2 Selection 0 0 Line1 inputs 0 1 Line2 inputs 1 0 Line3 inputs 1 1 Line4 inputs Table 2: Output Mode Selection BTL / Straight Through / SE Output Mode 0 BTL output NC Straight Through t t SE out (I 1 / Table 3: Output Voltage Limit VLM / Mute VMute VLML < Vo < VLMH > VLMH Output Voltage 0(Mute State) AVDD/2-(VLM+0.6)<Vout<AVDD/2+(VLM+0.6) 0<Vout<AVDD TD9772A Techcode® 4 Inputs Selectable Stereo Class-AB Audio Amplifier Table 4: Volume Control (For BTL Ouptput configuration) Table 5: Volume Control (For SE Ouptput configuration) DATASHEET TD9772A Techcode® 4 Inputs Selectable Stereo Class-AB Audio Amplifier Table 6: DC Volume Control DATASHEET TD9772A Techcode® 4 Inputs Selectable Stereo Class-AB Audio Amplifier DATASHEET TD9772A Absolute Maximum Ratings Supply voltage, AVDD, PVDD Inputs (Line1/Line2, Line3/Line4, BTL/Straight/SE, Lin1-4, Volume, VLM/Mute, Bypass) 7.5V -1.5V to VDD+1.5V Recommended Operating Conditions Supply voltage,AVDD,PVDD Logic inputs (Line1/Line2, Line3/Line4, BTL/Straight/SE) Signal inputs (Lin1 to Lin4, Volume, VLM/Mute) Temperature (Ambient) Temperature (Junction) 2.5V to 5.5V -0.3V to AVDD+0.3V 0V to AVDD-1.0V -20C to 85C -20C to 125C Techcode® DATASHEET TD9772A 4 Inputs Selectable Stereo Class-AB Audio Amplifier Electrical Characteristics Operating Characteristics，BTL mode. VDD=5V，TA=25˚C，RL=4Ω（unless otherwise specified） Parameter Supply Voltage Symbol Test Conditions VDD Quiescent Current Iq Vos Under Voltage Lockout UVLO No Load SE/ST/BTL=0V Drain-Source On-State Resistance Input Crosstalk 5 10 6.5 THD+N PSRR RDS(ON) IC 16 2.9 THD=10%， RL=4Ω，Fin=1kHz 2.6 THD=10%， RL=8Ω，Fin=1kHz 1.6 THD=1%， RL=3Ω，Fin=1kHz 2.4 THD=1%， RL=4Ω，Fin=1kHz 1.8 mA mV 2 THD=10%， RL=3Ω，Fin=1kHz V 10 1.1 No Load V W THD=0.5%，RL=8Ω，Fin=1kHz Power Ripple Rejection Ratio 8 Max Units 5.5 PO Maximum Output Power Total Harmonic Distortion Plus Noise Typ 2.5 No Load SE/ST/BTL=50V Output Offset Voltage Min 1 1.3 PO=2.6W，RL=4Ω，Fin=1kHz BTL 0.05 PO=75mW,RL=32Ω，Fin=1kHz SE 0.02 VIN=0.1Vrms，RL=8Ω，CB=1µF， Fin=120Hz 60 dB IDS=1.6mA P MOSFET 144 mΩ IDS=1.6mA N MOSFET 147 CB=2.2uF，RL=4Ω，f=1KHz -40 % dB October, 20, 2010. Techcode Semiconductor Limited www.techcodesemi.com 10 Techcode® DATASHEET TD9772A 4 Inputs Selectable Stereo Class-AB Audio Amplifier Electrical Characteristics(Cont.) Operating Characteristics，BTL mode. VDD=5V，TA=25˚C，RL=4Ω（unless otherwise specified） Parameter Symbol Oscillator Frequency fOSC Test Conditions Min 207 Typ 250 η RL=4Ω ，PO=2.6W，f=1KHz，BTL 71 Signal Noise Ratio SNR RL=4Ω ，PO=2.6W，f=1KHz，BTL 97 Input Logic Voltage VIL Efficiency 313 2.0 Volume Input Range Vol 0 Mute Voltage Vmute Output Voltage Limit VLML Output Driver at tri-stated 0.5 0.7 1.8 KHz % dB 0.8 VIH VLMH Max Units V V 0.6 0.8 AVDD1.0 V 0.7 V 0.9 2.0 V V October, 20, 2010. Techcode Semiconductor Limited www.techcodesemi.com 11 Techcode® DATASHEET 4 Inputs Selectable Stereo Class-AB Audio Amplifier TD9772A Application Descriptions Input Mux Operation The TD9772A has 4 selectable inputs: Line1 input, Line2 input, Line3 input and Line4 input. The input MUX allows these four separate inputs to be applied to the amplifier. This allows the designer to choose which input is active independent of the state of the Line1/Line2 and Line3/Line4 terminals (see Table 1). Output SE/Straght Through/BTL Operation The ability of the TD9772A to easily switch between different output modes is one of its most important costs saving features. Internal to the TD9772A, three output states (BTL, Straight Through, SE) are designed. As shown in Table2 ,When the output pin is connected to a speaker, the pin BTL/Straight Through/SE is connected to a logic low voltage(<0.8V) and the output mode is selected as BTL mode. At the same time, the gain of the amplifier is the gain corresponding to BTL(see Table 4). Similarly, the SE output mode and SE gain (see Table 5) can be in effect when an earphone is inserted, at which time a logic high voltage (>AVDD‐0.8V) is connected to the pin BTL/Straight Through/SE. The output is selected as ST(Straight Through) mode in other cases . when the pin VLM/MUTE is connectedto a voltage, which is bigger than 2V. Under Voltage Lock‐out (UVLO) The TD9772A incorporates circuitry designed to detect when the supply voltage is low. When the supply voltage drops to 1.8V or below, the TD9772A outputs are disabled, and the device comes out of this state and starts to normal functional once VDD≥2.0V. Current Limit The TD9772A has current limit circuitry on the outputs that prevents the device from being damaged when the outputto‐ output, output‐to‐VDD and output to GND short.When a short circuit is occuring, the max current of output is clamped in 2A. Optimizing Depop Circuitry Rapid on/off switching of the device will cause the click and pop noise. Circuitry has been included in the TD9772A to minimize the amount of popping noise when the chip is powered on. Mute and Power limit Operation The VLM/MUTE pin is an input for controlling the mute and power‐limit function of the TD9772A(see Table 3).When a logic low(<0.7V) is connected on this pin makes the chip in mute mode (Min Gain). When a limit voltage (0.7V~1.9V), the swing of output voltage is clamped between VPL (AVDD/2‐(VLM+0.6V)) and VPH(AVDD/2+(VLM+0.6V)) . The output voltage is not be clamped and the chip is not be mute October, 20, 2010. Techcode Semiconductor Limited www.techcodesemi.com 12