Maker : YAMAHA CORPORATION
Part No. : YDA145

  Datasheet PDF : YDA145.pdf
  Cross Reference : YDA145 Cross Reference
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Product Information

YDA145 D- 4H MONAURAL 2.1W Non-Clip DIGITAL AUDIO POWER AMPLIFIER ■Overview YDA145 (D-4H) is a digital audio power amplifier IC with maximum output of 2.1W (RL=4Ω)×1ch. YDA145 has a “Pure Pulse Direct Speaker Drive Circuit” which directly drives speakers while reducing distortion of pulse output signal and reducing noise on the signal, and realizes the highest standard low distortion rate characteristics and low noise characteristics among digital amplifier ICs for mobile use. In addition, circuit design with fewer external parts can be made depend on the condition of use because corresponds to filter less. The YDA145 features Yamaha original non-clip output control function which detects output signal clip due to the over level input signal and suppress the output signal clip automatically. Also the non-clip output control function can adapt the output clip caused by power supply voltage down with battery. This is the difference from the traditional AGC (Auto Gain Control) or ALC (Auto Level Control) circuit. YDA145 has the power-down function which can minimize the power consumption in the standby state. As for protection function, overcurrent protection function for speaker output terminal, overtemperatue protection function for inside of the device, and low supply voltage malfunction preventing function are prepared. ■Features ・Maximum output 2.1 W×1ch (VDD=5.0V, RL=4Ω, THD+N=10%) 0.75 W×1ch (VDD=3.6V, RL=8Ω, THD+N=10%) ・Distortion Rate (THD+N) 0.03 % (VDD=3.6V, RL=8Ω, Po=0.4W, 1kHz) ・Residual Noise 45µVrms (VDD=3.6V, Av=18dB) www.DataSheet4U.com ・Efficiency 84 % (VDD=3.6V, RL=8Ω, Po=600mW) 78 % (VDD=3.6V, RL=8Ω, Po=100mW) ・S/N Ratio 94dB (VDD=3.6V, Av=18dB) ・Over-current Protection function ・Thermal Protection function ・Low voltage Malfunction Prevention function ・Pop noise reduction function ・Power-down control function ・Power-down High speed Recovery function ・Package Lead-free 9-ball WLCSP (YDA145-PZ) YDA145 CATALOG CATALOG No.:LSI-4DA145A30 2007.10 YDA145 ■Terminal configuration <9-ball WLCSP Bottom View> ■Terminal function No. Name I/O Protection circuit composition Function A1 A IN+ PN Positive input terminal (differential +) A2 Power VDD Power supply A3 O OUT+ Positive output terminal (differential +) B1 GND AGND GND for analog circuits B2 A VREF PN Analog reference power supply terminal B3 GND PGND GND for output www.DataSheet4U.com C1 A INPN Negative input terminal (differential -) C2 I CTRL N Power down and Non-clip control terminal C3 O OUTNegative output terminal (differential -) (Note) I: Input terminal O: Output terminal A: Analog terminal When a voltage that is bigger than the AVDD potential is impressed to the terminal of PN (protection circuit is composed of PMOS and NMOS), the leakage current flows through the protection circuit of PMOS. 2 YDA145 ■Block diagram www.DataSheet4U.com 3 YDA145 ■Description of operating functions ●Digital Amplifier Function YDA145 has digital amplifiers with analog input, PWM pulse output, and maximum output of 2.1W(RL=4Ω)×1ch. Distortion of PWM pulse output signal and noise of the signal is reduced by adopting “Pure Pulse Direct Speaker Drive Circuit”. In addition, YDA145 has been designed so that high-efficiency can be maintained within an average power range (100mW or so) that is used for mobile terminal. Analog signal input For a differential input, input signals to IN+ and IN- pins via DC-cut capacitors (CIN). The input signal gain is +18dB*1). And, with an input impedance of 28.5kΩ (typ.), a lower cut-off frequency of an input signal becomes 169Hz at CIN=33nF. For a single-ended input, input a signal to IN+ via a DC-cut capacitor (CIN). At this time, IN- pin should be connected to AVSS via a DC-cut capacitor (CIN) with the same capacitance. Gain and a lower Cut-off frequency are the same as the above case. In addition, the output impedance (Zout) of the former source circuit, including signal p...

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