Features: ・High Output Power ・CS(Channel Separation)
5.0 W@VDD=5.0V, RL=2, THD+N<10% 80dB @ 1kHz
3.7 W @ VDD=5.0V, RL=3, THD+N<10% ・Class AB headphone amp. is embedded.
3.0 W @ VDD=5.0V, RL=4, THD+N<10% 20mW @ VDD=5.0V, RL=16, THD+N<1.0%
・High Efficient Operation ・Arbitral gain setting with external resistor is possible.
75 % @ VDD=5.0V, RL=2, Po=5W ・Sleep function by /SLEEP terminal
80 % @ VDD=5.0V, RL=3, Po=3W ・Output mute function by /MUTE terminal
・Low Distortion Rate (THD+N) ・Output Over-Current Protection Function
0.03 % @ 1kHz, RL=2, Po=2.5W (Ground short-circuit/Load short-circuit)
0.02 % @ 1kHz, RL=3, Po=1.5W ・Over-Temperature Protection Function
・High S/N Ratio ・Auto Resume Function from Over-Current,
105dB @VDD=5.0V, input sensitivity 1.0Vrms, High-Temperature Protection.
RL=2, Po=5W ・Monaural Function by /MONO terminal
98dB @VDD=5.0V, input sensitivity 150mVrms, ・Pop Noise Rejection Function at power-up or
RL=2, Po=5W power-cutoff
・IC Low Consumption Current ・Analog input / BTL(Bridge-Tied Load) output
25 mA @ VDD=5.0V, no signal (no filter) ・28pin plastic TSSOP
10 mA @ VDD=5.0V, at mute pin lead plating with Pd-free (YDA137-AZ)
1 A @ VDD=5.0V, at sleep
Pinout
Specifications
| Item |
Symbol |
Min. |
Max. |
Unit |
| VDD terminal voltage range Note 1, 2, 3) |
VDD |
-0.3 |
6.0 |
V |
| Input/Output terminal voltage range Note 4) |
VIN |
VSS-0.5 |
VDD+0.5 |
V |
| Allowable dissipation (Ta=25) |
PD |
|
3.0 |
W |
| Storage Temperature |
TSTG |
-50 |
125 |
|
Note 1) VSS means VSSL, VSSR, VSSPL1, VSSPL2, VSSPR1, and VSSPR2. Place all VSS terminals in the same potential.
Note 2) The voltage is based on VSS=0V.
Note 3) VDD terminal means VDDL, VDDR, VDDPL, and VDDPR.
Note 4) Input/output terminal means /SLEEP, /MUTE, /PROT, HP, /MONO, INL, VPL, VREFL, INR, VPR, and REFR.
Note 5) Absolute Maximum Ratings is values which must not be exceeded to guarantee device reliability and life, and when using device in excess even a moment, it may cause damage to device or deteriorate its reliability severely.
DescriptionYDA137 (D-2) is a high efficient digital audio power amplifier IC that operates on a single 5V power supply.
With YDA137 in BTL connection, an audio power amplifier with a maximum output of 5W (RL=2)*2ch can be configured with one chip.
YDA137 converts an input analog data into a digital pulse by the digital modulation circuit in the IC and outputs a high current digital pulse from the output buffer circuit. This digital pulse signal is converted into an audio signal by an external low-pass filter and is output to the speaker.
Low-distortion rate characteristics and high S/N ratio are realized as a digital amplifier among same class, by adopting Yamaha's unique modulation system.In addition, class AB headphone amplifier with output of 20mW (RL=16)*2ch is embedded and switching between digital amplifier output and headphone amplifier output can be done by the control of terminal termination. YDA137 has the over-current protection function for speaker terminals, the high-temperature protection function for IC, and the pop noise rejection function.
IC operation of YDA137 can be restricted by the two control signals of /SLEEP and /MUTE. /SLEEP signal can stop all functions and decrease the consumption power to a minimum. In addition, /MUTE signal can pull-down the output buffer (hereinafter, described as WL) and make the output mute.
YDA137 Data Sheet
