YDA137 Datasheet, PDF (4/20 Pages) YAMAHA CORPORATION – D- 2 STEREO 5W DIGITAL AUDIO POWER AMPLIFIER

■Description of terminal functions
YDA137
Hereafter, in the description, L and H in /SLEEP terminal, /MUTE terminal, /MONO terminal, and HP terminal indicate
VIL and VIH respectively, and L and H in /PROT terminal, OUTPL terminal, OUTML terminal, OUTPR terminal, and
OUTMR terminal indicate VOL and VOH respectively.
In addition, WL indicates weak ground output, and RF indicates reference level output.
●Power Supply Terminals, Ground Terminals
VDDL, VSSL, VDDR, VSSR (Pin No.4, 14, 25, 15)
VDDL, VSSL terminal is a 5.0V power supply terminal, a ground terminal respectively for L channel signal processing
circuit.
VDDR, VSSR terminal is a 5.0V power supply terminal, a ground terminal respectively for R channel signal processing
circuit.
L channel, R channel has independent power supply terminal and ground terminal respectively.
All ground terminals are connected to the board (low resistance), but power supply terminals for L, R are separated.
VDDPL, VSSPL1, VSSPL2, VDDPR, VSSPR1, VSSPR2 (Pin No.7, 9, 5, 22, 20, 24)
VDDPL, VSSPL1, VSSPL2 terminal is a 5.0V power supply terminal, ground terminals respectively for L channel
digital amplifier output and L channel headphone amplifier output.
VDDPR, VSSPR1, VSSPR2 terminal is a 5.0V power supply terminal, ground terminals respectively for R channel
digital amplifier output and R channel headphone amplifier output.
L channel, R channel has independent power supply terminal and ground terminal respectively.
All ground terminals are connected to the board (low resistance), but power supply terminals for L, R are separated.
Voltage is supplied to VDDL, VDDR, VDDPL, and VDDPR terminal to the same timing.
VSS (Pin No.1)
VSS terminal is a ground terminal for protection circuit and control circuit.
●Analog Terminals
INL, VPL, INR, VPR (Pin No.12, 11, 17, 18)
INL, VPL terminal is an analog signal input terminal, a gain setting terminal respectively for L channel digital amplifier.
INR, VPR terminal is an analog signal input terminal, a gain setting terminal respectively for R channel digital amplifier.
Simple filter such as a low frequency boost can be configured by using an operational amplifier for the first gain setting.
These terminals are combined with an input for headphone amplifier.
VREFL, VREFR (Pin No.13, 16)
VREFL terminal is a reference voltage output terminal for L channel. Half of 5.0V power supply terminal (VDDL)
voltage is output.
VREFR terminal is a reference voltage output terminal for R channel. Half of 5.0V power supply terminal (VDDR)
voltage is output.
Connect a necessary capacitance (See the item of “Pop Noise Rejection Function”) to each reference voltage output
terminal to make the voltage stable.
OUTPL, OUTML, OUTPR, OUTMR (Pin No.6, 8, 23, 21)
OUTPL, OUTML terminal is a digital amplifier output terminal for L channel. PWM modulated digital pulse signal is
output. OUTPL is a positive output terminal, and OUTML is a negative output terminal.
OUTPR, OUTMR terminal is a digital amplifier output terminal for R channel. PWM modulated digital pulse signal is
output. OUTPR is a positive output terminal, and OUTMR is a negative output terminal.
Since both channels are specified as BTL（Bridge-Tied Load） output, negative output terminal is not in the ground
potential.
In addition, connect these to the speaker through a LC filter according to the example of application circuit to reject
carrier frequency.
HPOL, HPOR (Pin No.10, 19)
HPOL terminal is a headphone output terminal for L channel.
HPOR terminal is a headphone output terminal for R channel.
4