Yamaha YDA138 User Manual

YDA138

D- 3

STEREO 10W DIGITAL AUDIO POWER AMPLIFIER

■Overview

YDA138 (D-3) is a high efficient digital audio power amplifier IC that operates with a single 12V power supply.
An audio power amplifier with a maximum output of 10W (R
with one chip.
YDA138 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 as 10W-class of output digital amplifier IC.
In addition, circuit design with fewer external parts can be made depend on the condition of use because corresponds to
filter less.
YDA138 has 50mW (R
YDA138 provides Over-current protection function for speaker output terminals, IC thermal protection function, POP
noise reduction function, and AM interference measures function as well as power-down function and output mute
function.

=32Ω)×2ch Class AB headphone amplifiers.

L

■Features

=8Ω)×2ch or 20W (RL=4Ω)×1ch can be configured

L

Digital Amplifier

・Continuous maximum output

10 W×2ch ＠V
20 W×1ch ＠V

・Efficiency

88 % ＠V

・Distortion Rate (THD+N)

0.02 % ＠V

・S/N Ratio

103dB ＠V

・Channel Separation

-70dB ＠V

Class AB Headphone Amplifier

・Maximum output

50mW×2ch ＠V

・Distortion Rate(THD+N)

0.01 % ＠V

・S/N Ratio

95dB ＠V

DDP

DDP

=12.0V, RL=8Ω, THD+N=10%

DDP

=12.0V, RL=4Ω, THD+N=10%

DDP

=12.0V, RL=8Ω, Po=10W

=12.0V, RL=8Ω, Po=1.0W

DDP

=12.0V, RL=8Ω, Po=10W, VOL[1:0]=H,H

DDP

=12.0V, RL=8Ω, VOL[1:0]=H,H

DDP

DDP

=12.0V, RL=32Ω, Pho=30mW

DDP

=12.0V, RL=32Ω, Pho=20mW, VOL[1:0]=H,H

=12.0V, RL=32Ω, THD+N=10%

Others

・Operating power supply range

9.0V to 13.5V

・Multi-channel synchronizing operation by

Master/Slave switching function

・Carrier frequency switching function

524kHz/466kHz

・Sleep function with SLEEPN terminal
・Output muting function with MUTEN terminal
・Over-current protection function
・Thermal protection function
・Clock stop detection function
・Pop noise reduction function
・AM interference measures function
・Analog input/BTL (Bridge-Tied Load) output
・42-pin plastic SSOP

Pin lead plating with Pd free (YDA138-EZ)

YDA138 CATALOG

CATALOG No.:LSI-4DA138A20

2005.3

YDA138

■Terminal configuration

<42-pin SSOP Top View>

2

YDA138

■Terminal function

No. Name I/O Function

1 HPOR O R-ch Headphone Output terminal LV
2 AVSS Pow 5V Analog Ground terminal LV
3 VSSBGR Pow Ground terminal for Reference Voltage Supply LV
4 VREFR O R-ch Reference Voltage terminal (with external capacitor) LV
5 INR I R-ch Analog Signal Input terminal LV
6 MUTEN I Mute Control terminal LV
7 PVDDPR Pow R-ch 12V-line VDD terminal HV
8 OUTPR O R-ch Positive Side Output terminal HV

9 PVSSR Pow R-ch 12V-line VSS terminal HV
10 PVSSR Pow R-ch 12V-line VSS terminal HV
11 PVSSR Pow R-ch 12V-line VSS terminal HV
12 PVSSR Pow R-ch 12V-line VSS terminal HV
13 PVSSR Pow R-ch 12V-line VSS terminal HV
14 OUTMR O R-ch Negative Side Output terminal HV
15 PVDDMR Pow R-ch 12V-line VDD terminal HV
16 PROTN O Warning Signal Output terminal (O/D) HV
17 SLEEPN I Sleep Control terminal HV
18 DVSS Pow Digital Ground terminal LV
19 CKIO I/O Clock Input/Output terminal LV
20 XO O CERALOCK connection terminal *1 LV
21 XI I CERALOCK connection terminal *1 LV
22 DVDD I Digital Power Supply terminal (Connect to REFA terminal

outside the IC)
23 MODE0 I Operating Mode Selection terminal LV
24 MODE1 I
25 MODE2 I
26 VOL0 I Input Sensitivity Setting terminal LV
27 VOL1 I Input Sensitivity Setting terminal LV
28 PVDDML Pow L-ch 12V-line VDD terminal HV
29 OUTML O L-ch Negative Side Output terminal HV
30 PVSSL Pow L-ch 12V-line VSS terminal HV
31 PVSSL Pow L-ch 12V-line VSS terminal HV
32 PVSSL Pow L-ch 12V-line VSS terminal HV
33 PVSSL Pow L-ch 12V-line VSS terminal HV
34 PVSSL Pow L-ch 12V-line VSS terminal HV
35 OUTPL O L-ch Positive Side Output Terminal HV
36 PVDDPL Pow L-ch 12V-line VDD terminal HV
37 HP I Headphone Control terminal LV
38 INL I L-ch Analog Signal Input terminal LV
39 VREFL O L-ch Reference Voltage terminal (with external capacitor) LV
40 PVDDREG Pow 12V-line PVDD terminal for Regulator Circuit HV
41 REFA O 5V Regulator Output terminal (with external capacitor) LV
42 HPOL O L-ch Headphone Output terminal LV

(Note) I: Input terminal, O: Output terminal, I/O: Input/Output terminal, Pow: Power supply terminal

LV: Terminal for V
HV: Terminal for V

*1: CERALOCK which was described above and will be described later is a registered trade mark of

Murata Manufacturing Co.,Ltd.

Operating Mode Selection terminal

Operating Mode Selection terminal

power supply voltage range as input voltage range.

REG

power supply voltage range as input voltage range.

DDP

Voltage

tolerance

LV

LV
LV

3

■Block diagram

YDA138

4

YDA138

■Mode setting

・Operating Mode

Outline

SLEEPN

MUTEN

HP

MODE[2:0]

L * * * WL WL WL WL Z Z Sleep mode

H L L * WL WL WL WL Z - DA Mute mode

H L H * WL WL RF RF Z - HA Mute mode

H H L LLL P-H P-H WL WL Z - DA External Clock Slave mode

H H L LLH P-L P-L WL WL Z - DA External Clock Slave mode

H H L LHL P-H P-H WL WL Z - DA External Clock Master mode

H H L LHH P-L P-L WL WL Z - DA External Clock Master mode

H H L HLL PLS PLS WL WL Z - DA Internal Clock Slave mode

H H L HHL PLS PLS WL WL Z - DA Internal Clock Master mode

H H H * WL WL SIG SIG Z - HA mode

H * * LL* - - - - - CKIN 4.19MHz Clock Input

H * * LH* - - - - - CKOUT 4.19MHz Clock Output
H * * HLL - - - - - CKIN ≒500kHz Input (Internal Clock)
H * * HHL - - - - - CKOUT ≒500KHz Output (Internal Clock)

Note:

1) “H” and “L” means logic level High and logic level Low, respectively.

2) “WL” means output disabled (weak pull-down output). “RF” means reference level output. “Z” means Hi-Z.

3) “P-H” means a carrier clock of 524kHz. “P-L” means a carrier clock of 466kHz. “PLS” means a carrier clock of

approx. 500kHz (Internally generated clock).

4) “SIG” means an analog audio signal output.

5) “CKIN” means input of a clock with designated frequency. “CKOUT” means output of a designated clock.

6) “DA” means Digital Amplifier. “HA” means Headphone Amplifier.

7) Each output of OUT*L, OUT*R, HPOL, HPOR, PROTN, and CKIO becomes a state as shown in “Protection

Mode”, depending on the protection state, when entering protection state from a mode except sleep mode.

8) In monaural mode, OUT*R signal as shown in the above “Operating Mode” becomes the same as OUT*L signal.

And, HPOR becomes “WL.”

9) In operating modes indicated by *A), a state of the output signal becomes a state as shown in “Protection Mode”

during a protection mode.

10) “HLH” and “HHH” of MODE[2:0] is reserved for system use.

・Protection Mode

OUT*L

OUT*R

HPOL

HPOR

PROTN

CKIO

*A)

*A)

*A)

*A)

*A)

*A)

*A)

*A)

*A)

Outline

SLEEPN

MUTEN

HP

MODE[2:0]

OUT*L

OUT*R

HPOL

HPOR

PROTN

H H L * WL WL WL WL L Z Digital Amplifier Over-current Protection

H * * * WL WL WL WL L Z Over-Temperature Protection

H * * * WL WL - - - - Clock Stop Protection

H * * * WL WL WL WL Z Z Low Voltage Malfunction Prevention Protection

H H * * WL WL RF RF - - Power Supply Voltage Fluctuation Protection

CKIO

Note:

1) Each protection function operates when input terminal is in the designated logic condition. Output terminal

becomes a state as shown in the above during protection mode.

5

YDA138

■Description of operating functions

●Digital Amplifier Function

YDA138 has digital amplifiers with analog input, PWM pulse output, Maximum output of 10W (R
Distortion of PWM pulse output signal and noise of the signal is reduced by adopting “Pure Pulse Direct Speaker Drive
Circuit”

First Stage Amplifier Gain Setting Function

YDA138 is composed of the first stage amplifier with gain setting control and 18dB fixed-gain digital amplifier. Gain of the
first stage amplifier can be set by VOL[1:0] terminal.

Digital Amplifier Gain Setting

VOL[1:0] L,L L,H H,L H,H
Gain 36dB 30dB 24dB 18dB
Input Sensitivity 0.14V 0.28V 0.56V 1.12V
Input Impedance 12.1kΩ 22.0kΩ 37.1kΩ 56.5kΩ

Connect a 1µF or more capacitor to the audio signal input terminal (INL and INR) for the rejection of DC signal.
And, half voltage of REFA terminal voltage (V

) is output to the reference voltage terminals (VREFL and VREFR).

REG

Connect a 1µF or more capacitor to the terminals for voltage stabilization.

Carrier Clock Selection Function

YDA138 can select the followings by using MODE[2:0] terminal: selection of Internal clock/External clock, selection of
Master mode/Slave mode, selection of carrier clock frequency.

MODE[2:0] setting and each operating mode

MODE[2:0] Operating Mode CKIO terminal CERALOCK Carrier Clock Frequency

L,L,L 524kHz
L,L,H
L,H,L 524kHz

L,H,H

H,L,L

External Clock
Slave Mode
External Clock
Master Mode

Internal Clock
Slave Mode

4.19MHz input Unnecessary

4.19MHz output Necessary

466kHz

466kHz

500kHz input Unnecessary 500kHz

H,L,H Reserved

H,H,L

Internal Clock
Master Mode

500kHz output Unnecessary 500kHz

H,H,H Reserved

When using in External Clock Mater Mode, connect a 4.19MHz resonator (CERALOCK) between XI terminal and XO
terminal. No external element to XI terminal and XO terminal is necessary, when using in Internal Clock Master Mode.
When using in multi-channel, use one YDA138 (2ch) in Master Mode and use other YDA138 in Slave Mode. At this time,
connect CKIO terminal of YDA138 used in Master Mode and that of YDA138 used in Slave Mode. In addition, select the
same clock (either Internal Clock or External Clock) in all YDA138.
In an application with AM tuner, harmonic wave of carrier clock and interference of AM carrier frequency can be prevented
by changing carrier clock frequency. The setting terminal for carrier clock frequency (MODE0) can be changed at any
timing.
The setting terminal for clock mode (MODE2, MODE1) should be changed during power-off or sleep mode (SLEEPN=L).

=8Ω)×2ch.

L

6

YDA138

●Headphone Amplifier Function

YDA138 has class AB single-ended push-pull headphone amplifier. Headphone amplifier mode can be set by setting HP
terminal to H. Audio signal input terminal and voltage reference terminal is common to digital amplifier.
Connect DC-cut capacitor to headphone amplifier output terminal (HPOL and HPOR).
When a headphone amplifier is not used, HP terminal should be "L" and output terminal (HPOL, HPOR) should be "No
Connection".

First stage Amplifier Gain Setting function

Headphone amplifier is composed of the first stage amplifier of which gain setting is possible, and 0dB fixed-gain
amplifier. Gain of the first stage amplifier can be set by VOL[1:0] terminal.

Headphone Amplifier Gain Setting

VOL[1:0] L,L L,H H,L H,H
Gain 18dB 12dB 6dB 0dB
Input sensitivity 0.14V 0.28V 0.56V 1.12V
Input Impedance 12.1kΩ 22.0kΩ 37.1kΩ 56.5kΩ

●Control Function

Sleep Function

When SLEEPN terminal is L, YDA138 enters the Sleep Mode.
In Sleep mode, all the circuit functions including 5V regulator are stopped to minimize the consumption current. At this
time, output stages of digital amplifier and headphone amplifier are disabled and PROTN and CKIO terminal output
becomes “Hi-Z”.

Mute Function

When MUTEN terminal is set to L while HP terminal is L, YDA138 enters the Digital Amplifier Mute mode. In this mode,
output stage of Digital Amplifier is disabled.
When MUTEN terminal is set to L while HP terminal is H, YDA138 enters the Headphone Amplifier Mute Mode. In this
mode, output stage of Headphone Amplifier outputs the reference voltage.

Headphone Selection Function

When HP terminal is set to H, YDA138 enters the Headphone Amplifier mode. At this time, output stage of Digital
Amplifier is disabled. On the contrary, when HP terminal is set to L, YDA138 enters Digital Amplifier mode. At this time,
output of the Headphone Amplifier output is disabled.
When logic of HP terminal is changed, YDA138 restarts and as the result of it, all the protection states are cleared.

Monaural Selection Function

YDA138 enters the Monaural mode, when connecting VREFR terminal to REFA terminal and then connecting INR
terminal to AVSS terminal.
In Digital Amplifier Monaural Ｍode, maximum continuous output 20W can be obtained by short-circuiting between
OUTPL terminal and OUTPR terminal and between OUTML terminal and OUTMR terminal to drive 4Ω load resistor.
In Headphone Amplifier Monaural Mode, HPOUTL terminal outputs signals and HPOUTR terminal is disabled.

7

YDA138

●Protection Function

YDA138 has Over-current Protection function and Clock Stop Protection function as protection functions for the digital
amplifier. In addition, it has Output Current Limit function as a protection function for headphone amplifier. Moreover,
YDA138 has Thermal Protection function, Low-voltage Malfunction Prevention function, and Power Supply Voltage
Fluctuation Protection function commonly.

Over-current Protection Function

This is a function to make the Over-current Protection Mode (disables the output stage of digital amplifier in addition to the
output of L signal to PROTN terminal) by detection of short-circuiting (Ground short/Power supply short/Speaker terminal
short) in the output stage of digital amplifier.
The over-current protection function can be canceled by power off or setting L to SLEEPN terminal and can be
automatically returned after the over-current detection by connection of PROTN terminal and SLEEPN terminal.

Thermal Protection Function

This is a function to make the Thermal Protection Mode (disables the output stage of digital amplifier and headphone
amplifier in addition to the output of L signal to PROTN terminal) by detecting extraordinary high temperature of YDA138.
This Thermal Protection mode can be cancelled by lowering temperature of YDA138, power off, or setting L to SLEEPN
terminal and can be automatically returned after the extraordinary high temperature detection by connection of PROTN
terminal and SLEEPN terminal.

Clock Stop Protection Function

This is a function to make the Clock Stop Protection mode (disables the output stage of digital amplifier) when carrier clock
frequency was extraordinarily lowered in digital amplifier mode.
The Clock Stop Protection mode can be cancelled by returning carrier clock frequency to the right value.

Low-voltage Malfunction Prevention Function

This is a function to make the Low-voltage Protection mode (disables the output stage of digital amplifier and headphone
amplifier in addition to making “Hi-Z” of PROTN terminal) when voltage at 12V-line power terminal (PVDDREG)
becomes lower than Low-voltage detection threshold voltage (V
becomes lower than the voltage (V

UVAL

).

In addition, when voltage at 12V-line power supply terminal becomes lower than V

) or voltage at 5V-line power terminal (REFA, DVDD)

UVPL

5V embedded regulator is also

UVPL,

disabled.
The Low-voltage Protection mode is cancelled when voltage at each power supply terminal exceeded the low-voltage
cancellation threshold voltage (V

UVPH,VUVAH

).

Power Supply Voltage Detection Function

This is a function to make Mute mode when voltage at 5V Regulator output terminal (REFA) fluctuated (V

MH,VML

) with

respect to twice of the voltage of reference terminals (VREFL,VREFR).

Headphone Amplifier Output Current Limit Function

YDA138 headphone amplifier has a Current-Limit-Circuit which limits output current so as not to exceed the limit current
(I

).

OCHP

●5V Regulator Function

YDA138 outputs 5V to REFA terminal when SLEEPN terminal is H. Connect a 1µF or more capacitor to REFA terminal
for voltage stabilization.
Connect REFA terminal to DVDD terminal on a board. And, do not connect the REFA terminal to other terminals except
for DVDD terminal and YDA138 control terminals.

8

YDA138

●Pop Noise Reduction Function

The Pop Noise Reduction Function works in the following cases: Power-on, Power-off, Sleep ON/OFF, Mute ON/OFF, and
switching time between headphone amplifier and digital amplifier.
Pop noise at the Power-on, Power-off, and Sleep ON/OFF depends on the value of DC-cut capacitor for audio input signal.
The smaller the value, the greater the effect on the pop noise reduction; however, 1µF of capacitance is recommended in the
consideration of the low frequency cutoff.

●Correspond to Filter less

Normally, when LC filter is not used, carrier signal of 50% modulation comes into speaker even in MUTE state and causes
significant loss, and as the result the speaker is heated.
Generally, 10W speaker or so is considered to have inductance component of not less than 20µH.
In the modulation method of YDA138, duty ratio of the carrier signal is several % in the MUTE state, so the speaker
inductance component can sufficiently inhibit speaker loss without LC filter; therefore, the speaker is not heated.

●Speaker Inductance

When YDA138 is used without LC filter, speaker inductance component reduces speaker loss in the MUTE state; therefore,
use a speaker with inductance component of 20µH or more at the carrier clock frequency.

●LC Filter

When connecting LC filters to YDA138, make the following LC filter circuit. Use the following constant in accordance
with speaker impedance. By using the following constant, low-pass filter with cutoff frequency=50kHz or so, Q=0.7 or so is
configured.

LC Filter Constant

RL L1 C1 C2
4Ω 10μH 0.47μF 0.01μF
8Ω 22μH 0.22μF 0.01μF

16Ω 47μH 0.11μF 0.01μF

9

YDA138

●Allowable Dissipation

The power dissipation of YDA138 is limited by the junction temperature rating (125℃) and package thermal resistance
(35.9℃/W).
The power dissipation and junction temperature of YDA138 can be found by the following formula.

For the use of YDA138, take care not to exceed the power dissipation and junction temperature.

・Formula for the Power Dissipation

Ploss = (Pout * Rpn / Rl) * 2 + Idc * Vdc

Ploss ：Allowable Dissipation (W)
Pout ：Output Power (W)
Rpn ：0.66 (Constant)
Rl ：Load Resistor (Ω)
Idc ：0.035(Constant / at V

0.028(Constant / at V

0.038(Constant / at V

Vdc ：Power supply voltage (V)

DDP

DDP

DDP

=12V)

=9V)
=13.5V)

4.0

3.5

3.0

2.5

2.0

1.5

1.0

最大許容損失　(W)

0.5

Maximum allowable dissipation (W)

0.0
0 1020 30405060 708090

最大許容損失 vs 周囲温度

Maximum allowable dissipation vs ambient temperature

周囲温度　(℃)

Ambient temperature (℃)

Maximum allowable dissipation of YDA138

・Formula for the junction temperature

YDA138 の最大許容損失

Tj = Ploss * θja + Ta

Ploss ：Allowable Dissipation (W)
θja ：35.9 (Constant/ package thermal resistance (℃/W))
Ta ：Ambient Temperature (℃)

●Mounting

The package (42SSOP) for YDA138 has Thermal Pad for radiation on the bottom. This Thermal Pad does not need
soldering on the board.

・Example of Pattern

Thermal resistance of the package is 35.9℃/W. This thermal resistance was measured under the following conditions:
mounting board 136mm×85mm, copper leaf board density 154%, no wind. In addition, a part of the board that faces to
Thermal Pad is a pattern (4mm*6mm) without etching resist, the pattern is connected to the opposite side by through-hole
(φ0.4).

10

YDA138

■Application circuit examples

●2-channel Operating Mode (Internal Clock Master Mode)

ID Value Element ID Value Element
C1 1μF Multilayer ceramic capacitor R1 100kΩ Chip Resistor
C2 1μF Multilayer ceramic capacitor R2 1kΩ Chip Resistor
C3 0.1μF Multilayer ceramic capacitor R3 100kΩ Chip Resistor
C4 10μF Electrolytic capacitor

(0.1μF Ceramic capacitor)

C5,C6 4.7μF Multilayer ceramic capacitor R5 1MΩ Chip Resistor

C7 330μF Electrolytic capacitor U1 (CERALOCK) CSTCR4M19G53-B0

11

R4 680Ω Chip Resistor

●Monaural Operating Mode (Internal Clock Master Mode)

YDA138

12

YDA138

●Multi-channel Operating Mode

13

YDA138

■Electrical characteristic

Note 6)

●Absolute Maximum Ratings

Item Symbol Min. Max. Unit

Power supply terminal (VDDP) Voltage Range

SLEEPN, PROTN terminal Voltage Range V

CKIO Input/Output terminal Voltage Range V

Voltage Range of terminals for control

Voltage Range of Input/output terminals

Allowable dissipation (Ta=25ºC) P

Allowable dissipation (Ta=70ºC) P

Junction temperature T

Storage Temperature T

Note 1) VSS means AVSS, VSSBGR, DVSS, PVSSR and PVSSL. Place all VSS terminals in the same potential.
Note 2) All the voltages are measured with respect to V
Note 3) Power supply terminal (VDDP) means PVDDREG, PVDDPR, PVDDMR, PVDDPL and PVDDML.
Note 4) Control Input/Output terminal means MUTEN, HP, VOL[1:0] and MODE[2:0].
Note 5) Input/output terminal means INL, VREFL, INR, VREFR, XI and XO.
Note 6) Absolute Maximum Ratings is values which must not be exceeded to guarantee device reliability and life,

and when using a device in excess even a moment, it may immediately cause damage to device or may
significantly deteriorate its reliability

●Recommended Operating Condition

Note 1,2,3)

V

Note 4)

V

Note 5)

V

SS

-0.3 14.0 V

DDP

V

IN1

V

IN2

V

IN3

V

IN4

2.7 W

D25

1.45 W

D70

JMAX

-50 125 ºC

STG

=0V.

-0.3 V

SS

-0.3 V

SS

-0.3 V

SS

-0.3 V

SS

+0.3 V

DDP

+1.0 V

REG

+1.0 V

REG

+0.3 V

REG

125 ºC

Item Symbol Min. Typ. Max. Unit

Power Supply Voltage

Note 7)

V

9.0 12.0 13.5 V

DDP

Operating Ambient Temperature Ta -40 25 85 ºC

Speaker Impedance (Stereo) RLS 7.5 8 Ω

Speaker Impedance (Mono) RLM 3.75 4 Ω

Headphone Impedance R

16 32 Ω

LHP

Note 7) All the voltages are measured with respect to VSS=0V.

14

YDA138

●DC Characteristics (VSS=0V, V

=12V±0.5V, Ta=0ºC to 85ºC, unless otherwise specified)

DDP

Item Symbol Min. Typ. Max. Unit

REFA Output terminal voltage V

PROTN terminal Low level output voltage (IOL=1.6mA) V

CKIO terminal High level output voltage (IOH=-80µA) V

CKIO terminal Low level output voltage (IOL=1.6mA) V

SLEEPN, CKIO terminal High level input voltage V

SLEEPN, CKIO terminal Low level input voltage V

Input terminals for control High level input voltage V

Input terminals for control Low level input voltage V

REFA/DVDD terminal Start-up threshold voltage V

REFA/DVDD terminal Cutoff threshold voltage V

PVDDREG terminal start-up threshold voltage V

PVDDREG terminal Cutoff threshold voltage V

4.5 5 5.5 V

REG

0.4 V

OLP

4.0 V

OHC

0.5 V

OLC

2.2 V

IH1

0.8 V

IL1

3.5 V

IH2

1.5 V

IL2

UVAH

UVAL

UVPH

UVPL

3.7 V

3.3 V

8.0 V

7.6 V

Power Supply Fluctuation Cutoff threshold voltage (lower limit) VML VREF*1.8 V

Power Supply Fluctuation Cutoff threshold voltage (upper limit) VMH VREF*2.2 V

Headphone Amplifier limit current I

50 mA

OCHP

●AC characteristics (VSS=0V, V

=12V±0.5V, Ta=0ºC to 85ºC, unless otherwise specified)

DDP

Item Symbol Min. Typ. Max. Unit

Master Clock Frequency (internal clock mode) FCK 500 kHz

Clock Stop Detection Carrier Clock Frequency F

Consumption Current (Sleep mode) I
Consumption Current (Mute mode) I

Consumption Current (Digital amplifier output in no-signal input) I

Consumption Current (Headphone output in no-signal input) I

150 kHz

UFP

1 µA

SLEEP

20 mA

MUTE

40 mA

DDD

10 mA

DDH

Note1) 8Ω resistor and 30µH coil are used as an output load in order to obtain various digital amplifier characteristics.

15

YDA138

●Analog Characteristics (VSS=0V, V

=12V, Ta=25ºC, Frequency:1kHz, unless otherwise specified)

DDP

Digital Amplifier Section

Item Condition Symbol Min. Typ. Max. Unit

Maximum Output (stereo) (THD+N=10%) RL=8Ω 10.0 W

Maximum Output (mono) (THD+N=10%) RL=4Ω

P

O

20.0 W

Voltage Gain (at 1V input sensitivity) AV 18 dB

Total Harmonic Distortion Rate (stereo)

(BW: 20kHz)

Total Harmonic Distortion Rate (mono)

(BW: 20kHz)

Signal /Noise Ratio
(BW: 20kHz A-Filter)

R

=8Ω, PO=1.0W 0.02 %

L

THD+N

R

=4Ω, PO=10W

L

RL=8Ω, PO=10W,

VOL[1:0]=H,H

SNR 103 dB

0.1 %

Channel Separation Ratio VOL[1:0]=H,H CS -70 dB

Maximum Efficiency RL=8Ω, PO=10W η 88 %

Output Offset Voltage Vo ±20 mV

Note) All the values of analog characteristics were obtained by using our evaluation circumstance.

Depending upon parts and pattern layout to use, characteristics may be changed.

8Ω resistor and 30µH coil are used as an output load in order to obtain various digital amplifier characteristics.

Headphone Amplifier Section

Item Condition Symbol Min. Typ. Max. Unit

Maximum Output (THD+N=10%) RL=32Ω P

Total Harmonic Distortion Rate

(BW: 20kHz )

Signal /Noise Ratio

(BW: 20kHz A-Filter )

R

=32Ω, Pho=30mW THD+N

L

RL=32Ω, Pho=20mW,

VOL[1:0]=H,H

50.0 mW

ho

SNR

0.01

95

%

dB

Channel Separation Ratio RL=32Ω, VOL[1:0]=H,H CS -75 dB

16

YDA138

■Typical characteristics examples

●Digital Amplifier Characteristics (V

=12V, RL=8Ω+30µH, Frequency=1kHz, VOL[1:0]=H,H, MODE[2:0]=L,H,L）

DDP

17

YDA138

●Headphone Amplifier Characteristics (V

=12V, RL=32Ω, Frequency=1kHz, VOL[1:0]=H,H, MODE[2:0]=L,H,L)

DDP

18

YDA138

■Package outline

19

YDA138

Notice

The specifications of this product are subject to improvement changes without prior notice.