ANPEC APA2020ARI-TY, APA2020ARI-TU, APA2020ARI-TR, APA2020AKI-TY Datasheet

APA2020A

Stereo 2-W Audio Power Amplifier

Features

••

• Low Supply Current , I

••

• Low Shutdown Current , I

= 8mA at Stereo BTL

DD

= 0.5µA

DD

• Depop Circuitry Integrated

• Low Supply Voltage

• Thermal Shutdown Circuitry Integrated

• Output Power at 1% THD+N , V

- 1.8 W/Ch (typ) into a 4 Ω Load

- 1.2 W/Ch (typ) into a 8 Ω Load

DD

=5V

• Bridge-Tied Load (BTL) or Single-Ended

(SE) Modes Operation

• Various 24-Pin Power Packages Available

SOP , TSSOP-P

• High Supply Voltage Ripple Rejection

Applications

• Stereo Audio Power Amplifier for Notebook

Computer

General Description

The APA2020A is a stereo bridge-tied audio power
amplifier in various 24-pin power packages , includ­ing SOP , TSSOP-P. When connecting to a 5V volt­age supply , the APA2020A is capable of delivering

1.8W/1.2W of continuous RMS power per channel
into 4Ω/8Ω loads with less than 1% THD+N ,
respectively. The APA2020A simplifies design and
frees up board space for other features .

The APA2020A also served well in low-voltage
applications , which provides 800-mW per channel
into 4Ω loads with a 3.3V supply voltage . Both of the
depop circuitry and the thermal shutdown protection
circuitry are integrated in the APA2020A , that reduces
pops and clicks noise during power up and when
using the shutdown or mute modes and protects the
chip from being destroyed by over-temperature
failure.
To simplify the audio system design in notebook
computer applications , the APA2020A combines a
stereo bridge-tied loads (BTL) mode for speaker drive
and a stereo single-end (SE) mode for headphone
drive into a single chip , where both modes are easily
switched by the SE/BTL input control pin signal . For
power sensitive applications , the APA2020A also
features a shutdown function which keeps the supply
current only 0.5 µA (typ) .

Ordering Information

APA2020A

Handling Code

Temp. Range

Package Code

* TSSOP-P is a standard TSSOP package with a thermal pad exposure on the bottom of the package.

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.

Copyright  ANPEC Electronics Corp.
Rev. A.5 - July., 2002

Package Code
K : SOP R : TSSOP-P *

Temp. Range
I: - 40 to 85 C

Handling Code
TU : Tube TR : Tape & Reel
TY : Tray

°

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APA2020A

Block Diagram

MUX

MUX

MUX SE/BTL

Absolute Maximum Ratings

(Over operating free-air temperature range unless otherwise noted.)

Symbol Parameter Rating Unit

V

CC

T

A

T

J

T

STG

T

S

V

ESD

Note: 1. Human body model : C=100pF , R=1500Ω , 3 positive pulses plus 3 negative pulses

2. Machine model : C=200pF , L=0.5mH , R=0Ω , 3 positive pulses plus 3 negative pulses

Supply Voltage 6 V

Operating Ambient Temperature Range -40 to 85
Maximum Junction Temperature 150
Storage Temperature Range -65 to +150
Soldering Temperature,10 seconds 300
Electrostatic Discharge -3000 to 3000

-200 to 200

*1

*2

C

°

C

°

C

°

C

°

V

Copyright  ANPEC Electronics Corp.
Rev. A.5 - July., 2002

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APA2020A

Recommended Operating Conditions

Min. Typ. Max. Unit

Supply Voltage, V

DD

355.5V

VDD=5V, 4-Ω stereo BTL drive,

Operating free-air
temperature, T

A

250mW/Ch average power, with proper PCB
design

-20 85

VDD=5V, 3-Ω stereo BTL drive,

2 W/Ch average power, with proper PCB design

-20 85

and 300 CFM
forced-air cooling

Common mode
input voltage, V

VDD=5 V 1.25 4.5

ICM

VDD=3.3V 1.25 2.7

Electrical Characteristics (Cont.)

AC Operating Characteristics , VDD= 5V , TA= 25°C , RL= 4Ω (unless otherwise noted)

Symbol Parameter Test Condition

P(out) Output power (each channel )

see Note 1

THD = 10% , BTL , RL=4

R

THD = 1% , BTL , RL=4

R

THD = 10% , SE , RL=4

R

THD = 1% , SE , R

R

THD = 0.5% , SE , R

THD + N Total harmonic distortion plus

noise

PO = 1.6W , BTL , RL=4

P

= 1W , BTL , RL=8

O

P

= 78mW , SE ,RL=32

O

L

L

L

=4

L

=8

L

=32

L

=8

=8

=8

Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω

APA2020A

Min. Typ.Max.

2.3

1.5

1.8

1.2

650

400

500

320

90

300

150

20

C

°

V

Unit

W

mW

m%

B

Maximum output power

OM

bandwidth

Phase margin

Copyright  ANPEC Electronics Corp.
Rev. A.5 - July., 2002

= 1V , RL=4

V

1

Ω ,

G = 1

10

G = 10 , THD < 1% >20

RL = 4Ω , BTL

RL = 4Ω , Open Load

R

= 4Ω , SE

L

72

71

52

KHz

°

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APA2020A

Electrical Characteristics (Cont.)

AC Operating Characteristics , VDD= 5V , TA= 25°C , RL= 4Ω (unless otherwise noted)

Symbol Parameter Test Condition

APA2020A

Min. Typ.Max.

PSRR Power supply ripple rejection f =100 Hz 80 dB

Mute attenuation

Channel-to-channel output
separation

Line HP input separation

BTL attenuation in SE mode

ZI Input impedance

Signal-to-noise ratio Po = 500 mW , BTL

Vn Output noise voltage

85 dB

85 dB

75 dB

80 dB

2

90 dB

80

Notes 1 : Output power is meaured at the output teminals of the IC at 1 KHz.

AC Operating Characteristics , VDD= 3.3V , TA= 25°C , RL= 4Ω (unless otherwise noted)

Symbol Parameter Test Condition

P(out) Output power (each channel )

see Note 2

THD = 10% , BTL , RL=4

R

THD = 1% , BTL , RL=4

R

THD = 10% , SE , RL=4

R

THD = 1% , SE , R

R

THD = 0.5% , SE , R

THD + N Total harmonic distortion plus

noise

PO = 1.6W , BTL , RL=4

P

= 1W , BTL , RL=8

O

P

= 78mW , SE ,RL=32

O

L

=8

L

=8

L

=4

L

=8

L

=32

L

=8

Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω

Ω

APA2020A

Min. Typ.Max.

1

0.6

0.8

0.5

290

180

230

140

43

270

150

20

Unit

M

V(rms)

µ

Unit

mW

m%

Ω

W

B

Maximum output power

OM

bandwidth

Phase margin

Copyright  ANPEC Electronics Corp.
Rev. A.5 - July., 2002

= 1V , RL=4

V

1

Ω ,

G = 1

10

G = 10 , THD < 1% >20 KHz

RL = 4Ω , BTL

RL = 4Ω , Open Load

R

= 4Ω , SE

L

92

70

57

°

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APA2020A

)

Electrical Characteristics (Cont.)

AC Operating Characteristics , VDD= 3.3V , TA= 25°C , RL= 4Ω (unless otherwise noted)

Symbol Parameter Test Condition

APA2020A

Min. Typ.Max.

PSRR Power supply ripple rejection f =100 Hz 70 dB

Mute attenuation

Channel-to-channel output
separation

Line HP input separation

BTL attenuation in SE mode

ZI Input impedance

Signal-to-noise ratio Po = 500 mW , BTL

Vn Output noise voltage

f =1 KHz

85 dB

85 dB

75 dB

80 dB

2

90 dB

50

Notes 2 : Output power is meaured at the output teminals of the IC at 1 KHz.

DC Electrical Characteristic , TA=25 °C

APA2020Symbol Parameter Test Conditions

= 5V

V

DD

DD

= 3.3 V

I

DD

Supply Current

Stereo BTL 8 11 mAV
Stereo SE 4 6.5 mA
Stereo BTL 7 9 mA

Typ . Max.

A

Stereo SE 3.5 5.6 mA

V

O (DIFF)

DC Differential Output

=5V, Gain = 2, see Note3 5 25 mV

V

DD

Voltage

I

DD(MUTE

I

SD

Supply Current in Mute Mode V
IDD in Shutdown V

= 5V 8 11 mA

DD

= 5V 0.5 5

DD

Unit

M

V(rms)

µ

Unit

µ

Ω

A

Note 3 : at 3V<VDD<5V , the DC output voltage is approximately V

Copyright  ANPEC Electronics Corp.
Rev. A.5 - July., 2002

DD

/ 2.

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APA2020A

Pin Description

GND/HS

LOUT+

LLINEIN

LHPIN

LBYPASS

LV

SHUTDOWN

MUTE OUT

LOUT-

MUTE IN

GND/HS

T

J

DD

1

2

3
4

5

6
7

8

9

10
11
12

Top View

For SOP and TSSOP-P

Pin

Name No

GND/HS 1,12,

13,24

TJ 2 O

24

23
22
21

20
19

18

17

16

15
14
13

GND/HS

NC
ROUT+

RLINEIN

RHPIN

RBYPASS
RV

DD

NC

HP/LINE
ROUT-

SE/BTL
GND/HS

Thermal

Pad

Bottom View

For TSSOP-P Only

I/O

Description

Ground connection for circuitry, directly connected to thermal pad
(only in TSSOP-P package).

Shutdown mode control signal input, sources a current proportional
to the junction temperature. This pin should be left unconnected
during normal operation. For more information, see the junction
temperature measurement section of this document.

LOUT + 3 O Left channel + output in BTL mode, + output in SE mode.

L LINE IN 4 I

LHP IN

5I

Left channel line input, selected when HP/

pin (16) is held low.

LINE

Left channel headphone input, selected when HP/

LINE

pin (16) is

held high.

LBYPASS 6 Connect to voltage divider for left channel internal mid-supply bias.

LV

DD

7 I Supply voltage input for left channel and for primary bias circuits.

SHUTDOWN 8 I Shutdown mode control signal input, places entire IC in shutdown

mode when held high, I

= 0.5µA.

DD

MUTE OUT 9 O Follows MUTE in pin (11), provides buffered output.

LOUT - 10 O Left channel - output in BTL mode, high-impedance state in SE

mode.

MUTE IN 11 I

Mute control signal input, hold low for normal operation, hold high to
mute.

SE/BTL

14 I Mode control signal input, hold low for BTL mode, hold high for SE

mode.

ROUT- 15 O

Right channel - output in BTL mode, high impedance state in SE
mode.

HP/

LINE

16 I MUX control input, hold high to select headphone inputs (5,20),

hold low to select line inputs (4,21).

Copyright  ANPEC Electronics Corp.
Rev. A.5 - July., 2002

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APA2020A

Pin Description (Cont.)

Pin

Name No

I/O

Description

NC 17,23 No internal connection.

RV

DD

RBYPASS 19

18 I Supply voltage input for right channel.

Connect to voltage divider for right channel internal mild-supply
bias.

RHP IN 20 I

Right channel headphone input, selected when HP/
held high.

RLINE IN 21 I

Right channel line input, selected when HP/

pin (16) is held

LINE

low.

ROUT+ 22 O Right channel + output in BTL mode, + output in SE mode.

Test Information

R

F

CIR

I

4.7µFC

B

MUX

SE/BTL

HP/LINE

RL=4 Ω , 8Ω or

32 Ω

CIR

4.7µF

R

F

MUX

I

C

B

SE/BTL

HP/LINE

LINE

V

pin (16) is

C

O

RL= 4
or 32

DD

Ω , 8 Ω

Ω

Figure 2. BTL Test Circuit

Copyright  ANPEC Electronics Corp.
Rev. A.5 - July., 2002

Figure 3. SE Test Circuit

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APA2020A

Typical Characteristics

10

VDD=5V

5

f=1 KHz

BTL

2

1

%

0.5

0.2

0.1

0.06

0 3500m 1 1.5 2 2.5

THD+N- Total Harmonic Distortion + Noise

Po - Output Power

RL=8

ΩΩ

Ω

ΩΩ

W

RL=3

ΩΩ

Ω

ΩΩ

Figure 4

10

VDD=5V

5

PO=1.5W

ΩΩ

RL=4

Ω

ΩΩ

BTL

2

AV=20

1

%

0.5

0.2

0.1

0.06

20 20k50 100 200 500 1k 2k 5k

THD+N- Total Harmonic Distortion + Noise

AV=10 AV=2

AV=2

PO=1.8W, RL=3

Hz

f - Frequency

Ω

Figure 5

10

VDD=5V

5

AV=2

ΩΩ

RL=4

Ω

2

1

%

0.5

0.2

0.1

0.06

THD+N- Total Harmonic Distortion + Noise

ΩΩ

BTL

PO=1.8W, RL=3

20 20k50 100 200 500 1k 2k 5k

Ω

PO=0.75W PO=1.5W

Hz

PO=0.25W

f - Frequency

Figure 6

10

VDD=5V

5

RL=3

ΩΩ

Ω

ΩΩ

BTL

2

1

%

0.5

0.2

0.1

0.06

100m 10200m 500m 1 2 5

THD+N- Total Harmonic Distortion + Noise

f=20KHz

f=20Hzf=1KHz

W

Po - Output Power

Figure 7

Copyright  ANPEC Electronics Corp.
Rev. A.5 - July., 2002

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8