HM2012 [HMSEMI]

2.1W/ch Stereo Filter-free Class-D Audio Power Amplifier;


型号：	HM2012
厂家：	H&M Semiconductor
描述：	2.1W/ch Stereo Filter-free Class-D Audio Power Amplifier
文件：	总7页 (文件大小：548K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

HM2012

2.1W/ch Stereo Filter-free Class-D Audio Power Amplifier

General Description

Personal Digital Assistant(PDA)

Portable gaming device

Powered speakers

The HM2012 is a 2.1W/ch stereo high efficiency

filter-free class-D audio power amplifier. The HM2012

can operate from 2.7 to 5.5V supply. When powered

with 5V voltage, the HM2012 can deliver 2.1W per

channel to dual 4Ω load at 10% THD+N, and also

capable of driving 1.5W/ch to dual 8Ω load. The

HM2012 is thermally limited in WCSP and may not

achieve 2.1W/ch for 4Ω.

Notebook computer

Features

Output power

– 2.1W/ch into 4Ω at 5V

– 1.5W/ch into 8Ω at 5V

As a Class D audio power amplifier, the HM2012

supports 90% high efficiency and -75dB PSRR at

217Hz which make the device ideal for

battery-supplied, high quality audio applications.

The HM2012 features independent shutdown controls

for each channel. The gain can be selected to 6, 12,

18, or 24 dB utilizing the G0 and G1 gain select pins.

The HM2012 also features the minimized

click-and-pop noise during the turn-on and

shutdown.

– 750mW/ch into 8Ω at 3.6V

PSRR: -75dB (typical)

CMRR: -70dB (typical)

Efficiency up to 90%

Only two external components required

Independent shutdown control for each channel

Short-circuit and thermal protection

Shutdown current: 1.0μA (typical)

Power supply range: 2.7V to 5.5V)

Packaging

The HM2012 is manufactured in space-saving QFN-20

(4mm x 4mm) and WCSP-16 (2mm x 2mm) package

Applications

QFN-20 (4mm x 4mm)

WCSP-16 (2mm x 2mm)

Applications

Mobile phone

Pin Out Diagram

Figure1. QFN 20 Top View

Figure2. WCSP 16 Top View

HM2012

Ordering Information

P/N

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

20 pin QFN

HM2012Q

HM2012W

16 ball WCSP

Note: The HM2012 is thermally limited in WCSP and may not achieve 2.1W/ch for 4Ω.

Absolute Maximum Ratings

Supply Voltage (V_DD) in active mode

Supply Voltage (V_DD) in shutdown mode

Input Voltage (V_I)

-0.3 V to 5.5V

-0.3 V to 6.0V

-0.3V to V_DD+0.3V

-40°C to 85°C

Operating Free-air Temperature range (T_A)

Operating Junction Temperature range (T_J) -40°C to +125°C

Storage Temperature (T_STG) range

-65°C to +150°C

Operation Ratings

Supply Voltage (V_DD)

2.7V to 5.5V

High Level Input Voltage (V_IH)

Low Level Input Voltage (V_IL)

Operating Temperature (T_A)

1.3V to VDD

0 to 0.35V

-40°C to +85°C

Electrical Characteristics

T_A=25°C

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

Output offset voltage (measured Inputs ac grounded, A_V=6dB,

∣V_OO

∣

differentially)

V_DD=2.7V to 5.5V

PSRR

CMRR

Power supply rejection ratio

Common mode rejection ratio

V_DD=2.7V to 5.5V

-75

-70

-55

-50

Inputs shouted together,

_DD=2.7V to 5.5V

_DD=5.5V, V_I= V_DD

_DD=5.5V, V_I=-0V

∣I_IH∣

∣I_IL∣

High-level input current

Low-level input current

μA

V_DD=5.5V, no load or output filter

_DD=3.6V, no load or output filter

On-state V_DD=5.5V

_DD=3.6V

Output impedance in SHUTDOWN V_(SHOUTDOWN)=0.35V

7.5

5.5

420

520

I_DD

Supply current

Static

Drain-source

r_DS(ON)

mΩ

Resistance

kΩ

f_(SW)

Switching frequency

V_DD=2.7V to 5.5V

G0, G1=0.35V

250

5.5

300

350

6.5

kHZ

G0= V_DD, G1=0.35V

G0=0.35V, G1= V_DD

G0, G1= V_DD

11.5

17.5

23.5

12.5

18.5

24.5

Closed-loop voltage gain

HM2012

Operating Characteristics

T_A=25°C, R_L=8Ω

Symbol

Parameter

Test Conditions

Min

Typ

2.1

Max

Unit

THD+N=10%, f=1kHz, R_L=4Ω

V_DD=5V

Output

channel)

power

(per

P_O

V_DD=5V

1.5

THD+N=10%, f=1kHz, R_L=8Ω

V_DD=3.6V

0.75

0.14%

0.10%

-85

Total harmonic distortion V_DD=5V, P_O=1W, A_V=6dB, f=1kHz

THD+N

plus noise

_DD=5V, P_O=0.5W, A_V=6dB, f=1kHz

Channel crosstalk

f=1KHz

μV

Supply ripple rejection V_DD=5V, A_V=6dB, f=217Hz

-75

k_SVR

ratio

_DD=3.6V, A_V=6dB, f=217Hz

_DD=3.6V, f=20 to 20KHz, No weighting

-70

Output voltage noise

Inputs ac-grounded, A_V=6dB

A weighting

Common mode rejection

ratio

CMRR

V_DD=3.6V, V_IC=1V_pp

f=217Hz

-70

A_V=6dB

28.1

17.3

9.8

kΩ

A_V=12dB

A_V=18dB

A_V=24dB

Z_I

Input impedance

5.2

Start-up

time

from

V_DD=3.6V

3.5

shutdown

Block Diagram

Figure3. Block Diagram

HM2012

Terminal Functions

Terminal

I/O

Description

Name

INR+

QFN

WCSP

Right channel positive input

Right channel negative input

Left channel positive input

Left channel negative input

INR-

INL+

INL-

SDR

Right channel shutdown terminal (active low)

Left channel shutdown terminal (active low)

Gain select (LSB)

SDL

Gain select (MSB)

PV_DD

3,13

Power supply (Must be same voltage as AV_DD)

AV_DD

Analog supply (Must be same voltage as PV_DD

)

PGND

AGND

OUTR+

OUTR-

OUTL+

OUTL-

4,12

Power ground

Right channel positive differential output

Right channel negative differential output

Left channel positive differential output

Left channel negative differential output

No internal connection

6,10

N/A

Thermal Pad

Connect the thermal pad of QFN or PWP package to PCB GND

Application Information

Figure4. Single-ended Input

Figure5. Differential Input

HM2012

If the corner frequency is within the audio band, the

capacitors should have a tolerance of ±10% or

better, because any mismatch in capacitance

causes an impedance mismatch at the corner

frequency and below.

Decoupling Capacitor (C_S)

The HM2012 is a high-performance Class-D audio

amplifier that requires adequate power supply

decoupling to ensure the efficiency is high and total

harmonic distortion (THD) is low. For higher

frequency transients, spikes, or digital hash on the

line a good low equivalent-series-resistance (ESR)

ceramic capacitor, typically 1µF, placed as close as

possible to the device PV_DDlead works best. Placing

this decoupling capacitor close to the HM2012 is

important for the efficiency of the Class-D amplifier,

because any resistance or inductance in the trace

between the device and the capacitor can cause a

loss in efficiency. For filtering lower-frequency noise

signals, a 4.7µF or greater capacitor placed near the

audio power amplifier would also help, but it is not

required in most applications because of the high

PSRR of this device.

Operation with DACs and CODECs

In using Class-D amplifiers with CODECs and DACs,

sometimes there is an increase in the output noise

floor from the audio amplifier. This occurs when

mixing of the output frequencies of the CODEC/DAC

mix with the switching frequencies of the audio

amplifier input stage. The noise increase can be

solved by placing a low-pass filter between the

CODEC/DAC and audio amplifier. This filters off the

high frequencies that cause the problem and allow

proper performance.

Filter Free Operation and Ferrite Bead

Filters

Audio Amplifier Gain Setting

The HM2012 features four internally configured gain

settings. The device gain is selected through the two

gain select pins, G0 and G1. The gain settings are

shown in the following table.

A ferrite bead filter can often be used if the design is

failing radiated emissions without an LC filter and

the frequency sensitive circuit is greater than 1MHz.

This filter functions well for circuits that just have to

pass FCC and CE because FCC and CE only test

radiated emissions greater than 30MHz. When

choosing a ferrite bead, choose one with high

impedance at high frequencies, and very low

impedance at low frequencies. In addition, select a

ferrite bead with adequate current rating to prevent

distortion of the output signal.

Gain (V/V)

Gain (dB)

R_I(KΩ)

28.1

17.3

9.8

5.2

Gain Setting Table

Input Capacitors (C_I)

Use an LC output filter if there are low frequency

(<1MHz) EMI sensitive circuits and/or there are long

leads from amplifier to speaker.

The input capacitors and input resistors form a

high-pass filter with the corner frequency, fC,

determined in Equation 1.

Figure 6 shows typical ferrite bead and LC output

filters.

(1)

(2πR

C )

The value of the input capacitor is important to

consider as it directly affects the bass (low

frequency) performance of the circuit. Speakers in

wireless phones cannot usually respond well to low

frequencies, so the corner frequency can be set to

block low frequencies in this application. Not using

input capacitors can increase output offset.

Figure6. Typical ferrite chip bead filter

Equation 2 is used to solve for the input coupling

capacitance.

(2)

(2πR f )

HM2012

Mechanical Data

WCSP-16

HM2012

QFN-20

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