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PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

1.25 Watt Fully Differential Audio Power Amplifier with Internal Feedback Resistors 1 FEATURES
Fully differential amplifier Improved PSRR at 217Hz(VDD>3.0V) Power output at 5.0V & 1% THD Power output at 3.6V & 1% THD Ultra low shutdown current turn-off transitions Thermal overload protection circuitry No output coupling capacitors, bootstrap capacitors required Unity-gain stable External gain configuration capability Available in space-saving packages: 9-bump micro SMD and 8-pin SOP8 86dB (typ) 1.25W (typ) 0.6W (typ) 0.01?A (typ)

Improved pop & click circuitry eliminates noises during turn-on and

2

GENERAL DESCRIPTION
The PJA6211 is a fully differential audio power amplifier designed for portable communication device applications. It is capable of delivering 1.25 watt of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a 5V battery voltage. It operates from 2.2 to 5.5V. Features like 86dB PSRR at 217Hz, improved RF-rectification immunity, the space-saving 8-pin MSOP8 and 9-bump micro SMD package, the advanced pop & click circuitry, a minimal count of external components and low-power shutdown mode make PJA6211 ideal for wireless handsets. The PJA6211 is unity-gain stable, and the gain can be configured by external input resistors and internal feedback resistors.

3

APPLICATIONS
Wireless handsets Portable audio devices PDAs, Notebook computers

Page 1 of 17

PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

4

TYPICAL APPLICATION

CS 1μF VDD 0.39μF Ci
Differential Audio Input

Rf 40kΩ

20kΩ Ri

IN-

VIH VIL C B 1μF C B is optional Ci 0.39μF Ri 20kΩ GND SHUTDOWN Bias VDD/2 Circuitry VO1

BYPASS

+ CP2296 PJA6211 VO2

RL 8Ω

+
IN+ 40kΩ Rf

Figure 1 Typical Audio Amplifier Application Circuit

5

ORDER INFORMATION
Table 1. Ooder information

Part Number PJA6211ITLX PJA6211GITLX PJA6211MM PJA6211GMM

Marking AA AAG AB ABG

Package 9 Bump micro SMD 9 Bump micro SMD(Lead-Free) 8-Pin MSOP8 8-Pin MSOP8(Lead-Free)

Shipping 3000 pcs / Tape&Reel 3000 pcs / Tape&Reel 3000 pcs / Tape&Reel 3000 pcs / Tape&Reel

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PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

6.1 PIN DIAGRAM (TOP VIEW)
9 Bump micro SMD Package (Top View) 9 Bump micro SMD Marking

3

IN+

VDD SHUTDOWN

2

VO1

GND

VO2

1

EG AA
E- Die Run Trace ability E - Die Run Traceability G- Date Code G - Date Code AA-PJA6211ITLX

IN-

GND

BYPASS

A

B

C

AA - CP2296ITLX

Mini Small Outline (MSOP8) Package (Top View)
SHUTDOWN BYPASS IN+ IN1 2 3 4 8 7 6 5 VO2 GND VDD VO1

MSOP8 Marking

EG AB
E- Die Run Trace ability

EG-Die Run Traceability - Date Code GAB-PJA6211MM - Date Code AB - CP2296MM

Figure 2

Pin Diagram of PJA6211

6.2 Pin Definitions and Functions
Table 2. Pin Definitions and functions MSOP8 1 2 9-Bump micro SMD C3 C1 Symbol SHUTDOWN BYPASS Type I I Functions Shutdown Pin, active low. Common mode voltage. Connect a bypass capacitor to GND for common mode voltage filtering. Positive differential input. Negative differential input Positive differential output Power supply Ground Negative differential output

3 4 5 6 7 8

A3 A1 A2 B3 B1,B2 C2

IN+ INVO1 VDD GND VO2

I I O I I O

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PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

7 OPERATION CONDITIONS AND ELECTRICAL CHARACTERISTICS
7.1 Absolute Maximum Ratings(note 1)
Supply voltage,VDD……………………………………..-0.3V to 6.0V Input voltage…………………………………………….-0.3V to VDD +0.3V Storage Temperature……………………………………-65℃ to 150℃ Power Dissipation(note 2)………………………………..Interally Limited ESD Parameters: ESD Protection(HBM,1.5Ω and 100pF in series)……………………2000V ESD Protection(MM,200pF,no resister)………………………………200V Junction temperature, TJ………………………………………..-40℃ to 150℃ Thermal Resistance θJA(micro SMD)…………………………220℃/W Thermal Resistance θJC(MSOP)……………………………....56℃/W Thermal Resistance θJA(MSOP)………………………………190℃/W Lead Temperature(Soldering,10sec)……………………………300℃

Note1:stresses beyond those listed under”absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under”recommended operating conditions”isn’t implied. Exposure to absolute maximum rated coditions for extended periods may affect device reliability. Note2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, And the ambient temperature TA. The maximun allowable power dissipation is PDMAX=(TJMAX-TA)/ θJAor the mumber given in Absolute Maximum Ratings,whichever is lower.

7.2 Operation Conditions
Parameter Power Supply Voltage Operating Temperature Range Table3. Symbol VDD TA Operation Conditions Min Typ 2.2 -40 Max 5.5 85 Unit V ℃

Page 4 of 17

PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

7.3 Electrical Characteristics
Table 4. VDD=5V(The following specifications apply for 8Ωload, AV=1V/V,TA=25℃,unless otherwise specified.) Parameter Quiesscent Power Supply Current Shutdown Current Output Power Total Harmonic Distortion+Noise Power Supply Rejection Ratio Common Mode Rejection Ration Output Offset Shutdown Voltage Input Hight Shutdown Voltage Input Low Closed Loop Gain Symbol IDD ISD PO THD+N Conditions VIN=0V,no load VIN=0V,RL=8Ω VSHUTDOWN=GND THD=1%(max); f=1kHz PO=0.6Wrms; f=1kHz Vripple=200mV sine p-p f=217Hz(note1) f=1kHz(note1) f=217Hz(note2) f=1kHz(note2) F=217Hz VCM=200mVPP VIN=0V 1.5 0.5 Min Typ 2.5 4 0.01 1.25 0.02 -88 -83 -83 -83 -78 2 8 Max 5 8 1 Unit mA uA W %

PSRR

dB

CMRR VOS VSDIH VSDIL AV

dB mV V V V/V

36k? Ri

40k? Ri

44k? Ri

Note1:Unterminated input Note2:10Ωterminated imput

Table 5.

VDD=3.6V(The following specifications apply for 8Ωload, AV=1V/V,TA=25℃ ,unless oterwise specified.) Symbol IDD ISD PO THD+N Conditions VIN=0V,no load VIN=0V,RL=8Ω VSHUTDOWN=GND THD=1%(max); f=1kHz PO=0.4Wrms; f=1kHz Vripple=200mV sine p-p f=217Hz(note1) f=1kHz(note1) f=217Hz(note2) f=1kHz(note2) F=217Hz VCM=200mVPP VIN=0V 1.5 0.5 Min Typ 2 3.5 0.01 0.6 0.02 -86 -83 -83 -83 -76 2 8 Max 4.5 7.5 1 Unit mA uA W %

Parameter Quiesscent Power Supply Current Shutdown Current Output Power Total Harmonic Distortion+Noise Power Supply Rejection Ratio Common Mode Rejection Ratio Output Offset Shutdown Voltage Input Hight Shutdown Voltage Input Low Closed Loop Gain

PSRR

dB

CMRR VOS VSDIH VSDIL Gain

dB mV V V V/V

36k? Ri

40k? Ri

44k? Ri

Note1:Unterminated input Note2:10Ω terminated input
Page 5 of 17

PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

8 TYPICAL CHARACTERISTICS

Page 6 of 17

PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

Page 7 of 17

PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

Page 8 of 17

PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

Page 9 of 17

PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

9 APPLICATION INFORMATION
9.1 Fully Differential Amplifier Description
The PJA6211 is a fully differential amplifier with differential inputs and outputs. The fully differential amplifier consists of differential amplifier and a common mode amplifier. The differential amplifier ensures that the amplifier outputs a differential voltage that is equal to the differential input times the gain. The common mode feedback ensures that the common-mode voltage at the output is biased around VDD/2 regardless of the common-mode voltage at the input. The PJA6211 provides a “bridged mode” output configuration ( bridge-tied-load,BTL). This means the output signals at Vo+ and Vo- that are 180°out of phase with respect to each other. Bridged mode peration is different from the single-ended output configuration that connects the load between the amplifier output and ground. A bridged amplifier design has distinct advantages over the single-ended output configuration:it provides differential drive to the load, thus doubling maximum possible output swing for a specific supply voltage. Four times the output power is possible compared with a single-ended output configuration under the same conditions. This increase in attainable output power assumes that the amplifier is not current limited or clipped.

9.2 Advantages of Fully Differential Amplifier
Input and output coupling capacitor not required:A fully differential amlifier with good CMRR,the PJA6211 allows the input signal to be biased at voltage other than mid-supply of the PJA6211, the common-mode feedback circuit adjusts for it ,and the output are still biased at mid-suply of the PJA6211. Mid-supply bypass capacitor, CBYPASS not required:The fully differential amplifier does not require a bypass capactior. It is because any shift in the mid-supply affects both positive and negative channels equally and cancels the differential output. However, removing the bypass capacitor slightly worsens power supply rejection ration, but a slightly decrease of PSRR may be acceptable when an additional component can be eliminaated. Better RF-immunity:GSM handsets save power by turning on and shutting off the RF transmitter at a rate of 217Hz. The transmitted signal is picked-up on input and output traces. The fully differential amplifier reduces the RF rectification much better than the typical audio amplifier.

Page 10 of 17

PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

9.3 Applications
From Figure 3 to Figure 5 show application shcematics for differential and single-ended inputs.

PJA6211

Figure 3

Typical Differntail Input Application

Page 11 of 17

PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

PJA6211

Figure 4

Differntail Input Application With Input Capacitors

PJA6211

Figure 5

Single-Ended Input Application

Page 12 of 17

PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

9.4 Proper Selection of external Components 9.4.1 Input Resistor(Ri) Gain=40kΩ/Ri (1)

The input(Ri) and internal feedback resistors Rf=40kΩ, set the gain of the amplifier according to Equation 1: In order to optimize the THD+N and SNR performance, the PJA6211 should be used in low closed-loop gain configuration. Rf and Ri should be in range from 1kΩ to 100kΩ. Resistor matching is very important for fully differential amplifiers. The balance of the output on the common mode voltage depends on matched ratios of the resistors. CMRR,PSRR,and the second haromonic distortion is increased if resistor not matched. Therefore, it is recommended to usd1% tolerance or better resistors to keep the performance optimized.

9.4.2

Input Capacitor(Ci)

The input coupling capacitor blocks the input DC voltage. The PJA6211 does not require input coupling capacitors if using a differential input source that is biased from 0.5V to VDD-0.8. use 1% tolerance or better resistors if not using input coupling capacitors. In the sigle-ended inut application an input capacitor, Ci, is required to bias the input signal to the proper dc level. The Ci and Ri form a high-pass filter with the corner frequency determined in Equation 2.

fc =

1 2πRiCi

(2)

Special care should be taken to the value of Ci because it directly affects the low frequency performance of the system. For example. Assuming Ri is 20kΩ and the specification calls for a flat response down to 100Hz. From Equation 2, Ci is 0.08uF, so Ci would likely choose a value in the range of 0.068uF to 0.47uF.A further consideraion for Ci is the leakage path from the inut source through the input network (Ri,Ci) and the feedback resistor(Rf) to the load. This leakage current creates a DC offset voltage that reduces useful headroom, especially in high gain aplications.For this reason, a ceramic capacitor is the best choice.

9.4.3

Bypass Capacitor(CBYPASS)and start-up Time

Connecting a capacitor to BYPASS pin filters any noise into this pin and increases the PSRR performance. CBYPASS also determines the rise time of VO+ and VO-, the larger the capacitor, the slower the rise time, the PJA6211 starts to work after the CBYPASS Voltage reaches the mid-supply voltage. This capacitor can also minimize the pop & click noise, 1uF capacitor is recommended for CBYPASS
Page 13 of 17

PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

9.4.4

Decoupling Capacitor(CS)

Power supply decoupling is critical for low THD+N and high PSRR performance. A low equivalent-series-resistance(ESR)ceramic capacitor,typically 0.1uF to 1uF, placed as close as possible to VDD pin make the device work better. For filtering lower frequency noise signals, a 10uF or Greater capacitor placed near the audio power amplifier also helps, but it is not required in most applications because of the high PSRR of this device.

9.5 USING LOW-ESR CAPACITORS
Low-ESR capacitors are recommedned . A real capacitor can be modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this resistor minimizes the beneficial effects of the capacitor in the circuit.the lower the equivalent value of this resistance the more the real capacitor behaves like an ideal capacitor.

9.6 POWER DISSIPATION
Power dissipation is a major concern when designing a successful amplifier, whether the amlifier is bridged or single-ended. Equation 3 states the maximum power dissipation point for a single-ended amplifier operating at a given supply voltage and driving a speacified output load.

However, a direct consequence of the increased power delivered to the load by a bridge amplifier is an increase in internal power dissipation versus a single-ended amplifier operating at the same conditions.

Since the PJA6211 has bridged outputs ,the maximum internal power dissipation is 4 times that of a single-ended amplifier. Even with this substantial increasing in power dissipation, the PJA6211 does not require additional heat-sinking under most operationg conditions and output loading. From Equation 4, assuming a 5V power supply and an 8Ω load, the maximum power dissipation point is 625mW.The maximum power dissipation point obtained from Equation 4 must not be greater than the power dissipation results form Equation 5:

Depending on the ambient temperature, TA, of the system surroundings, Equation 5 can be used to find the maximum internal power dissipation supported by the IC packaging. If the result of Equation 4 is greater than that of Equation 5, then either the supply volatge must be decreased , the load impedance incrased , the ambient temperatures reduced, of the

θJA reduced with heat-sinking. In many cases, larger traces near the output, VDD,

and GND pins can be used to lower theθJA . the larger areas of copper provide a form of heat-sinking allowing highter power dissipation, Recall that internal power dissipation is a function of output power. If the typical operation is not around the maximum power dissipation point, the PJA6211 can operate at higher ambient temperatures.

Page 14 of 17

PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

9.7 SHUTDOWN FUNCTION
In order to reduce power consumption while not in use , the PJA6211 contains shutdown circuitry that is used to turn off the amplifier’s bias circuitry. The shutdown pin should be tied to a definite voltage to avoid unwanted state changes . In many applications, a microcontroller or microprocessor output is used to control the shutdown circuitry, which provides a quick, smooth transition to shutdown. Another solution is to use a single-throw switch in conjunction with an extrnal pull-down resistor. This scheme grarantees that the shutdown pin will not float, thus preventing unwanted state changes.

9.8 PCB LAYOUT
The residual resistance of the PCB trace between the amplifier output pins and the speaker causes a voltage drop, which results in power dissipated in the PCB trace and not in the speaker as desired. Therefore, to maintain the highest speaker power dissipation and widest output voltage swing, PCB trace that connects the amplifier output pins to the speaker must be as wide as possible. Poor power supply regulation adversely affects maximum output power.A poorly regulated supply’s output voltage decreases with increasing load current, Reduced supply voltage causes decreased headroom, output signal clipping, and reduced output power. Even with tightly regulated supplies , power supply trace resistance creates the same effects as poor supply regulation. Therefore, making the power supply trace as wides as possible helps to maintain full output voltage swing. It is very inportant to keep the PJA6211 external components very close to the PJA6211 to limit noise pickup

Page 15 of 17

PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

10 PHYSICAL DIMENSIONS

9-Bump micro SMD Part Number PJA6211ITLX X1=1.514±0.03 X2=1.514±0.03 X3=0.6000±0.075

PHYSICAL DIMENSIONS(continued)

Page 16 of 17

PJA6211 Datasheet v1.0
1.25 Watt Fully Differential Audio Power Amplifier withInternal Feedback Resistors

Mini small Outline(MSOP8) Part Number PJA6211MM

Page 17 of 17


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