View EUA5544DIR1_4129171.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

EUA5544 Class AB Stereo Headphone Driver with Shutdown
DESCRIPTION
The EUA5544 is pin compatible with the BH3541/4, and functionally compatible with the TPA611N series and LM488 N series. As the EUA5544 contains advanced depop circuitry which eliminates pops & clicks during shutdown-on and shutdown-off, it can reduces a capacitor and resistor compared to Mute solution of other devices. The EUA5544 features an advantage of low-power consumption shutdown mode, activated by driving the shutdown pin with logic low. And it also allows fast turn-on with 1F bypass capacitor (CB). The EUA5544 is an integrated class AB stereo headphone amplifier capable of delivering 68mW per channel of continuous average power into a 16 load or 35mW per channel into a 32 load from a 5V power supply. It also can operate from a 3V supply, capable of delivering 24 mW into a 32 load. The EUA5544 further integrates a voltage divider inside the chip. Thus, the external resistors can be eliminated. The EUA5544 has a fixed gain of 6dB so that external gain setting is unnecessary.
FEATURES
No Switch On/Off Clicks Wide Power Supply Operation 2.5V- 6V Mute Function Compatibility High Signal-to-Noise Ratio Low Distortion Large Output Voltage Swing Excellent Power Supply Ripple Rejection High Crosstalk ImmunityO Low Quiescent Current Ultra-low Shutdown Current ...0.02A typical Short-circuit Protection Integrated Voltage Divider (VDD/2) to Eliminate External Resistors Available in SOP-8 RoHS Compliant and 100% Lead (Pb)-Free 85dB
APPLICATIONS
Headphone Amplifier for CD-ROMs Portable Audio Equipment
Typical Application Circuit
DS5544 Ver 2.4 Oct.2007
1
EUA5544
Pin Configurations
Package Type Pin Configurations
EUA5544 (Plastic SOP-8)
Pin Description
PIN OUTA Shutdown INA VSS INB BIAS OUTB VDD I I O I/O O I I A channel output pin Chip disable control input, low active and high for normal operating A channel input terminal Power ground pin B channel input terminal Right channel bias input pin B channel output pin Power input pin DESCRIPTION
Block Diagram
DS5544 Ver 2.4 Oct.2007
2
EUA5544
Ordering Information
Order Number EUA5544DIR1 Package Type SOP-8 Marking xxxxx EUA5544 Operating Temperature range -40 C to 85C
EUA5544
1/4
1/4
1/4
1/4 Lead Free Code 1: Lead Free 0: Lead Packing R: Tape& Reel Operating temperature range I: Industry Standard Package Type D: SOP
DS5544 Ver 2.4 Oct.2007
3
EUA5544
Absolute Maximum Ratings
u u
u
u
u
u
Input voltage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Maximum Junction Temperature - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Storage Temperature Range - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Power Dissipation PD@)TA=25 C SOP-8 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Package Thermal Resistance SOP-8, c jA - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Electrostatic Discharge - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
7V 150C -60C to150C 0.625W 160C /W -3000 to 3000V(1) -200 to 200V(2)
Notes: (1) Human body mode: C=100pF, R=1500, 3 positive pulses plus 3 negative pulses (2) Machine mode: C=200pF, L=0.5mH, R=0, 3 positive pulses plus 3 negative pulses
Electrical Characteristics VDD = 5V
Vin = -6dBV, RL = 32, f = 1KHz, CB = 1F, TA = 25C (unless otherwise specified)
Symbol
VDD IQ ISD VSDIH VSDIL GVCL GVCL THD+N Po VN CS ATT PSRR
Parameter
Supply Voltage Quiescent Current Shutdown Current Shutdown Voltage Input High Shutdown Voltage Input Low Differential Channel Voltage Gain Voltage Gain Total Harmonic Distortion plus Noise Output Power Output Noise Voltage Channel Separation Shutdown Attenuation Ripple Rejection
Conditions
Vin = 0V VSD = GND
Min.
2.5
EUA5544 Typ. Max.
5.0 3.5 0.02 1.8 0.4 6.0 5
Unit
V mA A V V
-0.5 4 BW < 80KHz RL = 32, THD+NO 0.1%, BWO 80KHz RL = 16, THD+NO 0.1%, BWO 80KHz BW = 20~20KHz f = 20~20KHz Vin = 1V, SD = Low FRR=100Hz, VRR= -20dBV 55
0 6 0.02 31 62 -95 90 70 60
0.5 8 0.1
dB dB % mW mW dBV dB dB dB
DS5544 Ver 2.4 Oct.2007
4
EUA5544
Electrical Characteristics VDD = 3.0V
Vin = -6dBV, RL = 32, f = 1KHz, CB = 1F, TA = 25C (unless otherwise specified)
Symbol
IQ ISD Po VN PSRR
Parameter
Quiescent Current Shutdown Current Output Power Output Noise Voltage Ripple Rejection
Conditions
Vin = 0V VSD = GND RL = 32, THD+NO 0.1%, BWO 80KHz RL = 16, THD+NO 0.1%, BWO 80KHz BW = 20a 20KHz
EUA5544 Min. Typ. Max.
2.4 0.02 24 37 -95 55 -94 60 3
Unit
mA A mW mW dBV dB
FRR=100Hz, VRR= -20dBV
Electrical Characteristics VDD = 2.5V
Vin = -6dBV, RL = 32, f = 1KHz, CB = 1uF, TA = 25C (unless otherwise specified)
Symbol
IQ ISD Po VN PSRR
Parameter
Quiescent Current Shutdown Current Output Power Output Noise Voltage Ripple Rejection
Conditions
Vin = 0V VSD = GND RL = 32, THD+NO 0.1%, BWO 80KHz RL = 16, THD+NO 0.1%, BWO 80KHz BW = 20~20KHz FRR=100Hz, VRR= -20dBV
EUA5544 Min. Typ. Max.
2.2 0.02 17 22 -94 60 3
Unit
mA A mW mW dBV dB
DS5544 Ver 2.4 Oct.2007
5
EUA5544
Typical Operating Characteristics
DS5544 Ver 2.4 Oct.2007
6
EUA5544
DS5544 Ver 2.4 Oct.2007
7
EUA5544
DS5544 Ver 2.4 Oct.2007
8
EUA5544
Application Note
Power Supply Decoupling, CS EUA5544 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also prevents the oscillations causing by long lead length between the amplifier and the speaker. Applications that employ a 5V regulator typically use a 10F in parallel with a 0.1F filter capacitors to stabilize the regulator's output, reduce noise on the supply line, and improve the supply's transient response. However, this does not eliminate the need for a local bypass capacitor connected between the EUA5544's supply pins and ground. A bypass capacitor value in the range of 0.1F to 1F is recommended for CS. Input Capacitor Ci Amplifying the lowest audio frequencies requires a high value input coupling capacitor, Ci. A high value capacitor can be expensive and may compromise space efficiency in portable designs. In many cases, however, the headphones used in portable systems have little ability to reproduce signals below 60Hz. Applications using headphones with this limited frequency response reap little improvement by using a high value input capacitor. In addition to system cost and size, turn-on time is affected by the size of the input coupling capacitor Ci. A larger input coupling capacitor requires more charge to reach its quiescent DC voltage. This charge comes from the output via the feedback. Thus, by minimizing the capacitor size based on necessary low frequency response, turn-on time can be minimized. A small value of Ci, 1F, is recommended. Bypass Capacitor, CB Besides minimizing the input capacitor sizes, careful consideration should be paid to the bypass capacitor size. The bypass capacitor, CB, is the most critical component to minimize turn-on pops since it determines how fast the EUA5544 turns on. The slower the EUA5544's output ramp to their quiescent DC voltage (nominally 1/2 VDD), the smaller the turn-on pop. Output Coupling Capacitors, Cc Typical single-supply audio amplifiers that drive single-ended (SE) headphones use a coupling capacitor on each SE output. This output coupling capacitor blocks the half-supply voltage to which the output amplifiers are typically biased and couples the audio signal to the headphones. The output coupling capacitor and impedance of the load form a high-pass filter governed by equation. fc (highpass)=1/(2 RLCC) (4)
For example, a 220F capacitor with an 32 speaker would attenuate low frequencies below 22Hz. The main disadvantage, from a performance standpoint, is the load impedance is typically small, which drives the low-frequency corner higher degrading the bass response. Large values of CC are required to pass low frequencies into the load. Micro Power Shutdown The voltage applied to the Shutdown pin controls the EUA5544 shutdown function. Activate micro-power shutdown by applying a logic-low voltage to the Shutdown pin. When active, the EUA5544 micro-power shutdown feature turns off the amplifier's bias circuitry, reducing the supply current. There are a few ways to control the micro-power shutdown. These include using a single-pole, single-throw (SPST) switch, a microprocessor, or a microcontroller. When using a switch, connect an external pull-up resistor between the Shutdown pin and VDD. Connect the switch between the Shutdown pin and ground. Select normal amplifier operation by opening the switch. Closing the switch connects the Shutdown pin to ground, activating micro-power shutdown. The switch and resistor guarantee that the Shutdown pin will not float. This prevents unwanted state changes. In a system with a microprocessor or microcontroller, use a digital output to apply the control voltage to the Shutdown pin.
DS5544 Ver 2.4 Oct.2007
9
EUA5544
Packaging Information
SOP-8
SYMBOLS A A1 D E E1 L b e
MILLIMETERS MIN. MAX. 1.35 1.75 0.10 0.25 4.90 5.80 6.20 3.90 0.40 1.27 0.31 0.51 1.27
INCHES MIN. 0.053 0.004 0.193 0.228 0.153 0.016 0.012 0.050
MAX. 0.069 0.010 0.244 0.050 0.020
DS5544 Ver 2.4 Oct.2007
10

▲Up To Search▲

Price & Availability of EUA5544DIR1

	To Download EUA5544DIR1 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .