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PDF BL6203 Data sheet ( Hoja de datos )
| Número de pieza | BL6203 | |
| Descripción | 1.25 Watt Fully Differential Audio Power Amplifier | |
| Fabricantes | BELLING | |
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BL6203
1.25 Watt Fully Differential Audio Power Amplifier
1 FEATURES
z Fully differential amplifier
z Improved PSRR at 217Hz (VDD>3.0V)
90dB (typ)
z Power output at 5.0V & 1% THD
1.25W (typ)
z Power output at 3.6V & 1% THD
0.6W (typ)
z Ultra low shutdown current
0.01µA (typ)
z Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions
z Thermal overload protection circuitry
z No output coupling capacitors, bootstrap capacitors required
z Unity-gain stable
z External gain configuration capability
z Available in space-saving package: 8-bump micro SMD
2 GENERAL DESCRIPTION
The BL6203 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 90dB PSRR at 217Hz, improved RF-rectification immunity, the space-saving 8-bump micro
SMD package, the advanced pop & click circuitry, a minimal count of external components and
low-power shutdown mode make BL6203 ideal for wireless handsets.
The BL6203 is unity-gain stable, and the gain can be configured by external resistors.
3 APPLICATIONS
z Wireless handsets
z Portable audio devices
z PDAs, Handheld computers
http://www.belling.com.cn
1 page  
BL6203
7.3 Electrical Characteristics
Table 4.
VDD=5V (The following specifications apply for 8Ωload，AV=1V/V，TA=25℃, unless
otherwise specified.)
Parameter
Symbol
Conditions
Min Typ Max Unit
Quiescent Power
Supply Current
IDD
VIN=0V, no load
VIN=0V, RL=8Ω
2.5 5
mA
48
Shutdown Current ISD
VSHUTDOWN=GND
0.01 1 µA
Output Power
Total Harmonic
Distortion + Noise
PO THD=1%(max); f=1kHz
THD+N PO=0.6Wrms; f=1kHz
1.25 W
0.02 %
Vripple=200mV sine p-p
Power Supply
Rejection Ratio
PSRR
f=217Hz (note1)
f=1kHz (note1)
f=217Hz (Note2)
-90
-85 dB
-85
F=1KHz (Note2)
-85
Common Mode
Rejection Ratio
CMRR f=217Hz VCM=200mVPP
-80 DB
Output Offset
Shutdown Voltage
Input High
VOS
VSDIH
VIN=0V
2
1.5
8 MV
V
Shutdown Voltage
Input Low
VSDIL
Note1: Unterminated input
0.5 V
Note2: 10Ωterminated input
http://www.belling.com.cn
5 Page 
9 APPLICATION INFORMATION
BL6203
9.1 Fully Differential Amplifier Description
The BL6203 is a fully differential amplifier with differential inputs and outputs. The fully differential
amplifier consists of a 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 BL6203 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
operation 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 amplifier with good CMRR, the
BL6203 allows the input signal to be biased at voltage other than mid-supply of the BL6203, the
common-mode feedback circuit adjusts for it, and the outputs are still biased at mid-supply of the
BL6203.
Mid-supply bypass capacitor, CBYPASS not required: The fully differential amplifier does not require a
bypass capacitor. 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 eliminated.
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.
http://www.belling.com.cn
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet BL6203.PDF ] | |
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