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PDF BL6211 Data sheet ( Hoja de datos )
| Número de pieza | BL6211 | |
| Descripción | 1.25 Watt Fully Differential Audio Power Amplifier | |
| Fabricantes | BELLING | |
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BL6211
1.25 Watt Fully Differential Audio Power Amplifier With
Internal Feedback Resistors
1 FEATURES
Fully differential amplifier
Improved PSRR at 217Hz(VDD>3.0V)
86dB (typ)
Power output at 5.0V & 1% THD
1.25W (typ)
Power output at 3.6V & 1% THD
0.6W (typ)
Ultra low shutdown current
0.01 A (typ)
Improved pop & click circuitry eliminates noises during turn-on and 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 package: 9-bump micro SMD and 8-pin MSOP8
2 GENERAL DESCRIPTION
The BL6211 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 BL6211 ideal for wireless handsets.
The BL6211 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, Handheld computers
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1 page  
BL6211
7.3 Electrical Characteristics
Table 4.
VDD=5V (The following specifications apply for 8 load AV=1V/V TA=25 , unless
otherwise specified.)
Parameter
Quiescent Power
Supply Current
Shutdown Current
Output Power
Total Harmonic
Distortion + Noise
Power Supply
Rejection Ratio
Common Mode
Rejection Ratio
Output Offset
Shutdown Voltage
Input High
Shutdown Voltage
Input Low
Symbol
IDD
ISD
PO
Conditions
VIN=0V, no load
VIN=0V, RL=8
VSHUTDOWN=GND
THD=1%(max); f=1kHz
THD+N PO=0.6Wrms; f=1kHz
PSRR
Vripple=200mV sine p-p
f=217Hz (note1)
f=1kHz (note1)
f=217Hz (Note2)
F=1KHz (Note2)
CMRR
VOS
VSDIH
f=217Hz VCM=200mVPP
VIN=0V
VSDIL
Closed Loop Gain AV
Note1: Unterminated input
Note2: 10 terminated input
Min
1.5
36k
Ri
Typ
2.5
4
0.01
1.25
0.02
-88
-83
-83
-83
-78
2
40k
Ri
Max
5
8
Unit
mA
1 µA
W
%
dB
dB
8 mV
V
0.5 V
44k
Ri
V/V
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5 Page 
BL6211
9 APPLICATION INFORMATION
9.1 Fully Differential Amplifier Description
The BL6211 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 BL6211 provides a "bridged mode" output configuration (bridge-tied-load, BTL). This means the
output signals at Vo1 and Vo2 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
BL6211 allows the input signal to be biased at voltage other than mid-supply of the BL6211, the
common-mode feedback circuit adjusts for it, and the outputs are still biased at mid-supply of the
BL6211.
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.
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11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet BL6211.PDF ] | |
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