Document
DATA SHEET
Part No. Package Code No.
AN12959A
UBGA021-W-2525AEA
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Publication date: October 2008
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AN12959A Contents
Overview Features Package Type ……..……………………………………………………………………………………………………. 3 ……..……………………………………………………………………………………………………. 3 ………………………………………………………………………………………………………. 3 …………………………………...………………………………………………………………………. 3
Applications
…………….………………………………………………………………………………………………… 3 …………………..………………………………………………………………………………. 5 ……………………..……………..…………………………......………………… 6 ………………….………………….…………………………………………………. 7 ……………………………………………………. 9
Application Circuit Example (Block Diagram) ……….…………………………………………………………. 4 Pin Descriptions Absolute Maximum Ratings Electrical Characteristics Technical Data Usage Notes
Operating Supply Voltage Range …………………………………………..……………………………………. 6 Electrical Characteristics (Reference values for design)
…………………………………….………….…………………………………………………. 10 ……….……………………….………………….…………………………………………………. 26
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AN12959A
AN12959A
I2C bus control compatible AGC built-in stereo BTL amplifier IC (For driving a piezoelectric speaker)
Overview
AN12959A has a built-in AGC function in a stereo BTL amplifier for driving a piezoelectric speaker to prevent noise at output clip. And I2C bus control method is applied in switching of each mode like some Standby function is turned ON/OFF.
Features
y The piezoelectric speaker can be driven by applying the circuit of high withstand voltage power amplifier. y On level in AGC can be selected by controlling I2C bus. y Attack and recovery times in AGC can be selected by controlling I2C bus. y Resistance and capacitor, which were used for conventional analog AGC aren’t needed anymore. y I2C is controlled almost in the same way as those of AN12979A/AN12978A. y Shut-down function is mounted. y Amplifier gain switching y The input circuit constructs a bus boost circuit easily and improves the sound quality of the piezoelectric speaker.
Applications
y Audio amplifier for mobile, such as a cellular phone
Package
y 21 pin plastic quad 5 column BGA package (0.5 mm pitch)
Type
y Silicon Monolithic Bi-CMOS IC
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AN12959A
Application Circuit Example (Block Diagram)
VCC = 3 V
VREF 7.5 Ω to 10 Ω
Piezoelectric speaker
GND ROUT_POS E2 N.C. D2 +14 dB D3 N.C. C3 E3
1 μF VCC E4 E5 GND
1 μF
GND_SPR
E1
ROUT_NEG D1 7.5 Ω to 10 Ω VCC_SP = 6.1 V VCC_SP C1 1 μF VREF_SP 1 μF
Piezoelectric speaker
+14 dB Gain Select +6 dB / 0 dB AGC VREG (5 V) AGC DET AGC +14 dB
D4 PREOUT_R
+ −
10 kΩ D5 FB_R
1500 pF 10 kΩ INPUT_R 0.1 μF 10 kΩ INPUT_L 0.1 μF
C2
7.5 Ω to 10 Ω LOUT_NEG
B1 +14 dB
+6 dB / 0 dB Gain Select I2C-BUS Control
− +
C5 FB_L 10 kΩ C4 PREOUT_L
1500 pF
GND_SPL
A1
A5
GND
A2 7.5 Ω to 10 Ω LOUT_POS
B2 N.C. 0.1 μF * VCC_D
B3 A3 S.D VCC_D
B4 SDA 2.2 kΩ
A4 SCL 2.2 kΩ
Operate Shutdown
1 μF VCC_D = 1.8 V
B3 pin Operate voltage VCC_D = 1.8 V Operate > 1.62 V Shut-down < 0.18 V
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VCC_D = 2.6 V Operate > 2.34 V Shut-down < 0.26 V
Note) 1. This circuit and these circuit constants show an example and do not guarantee the design as a mass-production set. 2. *:The threshold voltage at Pin B3 has the VCC_D dependency.
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AN12959A
Pin Descriptions
Pin No. A1 A2 A3 A4 A5 B1 B2 B3 B4 C1 C2 C3 C4 C5 D1 D2 D3 D4 D5 E1 E2 E3 E4 E5 Pin name GND_SPL LOUT_POS VCC_D SCL GND LOUT_NEG N.C. S.D SDA VCC_SP VREF_SP N.C. PREOUT_L FB_L ROUT_NEG N.C. GND PREOUT_R FB_R GND_SPR ROUT_POS VREF VCC GND Type Ground Output Power Supply Input Ground Output — — Input / Output Power Supply Input — Output Input Output — Ground Output Input Ground Output Input Power Supply Ground Grounding (For speaker L-channel) Speaker output L-channel (+) VCC_D for logic circuit SCL Grounding Speaker output L-channel(–) N.C. Shut-down pin SDA VCC_SP for the circuit of speaker output Reference voltage pin for the circuit of speaker output N.C. First amplifier output L-channel First amplifier negative feedback input L-channel Speaker output R-channel(–) N.C. Grounding First amplifier output R-channel First amplifier negative feedback input R-channel Grounding (For speaker R-channel) Speaker output R-channel(+) Reference voltage pin Power supply VCC Grounding Description
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AN12959A
Absolute Maximum Ratings
A No. Parameter Symbol VCC 1 Supply voltage VCC_D VCC_SP 2 3 4 5 6 Supply current Input voltage Power dissipation Operating ambient temperature Storage temperature ICC VI PD Topr Tstg Rating 5.0 3.6 12 — — 113 –20 to +70 –55 to +150 A V mW °C °C — — *2 *3 *3 V *1 Unit Note
Note) *1: The values under the condition not exceeding the above absolute maximum ratings and the power dissipation. *2: The power dissipation shown is the value at Ta = 70°C for the independent (unmounted) IC package without a heat sink. When using this IC, refer to the • PD – Ta diagram in the Technical Data and use under the condition.