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TS4956
Stereo audio amplifier system with I2C bus interface
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Operating from VCC = 2.7 V to 5.5 V I²C bus control interface 38 mW output power @ VCC = 3.3 V, THD = 1%, F = 1 kHz, with 16Ω Load Ultra low consumption in standby mode: 0.5 µA Digital volume control range from +12 dB to -34 dB 32-step digital volume control Stereo loudspeaker option by I2C 8 different output mode selections Pop & click reduction circuitry Flip-chip package, 18 bumps with 300 µm diameter Lead-free flip chip package Output power limitation on headphone for eardrum damage consideration
RIN PGH
TS4956 - Flip-Chip18
Pin connections (top view)
GND
MLO
LHP-
RHP+
VCC
SDA
LIN
BYPASS
Description
The TS4956 is a complete audio system device with three dedicated outputs, one stereo headphone, one loudspeaker drive and one mono line for a hands-free set. The stereo headphone is capable of delivering more than 25 mW per channel of continuous average power into 16Ω single-ended loads with 0.3% THD+N from a 5 V power supply. The device functions are controlled via an I²C bus, which minimizes the number of external components needed. The overall gain and the different output modes of the TS4956 are controlled digitally by the control registers which are programmed via the I²C interface. It has also an internal thermal shutdown protection mechanism.
VCC MIN SRP+ SRN-
I2CVCC
MIP
GND
SCL
Applications
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Mobile phones (cellular / cordless) PDAs Laptop / notebook computers Portable audio devices
Device summary table
Part Number TS4956EIJT Temperature Range -40°C to +85°C Package Lead free flip-chip18 Packing Tape & Reel Marking 56
May 2006
Rev. 3
1/51
www.st.com
51
Absolute maximum ratings & operating conditions
TS4956
1
Absolute maximum ratings & operating conditions
Table 1.
Symbol VCC Vi Toper Tstg Tj Rthja Pdiss ESD Latch-up Supply voltage
(1)
Absolute maximum ratings (AMR)
Parameter Input voltage (2) Operating free air temperature range Storage temperature Maximum junction temperature Thermal resistance junction to ambient (3) Power dissipation Susceptibility - human body Latch-up immunity Lead temperature (soldering, 10sec) model(5) Susceptibility - machine model Value 6 G ND to VCC -40 to + 85 -65 to +150 150 200 Internally limited(4) 2 150 200 260 kV V mA °C Unit V V °C °C °C °C/W
1. All voltage values are measured with respect to the ground pin. 2. The magnitude of input signal must never exceed VCC + 0.3V / GND - 0.3V 3. Device is protected in case of over temperature by a thermal shutdown activated at 150°C. 4. Exceeding the power derating curves during a long period may involve abnormal operating conditions. 5. Human body model, 100 pF discharged through a 1.5 kΩ resistor, into pin to VCC device
Table 2.
Symbol VCC(1) RL
Operating conditions
Parameter Supply voltage Load resistor Speaker/BTL output (modes 1,2,7) Headphone, MLO output (modes 3,4,5,6,) Load capacitor RL = 8Ω to 100Ω (Speaker/BTL output - modes 1,2,7) RL = 16Ω to 100Ω (Headphone, MLO output - modes 3,4,5,6) RL > 100Ω Flip-chip thermal resistance junction to ambient Value 2.7 to 5.5V
≥8 ≥16
Unit V Ω
CL
500 400 100 90(2)
pF
Rthja
°C/W
1. For proper functionality of I2C bus, V CC pins must not be grounded. ESD protection diodes ground data and clock wires and cause dysfunction of I2C bus in this condition. 2. With heat sink surface 120mm2
Table 3.
Symbol I2CV
CC
I²C electrical characteristics
Parameter I2C supply voltage(1) Maximum low level input voltage on pins SDA, SCL Minimum high level input voltage Maximum input current (pins SDA, SCL), 0.4V < V in < 4.5V SCL maximum clock frequency Max low level output voltage, SDA pin, Isink = 3mA Value 2.7V to 5.5V 0.3 I2CVCC 0.7 I2CVCC 10 400 0.4 Unit V V V µA kHz V
VILl VIH IIN FSCL Vol
1. Must be less or equal than power supply voltage VCC of the device
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TS4956
Typical application schematic
2
Typical application schematic
Table 4. External components descriptions
Functional description Supply bypass capacitors which provide power supply filtering. Bypass capacitor which provides half-supply filtering. Input capacitors which form together with input impedance Zin first-order high pass filter to block DC voltage on inputs Output capacitor which forms with output load RL first-order high pass filter to block half-supply voltage on single-ended output. Resistor to keep Cout charged for better pop performance on single-ended output.
Components Cs1, C s2 Cb Cin1 to Cin4 Cout R1
Figure 1.
Typical application for the TS4956 (mode 1, 2, 3, 4, 5, 6)
Vcc
Cs1 1µF
Cs2 100nF
+
C5
C3
Vcc
Vcc
TS4956
Diff. input +
Cin1 A1 + 330nF Cin2 A2
LHP Amplifier
MIP
Stereo Input Left
PHG Amplifier
LHP
MODE3: Gx(MIP+MIN) MODE4: GxLIN
B6
16/32 Ohms
MIN
Diff. input SE input left
+ 330nF
Stereo Input Right
RHP Amplifier
PHG
A7
MODE3: Gx(MIP+MIN) MODE4: GxRIN
Cin3 + 330nF B4
Mode Select LIN Stereo Input Left
RHP
Speaker Amplifier
D6
16/32 .