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TS4994 Datasheet

1W Differential Input/Output Audio Power Amplifier

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TS4994
1W differential input/output audio power amplifier
with selectable standby
Features
Differential inputs
Near-zero pop & click
100dB PSRR @ 217Hz with grounded inputs
Operating range from VCC = 2.5V to 5.5V
1W rail-to-rail output power @ VCC = 5V,
THD = 1%, F = 1kHz, with 8Ω load
90dB CMRR @ 217Hz
Ultra-low consumption in standby mode (10nA)
Selectable standby mode (active low or active
high)
Ultra fast startup time: 15ms typ.
Available in DFN10 3x3 (0.5mm pitch) &
MiniSO-8
All lead-free packages
Description
The TS4994 is an audio power amplifier capable
of delivering 1W of continuous RMS output power
into an 8Ω load @ 5V. Due to its differential inputs,
it exhibits outstanding noise immunity.
An external standby mode control reduces the
supply current to less than 10nA. An STBY
MODE pin allows the standby to be active HIGH
or LOW (except in the MiniSO-8 version). An
internal thermal shutdown protection is also
provided, making the device capable of sustaining
short-circuits.
The device is equipped with common mode
feedback circuitry allowing outputs to be always
Pin connections (top view)
TS4994IQT - DFN10
STBY 1
VIN -
STBY MODE
2
3
VIN + 4
BYPASS 5
10 VO+
9 VDD
8 N/C
7 GND
6 VO-
TS4994IST - MiniSO-8
STBY
VIN-
VIN+
BYPASS
1
2
3
4
8 VO+
7 Vcc
6 GND
5 VO-
biased at VCC/2 regardless of the input common
mode voltage.
The TS4994 is designed for high quality audio
applications such as mobile phones and requires
few external components.
Applications
Mobile phones (cellular / cordless)
Laptop / notebook computers
PDAs
Portable audio devices
Order codes
Part number
TS4994IQT
TS4994IST
Temperature range
-40°C to +85°C
Package
DFN10
MiniSO-8
Packing
Tape & reel
Marking
K994
K994
December 2006
Rev 6
1/35
www.st.com
35


STMicroelectronics Electronic Components Datasheet

TS4994 Datasheet

1W Differential Input/Output Audio Power Amplifier

No Preview Available !

Contents
Contents
TS4994
1 Application component information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 5
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.1 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.2 Gain in typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.4 Low and high frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.5 Calculating the influence of mismatching on PSRR performance . . . . . . 23
4.6 CMRR performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.7 Power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.8 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.9 Wake-up time: tWU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.10 Shutdown time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.11 Pop performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.12 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.13 Demoboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.1 DFN10 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.2 MiniSO-8 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2/35


Part Number TS4994
Description 1W Differential Input/Output Audio Power Amplifier
Maker STMicroelectronics
Total Page 30 Pages
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