TPA6120A2 Datasheet, PDF (1/24 Pages) Texas Instruments – HIGH FIDELITY HEADPHONE AMPLIFIER

www.ti.com
HIGH FIDELITY HEADPHONE AMPLIFIER
TPA6120A2
SLOS431 – MARCH 2004
FEATURES
• 80 mW into 600 Ω From a ±12-V Supply at
0.00014% THD + N
• Current-Feedback Architecture
• Greater than 120 dB of Dynamic Range
• SNR of 120 dB
• Output Voltage Noise of 5 µVrms at
Gain = 2 V/V
• Power Supply Range: ±5 V to ±15 V
• 1300 V/µs Slew Rate
• Differential Inputs
• Independent Power Supplies for Low
Crosstalk
• Short Circuit and Thermal Protection
APPLICATIONS
• Professional Audio Equipment
• Mixing Boards
• Headphone Distribution Amplifiers
• Headphone Drivers
• Microphone Preamplifiers
DESCRIPTION
The TPA6120A2 is a high fidelity audio amplifier built
on a current-feedback architecture. This high
bandwidth, extremely low noise device is ideal for
high performance equipment. The better than 120 dB
of dynamic range exceeds the capabilities of the
human ear, ensuring that nothing audible is lost due
to the amplifier. The solid design and performance of
the TPA6120A2 ensures that music, not the amplifier,
is heard.
Three key features make current-feedback amplifiers
outstanding for audio. The first feature is the high
slew rate that prevents odd order distortion
anomalies. The second feature is current-on-demand
at the output that enables the amplifier to respond
quickly and linearly when necessary without risk of
output distortion. When large amounts of output
power are suddenly needed, the amplifier can re-
spond extremely quickly without raising the noise
floor of the system and degrading the signal-to-noise
ratio. The third feature is the gain-independent fre-
quency response that allows the full bandwidth of the
amplifier to be used over a wide range of gain
settings. The excess loop gain does not deteriorate at
a rate of 20 dB/decade.
PCM
Audio
Data
Source
Controller
AUDIO DAC
LRCK
BCK
DATA
SCK
I_OUT L−
I_OUT L+
ZEROL
ZEROR
MS
MDI
MC
MDO
RST
PCM1792
or
DSD1792
I_OUT R+
I_OUT R−
Filter and I/V Gain Stage
1/2 OPA4134
C_F 2.7 nF
R_F
−IN A
+IN A
+IN B
−IN B
R_F
1 kΩ
OUT A ^RI
1 kΩ
OUT B ^RI
1 kΩ
1 kΩ
C_F 2.7 nF
1/2 OPA4134
C_F 2.7 nF
+IN C
−IN C
+IN D
−IN D
R_F 1 kΩ
OUT C ^RI
1 kΩ
OUT D ^RI
1 kΩ
R_F 1 kΩ
Stereo Hi−Fi
Headphone Driver
TPA6120A2
R_F
1 kΩ
LIN−
LIN+
R_F
1 kΩ
R_{O LOUT}
10 Ω
R_F
1 kΩ
RIN+
RIN−
R_F
1 kΩ
R_O
10 Ω
ROUT
DYR > 120 dB
for Whole
System!
C_F 2.7 nF
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004, Texas Instruments Incorporated