THS4502 Datasheet, PDF (21/49 Pages) Texas Instruments – WIDEBAND, LOW-DISTORTION FULLY DIFFERENTIAL AMPLIFIERS

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THS4502
THS4503
SLOS352E – APRIL 2002 – REVISED OCTOBER 2011
APPLICATION INFORMATION
MAXIMUM DIE TEMPERATURE TO PREVENT
OSCILLATION
The THS4502 and THS4503 may have low level
oscillation when the die temperature (also called
junction temperature) exceeds +60°C and is not
recommended for new designs where the die
temperature is expected to exceed +60°C.
The oscillation is due to internal design and external
configuration is not expected to mitigate or reduce the
problem. This problem is random due to normal
process variations and normal testing cannot identify
problem units.
The THS4500 and THS4501 are recommended
replacement devices.
The die temperature depends on the power
dissipation and the thermal resistance of the device
and can be approximated with the following formula:
Die Temperature = P_DISS × θJ_A + T_A
Where:
P_DISS ≈ (V_{S (TOTAL)} × I_Q) + (V_S+ – V_OUT) × I_OUT
Table 1 shows the estimated maximum ambient
temperature (T_A max) in °C for each package option
of the THS4502 and THS4503 using the thermal
dissipation rating given in the PACKAGE
DISSIPATION RATINGS table for a JEDEC standard
High-K test PCB. For each case shown, V_{S (TOTAL)} =
FULLY DIFFERENTIAL AMPLIFIERS
Differential signaling offers a number of performance
advantages in high-speed analog signal processing
systems, including immunity to external
common-mode noise, suppression of even-order
nonlinearities, and increased dynamic range. Fully
differential amplifiers not only serve as the primary
means of providing gain to a differential signal chain,
but also provide a monolithic solution for converting
single-ended signals into differential signals for
easier, higher performance processing. The THS4500
family of amplifiers contains products in Texas
Instruments' expanding line of high-performance fully
differential amplifiers. Information on fully differential
amplifier fundamentals, as well as implementation
specific information, is presented in the applications
section of this data sheet to provide a better
understanding of the operation of the THS4500 family
of devices, and to simplify the design process for
designs using these amplifiers.
Applications Section
• Fully Differential Amplifier Terminal Functions
• Input Common-Mode Voltage Range and the
THS4500 Family
10V, R_L = 800 Ω differential, and the quiescent
current = 32mA (the maximum over 0°C to 70°C
temperature range). The last entry for each package
option lists the worst case where the output voltage is
5V DC.
Table 1. Estimated Maximum Ambient
Temperature Per Package Option
PACKAGE/DEVICE
V_out
ΘJ_A
T_A MAX
SOIC
0V
28.8°C
2 Vpp
28.0°C
THS4502D
THS4503D
4 Vpp
6 Vpp
97.5°C/W
27.3°C
26.8°C
8 Vpp
26.3°C
Worst Case =>
5 DC
25.8°C
PWR Pad MSOP
0V
41.3°C
2 Vpp
40.8°C
THS4502DGN
THS4503DGN
4 Vpp
6 Vpp
58.4°C/W
40.4°C
40.1°C
8 Vpp
39.8°C
Worst Case =>
5 DC
39.5°C
MSOP
0V
-23.2°C
2 Vpp
-25.3°C
THS4502DGK
THS4503DGK
4 Vpp
6 Vpp
260°C/W
-27.1°C
-28.6°C
8 Vpp
-29.8°C
Worst Case =>
5 DC
-31.3°C
• Choosing the Proper Value for the Feedback and
Gain Resistors
• Application Circuits Using Fully Differential
Amplifiers
• Key Design Considerations for Interfacing to an
Analog-to-Digital Converter
• Setting the Output Common-Mode Voltage With
the V_OCM Input
• Saving Power With Power-Down Functionality
• Linearity: Definitions, Terminology, Circuit
Techniques, and Design Tradeoffs
• An Abbreviated Analysis of Noise in Fully
Differential Amplifiers
• Printed-Circuit Board Layout Techniques for
Optimal Performance
• Power Dissipation and Thermal Considerations
• Power Supply Decoupling Techniques and
Recommendations
• Evaluation Fixtures, Spice Models, and
Applications Support
• Additional Reference Material
Copyright © 2002–2011, Texas Instruments Incorporated
Product Folder Link(s): THS4502 THS4503
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