Datasheet

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