THS4503-EP Datasheet, PDF (32/40 Pages) Texas Instruments – WIDEBAND, LOW-DISTORTION FULLY DIFFERENTIAL AMPLIFIERS

THS4503−EP
SGLS291A − APRIL 2005 − JANUARY 2012
EVALUATION FIXTURES, SPICE MODELS,
AND APPLICATIONS SUPPORT
Texas Instruments is committed to providing its customers
with the highest quality of applications support. To support
this goal, an evaluation board has been developed for the
THS4500 family of fully differential amplifiers. The
evaluation board can be obtained by ordering through the
Texas Instruments web site, www.ti.com, or through your
local Texas Instruments sales representative. Schematic
for the evaluation board is shown below with their default
component values. Unpopulated footprints are shown to
provide insight into design flexibility.
C4 _C0805
R4
R0805
J1
C1
R2
V_S
PD
U1
1
3
_
7
THS450X
4
R6
C5
J2
C0805
J2
C0805 _R0805
R1
C2
R1206
R0805
C0805
R3
8+
26
R0805
C7
C0805
5 ^R0805
PwrPad R7
C6
J3
J3
V_OCM ^−VS
R5 R0805
C0805
C3
C0805
J2
R8
43
J4
R0805
R9 5
J3
R0805
R0805
R11
R1206
R9
61
T1
Simplified Schematic of the Evaluation Board. Power
Supply Decoupling, V_OCM, and Power Down Circuitry
Not Shown
Figure 116
www.ti.com
Computer simulation of circuit performance using SPICE
is often useful when analyzing the performance of analog
circuits and systems. This is particularly true for video and
RF amplifier circuits where parasitic capacitance and
inductance can have a major effect on circuit performance.
A SPICE model for the THS4500 family of devices is
available through the Texas Instruments web site
(www.ti.com). The PIC is also available for design
assistance and detailed product information. These
models do a good job of predicting small-signal ac and
transient performance under a wide variety of operating
conditions. They are not intended to model the distortion
characteristics of the amplifier, nor do they attempt to
distinguish between the package types in their
small-signal ac performance. Detailed information about
what is and is not modeled is contained in the model file
itself.
ADDITIONAL REFERENCE MATERIAL
D PowerPAD Made Easy, application brief, Texas Instruments (SLMA004)
D PowerPAD Thermally Enhanced Package, technical brief, Texas Instruments (SLMA002)
D Karki, James. Fully Differential Amplifiers. application report, Texas Instruments (SLOA054D)
D Karki, James. Fully Differential Amplifiers Applications: Line Termination, Driving High-Speed ADCs, and Differential
Transmission Lines. Texas Instruments Analog Applications Journal, February 2001
D Carter, Bruce. A Differential Op-Amp Circuit Collection. application report, Texas Instruments (SLOA064)
D Carter, Bruce. Differential Op-Amp Single-Supply Design Technique, application report, Texas Instruments
(SLOA072)
D Karki, James. Designing for Low Distortion with High-Speed Op Amps. Texas Instruments Analog Applications
Journal, July 2001
32