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THS4508 Datasheet Preview

THS4508 Datasheet

LOW DISTORTION FULLY DIFFERENTIAL AMPLIFIER

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THS4508
www.ti.com .................................................................................................................................... SLAS459E – SEPTEMBER 2005 – REVISED SEPTEMBER 2008
WIDEBAND, LOW NOISE, LOW DISTORTION FULLY DIFFERENTIAL AMPLIFIER
FEATURES
1
Fully Differential Architecture
Common-Mode Input Range Includes the
Negative Rail
Minimum Gain of 2 V/V (6 dB)
Bandwidth: 2 GHz
Slew Rate: 6400 V/µs
1% Settling Time: 2 ns
HD2: –72 dBc at 100 MHz
HD3: –79 dBc at 100 MHz
OIP2: 78 dBm at 70 MHz
OIP3: 42 dBm at 70 MHz
Input Voltage Noise: 2.3 nV/Hz (f > 10 MHz)
Noise Figure: 19.2 dB (G = 10 dB)
Output Common-Mode Control
5-V Power Supply Current: 39.2 mA
Power-Down Capability: 0.65 mA
APPLICATIONS
5-V Data-Acquisition Systems
High Linearity ADC Amplifier
Wireless Communication
Medical Imaging
Test and Measurement
DESCRIPTION
The THS4508 is a wideband, fully-differential
operational amplifier designed for single-supply 5-V
data acquisition systems. It has very low noise at 2.3
nV/Hz, and extremely low harmonic distortion of –72
dBc HD2 and –79 dBc HD3 at 100 MHz with 2 VPP,
G = 10 dB, and 1-kload. Slew rate is very high at
6400 Vµs, and with settling time of 2 ns to 1% (2 V
step), it is ideal for pulsed applications. It is designed
for minimum gain of 6 dB, but is optimized for gain of
10 dB.
To allow for dc coupling to analog-to-digital
converters (ADCs), its unique output common-mode
control circuit maintains the output common-mode
voltage within 5-mV offset (typical) from the set
voltage, when set within 0.5 V of mid-supply. The
common-mode set point is set to mid-supply by
internal circuitry, which may be over-driven from an
external source.
The THS4508 is a high-performance amplifier that
has been optimized for use in high performance, 5-V
single-supply data acquisition systems. The output
has been optimized for best performance with its
common-mode voltages set to mid-supply, and the
input has been optimized for best performance with
its common-mode voltage set to 0.7 V. High
performance at a low power-supply voltage is ideal
for high-performance, single-supply 5-V
data-acquisition systems with a minimum parts count.
The combined performance of the THS4508 in a gain
of 10-dB driving the ADS5500 ADC, sampling at 125
MSPS, is 82-dBc SFDR, and 68.3-dBc SNR with a
–1-dBFS signal at 70 MHz.
The THS4508 is offered in a quad 16-pin leadless
QFN package (RGT), and is characterized for
operation over the full industrial temperature range
from –40°C to +85°C.
RS = 75 W VIN 175 W
VSignal
130 W
348 W
VS+ = 5 V
75 W
175 W
130 W
THS4508
VS-
VCM
RO
VOUT-
RO
VOUT+
348 W
Figure 1. Video Buffer
1
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.
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 © 2005–2008, Texas Instruments Incorporated




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THS4508 Datasheet Preview

THS4508 Datasheet

LOW DISTORTION FULLY DIFFERENTIAL AMPLIFIER

No Preview Available !

THS4508
SLAS459E – SEPTEMBER 2005 – REVISED SEPTEMBER 2008 .................................................................................................................................... www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
ABSOLUTE MAXIMUM RATINGS(1)
Over operating free-air temperature range (unless otherwise noted).
VSS
Supply voltage VS– to VS+
VI
Input voltage
VID
Differential input voltage
IO
Output current
Continuous power dissipation
TJ
Maximum junction temperature(2)
TJ
Maximum junction temperature, continuous operation, long term reliability(3)
TA
Operating free-air temperature range
Tstg
Storage temperature range
HBM
ESD ratings
CDM
MM
UNIT
5.5 V
±VS
4V
200 mA
See Dissipation Rating Table
+150°C
+125°C
–40°C to +85°C
–65°C to +150°C
2000 V
1500 V
100 V
(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not implied.
(2) The absolute maximum temperature under any condition is limited by the constraints of the silicon process.
(3) The maximum junction temperature for continuous operation is limited by the package constraints. Operation above this temperature
may result in reduced reliability and/or lifetime of the device. The THS4508 incorporates a (QFN) exposed thermal pad on the underside
of the chip. This acts as a heatsink and must be connected to a thermally dissipative plane for proper power dissipation. Failure to do so
may result in exceeding the maximum junction temperature which could permanently damage the device. See TI technical brief
SLMA002 and SLMA004 for more information about utilizing the QFN thermally enhanced package.
DISSIPATION RATINGS TABLE (PER PACKAGE)
PACKAGE
RGT (16)
θJC
2.4°C/W
θJA
39.5°C/W
POWER RATING
TA 25°C
TA = 85°C
2.3 W
225 mW
ORDERING INFORMATION(1)
PRODUCT
THS4508
PACKAGE-
LEAD
QFN-16
PACKAGE
DESIGNATOR
RGT
SPECIFIED
TEMPERATURE
RANGE
–40°C to +85°C
PACKAGE
MARKING
THS4508
ORDERING
NUMBER
THS4508RGTT
THS4508RGTR
TRANSPORT MEDIA,
QUANTITY
Tape and Reel, 250
Tape and Reel, 3000
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
Web site at www.ti.com.
2
Submit Documentation Feedback
Product Folder Link(s): THS4508
Copyright © 2005–2008, Texas Instruments Incorporated


Part Number THS4508
Description LOW DISTORTION FULLY DIFFERENTIAL AMPLIFIER
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