THS4509-Q1
www.ti.com ........................................................................................................................................................................................... SLOS547–NOVEMBER 2008
WIDEBAND LOW-NOISE LOW-DISTORTION FULLY DIFFERENTIAL AMPLIFIER
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FEATURES
DESCRIPTION
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Qualified for Automotive Applications
Fully Differential Architecture
Centered Input Common-Mode Range
Minimum Gain of 2 V/V (6 dB)
Bandwidth: 1900 MHz
The THS4509 is
a
wideband, fully differential
operational
amplifier designed for 5-V
data-acquisition systems. It has very low noise at
1.9 nV/√Hz, and extremely low harmonic distortion of
–75-dBc HD2 and –80-dBc HD3 at 100 MHz with
2 Vpp, G = 10 dB, and 1-kΩ load. Slew rate is very
high at 6600 V/µs 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.
Slew Rate: 6600 V/µs
1% Settling Time: 2 ns
HD2: –75 dBc at 100 MHz
HD3: –80 dBc at 100 MHz
OIP2: 73 dBm at 70 MHz
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 3-mV offset (typ) from the set voltage,
when set within 0.5 V of mid-supply, with less than
4-mV differential offset voltage. The common-mode
set point is set to mid-supply by internal circuitry,
which may be overdriven from an external source.
OIP3: 37 dBm at 70 MHz
Input Voltage Noise: 1.9 nV/√Hz (f > 10 MHz)
Noise Figure: 17.1 dB
Output Common-Mode Control
Power Supply:
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Voltage: 3 V (±1.5 V) to 5 V (±2.5 V)
Current: 37.7 mA
The input and output are optimized for best
performance with their common-mode voltages set to
mid-supply. Along with high-performance at low
power-supply voltage, this makes for extremely
high-performance single-supply 5-V data-acquisition
systems. The combined performance of the THS4509
in a gain of 10 dB driving the ADS5500 ADC,
sampling at 125 MSPS, is 81-dBc SFDR and
69.1-dBc SNR with a –1-dBFS signal at 70 MHz.
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Power-Down Capability: 0.65 mA
APPLICATIONS
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5-V Data Acquisition Systems High Linearity
ADC Amplifier
Wireless Communication
Medical Imaging
Test and Measurement
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The THS4509 is offered in a quad 16-pin leadless
QFN package (RGT) and is characterized for
operation over the full automotive temperature range
from –40°C to 125°C.
RELATED PRODUCTS
DEVICE
MINIMUM
GAIN
COMMON-MODE
RANGE OF INPUT(1)
100 Ω
348 Ω
2.5 V
V
IN
From
50 Ω
Source
THS4509
6 dB
0.75 V to 4.25 V
69.8 Ω
(1) Assumes a 5-V single-ended power supply
V
OUT
487 Ω
487 Ω
1:1
To 50 Ω
Test
Equipment
56.3 Ω
THS 4509
100 Ω
0.22 µF
49.9 Ω
CM
69.8 Ω
Open
−2.5 V
348 Ω
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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 © 2008, Texas Instruments Incorporated