THS4509
www.ti.com
SLOS454H –JANUARY 2005–REVISED NOVEMBER 2009
WIDEBAND, LOW-NOISE, LOW-DISTORTION, FULLY-DIFFERENTIAL AMPLIFIER
Check for Samples: THS4509
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FEATURES
DESCRIPTION
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Fully-Differential Architecture
Centered Input Common-Mode Range
Output Common-Mode Control
Minimum Gain of 2 V/V (6 dB)
Bandwidth: 1900 MHz
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The THS4509 is a wideband, fully-differential op amp
designed for 5-V data acquisition systems. It has a
low noise at 1.9 nV/√Hz, and 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 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 a minimum gain of 6 dB, but is optimized for gains
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
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 midsupply, with less than
4-mV differential offset voltage. The common-mode
set point is set to midsupply 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)
Power-Supply Voltage: 3 V to 5 V
Power-Supply Current: 37.7 mA
Power-Down Current: 0.65 mA
APPLICATIONS
The input and output are optimized for best
performance with the common-mode voltages set to
midsupply. Along with high performance at low
power-supply voltage, this design makes it ideal for
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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5-V Data Acquisition Systems High
Linearity ADC Amplifiers
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Wireless Communication
Medical Imaging
Test and Measurement
250 W
Mini-Circuits
ADT2-1T
1:1.4
Mini-Circuits
ADT2-1T
1:1.4
+VS = 5 V
10 nF
50 W
VIN
VOUT
+
The THS4509 is offered in a quad, leadless QFN-16
package (RGT), and is characterized for operation
over the full industrial temperature range from –40°C
to +85°C.
953 W
VCM
THS4509
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10 nF
50 W
0.1 mF
250 W
VOUT
Measured 3rd Order Intermodulation
Spurious Signal Level
-60
= 20 dB
VIN
RELATED PRODUCTS
-70
-80
-90
COMMON-MODE RANGE OF
DEVICE
THS4508
THS4509
THS4511
THS4513
MIN. GAIN INPUT(1)
6 dB
6 dB
0 dB
0 dB
–0.3 V to 2.3 V
-100
1.1 V to 3.9 V
–0.3 V to 2.3 V
1.1 V to 3.9 V
-110
-120
0
50
100
150
200
250
f - Frequency - MHz
1. Assumes a 5-V single-ended power supply.
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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.
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PowerPAD is a trademark of Texas Instruments Incorporated.
All other trademarks are the property of their respective owners.
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 © 2005–2009, Texas Instruments Incorporated