THS4509_14 Datasheet, PDF (1/43 Pages) Texas Instruments – WIDEBAND, LOW-NOISE, LOW-DISTORTION, FULLY-DIFFERENTIAL AMPLIFIER

THS4509
www.ti.com
SLOS454H – JANUARY 2005 – REVISED NOVEMBER 2009
WIDEBAND, LOW-NOISE, LOW-DISTORTION, FULLY-DIFFERENTIAL AMPLIFIER
Check for Samples: THS4509
FEATURES
1
•23 Fully-Differential Architecture
• Centered Input Common-Mode Range
• Output Common-Mode Control
• Minimum Gain of 2 V/V (6 dB)
• Bandwidth: 1900 MHz
• Slew Rate: 6600 V/μs
• 1% Settling Time: 2 ns
• HD₂: –75 dBc at 100 MHz
• HD₃: –80 dBc at 100 MHz
• 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
• 5-V Data Acquisition Systems High
Linearity ADC Amplifiers
• Wireless Communication
• Medical Imaging
• Test and Measurement
250 W
Mini-Circuits
ADT2-1T
V_IN
1:1.4
50 W
V_CM
0.1 mF
50 W
+V_S = 5 V
+
THS4509
-
Mini-Circuits
10 nF ^ADT2-1T
1:1.4
V_OUT
953 W
10 nF
V_OUT
= 20 dB
V_IN
250 W
Measured 3rd Order Intermodulation
Spurious Signal Level
-60
-70
-80
-90
-100
-110
-120
0
50
100 150
200 250
f - Frequency - MHz
DESCRIPTION
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 V_PP, 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.
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.
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.
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.
RELATED PRODUCTS
DEVICE
THS4508
THS4509
THS4511
THS4513
MIN. GAIN
6 dB
6 dB
0 dB
0 dB
COMMON-MODE RANGE OF
INPUT⁽¹⁾
–0.3 V to 2.3 V
1.1 V to 3.9 V
–0.3 V to 2.3 V
1.1 V to 3.9 V
1. Assumes a 5-V single-ended power supply.
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.
PowerPAD is a trademark of Texas Instruments Incorporated.
2
All other trademarks are the property of their respective owners.
3
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