THS4509-Q1 Datasheet, PDF (1/40 Pages) Texas Instruments – WIDEBAND LOW-NOISE LOW-DISTORTION FULLY DIFFERENTIAL AMPLIFIER

THS4509-Q1
www.ti.com........................................................................................................................................................................................... SLOS547 – NOVEMBER 2008
WIDEBAND LOW-NOISE LOW-DISTORTION FULLY DIFFERENTIAL AMPLIFIER
FEATURES
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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
• 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
• 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:
– Voltage: 3 V (±1.5 V) to 5 V (±2.5 V)
– Current: 37.7 mA
• Power-Down Capability: 0.65 mA
APPLICATIONS
• 5-V Data Acquisition Systems High Linearity
ADC Amplifier
• Wireless Communication
• Medical Imaging
• Test and Measurement
RELATED PRODUCTS
DEVICE
MINIMUM
GAIN
COMMON-MODE
RANGE OF INPUT⁽¹⁾
THS4509
6 dB
0.75 V to 4.25 V
(1) Assumes a 5-V single-ended power supply
DESCRIPTION
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.
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.
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.
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.
V_IN
From
50 Ω
Source
100 Ω
69.8 Ω
348 Ω
2.5 V
0.22 µF
49.9 Ω
100 Ω
THS 4509
69.8 Ω
CM
−2.5 V
348 Ω
487 Ω
487 Ω
1:1
56.3 Ω
V_OUT
To 50 Ω
Test
Equipment
Open
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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