DGN-8 DGK-8 D-8
DRB-8
THS4271
THS4275
www.ti.com
SLOS397F – JULY 2002 – REVISED OCTOBER 2009
LOW NOISE, HIGH SLEW RATE, UNITY GAIN STABLE
VOLTAGE FEEDBACK AMPLIFIER
Check for Samples: THS4271 THS4275
FEATURES
1
•23 Unity Gain Stability
• Low Voltage Noise
– 3 nV/√Hz
• High Slew Rate: 1000 V/μs
• Low Distortion
– –92 dBc THD at 30 MHz
• Wide Bandwidth: 1.4 GHz
• Supply Voltages
– +5 V, ±5 V
• Power Down Functionality (THS4275)
• Evaluation Module Available
APPLICATIONS
• High Linearity ADC Preamplifier
• Wireless Communication Receivers
• Differential to Single-Ended Conversion
• DAC Output Buffer
• Active Filtering
Low-Noise, Low-Distortion, Wideband Application Circuit
50 Ω Source
+5 V
50 Ω
+
VI
49.9 Ω THS4271
VO
_
DESCRIPTION
The THS4271 and THS4275 are low-noise, high slew
rate, unity gain stable voltage-feedback amplifiers
designed to run from supply voltages as low as 5 V
and as high as ±5 V. The THS4275 offers the same
performance as the THS4271 with the addition of a
power-down capability. The combination of low-noise,
high slew rate, wide bandwidth, low distortion, and
unity gain stability make the THS4271 and THS4275
high performance devices across multiple ac
specifications.
Designers using the THS4271 are rewarded with
higher dynamic range over a wider frequency band
without the stability concerns of decompensated
amplifiers. The devices are available in SOIC, MSOP
with PowerPAD™, and leadless MSOP with
PowerPAD™ packages.
The THS4271 and THS4275 may have low-level
oscillation when the die temperature (also known as
the junction temperature) exceeds +60°C. For more
information, see Maximum Die Temperature to
Prevent Oscillation.
DEVICE
THS4211
THS4503
THS3202
RELATED DEVICES
DESCRIPTION
1-GHz voltage-feedback amplifier
Wideband, fully-differential amplifier
Dual, wideband current feedback amplifier
-5 V
249 Ω
249 Ω
NOTE: Power supply decoupling capacitors not shown
THS4271
NC
1
8
NC
IN−
2
7
VS+
IN+
3
6
VOUT
VS−
4
5
NC
HARMONIC AND INTERMODULATION
DISTORTION
vs
FREQUENCY
−40
Gain = 2
Rf = 249 Ω
−50 RL = 150 Ω
VO = 2 VPP
−60 VS = ±5 V
IMD3
200 kHz Tone Spacing
−70
VO = 2 VPP Envelope
−80
HD2
−90
HD3
−100
1
10
100
f − Frequency − MHz
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.
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 © 2002–2009, Texas Instruments Incorporated
