THS3491 Datasheet, PDF (1/28 Pages) Texas Instruments – 900-MHz, High-Power Output, Current Feedback Amplifier

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THS3491
SBOS875 – AUGUST 2017
THS3491 900-MHz, High-Power Output, Current Feedback Amplifier
1 Features
•1 Bandwidth:
– 900 MHz (V_O = 2 V_PP, A_V = 5 V/V)
– 320 MHz (V_O = 10 V_PP, A_V = 5 V/V)
• Bipolar Supply Range: ±7.0 V to ±16.0 V
• Single Supply Operation Capable
• 16.8-mA Trimmed Supply Current (Low Tempco)
• Output Swing: 28-V_PP (±16-V Supplies, 100-Ω
Load)
• Slew Rate: 8000 V/µs
• THD: < –65 dBc (50 MHz, V_O = 10 V_PP, 100-Ω
Load)
• Linear Output Current: ±380 mA
• Input Voltage Noise: 1.85 nV/√Hz
• Rise Time: < 1.5 ns (10-V Step, A_V = 5 V/V)
• Overshoot: < 4% (10-V Step, A_V = 5 V/V)
• Current Limit and Thermal Shutdown Protection
• Optional Power Disable
2 Applications
• High-Voltage, Arbitrary Waveform Generators
• LCR Meter Power Output Drivers
• Power FET Drivers
• High Capacitive Load Piezo Element Drivers
• VDSL Line Drivers
• Pin-Compatible Upgrade to THS3095 (DDA)
3 Description
The THS3491 device current-feedback amplifier
(CFA) provides a new level of performance for
applications requiring the lowest distortion at very
high output power levels through > 100-MHz
operating frequencies at 100 ohm loads. Although
specified at a gain of 5 V/V, this current feedback
design holds almost constant bandwidth and
distortion over a wide range of gains.
The remarkable 8000 V/µs slew rate delivers 10-V_PP
output into demanding loads with very low distortion
through 320 MHz. The 900-MHz, small-signal
bandwidth delivers a low overshoot of < 0.5-ns rise
time for a step of < 4 V.
New designs can benefit from the lowest distortion
using the VQFN-16 (RGT) package; whereas, the 8-
pin SO PowerPAD™ (DDA) package can be used to
upgrade existing THS3091 or THS3095 designs.
Lower output headroom for the THS3491 gives more
output swing on the same ±15-V supplies versus
legacy THS3091 or THS3095 solutions.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
THS3491
VQFN (16)
SO PowerPAD (8)
3.00 mm × 3.00 mm
4.89 mm × 3.90 mm
(1) For all available packages, see the package option addendum
at the end of the data sheet.
Typical Arbitrary Waveform Generator Output Drive Circuit
+VCC
±VCC
15 V
±15 V
THS3217
Output
49.9
High power gain of
5 V/V output driver
with load sharing
Passive
Filter
250
1
140
562
+VCC
49.9
THS3491
±VCC
140
562
+VCC
49.9
50-Ÿ
Load
24.9
13 VPP max
available at
matched 50-Ÿ
load
THS3491
±VCC
Copyright © 2017, Texas Instruments Incorporated
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. ADVANCE INFORMATION for pre-production products; subject to
change without notice.