THS3491 900-MHz, High Power Output, Current Feedback Amplifier | TI.com

THS3491 (ACTIVE)

900-MHz, High Power Output, Current Feedback Amplifier

900-MHz, High Power Output, Current Feedback Amplifier - THS3491
 

Description

The THS3491 current feedback amplifier (CFA) provides a new level of performance for applications requiring the lowest distortion at high output power levels from DC through values greater than 100 MHz at 100-Ω loads. Although specified at a gain of 5 V/V, this current feedback design holds near constant bandwidth and distortion over a wide range of gains.

The 8000 V/µs of slew rate delivers an output of 10 VPP into demanding loads with low distortion through 100 MHz. The 900-MHz, small-signal bandwidth delivers a low overshoot of less than 1.5% for a 10-V step, and rise and fall times of less than 1.3 ns. Peak output current drive values greater than 500 mA enable driving heavy capacitive loads with fast signals.

New designs benefit from the lowest distortion using the VQFN-16 (RGT) package, whereas the 8-pin HSOIC (DDA) package (with PowerPAD™) upgrades existing THS3091 or THS3095 designs. Lower output headroom for the THS3491 provides more output swing on the same ±15-V supplies versus legacy THS3091 or THS3095 options.

Features

  • Bandwidth:
    • 900 MHz (VO = 2 VPP, AV = 5 V/V)
    • 320 MHz (VO = 10 VPP, AV = 5 V/V)
  • Slew Rate: 8000 V/µs (VO = 20 VPP)
  • Input Voltage Noise: 1.7 nV/√Hz
  • Bipolar Supply Range: ±7 V to ±16 V
  • Single-Supply Range: 14 V to 32 V
  • Output Swing: 28 VPP (±16-V Supplies, 100-Ω Load)
  • Linear Output Current: ±420 mA (Typical)
  • 16.8-mA Trimmed Supply Current (Low Temperature Coefficient)
  • HD2 and HD3: Less Than –75 dBc (50 MHz, VO = 10 VPP, 100-Ω Load)
  • Rise and Fall Time: 1.3 ns (10-V Step)
  • Overshoot: 1.5% (10-V Step, AV = 5 V/V)
  • Current Limit and Thermal Shutdown Protection
  • Power Down Feature

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Parametrics Compare all products in High-Speed Op Amps (GBW>=50MHz)

 
Architecture
Number of Channels (#)
Total Supply Voltage (Min) (+5V=5, +/-5V=10)
Total Supply Voltage (Max) (+5V=5, +/-5V=10)
BW @ Acl (MHz)
Acl, min spec gain (V/V)
Slew Rate (Typ) (V/us)
Vn at Flatband (Typ) (nV/rtHz)
Vn at 1kHz (Typ) (nV/rtHz)
Iq per channel (Typ) (mA)
Vos (Offset Voltage @ 25C) (Max) (mV)
Rail-to-Rail
Features
Rating
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
CMRR (Typ) (dB)
Input Bias Current (Max) (pA)
Offset Drift (Typ) (uV/C)
GBW (Typ) (MHz)
Output Current (Typ) (mA)
2nd Harmonic (dBc)
3rd Harmonic (dBc)
@ MHz
THS3491 THS3091 THS3095
Current FB     Bipolar
Current FB    
Bipolar
Current FB    
1     1     1    
14     10     10    
32     30     30    
900     235     235    
1     1     1    
8000     7300     7300    
1.85     2     2    
3     2     2    
17.1     9.5     9.5    
2     3     3    
No     No     No    
Shutdown     N/A     Shutdown    
Catalog     Catalog     Catalog    
-40 to 85     -40 to 85     -40 to 85    
SO PowerPAD
VQFN    
SO PowerPAD
SOIC    
SO PowerPAD
SOIC    
8SO PowerPAD: 19 mm2: 3.9 x 4.89(SO PowerPAD)
16VQFN: 9 mm2: 3 x 3(VQFN)    
8SO PowerPAD: 19 mm2: 3.9 x 4.89(SO PowerPAD)
8SOIC: 29 mm2: 6 x 4.9(SOIC)    
8SO PowerPAD: 19 mm2: 3.9 x 4.89(SO PowerPAD)
8SOIC: 29 mm2: 6 x 4.9(SOIC)    
75     69     69    
5000000     15000000     15000000    
3     10     10    
900     235     235    
420     250     250    
76     66     66    
69     74     74    
50     10     10    

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