OPA847 Wideband, Ultra-Low Noise,Voltage Feedback Operational Amplifier with Shutdown | TI.com

OPA847 (ACTIVE)

Wideband, Ultra-Low Noise,Voltage Feedback Operational Amplifier with Shutdown

 

Description

The OPA847 combines very high gain bandwidth and large signal performance with an ultra-low input noise voltage (0.85nV/√Hz) while using only 18mA supply current. Where power saving is critical, the OPA847 also includes an optional power shutdown pin that, when pulled low, disables the amplifier and decreases the supply current to < 1% of the powered-up value. This optional feature may be left disconnected to ensure normal amplifier operation when no power-down is required.

The combination of very low input voltage and current noise, along with a 3.9GHz gain bandwidth product, make the OPA847 an ideal amplifier for wideband transimpedance applications. As a voltage gain stage, the OPA847 is optimized for a flat frequency response at a gain of +20V/V and is stable down to gains as low as +12V/V. New external compensation techniques allow the OPA847 to be used at any inverting gain with excellent frequency response control. Using this technique in a differential Analog-to-Digital Converter (ADC) interface application, shown below, can deliver one of the highest dynamic range interfaces available.

Features

  • HIGH GAIN BANDWIDTH: 3.9GHz
  • LOW INPUT VOLTAGE NOISE: 0.85nV/√Hz
  • VERY LOW DISTORTION: –105dBc (5MHz)
  • HIGH SLEW RATE: 950V/µs
  • HIGH DC ACCURACY: VIO < ±100µV
  • LOW SUPPLY CURRENT: 18.1mA
  • LOW SHUTDOWN POWER: 2mW
  • STABLE FOR GAINS 12
  • APPLICATIONS
    • HIGH DYNAMIC RANGE ADC PREAMPS
    • LOW NOISE, WIDEBAND, TRANSIMPEDANCE AMPLIFIERS
    • WIDEBAND, HIGH GAIN AMPLIFIERS
    • LOW NOISE DIFFERENTIAL RECEIVERS
    • ULTRASOUND CHANNEL AMPLIFIERS
    • IMPROVED UPGRADE FOR THE OPA687, CLC425, AND LMH6642

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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 1 kHz (Typ) (nV/rtHz)
Iq per channel (Typ) (mA)
Vos (offset voltage @ 25 C) (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
OPA847 OPA842 OPA843 OPA846
Bipolar
Voltage FB    
Bipolar
Voltage FB    
Bipolar
Voltage FB    
Bipolar
Voltage FB    
1     1     1     1    
10     7     8     10    
12     12     12     12    
600     350     500     500    
12     1     3     7    
950     400     1000     625    
0.85     2.7     2     1.2    
0.85     2.6     2     1.2    
18.1     20.2     20.2     12.6    
0.5     1.2     1.2     0.6    
No     No     No     No    
Decompensated    
   
Decompensated     Decompensated    
Catalog     Catalog     Catalog     Catalog    
-40 to 85     -40 to 85     -40 to 85     -40 to 85    
SOIC | 8
SOT-23 | 6    
SOIC | 8
SOT-23 | 5    
SOIC | 8
SOT-23 | 5    
SOIC | 8
SOT-23 | 5    
8SOIC: 29 mm2: 6 x 4.9 (SOIC | 8)
6SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 6)    
8SOIC: 29 mm2: 6 x 4.9 (SOIC | 8)
5SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 5)    
8SOIC: 29 mm2: 6 x 4.9 (SOIC | 8)
5SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 5)    
8SOIC: 29 mm2: 6 x 4.9 (SOIC | 8)
5SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 5)    
110     95     95     110    
39000000     35000000     35000000     19000000    
1.5     4     4     1.5    
3900     350     1500     1750    
75     100     100     80    
74     80     76     76    
100     97     102     109    
5     5     5     5    

Design tool

WEBENCH® Designer OPA847

Amplifier Topology
 Non-inverting
 Inverting
Desired Power Supply Voltage
Positive Supply (Vcc):  V
Negative Supply (Vee):  V
Allowed Power Supply(Vcc-Vee) = 10.0 to 12.0 V
Desired Input and Output Requirements
  Min Max
Vin  V  V
Vout  V  V
Minimum Temperature = -40.0 °C
Maximum Temperature = 85.0 °C