OPA838 Amp Datasheet

OPA838 Datasheet PDF, Equivalent


Part Number

OPA838

Description

Voltage-Feedback Op Amp

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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OPA838
SBOS867B – AUGUST 2017 – REVISED OCTOBER 2018
OPA838 1-mA, 300-MHz Gain Bandwidth, Voltage-Feedback Op Amp
1 Features
1 Gain Bandwidth Product: 300 MHz
• Very-Low (Trimmed) Supply Current: 950 µA
• Bandwidth: 90 MHz (AV = 6 V/V)
• High Full-Power Bandwidth: 45 MHz, 4 VPP
• Negative Rail Input, Rail-to-Rail Output
• Single-Supply Operating Range: 2.7 V to 5.4 V
• 25°C Input Offset: ±125 µV (Maximum)
• Input Offset Voltage Drift: < ±1.6 µV/°C
(Maximum)
• Input Voltage Noise: 1.8 nV/Hz (> 200 Hz)
• Input Current Noise: 1 pA/Hz (> 2000 Hz)
• < 1-µA Shutdown Current for Power Savings
2 Applications
• Low-Power Transimpedance Amplifiers
• Low-Noise High-Gain Stages
• 12-Bit to 16-Bit Low-Power SAR ADC Drivers
• High-Gain Active Filter Designs
• Ultrasonic Flow Meters
3 Description
The OPA838 decompensated voltage feedback
operational amplifier provides a high 300-MHz gain
bandwidth product with 1.8-nV/Hz input noise
voltage, requiring only a trimmed 0.95-mA supply
current. These features combine to provide an
extremely power-efficient solution for photodiode
transimpedance designs and high-voltage gain
stages, which require the lowest input voltage noise
in signal receiver applications.
Operating at the minimum recommended
noninverting gain of 6 V/V results in a 90-MHz, –3-dB
bandwidth. Extremely low input noise and offset
voltage make the OPA838 particularly suitable for
high gains. Even at a DC-coupled gain of 1000 V/V, a
300-kHz signal bandwidth is available with a
maximum output offset voltage of ±125 mV.
The single-channel OPA838 is available in 6-pin
SOT-23 and SC70 packages with a power shutdown
feature and a 5-pin SC70 package.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SOT-23 (6)
2.90 mm × 1.60 mm
OPA838
SC70 (5)
2.00 mm × 1.25 mm
SC70 (6)
2.00 mm × 1.25 mm
(1) For all available packages, see the package option addendum
at the end of the data sheet.
SPACE
SPACE
Single 3-V Supply, < 3-mW Photodiode Amplifier With
< 1.1-pA/Hz Total Input-Referred Current Noise and 100-kΩ Gain With Overall 1-MHz SSBW
1 pF
Large Area Photodetector
With 100-pF Capacitance
Diode
Current
Direction
-VBIAS
100 k
VCC = 3 V
± 73.2
+
VOUT
2.2 nF
1-MHz
Post Filter
1
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. PRODUCTION DATA.

OPA838
OPA838
SBOS867B – AUGUST 2017 – REVISED OCTOBER 2018
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 4
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics: VS = 5 V........................... 6
7.6 Electrical Characteristics: VS = 3 V........................... 8
7.7 Typical Characteristics: VS = 5 V ............................ 10
7.8 Typical Characteristics: VS = 3 V ............................ 13
7.9 Typical Characteristics: Over Supply Range .......... 16
8 Detailed Description ............................................ 20
8.1 Overview ................................................................. 20
8.2 Functional Block Diagram ....................................... 20
8.3 Feature Description................................................. 20
8.4 Device Functional Modes........................................ 24
8.5 Power Shutdown Operation .................................... 27
9 Application and Implementation ........................ 28
9.1 Application Information............................................ 28
10 Power Supply Recommendations ..................... 36
11 Layout................................................................... 37
11.1 Layout Guidelines ................................................. 37
11.2 Layout Example .................................................... 37
12 Device and Documentation Support ................. 38
12.1 Device Support .................................................... 38
12.2 Documentation Support ........................................ 38
12.3 Trademarks ........................................................... 39
12.4 Electrostatic Discharge Caution ............................ 39
12.5 Glossary ................................................................ 39
13 Mechanical, Packaging, and Orderable
Information ........................................................... 39
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (February 2018) to Revision B
Page
• Changed < 5-µA Shutdown Current to < 1-µA Shutdown Current in Features section ......................................................... 1
• Changed value of common-mode and differential-mode input impedance in Electrical Characterictics: VS = 5 V
and Electrical Characterictics: VS = 3 V tables....................................................................................................................... 7
• Changed value of power-down quiescent current in Electrical Characteristics: VS = 5 V and Electrical
Characteristics: VS = 3 V tables.............................................................................................................................................. 7
• Changed 5 µA to 1 µA in Overview section ........................................................................................................................ 20
• Changed standby current from 5 µA to 1 µA in Power-Down Operation section................................................................. 21
• Changed common-mode input capacitance from 1.3 pF to 1 pF in Trade-Offs in Selecting The Feedback Resistor
Value section ........................................................................................................................................................................ 22
• Changed 1 + 6.3 / 1.2 = 6.25 V/V, adding the 1.3-pF device common-mode capacitance to 1 + 6 / 1.2 = 6 V/V,
adding the 1-pF device common-mode capacitance in Trade-Offs in Selecting The Feedback Resistor Value section..... 22
• Changed 2 µA to 0.1 µA and 5 µA to 1 µA in last sentence of Power Shutdown Operation section .................................. 27
• Changed Power Supply Recommendations and Thermal Notes title to Power Supply Recommendations ....................... 36
Changes from Original (August 2017) to Revision A
Page
• Added OPA837 to the Device Comparison table ................................................................................................................... 4
• Changed Device Comparison table note................................................................................................................................ 4
• Changed format of pin names in pinout drawings in Pin Configuration and Functions section ............................................ 4
• Added DCK to pinout description in 6-pin SOT-23 and SC70 pinout drawing ....................................................................... 4
• Changed I/O column header to "TYPE" in Pin Configuration and Functions section ........................................................... 4
• Added table note to table to define pin types in Pin Configuration and Functions section ................................................... 4
• Added table note to Absolute Maximum Ratings table ......................................................................................................... 5
• Changed bandwidth for 0.1-dB flatness test condition from VOUT = 2 VPP and G = 10 to VOUT = 200 mVPP and G = 6
in the Electrical Characteristics: VS = 5 V table...................................................................................................................... 6
• Added values for VOH and VOL parameters at TA = -40 to +125°C in Electrical Characteristics: VS = 5 V table.................... 7
2 Submit Documentation Feedback
Product Folder Links: OPA838
Copyright © 2017–2018, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity OPA838 SBOS867B – AUGUST 2017 – REVISED OCTOBER 2018 OPA838 1-mA, 300-MHz Gain Bandwidth, Voltage-Feedbac k Op Amp 1 Features •1 Gain Bandwidt h Product: 300 MHz • Very-Low (Trimme d) Supply Current: 950 µA • Bandwidt h: 90 MHz (AV = 6 V/V) • High Full-Po wer Bandwidth: 45 MHz, 4 VPP • Negati ve Rail Input, Rail-to-Rail Output • Single-Supply Operating Range: 2.7 V to 5.4 V • 25°C Input Offset: ±125 µ V (Maximum) • Input Offset Voltage Dr ift: < ±1.6 µV/°C (Maximum) • Inpu t Voltage Noise: 1.8 nV/√Hz (> 200 Hz ) • Input Current Noise: 1 pA/√Hz ( > 2000 Hz) • < 1-µA Shutdown Current for Power Savings 2 Applications • L ow-Power Transimpedance Amplifiers • Low-Noise High-Gain Stages • 12-Bit t o 16-Bit Low-Power SAR ADC Drivers • High-Gain Active Filter Designs • Ult rasonic Flow Meters 3 Description The OPA838 decompensated voltage feedback operational amplifier provides a high 300-MHz gain bandwidth product with.
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