OPA837 Datasheet, PDF (1/51 Pages) Texas Instruments – OPA837 Low-Power, Precision, 105-MHz, Voltage-Feedback Op Amp

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OPA837
SBOS673 – SEPTEMBER 2017
OPA837 Low-Power, Precision, 105-MHz, Voltage-Feedback Op Amp
1 Features
•1 Bandwidth: 105 MHz (A_V = 1 V/V)
• Very Low (Trimmed) Supply Current: 600 µA
• Gain Bandwidth Product: 50 MHz
• Slew Rate: 105 V/µs
• Negative Rail Input, Rail-to-Rail Output
• 25°C Input Offset: ±130 µV (Max)
• Input Offset Voltage Drift (DCK Package):
< ±1.6 µV/°C (Maximum)
• Input Voltage Noise: 4.7 nV/√Hz (> 100 Hz)
• HD2: –120 dBc at 2 V_PP, 100 kHz
• HD3: –145 dBc at 2 V_PP, 100 kHz
• Settling Time: 35 ns, 0.5-V Step to 0.1%
• 5-µA Shutdown Current With Fast Recovery From
Shutdown for Power Scaling Applications
2 Applications
• 12-Bit to 16-Bit, Low-Power SAR Drivers
• Precision ADC Reference Buffers
• Very-Low-Power Active Filters
• Low-Power Transimpedance Amplifiers
• Sensor Signal Conditioning
• Wearable Devices
• Low-Side Current Sensing
3 Description
The OPA837 device is a unity-gain stable, voltage-
feedback op amp that provides among the highest
MHz per mW of bandwidth versus power among
precision op amps. Using only 600 µA on a single 5-V
supply, this 3.0-mW device delivers 105-MHz
bandwidth at a gain of 1 V/V. The very low trimmed
offset voltage of ±130 µV (maximum) comes with a
typical (±1σ) drift of ±0.4 µV/°C.
Ideally suited to single-ended, successive-
approximation register (SAR) analog-to-digital-
converter (ADC) driving applications, the OPA837
provides one of the lowest input spot noise levels at
4.7 nV/√Hz for the 3-mW quiescent power. The very
high 50-MHz gain bandwidth product provides the low
output impedance to high frequencies required to
supply the fast charging currents in SAR ADC driver
applications. This low dynamic output impedance is
also suitable for reference buffer applications with
precision ADCs. The single-channel OPA837 is
available in a 6-pin SOT-23 package (that includes a
power shutdown feature) and a 5-pin SC70 package.
The OPA837 is characterized for operation over the a
wide temperature range of –40°C to +125°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
OPA837
SOT-23 (6)
SC70 (5)
2.90 mm × 1.60 mm
2.00 mm × 1.25 mm
(1) For all available packages, see the package option addendum
at the end of the data sheet.
Low-Power, Low-Noise, Precision, Single-Ended SAR ADC Driver With
True Ground Input and Output Range
5.0 V
REF5040
4.096 V
+VCC
0V
0V
3.8 V
Gain = 1.05 V/V
+
PD
OPA837
±
±VCC
499 Ÿ
10.0 kŸ
GND
4.0 V
22 Ÿ
2.2 nF
22 Ÿ
GND
3.3 V
ADS8860
16-Bit SAR
1 SPS
GND
GND
±0.23 V
LM7705
3.3 V
Copyright © 2017, Texas Instruments Incorporated
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.