Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Voltage feedback SOT 23 5

FEATURES

D HIGH BANDWIDTH (240MHz, G = +2)

D HIGH OUTPUT CURRENT (±110mA)

D LOW INPUT NOISE (2.5nV/√Hz)

D LOW SUPPLY CURRENT (5.6mA)

D FLEXIBLE SUPPLY VOLTAGE:

Dual ±2.5V to ±6V

Single +5V to +12V

D EXCELLENT DC ACCURACY:

Maximum 25°C Input Offset Voltage = ±750µV

Maximum 25°C Input Offset Current = ±400nA

APPLICATIONS

D LOW-COST VIDEO LINE DRIVERS

D ADC PREAMPLIFIERS

D ACTIVE FILTERS

D LOW-NOISE INTEGRATORS

D PORTABLE TEST EQUIPMENT

D OPTICAL CHANNEL AMPLIFIERS

D LOW-POWER, BASEBAND AMPLIFIERS

D CCD IMAGING CHANNEL AMPLIFIERS

D OPA650 AND OPA620 UPGRADE

DESCRIPTION

The OPA820 provides a wideband, unity-gain stable,

voltage-feedback amplifier with a very low input noise voltage

and high output current using a low 5.6mA supply current. At

unity-gain, the OPA820 gives > 800MHz bandwidth with < 1dB

peaking. The OPA820 complements this high-speed

operation with excellent DC precision in a low-power device.

A worst-case input offset voltage of ±750µV and an offset

current of ±400nA give excellent absolute DC precision for

pulse amplifier applications.

Minimal input and output voltage swing headroom allow the

OPA820 to operate on a single +5V supply with > 2V

output

swing. While not a rail-to-rail (RR) output, this swing will

support most emerging analog-to-digital converter (ADC)

input ranges with lower power and noise than typical RR

output op amps.

Exceptionally low dG/dP (0.01%/0.03°) supports low-cost

composite video line driver applications. Existing designs can

use the industry-standard pinout SO-8 package while

emerging high-density portable applications can use the

SOT23-5. Offering the industry’s lowest thermal impedance in

a SOT package, along with full specification over both the

commercial and industrial temperature ranges, gives solid

performance over a wide temperature range.

Summary of content (32 pages)

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OPA820 SBOS303C − JUNE 2004 − REVISED AUGUST 2008 Unity-Gain Stable, Low-Noise, Voltage-Feedback Operational Amplifier FEATURES D D D D D D DESCRIPTION HIGH BANDWIDTH (240MHz, G = +2) HIGH OUTPUT CURRENT (±110mA) LOW INPUT NOISE (2.5nV/√Hz) LOW SUPPLY CURRENT (5.6mA) FLEXIBLE SUPPLY VOLTAGE: Dual ±2.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ABSOLUTE MAXIMUM RATINGS(1) Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±6.5VDC Internal Power Dissipation . . . . . . . . . . . . See Thermal Information Differential Input Voltage .
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 ELECTRICAL CHARACTERISTICS: VS = ±5V Boldface limits are tested at +25°C. RF = 402Ω, RL = 100Ω, and G = +2, unless otherwise noted. OPA820ID, IDBV TYP PARAMETER AC PERFORMANCE Small-Signal Bandwidth Gain-Bandwidth Product Bandwidth for 0.1dB Gain Flatness Peaking at a Gain of +1 Large-Signal Bandwidth Slew Rate Rise Time and Fall Time Settling Time to 0.02% to 0.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 ELECTRICAL CHARACTERISTICS: VS = +5V Boldface limits are tested at +25°C. RF = 402Ω, RL = 100Ω, and G = +2, unless otherwise noted. OPA820ID, IDBV TYP PARAMETER AC PERFORMANCE Small-Signal Bandwidth Gain-Bandwidth Product Peaking at a Gain of 1 Large-Signal Bandwidth Slew Rate Rise Time and Fall Time Settling Time to 0.02% to 0.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = ±5V RF = 402Ω, RL = 100Ω, and G = +2, unless otherwise noted. NONINVERTING SMALL−SIGNAL FREQUENCY RESPONSE 3 0 G = −1 0 G = +5 −3 Normalized Gain (dB) G = +2 −6 G = +10 −9 −12 VO = 0.1VPP RL = 100Ω See Figure 1 −15 G = −2 −3 G = −5 −6 −9 G = −10 −12 VO = 0.1VPP RL = 100Ω See Figure 2 −15 −18 −18 1M 10M 100M 1G 1 10 Frequency (Hz) NONINVERTING LARGE−SIGNAL FREQUENCY RESPONSE 9 VO = 0.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = ±5V (continued) RF = 402Ω, RL = 100Ω, and G = +2, unless otherwise noted. HARMONIC DISTORTION vs LOAD RESISTANCE f = 1MHz VO = 2VPP G = +2V/V −75 −80 2nd−Harmonic −85 −90 3rd−Harmonic −95 See Figure 1 −100 100 1MHz HARMONIC DISTORTION vs SUPPLY VOLTAGE −75 Harmonic Distortion (dBc) Harmonic Distortion (dBc) −70 −80 2nd−Harmonic −85 −90 3rd−Harmonic −95 −100 See Figure 1 −105 2.5 1k 3.0 3.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = ±5V (continued) RF = 402Ω, RL = 100Ω, and G = +2, unless otherwise noted. TWO−TONE, 3RD−ORDER INTERMODULATION INTERCEPT INPUT VOLTAGE AND CURRENT NOISE 50 100 PI 10 Voltage Noise (2.5nV/√Hz) PO O P A 82 0 5 0Ω 2 00 Ω Intercept Point (+dBm) Voltage Noise (nV/√Hz) Current Noise (pA/√Hz) 45 40 40 2Ω 40 2Ω 35 30 25 20 Current Noise (1.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = ±5V (continued) RF = 402Ω, RL = 100Ω, and G = +2, unless otherwise noted. OUTPUT VOLTAGE AND CURRENT LIMITATIONS Output Current Power Limit Limit 3 1 Output Impedance (Ω) RL = 100Ω 2 VO (V) 10 RL = 25Ω 0 RL = 50Ω −1 −2 −3 Output Current −4 0.1 1W Internal Limit −5 −150 1 Power Limit −100 0.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = ±5V (continued) RF = 402Ω, RL = 100Ω, and G = +2, unless otherwise noted. COMMON−MODE INPUT RANGE AND OUTPUT SWING vs SUPPLY VOLTAGE SUPPLY AND OUTPUT CURRENT vs TEMPERATURE 12 5 Left Scale 9 75 6 Supply Current Right Scale 50 3 Voltage Range (V) Sink/Source Output Current 100 6 Supply Current (mA) Output Current (mA) 125 +VIN 4 −VIN 3 +VOUT 2 −VOUT 1 25 −50 −25 0 25 50 75 100 0 125 0 2.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = +5V RF = 402Ω, RL = 100Ω, and G = +2, unless otherwise noted. NONINVERTING SMALL−SIGNAL FREQUENCY RESPONSE 3 INVERTING SMALL−SIGNAL FREQUENCY RESPONSE G = +1 G = +2 −3 Normalized Gain (dB) G = +5 −6 G = +10 −9 −12 VO = 0.1VPP RL = 100Ω See Figure 3 −15 G = −1 0 G = −2 −3 G = −5 −6 G = −10 −9 −12 VO = 0.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = +5V (continued) RF = 402Ω, RL = 100Ω, and G = +2, unless otherwise noted. HARMONIC DISTORTION vs FREQUENCY HARMONIC DISTORTION vs LOAD RESISTANCE f = 1MHz VO = 2VPP G = +2V/V 2nd−Harmonic −80 −60 Harmonic Distortion (dBc) Harmonic Distortion (dBc) −75 −85 −90 −95 3rd−Harmonic −100 G = +2V/V R L = 200Ω VO = 2VPP −70 −80 −90 3rd−Harmonic −100 See Figure 3 −105 100 2nd−Harmonic See Figure 3 −110 1k 0.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = +5V (continued) RF = 402Ω, RL = 100Ω, and G = +2, unless otherwise noted. FREQUENCY RESPONSE vs CAPACITIVE LOAD RECOMMENDED RS vs CAPACITIVE LOAD Normalized Gain to Capacitive Load (dB) 100 10 1 1 10 100 CL = 10pF 7 6 5 CL = 22pF 4 CL = 47pF 3 CL = 100pF 2 +5V 0.01µF 1 806Ω RS VI 57.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 APPLICATIONS INFORMATION +5V WIDEBAND VOLTAGE-FEEDBACK OPERATION 0.1µF RT 205Ω 0.01µF 50Ω Source +5V +VS + 0.1µF 2.2µF 50Ω Source VIN RS 50Ω Load 50Ω VO 50Ω OPA820 RF 402Ω RG 402Ω 0.1µF 2.2µF + −VS −5V Figure 1.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 WIDEBAND SINGLE-SUPPLY OPERATION Figure 4 shows the AC-coupled, single +5V supply, gain of −1V/V circuit configuration used as a basis for the +5V only Typical Characteristic curves. In this case, the midpoint DC bias on the noninverting input is also decoupled with an additional 0.01µF decoupling capacitor. This reduces the source impedance at higher frequencies for the noninverting input bias current noise. This 2.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 BUFFERING HIGH-PERFORMANCE ADCs To achieve full performance from a high dynamic range ADC, considerable care must be exercised in the design of the input amplifier interface circuit. The example circuit on the front page shows a typical AC-coupled interface to a very high dynamic range converter. This AC-coupled example allows the OPA820 to be operated using a signal range that swings symmetrically around ground (0V).
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 SINGLE OP AMP DIFFERENTIAL AMPLIFIER The voltage-feedback architecture of the OPA820, with its high common-mode rejection ratio (CMRR), will provide exceptional performance in differential amplifier configurations. Figure 6 shows a typical configuration. The starting point for this design is the selection of the RF value in the range of 200Ω to 2kΩ.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 C1 150pF VO = ID RF OPA820 +5V High−Speed DAC R1 124Ω RF R2 505Ω V1 C2 100pF CF CD ID VO OPA820 RF 402Ω GBP →Gain Bandwidth Product (Hz) for the OPA820. Power−supply decoupling not shown. −5V RG 402Ω ID Figure 9. 5MHz Butterworth Low-Pass Active Filter Figure 8. Wideband, Low-Distortion DAC Transimpedance Amplifier Another type of filter, a high-Q bandpass filter, is shown in Figure 10.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 Gain (dB) OPERATING SUGGESTIONS OPTIMIZING RESISTOR VALUES 6 0 −6 −12 −18 −24 −30 −36 −42 −48 −54 −60 −66 −72 100k 1M 10M 100M Frequency (Hz) Figure 11. High-Q 1MHz Bandpass Filter Frequency Response DESIGN-IN TOOLS DEMONSTRATION FIXTURES Two printed circuit boards (PCBs) are available to assist in the initial evaluation of circuit performance using the OPA820 in its two package options.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 Increasing the gain will cause the phase margin to approach 90° and the bandwidth to more closely approach the predicted value of (GBP/NG). At a gain of +10, the 30MHz bandwidth shown in the Electrical Characteristics agrees with that predicted using the simple formula and the typical GBP of 280MHz. OUTPUT DRIVE CAPABILITY The OPA820 has been optimized to drive the demanding load of a doubly-terminated transmission line.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 NOISE PERFORMANCE The OPA820 complements its low harmonic distortion with low input noise terms. Both the input-referred voltage noise and the two input-referred current noise terms combine to give a low output noise under a wide variety of operating conditions. Figure 12 shows the op amp noise analysis model with all the noise terms included.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 b) Minimize the distance (< 0.25”) from the power-supply pins to high-frequency 0.1µF decoupling capacitors. At the device pins, the ground and power-plane layout should not be in close proximity to the signal I/O pins. Avoid narrow power and ground traces to minimize inductance between the pins and the decoupling capacitors. The power-supply connections should always be decoupled with these capacitors. Larger (2.2µF to 6.
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"#$ www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 INPUT AND ESD PROTECTION The OPA820 is built using a very high-speed complementary bipolar process. The internal junction breakdown voltages are relatively low for these very small geometry devices. These breakdowns are reflected in the Absolute Maximum Ratings table. All device pins are protected with internal ESD protection diodes to the power supplies, as shown in Figure 13.
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www.ti.com SBOS303C − JUNE 2004 − REVISED AUGUST 2008 Revision History DATE REV PAGE SECTION 8/08 C 2 Absolute Maximum Ratings 3/06 B 18 Design-In Tools DESCRIPTION Changed Storage Temperature minimum value from −40°C to −65°C. Board part number changed. NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 (4) Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Top-Side Marking for that device. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) OPA820IDBVR SOT-23 DBV 5 3000 180.0 OPA820IDBVT SOT-23 DBV 5 250 OPA820IDR SOIC D 8 2500 B0 (mm) K0 (mm) P1 (mm) 8.4 3.2 3.1 1.39 4.0 180.0 8.4 3.2 3.1 1.39 330.0 12.4 6.4 5.2 2.1 Pack Materials-Page 1 W Pin1 (mm) Quadrant 8.0 Q3 4.0 8.0 Q3 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) OPA820IDBVR SOT-23 DBV 5 3000 210.0 185.0 35.0 OPA820IDBVT SOT-23 DBV 5 250 210.0 185.0 35.0 OPA820IDR SOIC D 8 2500 367.0 367.0 35.
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