Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Voltage feedback SOIC 14

FEATURES

D HIGH BANDWIDTH: 220MHz (G = +2)

D HIGH OUTPUT CURRENT: ±85mA

D LOW INPUT NOISE: 2.5nV/√Hz

D LOW SUPPLY CURRENT: 5.7mA/ch

D FLEXIBLE SUPPLY VOLTAGE:

±2V to ±6.3V Dual Supply

+4V to +12.6V Single Supply

D EXCELLENT DC ACCURACY:

Maximum 25°C Input Offset Voltage = 0.8mV

Maximum 25°C Input Offset Current = 500nA

APPLICATIONS

D LOW-COST VIDEO LINE DRIVERS

D ADC PREAMPS

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 OPA4650 UPGRADE

DESCRIPTION

The OPA4820 provides a wideband, unity-gain stable,

voltage-feedback amplifier with a very low input noise

voltage and high output current using a low 5.7mA/ch

supply current. At unity-gain, the OPA4820 gives

> 600MHz bandwidth with < 1 dB peaking. The OPA4820

complements this high-speed operation with excellent DC

precision in a low-power device. A worst-case input offset

voltage of ±0.8mV and an offset current of ±500nA give

excellent absolute DC precision for pulse amplifier

applications.

Minimal input and output voltage swing headroom allow

the OPA4820 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 quad pinout SO-14 package

while emerging high-density portable applications can use

the TSSOP-14.

Summary of content (34 pages)

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OPA4820 SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 Quad, Unity-Gain Stable, Low-Noise, Voltage-Feedback Operational Amplifier FEATURES D D D D D D DESCRIPTION HIGH BANDWIDTH: 220MHz (G = +2) HIGH OUTPUT CURRENT: ±85mA LOW INPUT NOISE: 2.5nV/√Hz LOW SUPPLY CURRENT: 5.7mA/ch FLEXIBLE SUPPLY VOLTAGE: ±2V to ±6.3V Dual Supply +4V to +12.6V Single Supply EXCELLENT DC ACCURACY: Maximum 25°C Input Offset Voltage = 0.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ABSOLUTE MAXIMUM RATINGS(1) Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±6.5V Internal Power Dissipation . . . . . . . . .
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 ELECTRICAL CHARACTERISTICS: VS = ±5V Boldface limits are tested at +25°C. At RF = 402Ω, RL = 100Ω, and GND = +2, unless otherwise noted. OPA4820ID, IPW TYP PARAMETER AC PERFORMANCE Small-Signal Bandwidth Gain-Bandwidth Product Peaking at a Gain of 1 Bandwidth for 0.1dB Gain Flatness Large-Signal Bandwidth Slew Rate Rise Time and Fall TIme Settling Time to 0.02% Settling Time to 0.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 ELECTRICAL CHARACTERISTICS: VS = +5V Boldface limits are tested at +25°C. At RF = 402Ω, RL = 100Ω to 2.5V, and G = +2, unless otherwise noted. OPA4820ID, IPW TYP PARAMETER AC PERFORMANCE Small-Signal Bandwidth Gain-Bandwidth Product Peaking at a Gain of 1 Large-Signal Bandwidth Slew Rate Rise Time and Fall Time Settling Time to 0.02% Settling Time to 0.
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"#$% www.ti.com SBOS317D − SEPTEMBER 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 3 G = +1, RF = 25Ω G = −1 0 Normalized Gain (dB) −3 G = +5 G = +2 −6 G = +10 −9 −12 VO = 0.1VPP RL = 100Ω See Figure 1 −15 −18 1M −3 −6 G = −10 −9 −12 VO = 0.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = ±5V (continued) RF = 402Ω, RL = 100Ω, and G = +2, unless otherwise noted.
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"#$% www.ti.com SBOS317D − SEPTEMBER 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 100 45 Intercept Point (+dBm) Voltage Noise (nV/√Hz) Current Noise (pA/√Hz) PI 1 /4 50Ω 40 10 Voltage Noise (2.5nV/√Hz) PO OP A4820 200Ω 402 Ω 35 402 Ω 30 25 20 Current Noise (1.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = ±5V (continued) RF = 402Ω, RL = 100Ω, and G = +2, unless otherwise noted. OUTPUT VOLTAGE AND CURRENT LIMITATIONS Output Current Power Limit Limit 3 RL = 100Ω 2 VO (V) 10 1 RL = 25Ω 0 RL = 50Ω −1 −2 −3 Output Current −4 Single Channel −100 0.1 1W Internal Limit −5 −150 1 Power Limit 0.
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"#$% www.ti.com SBOS317D − SEPTEMBER 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 26 24 Total Supply Current Right Scale Sourcing Output Current Left Scale 90 22 80 20 Sinking Output Current Left Scale 70 −50 −25 0 25 +VIN 4 −VIN 3 +VOUT 2 −VOUT 1 50 75 100 18 125 0 2.5 Ambient Temperature (_ C) 3.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = +5V RF = 402Ω, RL = 100Ω to VS/2, and G = +2, unless otherwise noted. NONINVERTING SMALL−SIGNAL FREQUENCY RESPONSE 3 INVERTING SMALL−SIGNAL FREQUENCY RESPONSE 3 G = +1, RF = 25Ω G = −1 0 −3 G = +5 −6 Normalized Gain (dB) G = +2 G = +10 −9 −12 VO = 0.1VPP RL = 100Ω See Figure 3 −15 −18 1 −3 G = −10 −9 −12 VO = 0.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = +5V (continued) RF = 402Ω, RL = 100Ω to VS/2, and G = +2, unless otherwise noted.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 TYPICAL CHARACTERISTICS: VS = +5V (continued) RF = 402Ω, RL = 100Ω to VS/2, and G = +2, unless otherwise noted. RECOMMENDED RS vs CAPACITIVE LOAD FREQUENCY RESPONSE vs CAPACITIVE LOAD Normalized Gain to Capacitive Load (dB) 100 10 1 1 10 100 1000 C L = 10pF 7 6 5 CL = 22pF 4 CL = 47pF 3 CL = 100pF 2 +5V 0.01µF 1 806Ω RS VI 57.6Ω 0 806Ω CL −1 402Ω −2 −3 1 10 Input Offset Voltage (VOS) Left Scale 0 −0.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 APPLICATIONS INFORMATION +5V WIDEBAND VOLTAGE-FEEDBACK OPERATION Figure 1 shows the gain of +2 configuration used as the basis for most of the Typical Characteristics. Most of the curves were characterized using signal sources with 50Ω driving impedance and with measurement equipment presenting 50Ω load impedance.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 WIDEBAND SINGLE-SUPPLY OPERATION while delivering more than 60mA output current giving 2.4V output swing into 100Ω (5.6dBm maximum at a matched 50Ω load). Figure 3 shows the AC-coupled, single +5V supply, gain of +2V/V circuit configuration used as a basis for the +5V only Electrical and Typical Characteristics.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 DIFFERENTIAL INTERFACE APPLICATIONS Dual and quad op amps are particularly suitable to differential input to differential output applications. Typically, these fall into either ADC input interface or line driver applications. Two basic approaches to differential I/O are noninverting or inverting configurations.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 DC-COUPLED SINGLE-TO-DIFFERENTIAL CONVERSION stage, creating no current flow and placing the desired VCM at the output of this stage as well. Both the positive and negative output are shown in Figure 8. The previous differential output circuits were set up to receive a differential input as well as provide a differential output.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 3.0 VIN = 0V to 0.5V RG = 402Ω +VOUT 2.5 Voltage (V) 2.0 1.5 1.0 −VOUT 0.5 0 Time (10ns/div) Figure 8. Pulse Response for Figure 7 Schematic 100pF 100pF +5V 161Ω 77Ω 121Ω 294Ω VO/VI = 4V/V 1/4 OPA4820 1/4 OPA4820 250Ω VI 50pF 500Ω 250Ω 161Ω VO 250Ω 1/4 OPA4820 121Ω PD = 225mW 250Ω 500Ω 50pF f−3dB = 10MHz 77Ω 100pF 294Ω 1/4 OPA4820 100pF GD = 2, ωO = 2π 10MHz, Q = 1.31 −5V GD = 2, ωO = 2π 10MHz, Q = 0.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 The differential receiver is configured as an inverting summing stage where the outputs of the driver are cancelled prior to appearing at the output of the receive amplifiers. This is done by summing the output voltages for the drive amplifiers and their attenuated and inverted levels (at the transformer input) into the inverting inputs of each receiver amplifier.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 +5V 1kΩ VCM 0.1µF 1kΩ 1/4 OPA4820 Dual ADC 500Ω 1:2 50Ω Source 200Ω 800Ω RS 200Ω 800Ω RS 16.7dB Noise Figure CL 1 of 2 Channels 1/4 OPA4820 Gain = 8V/V 18dB 500Ω VCM Figure 11.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 Usually, it is best to set the absolute values of R2 and R1 equal to RF and RG, respectively; this equalizes the divider resistances and cancels the effect of input bias currents. However, it is sometimes useful to scale the values of R2 and R1 in order to adjust the loading on the driving source, V1. In most cases, the achievable low-frequency CMRR will be limited by the accuracy of the resistor values.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 Another type of filter, a high-Q bandpass filter, is shown in Figure 16. The transfer function for this filter is: R )R s R 3R C4 V OUT 1 4 1 + 1 V IN 2 s ) sR C ) R 1 1 with and R3 (5) 2R 4R 5C 1C 2 R3 w O2 + R 2R 4R 5C 1C 2 wO + 1 Q R 1C 1 (6) and DEMONSTRATION FIXTURES Two printed circuit boards (PCBs) are available to assist in the initial evaluation of circuit performance using the OPA4820 in its two package options.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 response. Assuming a 2pF total parasitic on the inverting node, holding RF || RG < 200Ω will keep this pole above 400MHz. By itself, this constraint implies that the feedback resistor RF can increase to several kΩ at high gains. This is acceptable as long as the pole formed by RF and any parasitic capacitance appearing in parallel is kept out of the frequency range of interest.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 DISTORTION PERFORMANCE The OPA4820 is capable of delivering an exceptionally low distortion signal at high frequencies and low gains. The distortion plots in the Typical Characteristics show the typical distortion under a wide variety of conditions. Most of these plots are limited to 100dB dynamic range. The OPA4820 distortion does not rise above −90dBc until either the signal level exceeds 0.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 THERMAL ANALYSIS The OPA4820 will not require heatsinking or airflow in most applications. Maximum desired junction temperature would set the maximum allowed internal power dissipation as described below. In no case should the maximum junction temperature be allowed to exceed +150°C. Operating junction temperature (TJ) is given by TA + PD × qJA.
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"#$% www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 d) Connections to other wideband devices on the board may be made with short direct traces or through onboard transmission lines. For short connections, consider the trace and the input to the next device as a lumped capacitive load. Relatively wide traces (50mils to 100mils) should be used, preferably with ground and power planes opened up around them.
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www.ti.com SBOS317D − SEPTEMBER 2004 − REVISED AUGUST 2008 Revision History DATE REV PAGE SECTION 8/08 D 2 Absolute Maximum Ratings 21 Design-In Tools 6/06 C 26 Application Information DESCRIPTION Changed Storage Temperature minimum value from −40°C to −65°C. Demonstration fixture numbers changed. Added Revision History table. 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 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) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant OPA4820IDR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1 OPA4820IPWR TSSOP PW 14 2500 330.0 12.4 6.9 5.6 1.6 8.0 12.0 Q1 OPA4820IPWT TSSOP PW 14 250 180.0 12.4 6.9 5.6 1.6 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) OPA4820IDR SOIC D 14 2500 367.0 367.0 38.0 OPA4820IPWR TSSOP PW 14 2500 367.0 367.0 35.0 OPA4820IPWT TSSOP PW 14 250 210.0 185.0 35.
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