Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Transimpedance VSSOP 8

FEATURES

D > 1MHz TRANSIMPEDANCE BANDWIDTH

D EXCELLENT LONG-TERM V

STABILITY

D BIAS CURRENT: 50pA (max)

D OFFSET VOLTAGE: 25µV (max)

D DYNAMIC RANGE: 4 to 5 Decades

D DRIFT: 0.1µV/°C (max)

D GAIN BANDWIDTH: 90MHz

D QUIESCENT CURRENT: 7.5mA

D SUPPLY RANGE: 2.7V to 5.5V

D SINGLE AND DUAL VERSIONS

D MicroSize PACKAGE: MSOP-8

APPLICATIONS

D PHOTODIODE MONITORING

D PRECISION I/V CONVERSION

D OPTICAL AMPLIFIERS

D CAT-SCANNER FRONT-END

1MΩ

100kΩ

+5V

OPA380

67pF

75pF

−5V

(Optional

Pulldown

Resistor)

OUT

(0V to 4.4V)

Photodiode

DESCRIPTION

The OPA380 family of transimpedance amplifiers provides

high-speed (90MHz Gain Bandwidth [GBW]) operation, with

extremely high precision, excellent long-term stability, and

very low 1/f noise. It is ideally suited for high-speed

photodiode applications. The OPA380 features an offset

voltage of 25µV, offset drift of 0.1µV/°C, and bias current of

50pA. The OPA380 far exceeds the offset, drift, and noise

performance that conventional JFET op amps provide.

The signal bandwidth of a transimpedance amplifier depends

largely on the GBW of the amplifier and the parasitic

capacitance of the photodiode, as well as the feedback

resistor. The 90MHz GBW of the OPA380 enables a trans-

impedance bandwidth of > 1MHz in most configurations. The

OPA380 is ideally suited for fast control loops for power level

on an optical fiber.

As a result of the high precision and low-noise characteristics

of the OPA380, a dynamic range of 4 to 5 decades can be

achieved. For example, this capability allows the

measurement of signal currents on the order of 1nA, and up

to 100µA in a single I/V conversion stage. In contrast to

logarithmic amplifiers, the OPA380 provides very wide

bandwidth throughout the full dynamic range. By using an

external pull-down resistor to –5V, the output voltage range

can be extended to include 0V.

The OPA380 (single) is available in MSOP-8 and SO-8

packages. The OPA2380 (dual) is available in the

miniature MSOP-8 package. They are specified from

–40°C to +125°C.

OPA380 RELATED DEVICES

PRODUCT FEATURES

OPA300 150MHz CMOS, 2.7V to 5.5V Supply

OPA350 500µV V

, 38MHz, 2.5V to 5V Supply

OPA335 10µV V

, Zero-Drift, 2.5V to 5V Supply

OPA132 16MHz GBW, Precision FET Op Amp, ±15V

OPA656/7 230MHz, Precision FET, ±5V

LOG112 LOG amp, 7.5 decades, ±4.5V to ±18V Supply

LOG114 LOG amp, 7.5 decades, ±2.25V to ±5.5V Supply

IVC102 Precision Switched Integrator

DDC112 Dual Current Input, 20-Bit ADC

OPA380

OPA2380

SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007

Precision, High-Speed

Transimpedance Amplifier

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Summary of content (23 pages)

PAGE 1
OPA380 OPA2380 SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 Precision, High-Speed Transimpedance Amplifier FEATURES D D D D D D D D D D D DESCRIPTION > 1MHz TRANSIMPEDANCE BANDWIDTH EXCELLENT LONG-TERM VOS STABILITY BIAS CURRENT: 50pA (max) OFFSET VOLTAGE: 25µV (max) DYNAMIC RANGE: 4 to 5 Decades DRIFT: 0.1µV/°C (max) GAIN BANDWIDTH: 90MHz QUIESCENT CURRENT: 7.5mA SUPPLY RANGE: 2.7V to 5.
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"#$ %"#$ www.ti.com SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 ABSOLUTE MAXIMUM RATINGS(1) ELECTROSTATIC DISCHARGE SENSITIVITY Voltage Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V Signal Input Terminals(2), Voltage . . . . . . . . . . −0.5V to (V+) + 0.5V Current . . . . . . . . . . . . . . . . . . . . . ±10mA Short-Circuit Current(3) . . . . . . . . . . . . . . . . . . . . . . . . . Continuous Operating Temperature Range . . . . . . . . . . . .
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"#$ %"#$ www.ti.com SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 ELECTRICAL CHARACTERISTICS: OPA380 (SINGLE), VS = 2.7V to 5.5V Boldface limits apply over the temperature range, TA = −40°C to +125°C. All specifications at TA = +25°C, RL = 2kΩ connected to VS/2, and VOUT = VS/2, unless otherwise noted.
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"#$ %"#$ www.ti.com SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 ELECTRICAL CHARACTERISTICS: OPA2380 (DUAL), VS = 2.7V to 5.5V Boldface limits apply over the temperature range, TA = −40°C to +125°C. All specifications at TA = +25°C, RL = 2kΩ connected to VS/2, and VOUT = VS/2, unless otherwise noted.
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"#$ %"#$ www.ti.com SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 TYPICAL CHARACTERISTICS: VS = +2.7V to +5.5V All specifications at TA = +25°C, RL = 2kΩ connected to VS/2, and VOUT = VS/2, unless otherwise noted.
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"#$ %"#$ www.ti.com SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 TYPICAL CHARACTERISTICS: VS = +2.7V to +5.5V (continued) All specifications at TA = +25°C, RL = 2kΩ connected to VS/2, and VOUT = VS/2, unless otherwise noted. INPUT BIAS CURRENT vs INPUT COMMON−MODE VOLTAGE OUTPUT VOLTAGE SWING vs OUTPUT CURRENT (V+) 25 (V+) −1 15 10 Output Swing (V) Input Bias Current (pA) 20 −IB 5 0 −5 +IB −10 −15 (V+) −2 +125_C +25_ C −40_ C (V−) +2 (V−) +1 −20 −25 (V−) 0 0.5 1.0 1.5 2.
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"#$ %"#$ www.ti.com SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 TYPICAL CHARACTERISTICS: VS = +2.7V to +5.5V (continued) All specifications at TA = +25°C, RL = 2kΩ connected to VS/2, and VOUT = VS/2, unless otherwise noted. TRANSIMPEDANCE AMP CHARACTERISTIC 140 Transimpedance Gain (V/A in dB) Circuit for Transimpedance Amplifier Characteristic curves on this page.
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"#$ %"#$ www.ti.com SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 TYPICAL CHARACTERISTICS: VS = +2.7V to +5.5V (continued) All specifications at TA = +25°C, RL = 2kΩ connected to VS/2, and VOUT = VS/2, unless otherwise noted. SMALL−SIGNAL OVERSHOOT vs LOAD CAPACITANCE 50 SMALL−SIGNAL OVERSHOOT vs LOAD CAPACITANCE 50 2.5pF 2.5pF 45 45 10kΩ +5V 35 Overshoot (%) Overshoot (%) 40 RS 30 V OUT O PA 38 0 25 RP = 2kΩ C 20 −5 V 15 10kΩ 35 +2.
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"#$ %"#$ www.ti.com SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 APPLICATIONS INFORMATION BASIC OPERATION The OPA380 is a high-performance transimpedance amplifier with very low 1/f noise. As a result of its unique architecture, the OPA380 has excellent long-term input voltage offset stability—a 300-hour life test at 150°C demonstrated randomly distributed variation approximately equal to measurement repeatability of 1µV.
PAGE 10
"#$ %"#$ www.ti.com SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 OUTPUT RANGE ACHIEVING OUTPUT SWING TO GROUND The OPA380 is specified to swing within at least 600mV of the positive rail and 100mV of the negative rail with a 2kΩ load with excellent linearity. Swing to the negative rail while maintaining good linearity can be extended to 0V—see the section, Achieving Output Swing to Ground. See the Typical Characteristic curve, Output Voltage Swing vs Output Current.
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"#$ %"#$ www.ti.com SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 the desired transimpedance gain (RF); BIASING PHOTODIODES IN SINGLE-SUPPLY CIRCUITS The +IN input can be biased with a positive DC voltage to offset the output voltage and allow the amplifier output to indicate a true zero photodiode measurement when the photodiode is not exposed to any light. It will also prevent the added delay that results from coming out of the negative rail.
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"#$ %"#$ www.ti.com SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 TRANSIMPEDANCE BANDWIDTH AND NOISE (a) Limiting the gain set by RF can decrease the noise occurring at the output of the transimpedance circuit. However, all required gain should occur in the transimpedance stage, since adding gain after the transimpedance amplifier generally produces poorer noise performance. The noise spectral density produced by RF increases with the square-root of RF, whereas the signal increases linearly.
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"#$ %"#$ www.ti.com SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 500 CDIODE = 10pF Integrated Output Noise (µVrms) Transimpedance Gain (dB) 110 See Figure 6a 80 −3dB BW at 1MHz 50 See Figure 6c 20 See Figure 6b −10 100 CDIODE = 10pF 400 419µV See Figure 6a 300 200 See Figure 6b 100 86µV See Figure 6c 30µV 0 1k 10k 100k 1M 10M 1 100M 10 100 Frequency (Hz) 1k 10k 100k Frequency (Hz) 1M 10M 100M Figure 7. Transimpedance Gains for Circuits in Figure 6 Figure 9.
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"#$ %"#$ www.ti.com SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 BOARD LAYOUT CAPACITIVE LOAD AND STABILITY Minimize photodiode capacitance and stray capacitance at the summing junction (inverting input). This capacitance causes the voltage noise of the op amp to be amplified (increasing amplification at high frequency). Using a low-noise voltage source to reverse-bias a photodiode can significantly reduce its capacitance. Smaller photodiodes have lower capacitance.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
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PACKAGE MATERIALS INFORMATION www.ti.com 16-Aug-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing OPA2380AIDGKR VSSOP DGK 8 OPA2380AIDGKT VSSOP DGK OPA380AIDGKR VSSOP DGK OPA380AIDGKT VSSOP OPA380AIDR SOIC SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 8 250 180.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 8 2500 330.0 12.4 5.3 3.4 1.
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PACKAGE MATERIALS INFORMATION www.ti.com 16-Aug-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) OPA2380AIDGKR VSSOP DGK 8 2500 367.0 367.0 35.0 OPA2380AIDGKT VSSOP DGK 8 250 210.0 185.0 35.0 OPA380AIDGKR VSSOP DGK 8 2500 367.0 367.0 35.0 OPA380AIDGKT VSSOP DGK 8 250 210.0 185.0 35.0 OPA380AIDR SOIC D 8 2500 367.0 367.0 35.
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