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SLOS388B − OCTOBER 2001 − REVISED JUNE 2002

   

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FEATURES

Gain Bandwidth Product: 180 MHz

D Slew Rate: 100 V/µs

D Maximum Input Bias Current: 100 pA

D Input Voltage Noise: 5.4 nV/√Hz

D Maximum Input Offset Voltage: 4 mV

D Input Impedance: 10

Ω || 10 pF

D Power Supply Voltage Range: ±5 to ±15 V

D Unity Gain Stable

APPLICATIONS

Wideband Photodiode Amplifier

D High-Speed Transimpedance Gain Stage

D Test and Measurement Systems

D Current-DAC Output Buffer

D Active Filtering

D High-Speed Signal Integrator

D High-Impedance Buffer

DESCRIPTION

The THS4601 is a high-speed, FET-input operational

amplifier designed for applications requiring wideband

operation, high-input impedance, and high-power

supply voltages. By providing a 180-MHz gain-

bandwidth product, ±15-V supply operation, and

100-pA input bias current, the THS4601 is capable of

wideband transimpedance gain and large output signal

swing simultaneously. Low current and voltage noise

allow amplification of extremely low-level input signals

while still maintaining a large signal-to-noise ratio.

The characteristics of the THS4601 ideally suit it for use

as a wideband photodiode amplifier. Photodiode output

current is a prime candidate for transimpedance

amplification, an application of which is illustrated in

Figure 1. Other potential applications include test and

measurement systems requiring high-input impedance,

digital-to-analog converter output buffering, high-speed

integration, and active filtering.

A SELECTION OF RELATED OPERATIONAL AMPLIFIER PRODUCTS

DEVICE

(V)

(MHz)

SLEW RATE

(V/µs)

VOLTAGE NOISE

(nV√Hz

)

DESCRIPTION

OPA627 ±15 16 55 4.5 Unity-gain stable FET-input amplifier

OPA637 ±15 80 135 4.5 Gain of +5 stable FET-input amplifier

OPA655 ±5 400 290 6 Unity-gain stable FET-input amplifier

THS4601

= 0.7 pF

= 1 kΩ

100

105

0.1 1 10 100

Frequency − MHz

Transimpedance Gain − dB

100 kΩ TRANSIMPEDANCE BANDWIDTH

Diode Capacitance: 18 pF

−3 dB Bandwidth: 4 MHz

Figure 1. Wideband Photodiode

Transimpedance Amplifier

= 100 kΩ

−V

Bias

18 pF

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Summary of content (32 pages)

PAGE 1
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 FEATURES D Gain Bandwidth Product: 180 MHz D Slew Rate: 100 V/µs D Maximum Input Bias Current: 100 pA D Input Voltage Noise: 5.
PAGE 2
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 Terminal Functions THS4601 D AND DDA PACKAGE (TOP VIEW) NC IN − IN + VS− 1 8 2 7 3 6 4 5 TERMINAL NAME NC VS+ OUT NC NC − No internal connection DESCRIPTION NO. NC 1, 5, 8 These pins have no internal connection.
PAGE 3
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 electrical specifications: VS = ±15 V: RF = 250 Ω, RL = 1 kΩ and G = +2 (unless otherwise noted) THS4601 PARAMETER TEST CONDITIONS TYP 25°C OVER TEMPERATURE 25°C 0°C to 70°C −40°C to 85°C MIN/ MAX UNIT AC PERFORMANCE G = +1, VO = 20 mVpp, RF = 0 Ω 440 Typ MHz G = +2, VO = 40 mVpp, RF = 62 Ω 95 Typ MHz G = +5, VO = 100 mVpp, RF = 500 Ω 36 Typ MHz G = +10, VO = 200 mVpp, RF = 1 kΩ 18 Typ MHz Gain-bandwidth product G > +10 180 Typ
PAGE 4
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 electrical specifications: VS = ±15 V: RF = 250 Ω, RL = 1kΩ and G = +2 (unless otherwise noted) (continued) THS4601 PARAMETER TEST CONDITIONS TYP OVER TEMPERATURE 25°C 25°C 0°C to 70°C −40°C to 85°C MIN/ MAX UNIT 12.8 to –13.4 12.4 to −13.1 12.3 to −13.0 12.1 to −12.
PAGE 5
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 electrical specifications: VS = ±5 V: RF = 250 Ω, RL = 1 kΩ and G = +2 (unless otherwise noted) THS4601 PARAMETER TEST CONDITIONS TYP 25°C OVER TEMPERATURE 25°C 0°C to 70°C −40°C to 85°C MIN/ MAX UNIT AC PERFORMANCE G = +1, VO = 20 mVpp 400 Typ MHz G = +2, VO = 40 mVpp 100 Typ MHz G = +5, VO = 100 mVpp 50 Typ MHz G = +10, VO = 200 mVpp 18 Typ MHz Gain-bandwidth product G > +10 180 Typ MHz Bandwidth for 0.
PAGE 6
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 electrical specifications: VS = ±5 V; RF = 250 Ω, RL = 1 kΩ and G = +2 (unless otherwise noted) (continued) THS4601 PARAMETER TEST CONDITIONS TYP OVER TEMPERATURE UNIT 25°C 25°C 0°C to 70°C −40°C to 85°C MIN/ MAX Specified operating voltage ±5 ±16.5 ±16.5 ±16.5 Max V Maximum quiescent current 9.6 11.2 11.4 11.7 Max mA mA POWER SUPPLY Minimum quiescent current Power supply rejection 9.6 8.2 8.0 7.
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SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 TYPICAL CHARACTERISTICS Table of Graphs FIGURE Small-Signal Unity Gain Frequency Response 2 Large-Signal Unity Gain Frequency Response 3 Small-Signal Frequency Response, Gain = +2 4 Small-Signal Frequency Response, Gain = +5 5 Small-Signal Frequency Response, Gain = +10 6 Small-Signal Frequency Response, Gain = +100 7 Open-Loop Gain and Phase vs Frequency 8 Voltage Noise vs Frequency 9 Rejection Ratios vs Frequency 10 Closed-Loop Output
PAGE 8
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 TYPICAL CHARACTERISTICS measurement conditions: TA = 25°C, RL = 1 kΩ, VS = ±15 V (unless otherwise noted) SMALL-SIGNAL UNITY GAIN FREQUENCY RESPONSE LARGE-SIGNAL UNITY GAIN FREQUENCY RESPONSE 5 8 Gain = 1, RF = 0Ω, RL = 1 kΩ, PIN = −30 dBm 6 4 0 −5 Gain − dB Gain − dB 2 0 −2 −10 −15 −4 −20 −6 Gain = 1, RF = 0 Ω, RL = 1 kΩ, PIN = 0 dBm −25 −8 100 k 1M 10 M 100 M Frequency − Hz 100 k 1G 1M 10 M 100 M Frequency − Hz Figure 2 Figure 3
PAGE 9
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 TYPICAL CHARACTERISTICS measurement conditions: TA = 25°C, RL = 1 kΩ, VS = ±15 V (unless otherwise noted) VOLTAGE NOISE vs FREQUENCY 60 90 30 80 0 70 −30 60 −60 50 −90 40 −120 30 −150 20 −180 10 −210 0 −240 −270 10 k 100 k 1 M 10 M 100 M 1 G −10 10 100 1k 60 50 Hz 90 Voltage Noise − nV/ 110 100 Phase − ° Gain − dB OPEN-LOOP GAIN AND PHASE vs FREQUENCY 40 30 20 10 0 10 100 Frequency − Hz Figure 8 100 k CLOSED-LOOP OUTP
PAGE 10
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 TYPICAL CHARACTERISTICS measurement conditions: TA = 25°C, RL = 1 kΩ, VS = ±15 V (unless otherwise noted) SLEW RATE vs OUTPUT VOLTAGE STEP HARMONIC DISTORTION vs OUTPUT VOLTAGE SWING 130 −50 −55 120 Slew Rate − V/ µ s Distortion − dBc SR− 3rd Harmonic −60 2nd Harmonic −65 −70 −75 −80 −85 −95 SR+ 100 90 80 Gain = 2, RF = 250 Ω, RL = 1 kΩ, f = 1 MHz −90 110 Gain = 5, RL = 1 kΩ 70 60 −100 0 2 4 6 8 10 0 12 5 10 15 20 Output Volt
PAGE 11
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 TYPICAL CHARACTERISTICS measurement conditions: TA = 25°C, RL = 1 kΩ, VS = ±15 V (unless otherwise noted) OFFSET VOLTAGE vs TEMPERATURE INPUT OFFSET CURRENT vs TEMPERATURE 2.50 15 10 2 0 Offset Voltage − mV Input Offset Current − pA 5 −5 −10 −15 −20 −25 1.50 1 0.
PAGE 12
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 APPLICATION INFORMATION introduction The THS4601 is a high-speed, FET-input operational amplifier. The combination of its high frequency capabilities and its DC precision make it a design option for a wide variety of applications, including test and measurement, optical monitoring, transimpedance gain circuits, and high-impedance buffers.
PAGE 13
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 APPLICATION INFORMATION designing the transimpedance circuit (continued) As indicated, the current source typically sets the requirements for gain, speed, and dynamic range of the amplifier.
PAGE 14
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 APPLICATION INFORMATION designing the transimpedance circuit (continued) The feedback capacitor provides a pole in the noise gain of the circuit, counteracting the zero in the noise gain caused by the source capacitance. The pole is set such that the noise gain achieves a 20 dB per decade rate-of-closure with the open-loop gain response of the amplifier, resulting in a stable circuit.
PAGE 15
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 APPLICATION INFORMATION designing the transimpedance circuit (continued) Table 1. Transimpedance Performance Summary for Various Configurations SOURCE CAPACITANCE (pF) TRANSIMPEDANCE GAIN (Ω) FEEDBACK CAPACITANCE (pF) −3 dB FREQUENCY (MHz) 18 10k 2.2 10.4 18 100k 0.6 3.3 18 1M 0 1.1 47 10k 3.3 7.6 47 100k 0.6 2.8 47 1M 0 0.88 100 10k 3.9 5.9 100 100k 1.5 1.3 100 1M 0 0.62 220 10k 5.6 3.8 220 100k 1.8 1.
PAGE 16
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 APPLICATION INFORMATION measuring transimpedance bandwidth (continued) IO Network Analyzer 50 Ω C2 50 Ω RS I O + V S C1 VS ǒ 1 Ǔ C 2R S 1 ) 1 C2 (above the pole frequency) NOTE: This interface network creates a capacitive, constant current source from a network analyzer and properly terminates the network analyzer at high frequencies. Figure 32.
PAGE 17
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 APPLICATION INFORMATION alternative transimpedance configurations Other transimpedance configurations are possible. Three possibilities are shown below. The first configuration is a slight modification of the basic transimpedance circuit. By splitting the feedback resistor, the feedback capacitor value becomes more manageable and easier to control.
PAGE 18
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 APPLICATION INFORMATION alternative transimpedance configurations (continued) The third configuration uses a capacitive T-network to achieve fine control of the compensation capacitance. The capacitor CF3 can be used to tune the total effective feedback capacitance to a very fine degree. This circuit behaves the same as the basic transimpedance configuration, with the effective CF given by equation 4.
PAGE 19
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 APPLICATION INFORMATION selection of feedback resistors Feedback resistor selection can have a significant effect on the performance of the THS4601 in a given application, especially in configurations with low closed-loop gain. If the amplifier is configured for unity gain, the output should be directly connected to the inverting input.
PAGE 20
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 APPLICATION INFORMATION overdrive recovery (continued) FALLING EDGE OVERDRIVE RECOVERY RISING EDGE OVERDRIVE RECOVERY 3 Input −5 −1 −10 −2 −15 −3 −20 Output Voltage − V 0 0 2 3 0 0 −5 −1 −2 Gain = 5, VIN = 5.
PAGE 21
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 APPLICATION INFORMATION power dissipation and thermal characteristics The THS4601 does not incorporate automatic thermal shutoff protection, so the designer must take care to ensure that the design does not violate the absolute maximum junction temperature of the device. Failure may result if the absolute maximum junction temperature of 150°C is exceeded. The thermal characteristics of the device are dictated by the package and the PC board.
PAGE 22
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 APPLICATION INFORMATION PC board layout guidelines Achieving optimum performance with a high frequency amplifier requires careful attention to board layout parasitics and external component selection. Recommendations that optimize performance include the following. D Use of a ground plane—It is highly recommended that a ground plane be used on the board to provide all components with a low impedance connection to ground.
PAGE 23
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 APPLICATION INFORMATION PowerPAD design considerations (continued) DIE Side View (a) Thermal Pad DIE End View (b) Bottom View (c) NOTE A: The thermal pad is electrically isolated from all terminals in the package. Figure 41. Views of Thermally Enhanced Package Although there are many ways to properly heatsink the PowerPAD package, the following steps illustrate the recommended approach.
PAGE 24
SLOS388B − OCTOBER 2001 − REVISED JUNE 2002 APPLICATION INFORMATION evaluation module and applications support An evaluation board is available for quick laboratory verification of performance. An evaluation module can be ordered from Texas Instruments’ web site (www.ti.com) or from your local TI sales representative. Applications support is also available for designers. The Product Information Center (PIC) can put designers in touch with applications engineers at Texas Instruments.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 21-Mar-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.