Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp, differential amplifier Differential MSOP 8 PowerPad

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FEATURES KEY APPLICATIONS

THS4121

D, DGN, OR DGK PACKAGE

(TOP VIEW)

IN−

OCM

OUT+

IN+

GND

OUT−

THS4120

D, DGN, OR DGK PACKAGE

(TOP VIEW)

IN−

OCM

OUT+

IN+

GND

OUT−

DESCRIPTION

DIGITAL

OUTPUT

−

+ −

OCM

ref

3.3 V

TYPICAL A/D APPLICATION CIRCUIT

THS4120

THS4121

SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004

HIGH-SPEED FULLY DIFFERENTIAL I/O AMPLIFIERS

• Simple Single-Ended To Differential

• High Performance

Conversion

– 100 MHz, –3 dB Bandwidth

• Differential ADC Driver/Differential

– 50 V/ µ s Slew Rate

Antialiasing

– 75 dB Total Harmonic Distortion at 1 MHz

• Differential Transmitter and Receiver

= 2 V

)

• Output Level Shifter

– 5.4 nV/ √ Hz Input-Referred Noise (10 kHz)

• Differential Input/Differential Output

– Balanced Outputs Reject Common-Mode

Noise

– Differential Reduced Second Harmonic

Distortion

• Power Supply Range

– V

= 3.3 V

Table 1. HIGH-SPEED DIFFERENTIAL I/O FAMILY

The THS412x is one in a family of fully

differential-input, differential-output devices

NUMBER OF

DEVICE POWERDOWN

CHANNELS

fabricated using Texas Instruments' state-of-the-art

submicron CMOS process.

THS4120

(1)

1 Yes

THS4121 1 –

The THS412x consists of a true, fully differential

signal path from input to output. This results in

excellent common-mode noise rejection and

(1) For proper functiionality, an external 10-k Ω pullup resistor is

improved total harmonic distortion.

required between the PD pin and the positive supply.

RELATED DEVICES

SINGLE SUPPLY SPLIT SUPPLY

DEVICE

(1)

DESCRIPTION

VOLTAGE RANGE VOLTAGE RANGE

THS413x 150 MHz, 51 V/ µ s, 1.3 nV/ √ Hz 5 V to 30 V ± 2.5 to ± 15

THS414x 160 MHz, 450 V/ µ s, 6.5 nV/ √ Hz 5 V to 30 V ± 2.5 to ± 15

THS415x 150 MHz, 650 V/ µ s, 7.6 nV/ √ Hz 5 V to 30 V ± 2.5 to ± 15

(1) See the TI Web site for additional high-speed amplifier devices.

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.

PowerPAD is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (31 pages)

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THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 HIGH-SPEED FULLY DIFFERENTIAL I/O AMPLIFIERS FEATURES KEY APPLICATIONS • • • • High Performance – 100 MHz, –3 dB Bandwidth – 50 V/µs Slew Rate – 75 dB Total Harmonic Distortion at 1 MHz (VO = 2 VPP) – 5.4 nV/√Hz Input-Referred Noise (10 kHz) Differential Input/Differential Output – Balanced Outputs Reject Common-Mode Noise – Differential Reduced Second Harmonic Distortion Power Supply Range – VDD = 3.
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THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 RECOMMENDED OPERATING CONDITIONS Supply voltage TA Operating free-air temperature TYP MAX ±1.5 ±1.65 ±1.75 Single supply 3 3.3 3.5 C suffix 0 70 –40 85 Split supply VDD MIN I suffix UNIT V °C ELECTRICAL CHARACTERISTICS VDD = 3.3 V, RL = 800 Ω, TA = 25°C (unless otherwise noted) (1) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT DYNAMIC PERFORMANCE BW Small-signal bandwidth (–3 dB) VDD = 3.
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THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 ELECTRICAL CHARACTERISTICS (Continued) VDD = 3.3 V, RL = 800 Ω, TA = 25°C (unless otherwise noted) (1) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT INPUT CHARACTERISTICS CMRR Common-mode rejection ratio TA = full range 64 96 dB VICR Common-mode input voltage range TA = full range 0.65 to VDD – 0.1 0.
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THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 TYPICAL CHARACTERISTICS (continued) FIGURE zo Single-ended (VOCM) input impedance vs Frequency 17 SMALL-SIGNAL FREQUENCY RESPONSE SLEW RATE 2 1.5 Rf = 390 Ω Falling Edge 1 Rf = 200 Ω 0 Gain − dB VO − Output Voltage − V Rf = 270 Ω 1 Rf = 150 Ω −1 −2 −3 1M 0 −0.5 −1 G=1 VI = 22.5 mVRMS VDD = 3.3 V −4 100 k VDD = 3.3 V, VO = 2 VPP, TA= 25°C G=1 RL = 800 Ω 0.5 Rising Edge −1.
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THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 THS4121 TOTAL HARMONIC DISTORTION vs FREQUENCY −60 −40 5th_HD 2nd_HD 3rd_HD −70 −80 −90 3rd_HD −100 −120 100 k −30 −40 3rd_HD −60 2nd_HD −70 −80 −90 5th_HD 4th_HD 1M f − Frequency − Hz −120 100 k 10 M 1M f − Frequency − Hz Figure 6. THS4121 HARMONIC DISTORTION vs FREQUENCY THS4121 HARMONIC DISTORTION vs OUTPUT VOLTAGE −60 −70 2nd_HD −50 3rd_HD −60 −70 5th_HD 4th_HD −90 VDD = 3.
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THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 THS4121 HARMONIC DISTORTION vs OUTPUT VOLTAGE −70 Harmonic Distortion − dB −10 VDD = 3.3 V, f = 1 MHz, RL = 800 Ω, Rf = 200 Ω, G=1 −80 2nd_HD Third Intermodulation Distortion − dBc −60 THIRD INTERMODULALTION DISTORTION vs OUTPUT VOLTAGE 3rd_HD −90 4th_HD −100 5th_HD −110 VDD = 3.3 V, f = 1 MHz Rf = 270 Ω, RL = 800 Ω −20 −30 f = 10 MHz −40 −50 −60 f = 5 MHz −70 −80 Single Input / Differential Output −120 0 0.
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THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 VOLTAGE NOISE vs FREQUENCY OUTPUT OFFSETE VOLTAGE vs COMMON-MODE INPUT VOLTAGE 0.1 120 VOO − Output Offset Voltage − V V n − Voltage Noise − nV/ Hz 140 100 80 60 40 0 −0.1 −0.2 −0.3 20 0 −0.4 1 10 100 1k f − Frequency − Hz 10 k 100 k 0 Figure 13. Figure 14. THS4121 COMMON-MODE REJECTION RATIO vs FREQUENCY THS4121 SINGLE-ENDED OUTPUT IMPEDANCE vs FREQUENCY −70 −80 −90 −100 −110 100 k 8 3 1000 VDD = 3.
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THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 THS4121 SINGLE-ENDED (VOCM) INPUT IMPEDANCE vs FREQUENCY Z is − Single-Ended (VOCM ) Input Impedance − Ω 1M VDD = 3.3 V, VI = −0.071 V(RMS) 100 k 10 k 1k 100 10 100 k 1M 100 M 10 M f − Frequency − Hz 1G Figure 17.
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THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 APPLICATION INFORMATION RESISTOR MATCHING Resistor matching is important in fully differential amplifiers. The balance of the output on the reference voltage depends on matched ratios of the resistors. CMRR, PSRR, and cancellation of the second harmonic distortion diminish if resistor mismatch occurs. Therefore, it is recommended to use 1% tolerance resistors or better to keep the performance optimized.
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THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 APPLICATION INFORMATION (continued) DATA CONVERTERS Data converters are one of the most popular applications for the fully differential amplifiers. Fully differential amplifiers can operate with a single supply. VOCM defaults to the midrail voltage, VDD/2. The differential output may be fed into a data converter. This method eliminates the use of a transformer in the circuit.
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THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 APPLICATION INFORMATION (continued) DRIVING A CAPACITIVE LOAD Driving capacitive loads with high-performance amplifiers is not a problem as long as certain precautions are taken. The first is to realize that the THS412x has been internally compensated to maximize its bandwidth and slew rate performance.
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THS4120 THS4121 www.ti.
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THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 PRINCIPLES OF OPERATION (continued) Differential Structure Rejects Coupled Noise at the Input Differential Structure Rejects Coupled Noise at the Output VDD _ VINVIN+ + VO+ + _ VO- VOCM Differential Structure Rejects Coupled Noise at the Power Supply GND Figure 24.
PAGE 15
THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 PRINCIPLES OF OPERATION (continued) Fully differential amplifiers may be viewed as two inverting amplifiers. In this case, the equation of an inverting amplifier holds true for gain calculations. One advantage of fully differential amplifiers is that they offer twice as much dynamic range compared to single-ended amplifiers. For example, a 1-VPP ADC can only support an input signal of 1 VPP.
PAGE 16
THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 PRINCIPLES OF OPERATION (continued) the amplifier in the power-on mode of operation. To turn off (disable) the amplifier in an effort to conserve power, the power-down pin can be driven towards the negative rail or ground. The threshold voltages for power-on and power-down are relative to the supply rails and given in the specification tables. Above the Enable Threshold Voltage, the device is on.
PAGE 17
THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 PRINCIPLES OF OPERATION (continued) zos − Single-Ended Output Impedance (in Power Down) − Ω THS4120 SINGLE-ENDED OUTPUT IMPEDANCE (IN POWER DOWN) vs FREQUENCY 10000 VCC = 3.3 V 1000 100 10 100 k 1M 10 M 100 M f − Frequency − Hz 1G Figure 29.
PAGE 18
THS4120 THS4121 www.ti.com SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 PRINCIPLES OF OPERATION (continued) GENERAL PowerPAD DESIGN CONSIDERATIONS (APPLICABLE TO DIFFERENTIAL AMPLIFIER FAMILY) The THS412x is available packaged in a thermally enhanced DGN package, which is a member of the PowerPAD family of packages. This package is constructed using a downset leadframe on which the die is mounted [see Figure 30(a) and Figure 30(b)].
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 18-Oct-2013 Status (1) THS4121IDGNRG4 ACTIVE Package Type Package Pins Package Drawing Qty MSOPPowerPAD DGN 8 2500 Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Op Temp (°C) Device Marking (4/5) -40 to 85 ASC (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs.
PAGE 22
PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 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 THS4120CDGNR MSOPPower PAD DGN 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 THS4120IDGNR MSOPPower PAD DGN 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 THS4120IDR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) THS4120CDGNR MSOP-PowerPAD DGN 8 2500 358.0 335.0 35.0 THS4120IDGNR MSOP-PowerPAD DGN 8 2500 358.0 335.0 35.0 THS4120IDR SOIC D 8 2500 367.0 367.0 35.0 THS4121CDGKR VSSOP DGK 8 2500 358.0 335.0 35.0 THS4121CDGNR MSOP-PowerPAD DGN 8 2500 358.0 335.0 35.0 THS4121IDGKR VSSOP DGK 8 2500 358.0 335.
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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.