THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 Ultra Low Power, Rail-to-Rail Output, Fully-Differential Amplifier Check for Samples: THS4531A FEATURES DESCRIPTION • The THS4531A is a low-power, fully-differential op amp with input common-mode range below the negative rail and rail-to-rail output. The device is designed for low-power data acquisition systems and high density applications where power consumption and dissipation is critical.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com 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. ESD damage can range from subtle performance degradation to complete device failure.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 ELECTRICAL CHARACTERISTICS: VS = 2.7 V Test conditions at TA = 25°C, VS+ = 2.7 V, VS– = 0 V, VOCM = open, VOUT = 2 VPP, RF = 2 kΩ, RL = 2 kΩ differential, G = 1 V/V, single-ended input, differential output, and input and output referenced to mid-supply, unless otherwise noted.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com ELECTRICAL CHARACTERISTICS: VS = 2.7 V (continued) Test conditions at TA = 25°C, VS+ = 2.7 V, VS– = 0 V, VOCM = open, VOUT = 2 VPP, RF = 2 kΩ, RL = 2 kΩ differential, G = 1 V/V, single-ended input, differential output, and input and output referenced to mid-supply, unless otherwise noted.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 ELECTRICAL CHARACTERISTICS: VS = 2.7 V (continued) Test conditions at TA = 25°C, VS+ = 2.7 V, VS– = 0 V, VOCM = open, VOUT = 2 VPP, RF = 2 kΩ, RL = 2 kΩ differential, G = 1 V/V, single-ended input, differential output, and input and output referenced to mid-supply, unless otherwise noted.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com ELECTRICAL CHARACTERISTICS: VS = 5 V Test conditions at TA = +25°C, VS+ = 5 V, VS– = 0 V, VOCM = open, VOUT = 2 VPP, RF = 2 kΩ, RL = 2 kΩ differential, G = 1 V/V, single-ended input, differential output, and input and output referenced to mid-supply, unless otherwise noted.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 ELECTRICAL CHARACTERISTICS: VS = 5 V (continued) Test conditions at TA = +25°C, VS+ = 5 V, VS– = 0 V, VOCM = open, VOUT = 2 VPP, RF = 2 kΩ, RL = 2 kΩ differential, G = 1 V/V, single-ended input, differential output, and input and output referenced to mid-supply, unless otherwise noted.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com ELECTRICAL CHARACTERISTICS: VS = 5 V (continued) Test conditions at TA = +25°C, VS+ = 5 V, VS– = 0 V, VOCM = open, VOUT = 2 VPP, RF = 2 kΩ, RL = 2 kΩ differential, G = 1 V/V, single-ended input, differential output, and input and output referenced to mid-supply, unless otherwise noted.
THS4531A www.ti.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com TABLE OF GRAPHS Description VS = 2.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 TYPICAL CHARACTERISTICS: VS = 2.7V Test conditions unless otherwise noted: VS+ = 2.7 V, VS– = 0V, CM = open, VOUT = 2Vpp, RF = 2kΩ, RL = 2kΩ Differential, G = 1V/V, Single-Ended Input, Differential Output, Input and Output Referenced to mid-supply unless otherwise noted. LARGE-SIGNAL FREQUENCY RESPONSE G = 1 V/V G = 2 V/V G = 5 V/V G = 10 V/V 10M Normalized Gain (dB) 100M Frequency (Hz) 1M 10M Figure 2. Figure 3.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com TYPICAL CHARACTERISTICS: VS = 2.7V (continued) Test conditions unless otherwise noted: VS+ = 2.7 V, VS– = 0V, CM = open, VOUT = 2Vpp, RF = 2kΩ, RL = 2kΩ Differential, G = 1V/V, Single-Ended Input, Differential Output, Input and Output Referenced to mid-supply unless otherwise noted. HARMONIC DISTORTION vs FREQUENCY VS = 2.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 TYPICAL CHARACTERISTICS: VS = 2.7V (continued) Test conditions unless otherwise noted: VS+ = 2.7 V, VS– = 0V, CM = open, VOUT = 2Vpp, RF = 2kΩ, RL = 2kΩ Differential, G = 1V/V, Single-Ended Input, Differential Output, Input and Output Referenced to mid-supply unless otherwise noted. SINGLE-ENDED OUTPUT VOLTAGE SWING vs LOAD RESISTANCE TWO-TONE, 2nd and 3rdORDER INTERMODULATION DISTORTION vs FREQUENCY VS = 2.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com TYPICAL CHARACTERISTICS: VS = 2.7V (continued) Test conditions unless otherwise noted: VS+ = 2.7 V, VS– = 0V, CM = open, VOUT = 2Vpp, RF = 2kΩ, RL = 2kΩ Differential, G = 1V/V, Single-Ended Input, Differential Output, Input and Output Referenced to mid-supply unless otherwise noted. REJECTION RATIO vs FREQUENCY TURN-ON TIME −50 −60 −70 0.5 1 Power Down VOUT CMRR PSRR 1M Frequency (Hz) 10M 0 1 20 30 Time (ns) 40 0.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 TYPICAL CHARACTERISTICS: VS = 2.7V (continued) Test conditions unless otherwise noted: VS+ = 2.7 V, VS– = 0V, CM = open, VOUT = 2Vpp, RF = 2kΩ, RL = 2kΩ Differential, G = 1V/V, Single-Ended Input, Differential Output, Input and Output Referenced to mid-supply unless otherwise noted. VOCM SMALL-SIGNAL FREQUENCY RESPONSE VOCM LARGE- and SMALL SIGNAL PULSE RESPONSE 2 Output Common-Mode Voltage (V) 3 0 Gain (dB) −3 −6 −9 −12 −15 VS = 2.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com TYPICAL CHARACTERISTICS: VS = 2.7V (continued) Test conditions unless otherwise noted: VS+ = 2.7 V, VS– = 0V, CM = open, VOUT = 2Vpp, RF = 2kΩ, RL = 2kΩ Differential, G = 1V/V, Single-Ended Input, Differential Output, Input and Output Referenced to mid-supply unless otherwise noted. INPUT OFFSET VOLTAGE HISTOGRAM INPUT OFFSET VOLTAGE TEMP DRIFT HISTOGRAM 600 500 10 THS4531AID VS = 2.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 TYPICAL CHARACTERISTICS: VS = 5V Test conditions unless otherwise noted: VS+ = 5 V, VS– = 0V, VOCM = open, VOUT = 2Vpp, RF = 2kΩ, RL = 2kΩ Differential, G = 1V/V, Single-Ended Input, Differential Output, Input and Output Referenced to mid-supply, TA = 25°Cunless otherwise noted. LARGE-SIGNAL FREQUENCY RESPONSE G = 1 V/V G = 2 V/V G = 5 V/V G = 10 V/V Gain (dB) 10M 100M Frequency (Hz) 1M 10M Figure 35. Figure 36.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com TYPICAL CHARACTERISTICS: VS = 5V (continued) Test conditions unless otherwise noted: VS+ = 5 V, VS– = 0V, VOCM = open, VOUT = 2Vpp, RF = 2kΩ, RL = 2kΩ Differential, G = 1V/V, Single-Ended Input, Differential Output, Input and Output Referenced to mid-supply, TA = 25°Cunless otherwise noted.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 TYPICAL CHARACTERISTICS: VS = 5V (continued) Test conditions unless otherwise noted: VS+ = 5 V, VS– = 0V, VOCM = open, VOUT = 2Vpp, RF = 2kΩ, RL = 2kΩ Differential, G = 1V/V, Single-Ended Input, Differential Output, Input and Output Referenced to mid-supply, TA = 25°Cunless otherwise noted.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com TYPICAL CHARACTERISTICS: VS = 5V (continued) Test conditions unless otherwise noted: VS+ = 5 V, VS– = 0V, VOCM = open, VOUT = 2Vpp, RF = 2kΩ, RL = 2kΩ Differential, G = 1V/V, Single-Ended Input, Differential Output, Input and Output Referenced to mid-supply, TA = 25°Cunless otherwise noted. REJECTION RATIO vs FREQUENCY TURN-ON TIME −60 −70 −80 CMRR PSRR −90 1M Frequency (Hz) 10M 200 3 1.5 1 2 0.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 TYPICAL CHARACTERISTICS: VS = 5V (continued) Test conditions unless otherwise noted: VS+ = 5 V, VS– = 0V, VOCM = open, VOUT = 2Vpp, RF = 2kΩ, RL = 2kΩ Differential, G = 1V/V, Single-Ended Input, Differential Output, Input and Output Referenced to mid-supply, TA = 25°Cunless otherwise noted. VOCM SMALL-SIGNAL FREQUENCY RESPONSE VOCM LARGE- and SMALL SIGNAL PULSE RESPONSE 3.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com TYPICAL CHARACTERISTICS: VS = 5V (continued) Test conditions unless otherwise noted: VS+ = 5 V, VS– = 0V, VOCM = open, VOUT = 2Vpp, RF = 2kΩ, RL = 2kΩ Differential, G = 1V/V, Single-Ended Input, Differential Output, Input and Output Referenced to mid-supply, TA = 25°Cunless otherwise noted.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 APPLICATION INFORMATION TYPICAL CHARACTERISTICS TEST CIRCUITS Figure 68 shows the general test circuit built on the EVM that was used for testing the THS4531A. For simplicity, power supply decoupling is not shown – please see layout in the applications section for recommendations. Depending on the test conditions, component values are changed per Table 2 and Table 3, or as otherwise noted.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com Due to the voltage divider on the output formed by the load component values, the amplifier’s output is attenuated. The column “Atten” in Table 3 shows the attenuation expected from the resistor divider. When using a transformer at the output as shown in Figure 68, the signal will see slightly more loss due to transformer and line loss, and these numbers will be approximate.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 VIN+ RF RG Input From 50Test Equipment PD RIT RO VOUT± RO VOUT+ Output to Test Equipment VS+ + 0.22 F VOCM THS4531A ± 0.22 F VIN± VS± RG No Connection RF RIT 0.22 F Installed to Balance Amplifier Output to Test Equipment 49.9 Figure 69.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com Power Supply Network Analyzer Cal Diff Probe VIN+ RF RG RO No Connection VS+ RIT VOUT± + VOCM THS4531A ± 0.22 F VIN± VS± ROT Measure With Diff Probe VOUT+ RG RO No Connection RF RIT Figure 71. PSRR Test Circuit VOCM Input The circuit shown in Figure 72 is used to measure the transient response, frequency response and input impedance of the VOCM input. For these tests, the cal point is across the 49.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 Balance Error The circuit shown in Figure 73 is used to measure the balance error of the main differential amplifier. A network analyzer is used as the signal source and the measurement device. The output impedance of the network analyzer is 50Ω and is DC coupled. RIT and RG are chosen to impedance match to 50Ω and maintain the proper gain. To balance the amplifier, a 49.9Ω resistor to ground is inserted across RIT on the alternate input.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com APPLICATION CIRCUITS The following circuits show application information for the THS4531A. For simplicity, power supply decoupling capacitors are not shown in these diagrams – please see the EVM and Layout Recommendations section for recommendations. For more detail on the use and operation of fully differential op amps refer to application report “Fully-Differential Amplifiers” SLOA054D.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 Input Common-Mode Voltage Range The input common-model voltage of a fully differential op amp is the voltage at the “+ and –“ input pins of the op amp. It is important to not violate the input common-mode voltage range (VICR) of the op amp. Assuming the op amp is in linear operation the voltage across the input pins is only a few millivolts at most.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com Power Down The power down pin is internally connected to a CMOS stage which must be driven to a minimum of 2.1V to ensure proper high logic. VS+ Internal PD Circuit PD VS± Figure 77. Simplified Power Down Internal Circuit If 1.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 Single-Supply Operation To facilitate testing with common lab equipment, the THS4531A EVM is built to allow for split-supply operation and most of the data presented in this data sheet was taken with split-supply power inputs. But the device is designed for use with single-supply power operation and can easily be used with single-supply power without degrading the performance.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com 200 RO (Ω) 100 10 VS = 2.7 V G = 1 V/V RF = 2 kΩ RL = 2 kΩ 1 1 10 100 CLOAD (pF) 1k 2k G068 Figure 80. Recommended Series Output Resistor vs Capacitive Load for Flat Frequency Response 3 0 Gain (dB) −3 −6 −9 −12 −15 −18 −21 100k VS = 2.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 RF RG 10 VIN± VOUT± 100 pF VS+ + From Analyzer VOCM THS4531A To Analyzer ± 0.22 F RG 10 VIN+ VOUT+ RF 100 pF Figure 82. THS4531A Audio Analyzer Test Circuit −95 VS = 5 V G = 1 V/V VOUT = 1 VRMS RF = 2 kΩ RL = 600 Ω No Weighting A−Weighting −97 −99 THD+N (dB) −101 −103 −105 −107 −109 −111 −113 −115 0 5k 10k 15k Frequency (Hz) 20k 24k G070 Magnitude (dBV) Figure 83.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com Audio On/Off Pop Performance The THS4531A is tested to show on and off pop performance by connecting a speaker between the differential outputs and switching on and off the power supply, and also by using the power down function of the THS4531A. Testing was done with and without tones. During these tests no audible pop could be heard. 5 2.5 4 2 VS = 5 V G = 2 V/V RF = 2 kΩ RL = 200 Ω 3 1 2 1 0 1.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 Power Down (V) 4 VS = 5 V G = 2 V/V RF = 2 kΩ RL = 200 Ω 3 1.5 2 1 1 0.5 0 0 50m 100m Time (s) 150m Output Voltage (V) 2.5 Power Down VOUT + VOUT − 2 5 0 200m G074 Figure 87. PD Enable Pop Performance AUDIO ADC DRIVER PERFORMANCE: THS4531A AND PCM4204 COMBINED PERFORMANCE To show achievable performance with a high performance audio ADC, the THS4531A is tested as the drive amplifier for the PCM4204.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com An audio analyzer is used to provide an analog audio input to the EVM and the PCM formatted digital output is read by the digital input on the analyzer. Data was taken at fS = 96kHz, and audio output uses PCM format. Other data rates and formats are expected to show similar performance in line with that shown in the data sheet. Figure 89 shows the THD+N vs Frequency with no weighting and Figure 90 shows an FFT with 1kHz input tone.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 The standard ADS8321 EVM and THS4531A EVM are modified to implement the schematic in Figure 91 and used to test the performance of the THS4531A as a drive amplifier. With single supply +5V supply the output common-mode of the THS4531A defaults to +2.5V as required at the input of the ADS8321 so the VOCM input of the THS4531A simply bypassed to GND with 0.22µF capacitor.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com The standard ADS7945 EVM and THS4531A EVM are modified to implement the schematic in Figure 93 and used to test the performance of the THS4531A as a drive amplifier. With single supply +5V supply the output common-mode of the THS4531A defaults to +2.5V as required at the input of the ADS7945 so the VOCM input of the THS4531A simply bypassed to GND with 0.22µF capacitor.
THS4531A www.ti.com SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 EVM AND LAYOUT RECOMMENDATIONS The THS4531A EVM (SLOU356) should be used as a reference when designing the circuit board. It is recommended to follow the EVM layout of the external components near to the amplifier, ground plane construction, and power routing as closely as possible. General guidelines are: 1. Signal routing should be direct and as short as possible into and out of the op amp. 2.
THS4531A SLOS823A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com REVISION HISTORY Changes from Original (December 2012) to Revision A • 40 Page Changed graph title from "VOS OVER TEMPERATURE" to "SMALL-SIGNAL FREQUENCY RESPONSE" .....................
PACKAGE OPTION ADDENDUM www.ti.
PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-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.
PACKAGE MATERIALS INFORMATION www.ti.com 14-Mar-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 THS4531AIDR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 THS4531AIRUNR QFN RUN 10 3000 180.0 8.4 2.3 2.3 1.15 4.0 8.0 Q2 THS4531AIRUNT QFN RUN 10 250 180.0 8.4 2.3 2.3 1.15 4.0 8.
PACKAGE MATERIALS INFORMATION www.ti.com 14-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) THS4531AIDR SOIC D 8 2500 367.0 367.0 35.0 THS4531AIRUNR QFN RUN 10 3000 210.0 185.0 35.0 THS4531AIRUNT QFN RUN 10 250 210.0 185.0 35.
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