LM1972 www.ti.com SNAS094D – APRIL 1995 – REVISED MARCH 2013 LM1972 μPot 2-Channel 78dB Audio Attenuator with Mute Check for Samples: LM1972 FEATURES DESCRIPTION • • • • The LM1972 is a digitally controlled 2-channel 78dB audio attenuator fabricated on a CMOS process. Each channel has attenuation steps of 0.5dB from 0dB–47.5dB, 1.0dB steps from 48dB–78dB, with a mute function attenuating 104dB. Its logarithmic attenuation curve can be customized through software to fit the desired application. 1 2 3-Wire Serial Interface Daisy-Chain Capability 104dB Mute Attenuation Pop and Click Free Attenuation Changes APPLICATIONS • • • • • Automated Studio Mixing Consoles Music Reproduction Systems Sound Reinforcement Systems Electronic Music (MIDI) Personal Computer Audio Control KEY SPECIFICATIONS • • • • • • Total Harmonic Distortion + Noise: 0.003 % (max) Frequency response: 100 kHz (−3dB) (min) Attenuation range (excluding mute): 78 dB (typ) Differential attenuation: ±0.25 dB (max) Signal-to-noise ratio (ref. 4 Vrms): 110 dB (min) Channel separation: 100 dB (min) The performance of a μPot is demonstrated through its excellent Signal-to-Noise Ratio, extremely low (THD+N), and high channel separation. Each μPot contains a mute function that disconnects the input signal from the output, providing a minimum attenuation of 96dB. Transitions between any attenuation settings are pop free. The LM1972's 3-wire serial digital interface is TTL and CMOS compatible; receiving data that selects a channel and the desired attenuation level. The DataOut pin of the LM1972 allows multiple μPots to be daisy-chained together, reducing the number of enable and data lines to be routed for a given application. Typical Application Connection Diagram Figure 1. Typical Audio Attenuator Application Circuit Figure 2. 20-Lead SOIC - Top View See DW Package 1 2 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. All trademarks are the property of their respective owners. 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. Copyright © 1995–2013, Texas Instruments Incorporated LM1972 SNAS094D – APRIL 1995 – REVISED MARCH 2013 www.ti.com 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. Absolute Maximum Ratings (1) (2) (3) Supply Voltage (VDD–VSS) 15V VSS − 0.2V to VDD + 0.2V Voltage at Any Pin Power Dissipation (4) ESD SusceptabiIity 150 mW (5) 2000V Junction Temperature 150°C Soldering Information DW Package (10 sec.) +260°C −65°C to +150°C Storage Temperature (1) (2) (3) (4) (5) All voltages are measured with respect to GND pins (1, 3, 5, 6, 14, 16, 19), unless otherwise specified. Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional. Electrical Characteristics state DC and AC electrical specifications under particular test conditions. This assumes that the device is within the Operating Ratings. The typical value is a good indication of device performance. If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature TA. The maximum allowable power dissipation is PD = (TJMAX − TA)/θJA or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM1972, TJMAX = +150°C, and the typical junction-to-ambient thermal resistance, when board mounted, is 65°C/W. Human body model, 100 pF discharged through a 1.5 kΩ resistor. Operating Ratings (1) (2) Temperature Range TMIN ≤TA ≤TMAX Supply Voltage (VDD − VSS) (1) (2) 2 TMIN TA TMAX 0°C ≤TA ≤ +70°C 4.5V to 12V All voltages are measured with respect to GND pins (1, 3, 5, 6, 14, 16, 19), unless otherwise specified. Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional. Electrical Characteristics state DC and AC electrical specifications under particular test conditions. This assumes that the device is within the Operating Ratings. The typical value is a good indication of device performance. Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1972 LM1972 www.ti.com SNAS094D – APRIL 1995 – REVISED MARCH 2013 Electrical Characteristics (1) (2) The following specifications apply for all channels with VDD = +6V, VSS = −6V, VIN = 5.5 Vpk, and f = 1 kHz, unless otherwise specified. Limits apply for TA = 25°C. Digital inputs are TTL and CMOS compatible. Symbol Parameter Conditions LM1972 Typical (3) IS Supply Current Inputs are AC Grounded THD+N Total Harmonic Distortion plus Noise VIN = 0.5 Vpk @ 0dB Attenuation XTalk Crosstalk (Channel Separation) 0dB Attenuation for VIN Limit (4) Units (Limits) 2 4 0.0008 0.003 mA (max) % (max) 110 100 dB (min) 120 110 dB (min) VCH measured @ −78dB SNR Signal-to-Noise Ratio Inputs are AC Grounded @ −12dB Attenuation A-Weighted AM Mute Attenuation Attenuation Step Size Error Absolute Attenuation Error 96 dB (min) 0dB to −47.5dB 104 ±0.05 dB (max) −48dB to −78dB ±0.25 dB (max) Attenuation @ 0dB 0.03 0.5 dB (min) Attenuation @ −20dB 19.8 19.0 dB (min) Attenuation @ −40dB 39.5 38.5 dB (min) Attenuation @ −60dB 59.3 57.5 dB (min) Attenuation @ −78dB 76.3 74.5 dB (min) Channel-to-Channel Attenuation Attenuation @ 0dB, −20dB, −40dB, −60dB ±0.5 dB (max) Tracking Error Attenuation @ −78dB ±0.75 dB (max) ILEAK Analog Input Leakage Current Inputs are AC Grounded 10.0 100 nA (max) RIN AC Input Impedance Pins 4, 20, VIN = 1.0 Vpk, f = 1 kHz 40 20 kΩ (min) 60 kΩ (max) IIN Input Current fCLK Clock Frequency VIH High-Level Input Voltage @ Pins 9, 10, 11 2.0 V (min) VIL Low-Level Input Voltage @ Pins 9, 10, 11 0.8 V (max) Data-Out Levels (Pin 12) VDD=6V, VSS=0V 0.1 V (max) 5.9 V (min) (1) (2) (3) (4) @ Pins 9, 10, 11 @ 0V < VIN < 5V 1.0 ±100 nA (max) 3 2 MHz (max) All voltages are measured with respect to GND pins (1, 3, 5, 6, 14, 16, 19), unless otherwise specified. Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional. Electrical Characteristics state DC and AC electrical specifications under particular test conditions. This assumes that the device is within the Operating Ratings. The typical value is a good indication of device performance. Typicals are measured at 25°C and represent the parametric norm. Limits are specified to Texas Instrument's AOQL (Average Output Quality Level). Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1972 3 LM1972 SNAS094D – APRIL 1995 – REVISED MARCH 2013 www.ti.com Timing Diagram Figure 3. Timing Diagram PIN DESCRIPTIONS Signal Ground (3, 19): Each input has its own independent ground, GND1 and GND2. Signal Input (4, 20): There are 2 independent signal inputs, IN1 and IN2. Signal Output (2, 17): There are 2 independent signal outputs, OUT1 and OUT2. Voltage Supply (13, 15): Positive voltage supply pins, VDD1 and VDD2. Voltage Supply (7, 18): Negative voltage supply pins, VSS1 and VSS2. To be tied to ground in a single supply configuration. AC Ground (1, 5, 6, 14, 16): These five pins are not physically connected to the die in any way (i.e., No bondwires). These pins must be AC grounded to prevent signal coupling between any of the pins nearby. Pin 14 should be connected to pins 13 and 15 for ease of wiring and the best isolation, as an example. Logic Ground (8): Digital signal ground for the interface lines; CLOCK, LOAD/SHIFT, DATA-IN and DATA-OUT. Clock (9): The clock input accepts a TTL or CMOS level signal. The clock input is used to load data into the internal shift register on the rising edge of the input clock waveform. Load/Shift (10): The load/shift input accepts a TTL or CMOS level signal. This is the enable pin of the device, allowing data to be clocked in while this input is low (0V). Data-In (11): The data-in input accepts a TTL or CMOS level signal. This pin is used to accept serial data from a microcontroller that will be latched and decoded to change a channel's attenuation level. Data-Out (12): This pin is used in daisy-chain mode where more than one μPot is controlled via the same data line. As the data is clocked into the chain from the μC, the preceding data in the shift register is shifted out the DATA-OUT pin to the next μPot in the chain or to ground if it is the last μPot in the chain. The LOAD/SHIFT line goes high once all of the new data has been shifted into each of its respective registers. 4 Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1972 LM1972 www.ti.com SNAS094D – APRIL 1995 – REVISED MARCH 2013 Connection Diagram Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1972 5 LM1972 SNAS094D – APRIL 1995 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics 6 Supply Current vs Supply Voltage Supply Current vs Temperature Figure 4. Figure 5. Noise Floor Spectrum by FFT Amplitude vs Frequency THD vs Freq by FFT VDD − VSS = 12V Figure 6. Figure 7. THD vs VOUT at 1 KHz by FFT VDD − VSS = 12V Crosstalk Test Figure 8. Figure 9. Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1972 LM1972 www.ti.com SNAS094D – APRIL 1995 – REVISED MARCH 2013 Typical Performance Characteristics (continued) THD + N vs Frequency and Amplitude FFT of 1 kHz THD Figure 10. Figure 11. FFT of 20 kHz THD THD + N vs Amplitude Figure 12. Figure 13. THD + N vs Amplitude THD + N vs Amplitude Figure 14. Figure 15. Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1972 7 LM1972 SNAS094D – APRIL 1995 – REVISED MARCH 2013 www.ti.com APPLICATION INFORMATION ATTENUATION STEP SCHEME The fundamental attenuation step scheme for the LM1972 μPot is shown in Figure 16. This attenuation step scheme, however, can be changed through programming techniques to fit different application requirements. One such example would be a constant logarithmic attenuation scheme of 1dB steps for a panning function as shown in Figure 17. The only restriction to the customization of attenuation schemes are the given attenuation levels and their corresponding data bits shown in Table 1. The device will change attenuation levels only when a channel address is recognized. When recognized, the attenuation level will be changed corresponding to the data bits shown in Table 1. As shown in Figure 19, an LM1972 can be configured as a panning control which separates the mono signal into left and right channels. This circuit may utilize the fundamental attenuation scheme of the LM1972 or be programmed to provide a constant 1dB logarithmic attenuation scheme as shown in Figure 17. LM1972 Channel Attenuation vs Digital Step Value Figure 16. LM1972 Attenuation Step Scheme LM1972 Channel Attenuation vs Digital Step Value (Programmed 1.0dB Steps) Figure 17. LM1972 1.0dB Attenuation Step Scheme 8 Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1972 LM1972 www.ti.com SNAS094D – APRIL 1995 – REVISED MARCH 2013 LM1972 Channel Attenuation vs Digital Step Value (Programmed 2.0dB Steps) Figure 18. LM1972 2.0dB Attenuation Step Scheme Figure 19. Mono Panning Circuit INPUT IMPEDANCE The input impedance of a μPot is constant at a nominal 40 kΩ. To eliminate any unwanted DC components from propagating through the device it is common to use 1 μF input coupling caps. This is not necessary, however, if the dc offset from the previous stage is negligible. For higher performance systems, input coupling caps are preferred. OUTPUT IMPEDANCE The output of a μPot varies typically between 25 kΩ and 35 kΩ and changes nonlinearly with step changes. Since a μPot is made up of a resistor ladder network with a logarithmic attenuation, the output impedance is nonlinear. Due to this configuration, a μPot cannot be considered as a linear potentiometer, but can be considered only as a logarithmic attenuator. It should be noted that the linearity of a μPot cannot be measured directly without a buffer because the input impedance of most measurement systems is not high enough to provide the required accuracy. Due to the low impedance of the measurement system, the output of the μPot would be loaded down and an incorrect reading will result. To prevent loading from occurring, a JFET input op amp should be used as the buffer/amplifier. The performance of a μPot is limited only by the performance of the external buffer/amplifier. MUTE FUNCTION One major feature of a μPot is its ability to mute the input signal to an attenuation level of 104dB as shown in Figure 16. This is accomplished internally by physically isolating the output from the input while also grounding the output pin through approximately 2 kΩ. Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1972 9 LM1972 SNAS094D – APRIL 1995 – REVISED MARCH 2013 www.ti.com The mute function is obtained during power-up of the device or by sending any binary data of 01111111 and above (to 11111111) serially to the device. The device may be placed into mute from a previous attenuation setting by sending any of the above data. This allows the designer to place a mute button onto his system which could cause a microcontroller to send the appropriate data to a μPot and thus mute any or all channels. Since this function is achieved through software, the designer has a great amount of flexibility in configuring the system. DC INPUTS Although the μPot was designed to be used as an attenuator for signals within the audio spectrum, the device is capable of tracking an input DC voltage. The device will track DC voltages to a diode drop above each supply rail. One point to remember about DC tracking is that with a buffer at the output of the μPot, the resolution of DC tracking will depend upon the gain configuration of that output buffer and its supply voltage. It should also be remembered that the output buffer's supply voltage does not have to be the same as the μPot's supply voltage. This could allow for more resolution when DC tracking. SERIAL DATA FORMAT The LM1972 uses a 3-wire serial communication format that is easily controlled by a microcontroller. The timing for the 3-wire set, comprised of DATA-IN, CLOCK, and LOAD/SHIFT is shown in Figure 3. Figure 22 exhibits in block diagram form how the digital interface controls the tap switches which select the appropriate attenuation level. As depicted in Figure 3, the LOAD/SHIFT line is to go low at least 150 ns before the rising edge of the first clock pulse and is to remain low throughout the transmission of each set of 16 data bits. The serial data is comprised of 8 bits for channel selection and 8 bits for attenuation setting. For both address data and attenuation setting data, the MSB is sent first and the 8 bits of address data are to be sent before the 8 bits of attenuation data. Please refer to Figure 20 to confirm the serial data format transfer process. Table 1. LM1972 Micropot Attenuator Register Set Description MSB: LSB Address Register (Byte 0) 0000 0000 Channel 1 0000 0001 Channel 2 0000 0010 Channel 3 Data Register (Byte 1) 10 Contents Attenuation Level dB 0000 0000 0.0 0000 0001 0.5 0000 0010 1.0 0000 0011 1.5 ::::: :: 0001 1110 15.0 0001 1111 15.5 0010 0000 16.0 0010 0001 16.5 0010 0010 17.0 ::::: :: 0101 1110 47.0 0101 1111 47.5 0110 0000 48.0 0110 0001 49.0 0110 0010 50.0 ::::: :: Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1972 LM1972 www.ti.com SNAS094D – APRIL 1995 – REVISED MARCH 2013 Table 1. LM1972 Micropot Attenuator Register Set Description (continued) MSB: LSB 0111 1100 76.0 0111 1101 77.0 0111 1110 78.0 0111 1111 100.0 (Mute) 1000 0000 100.0 (Mute) ::::: :: 1111 1110 100.0 (Mute) 1111 1111 100.0 (Mute) Figure 20. Serial Data Format Transfer Process μPot SYSTEM ARCHITECTURE The μPot's digital interface is essentially a shift register, where serial data is shifted in, latched, and then decoded. As new data is shifted into the DATA-IN pin, the previously latched data is shifted out the DATA-OUT pin. Once the data is shifted in, the LOAD/SHIFT line goes high, latching in the new data. The data is then decoded and the appropriate switch is activated to set the desired attenuation level for the selected channel. This process is continued each and every time an attenuation change is made. Each channel is updated, only, when that channel is selected for an attenuator change or the system is powered down and then back up again. When the μPot is powered up, each channel is placed into the muted mode. μPot LADDER ARCHITECTURE Each channel of a μPot has its own independent resistor ladder network. As shown in Figure 21, the ladder consists of multiple R1/R2 elements which make up the attenuation scheme. Within each element there are tap switches that select the appropriate attenuation level corresponding to the data bits in Table 1. It can be seen in Figure 21 that the input impedance for the channel is a constant value regardless of which tap switch is selected, while the output impedance varies according to the tap switch selected. Figure 21. μPot Ladder Architecture DIGITAL LINE COMPATIBILITY The μPot's digital interface section is compatible with either TTL or CMOS logic due to the shift register inputs acting upon a threshold voltage of 2 diode drops or approximately 1.4V. Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1972 11 LM1972 SNAS094D – APRIL 1995 – REVISED MARCH 2013 www.ti.com DIGITAL DATA-OUT PIN The DATA-OUT pin is available for daisy-chain system configurations where multiple μPots will be used. The use of the daisy-chain configuration allows the system designer to use only one DATA and one LOAD/SHIFT line per chain, thus simplifying PCB trace layouts. In order to provide the highest level of channel separation and isolate any of the signal lines from digital noise, the DATA-OUT pin should be terminated through a 2 kΩ resistor if not used. The pin may be left floating, however, any signal noise on that line may couple to adjacent lines creating higher noise specs. Figure 22. μPot System Architecture DAISY-CHAIN CAPABILITY Since the μPot's digital interface is essentially a shift register, multiple μPots can be programmed utilizing the same data and load/shift lines. As shown in Figure 24, for an n-μPot daisy-chain, there are 16n bits to be shifted and loaded for the chain. The data loading sequence is the same for n-μPots as it is for one μPot. First the LOAD/SHIFT line goes low, then the data is clocked in sequentially while the preceding data in each μPot is shifted out the DATA-OUT pin to the next μPot in the chain or to ground if it is the last μPot in the chain. Then the LOAD/SHIFT line goes high; latching the data into each of their corresponding μPots. The data is then decoded according to the address (channel selection) and the appropriate tap switch controlling the attenuation level is selected. CROSSTALK MEASUREMENTS The crosstalk of a μPot as shown in the Typical Performance Characteristics was obtained by placing a signal on one channel and measuring the level at the output of another channel of the same frequency. It is important to be sure that the signal level being measured is of the same frequency such that a true indication of crosstalk may be obtained. Also, to ensure an accurate measurement, the measured channel's input should be AC grounded through a 1 μF capacitor. 12 Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1972 LM1972 www.ti.com SNAS094D – APRIL 1995 – REVISED MARCH 2013 CLICKS AND POPS So, why is that output buffer needed anyway? There are three answers to this question, all of which are important from a system point of view. The first reason to utilize a buffer/amplifier at the output of a μPot is to ensure that there are no audible clicks or pops due to attenuation step changes in the device. If an on-board bipolar op amp had been used for the output stage, its requirement of a finite amount of DC bias current for operation would cause a DC voltage “pop” when the output impedance of the μPot changes. Again, this phenomenon is due to the fact that the output impedance of the μPot is changing with step changes and a bipolar amplifier requires a finite amount of DC bias current for its operation. As the impedance changes, so does the DC bias current and thus there is a DC voltage “pop”. Secondly, the μPot has no drive capability, so any desired gain needs to be accomplished through a buffer/noninverting amplifer. Third, the output of a μPot needs to see a high impedance to prevent loading and subsequent linearity errors from ocurring. A JFET input buffer provides a high input impedance to the output of the μPot so that this does not occur. Clicks and pops can be avoided by using a JFET input buffer/amplifier such as an LF412ACN. The LF412 has a high input impedance and exhibits both a low noise floor and low THD+N throughout the audio spectrum which maintains signal integrity and linearity for the system. The performance of the system solution is entirely dependent upon the quality and performance of the JFET input buffer/amplifier. LOGARITHMIC GAIN AMPUFIER The μPot is capable of being used in the feedback loop of an amplifier, however, as stated previously, the output of the μPot needs to see a high impedance in order to maintain its high performance and linearity. Again, loading the output will change the values of attenuation for the device. As shown in Figure 23, a μPot used in the feedback loop creates a logarithmic gain amplifier. In this configuration the attenuation levels from Table 1, now become gain levels with the largest possible gain value being 78dB. For most applications 78dB of gain will cause signal clipping to occur, however, because of the μPot's versatility the gain can be controlled through programming such that the clipping level of the system is never obtained. An important point to remember is that when in mute mode the input is disconnected from the output. In this configuration this will place the amplifier in its open loop gain state, thus resulting in severe comparator action. Care should be taken with the programming and design of this type of circuit. To provide the best performance, a JFET input amplifier should be used. Figure 23. Digitally-Controlled Logarithmic Gain Amplifier Circuit Figure 24. n-μPot Daisy-Chained Circuit Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1972 13 LM1972 SNAS094D – APRIL 1995 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision C (March 2013) to Revision D • 14 Page Changed layout of National Data Sheet to TI format .......................................................................................................... 13 Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1972 PACKAGE OPTION ADDENDUM www.ti.com 18-Oct-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM1972M ACTIVE SOIC DW 20 36 TBD Call TI Call TI 0 to 70 LM1972M LM1972M/NOPB ACTIVE SOIC DW 20 36 Green (RoHS & no Sb/Br) SN | CU SN Level-3-260C-168 HR 0 to 70 LM1972M LM1972MX/NOPB ACTIVE SOIC DW 20 1000 Green (RoHS & no Sb/Br) SN | CU SN Level-3-260C-168 HR 0 to 70 LM1972M (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. 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. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. 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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Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LM1972MX/NOPB Package Package Pins Type Drawing SOIC DW 20 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 1000 330.0 24.4 Pack Materials-Page 1 10.9 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 13.3 3.25 12.0 24.0 Q1 PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM1972MX/NOPB SOIC DW 20 1000 367.0 367.0 45.0 Pack Materials-Page 2 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. 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