SSM2250_05

Mono 1.5 W/Stereo 250 mW Power Amplifier SSM2250 FEATURES Part of SoundMAX® audio solution for desktop computers Mono 1.5 W differential or stereo 250 mW output Single-supply operation: 2.7 V to 6 V Low shutdown current = 60 μA PC99 compliant Low distortion: 0.2% THD at 1.5 W Wide bandwidth: 4 MHz Unity-gain stable PIN CONFIGURATIONS LEFT IN 1 SHUTDOWN 2 SE/BTL 3 10 LEFT OUT/BTL– VDD SSM2250 9 8 BTL+ TOP VIEW (Not to Scale) GND 4 7 BYPASS 9-001 RIGHT IN 5 6 RIGHT OUT Figure 1. 10-Lead MSOP Pin Configuration (RM Suffix) APPLICATIONS Desktop, portable, and palmtop computers Sound cards Communication headsets 2-way communications Hand-held games 7 8 NC = NO CONNECT GENERAL DESCRIPTION The SSM2250 is intended for use in desktop computers that have basic audio functions. It is also ideal for any audio system that needs to provide both an internal monaural speaker and a stereo line or headphone output. Combined with an AC97 codec, it provides a PC audio system that meets the PC99 requirements. The SSM2250 is compact and requires a minimum of external components. The SSM2250 features an audio amplifier capable of delivering 1.5 W of low distortion power into a mono 4 Ω bridge-tied load (BTL) or 2 × 90 mW into stereo 32 Ω single-ended load (SE) headphones. Both amplifiers provide rail-to-rail outputs for maximum dynamic range from a single supply. The balanced output provides maximum output from a 5 V supply and eliminates the need for a coupling capacitor. The SSM2250 can automatically switch between an internal mono speaker and external headphones. The device can run from a single supply, ranging from 2.7 V to 6 V, with an active supply current of 9 mA typical. The ability to shut down the amplifiers (60 μA shutdown current) makes the SSM2250 an ideal speaker amplifier for battery-powered applications. The SSM2250 is specified over the industrial (−40°C to +85°C) temperature range. It is available in a 14-lead TSSOP and a 10-lead, surface mount MSOP package. Figure 2. 14-Lead TSSOP Pin Configuration (RU Suffix) FUNCTIONAL BLOCK DIAGRAM VDD LEFT IN A1 LEFT SE/ MONO BTL OUT– BYPASS CAP A2 MONO BTL OUT+ VDD RIGHT IN A3 RIGHT SE OUT SWITCHING CIRCUITRY VDD GND Figure 3. Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved. 00359-003 CLICK AND POP REDUCTION BIAS 00359-002 NC LEFT IN SHUTDOWN SE/BTL +GND RIGHT IN NC 1 14 SSM2250 NC LEFT OUT/BTL VDD BTL+ BYPASS RIGHT OUT NC BTL/SE SELECT SHUTDOWN SSM2250 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Pin Configurations ........................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Characteristics, VS = 5.0 V......................................... 3 Electrical Characteristics, VS = 2.7 V..........................................3 Absolute Maximum Ratings ............................................................4 ESD Caution...................................................................................4 Typical Performance Characteristics ..............................................5 Product Overview .............................................................................7 Typical Application .......................................................................7 Outline Dimensions ....................................................................... 12 Ordering Guide .......................................................................... 12 REVISION HISTORY 6/05—Rev. 0 to Rev. A Updated Format..................................................................Universal Updated Ordering Guide............................................................... 12 10/99—Revision 0: Initial Version Rev. A | Page 2 of 12 SSM2250 SPECIFICATIONS ELECTRICAL CHARACTERISTICS, VS = 5.0 V VS = 5.0 V, VCM = 2.5 V, TA = 25°C, unless otherwise noted. Table 1. Parameter DEVICE CHARACTERISTICS Output Offset Voltage Large Signal Voltage Gain Output Power Output Impedance SHUTDOWN INPUT Input Voltage High Input Voltage Low POWER SUPPLY Supply Current Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Voltage Noise Density Symbol VOS AVO POUT ZOUT VIH VIL IS IS SR GBP Фo en RL = 100 kΩ, CL = 50 pF IS < 100 μA I S > 1 mA BTL mode SE mode 2.0 0.8 6.4 6.4 60 4 4 84 45 Conditions BTL mode; AV = 2; BTL+ to BTL− RL = 2 kΩ SE mode: RL = 32 Ω, THD < 1% BTL mode: RL = 8 Ω, THD < 1% Min Typ 4 2 90 1,000 0.1 Max 100 Unit mV V/mV mW mW Ω V V mA mA μA V/μs MHz Degrees nV/√Hz f = 1 kHz ELECTRICAL CHARACTERISTICS, VS = 2.7 V VS = 2.7 V, VCM = 1.35 V, TA = 25°C, unless otherwise noted. Table 2. Parameter DEVICE CHARACTERISTICS Output Offset Voltage Large Signal Voltage Gain Output Power Output Impedance SHUTDOWN INPUT Input Voltage High Input Voltage Low POWER SUPPLY Supply Current Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Voltage Noise Density Symbol VOS AVO POUT ZOUT VIH VIL IS IS SR GBP Фo en RL = 100 kΩ, CL = 50 pF IS < 100 μA I S > 1 mA BTL mode SE mode 2.0 0.8 6.4 6.4 32 4 4 84 45 Conditions BTL mode; AV = 2; BTL+ to BTL− RL = 2 kΩ SE mode: RL = 32 Ω, THD < 1% BTL mode: RL = 8 Ω, THD < 1% Min Typ 4 2 25 300 0.1 Max 100 Unit mV V/mV mW mW Ω V V mA mA μA V/μs MHz Degrees nV/√Hz f = 1 kHz Rev. A | Page 3 of 12 SSM2250 ABSOLUTE MAXIMUM RATINGS Table 3. Parameter Supply Voltage Differential Input Voltage 1 Common-Mode Input Voltage ESD Susceptibility Storage Temperature Range All Packages Operating Temperature Range All Packages Junction Temperature Range All Packages Lead Temperature Range (Soldering, 60 sec) 1 Rating 6V ±5 V ±6 V 2000 V −65°C to +150°C Stresses above those indicated under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 4. −40°C to +85°C −65°C to +165°C 300°C Package Type 10-Lead MSOP (RM) 14-Lead TSSOP (RU) 1 θJA 1 200 180 θJC 44 35 Unit °C/W °C/W Differential input voltage or ±VS, whichever is lower. θJA is specified for worst-case conditions; that is, θJA is specified for the device soldered in circuit board for surface mount packages. ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Rev. A | Page 4 of 12 SSM2250 TYPICAL PERFORMANCE CHARACTERISTICS 10 1 TOTAL HARMONIC DISTORTION (–%) VS = 5V BTL MODE RL = 8Ω CB = 1μF POUT = 1W AV = 2 TOTAL HARMONIC DISTORTION (%) VS = 5V SE MODE RL = 32Ω CB = 1μF POUT = 60mW AV = 1 0.1 1 00359-004 0.1 20 100 1k FREQUENCY (Hz) 10k 20k 0.01 20 100 1k FREQUENCY (Hz) 10k 20k Figure 4. BTL Out THD + N vs. Frequency 10 VS = 2.7V BTL MODE RL = 8Ω CB = 1μF POUT = 0.25W AV = 2 1 Figure 7. SE Out THD + N vs. Frequency TOTAL HARMONIC DISTORTION (%) 1 TOTAL HARMONIC DISTORTION (%) VS = 2.7V SE MODE RL = 32Ω CB = 1μF POUT = 15mW AV = 1 0.1 00359-005 0.1 20 100 1k FREQUENCY (Hz) 10k 20k 0.01 20 100 1k FREQUENCY (Hz) 10k 20k Figure 5. BTL Out THD + N vs. Frequency Figure 8. SE Out THD + N vs. Frequency 10 VS = VARIES BTL MODE RL = 8Ω CB = 1μF VIN = 1kHz AV = 2 2.7V 3.3V TOTAL HARMONIC DISTORTION (%) 10 SE MODE RL = 32Ω CB = 1μF VIN = 1kHz 1 2.7V 3.3V 5V TOTAL HARMONIC DISTORTION (%) 1 0.1 00359-006 5.0V 0.1 10m 100m OUTPUT POWER (W) 1 2 0.01 10 OUTPUT POWER (mW) 100 200 Figure 6. THD + N vs. Output Power Figure 9. BTL Out THD + N vs. Output Power Rev. A | Page 5 of 12 00359-009 00359-008 00359-007 SSM2250 10 VS = 5V BTL MODE R L = 8Ω CB = 1μF VIN = 20Hz AV = 2 10 VS = 5V SE MODE RL = 32Ω CB = 1μF VIN = 20Hz AV = 1 TOTAL HARMONIC DISTORTION (%) TOTAL HARMONIC DISTORTION (%) 00359-010 1 1 0.1 0.1 10m 100m OUTPUT POWER (W) 1 2 0.01 10 OUTPUT POWER (W) 100 200 Figure 10. BTL Out THD + N vs. Output Power at 20 Hz 10 VS = 5V BTL MODE RL = 8Ω CB = 1μF VIN = 20kHz AV = 2 10 Figure 12. SE Out THD + N vs. Output Power at 20 Hz TOTAL HARMONIC DISTORTION (%) TOTAL HARMONIC DISTORTION (%) 1 VS = 5V SE MODE RL = 8Ω CB = 1μF VIN = 20kHz AV = 1 1 0.1 00359-011 0.1 10m 100m OUTPUT POWER (mW) 1 2 0.01 10 OUTPUT POWER (mW) 100 200 Figure 11. BTL Out THD + N vs. Output Power at 20 kHz Figure 13. SE Out THD + N vs. Output Power at 20 kHz Rev. A | Page 6 of 12 00359-013 00359-012 SSM2250 PRODUCT OVERVIEW The SSM2250 is a low distortion power amplifier that can drive a set of stereo headphones or a single 8 Ω loudspeaker. It contains three rail-to-rail output op amps, click-and-pop reduction biasing, and all necessary switching circuitry. In SE (singleended) mode, the device automatically mutes the internal 8 Ω speaker. In BTL (bridge-tied load) mode, the internal speaker is activated. The SSM2250 can operate from a 2.7 V to a 5.5 V single supply. The rail-to-rail outputs can be driven to within 400 mV of either supply rail while supplying a sustained output current of 350 mA into 8 Ω. The device is unity-gain stable and requires no external compensation capacitors. The SSM2250 can be configured for gains of up to 40 dB. In BTL mode, the SSM2250 can achieve 1 W continuous output into 8 Ω at ambient temperatures up to 40°C. The power derating curve shown in Figure 17 should be observed for proper operation at higher ambient temperatures. For a standard 14-lead TSSOP package, typical junction-to-ambient temperature thermal resistance (θJA) is 180°C/W on a 2-layer board and 140°C/W on a 4-layer board. Internal Speaker/External Headphones Automatic Switching Pin 4 on the SSM2250 controls the switching between the BTL mode and the SE mode. Logic low to Pin 4 activates BTL mode, while logic high activates SE mode. The configuration shown in Figure 14 provides the appropriate logic voltages to Pin 4, muting the internal speaker when headphones are plugged into the jack. A stereo headphone jack with a normalizing pin is required for the application. With no plug inserted, a mechanical spring connects the normalizing pin to the output pin in the jack. Once a plug is inserted, this connection is broken. In Figure 14, Pin 4 of the SSM2250 is connected to the normalizing pin for the right channel output. This pin, located in the headphone jack, hits the ring on the headphone plug. A 100 kΩ pull-up resistor to 5 V is also connected at this point. With a headphone plug inserted, the normalizing pin disconnects from the output pin, and Pin 4 is pulled up to 5 V, activating SE mode on the SSM2250. This mutes the internal speaker while driving the stereo headphones. Once the headphone plug is removed, the normalizing pin connects to the output pin. This drives the voltage at Pin 4 to 50 mV, as this point is pulled low by the 1 kΩ resistor now connected to the node. The SSM2250 goes into BTL mode, deactivating the right SE amplifier to prevent the occurrence of any false mode switching. It is important to connect Pin 4 and the 100 kΩ pull-up resistor to the normalizing pin for the right output in the headphone jack. Connecting them to the left output normalizing pin results in improper operation from the device. The normalizing pin to the left output in the headphone jack should be left open. TYPICAL APPLICATION In SE mode, the device operates similarly to a high current output, dual op amp. A1 and A3 are independent amplifiers with a gain of −R2/R1. The outputs of A1 and A3 are used to drive the external headphones plugged into the headphone jack. Amplifier A2 is shut down to a high output impedance state. This prevents current from flowing through the 8 Ω internal speaker, thereby muting it. Although the gains of A1 and A3 can be set independently, it is recommended that the feedback and feedforward resistor around both amplifiers be equal. This prevents one channel from becoming louder than the other. In BTL mode, the current into the right in pin is directed to the input of A1. This effectively sums the left in and right in audio signals. The A2 amplifier is activated and configured with a fixed gain of AV = −1. This produces a balanced output configuration that drives the internal speaker. Because the BTL output voltages swing opposite to each other, the gain to the speaker in BTL mode is twice the gain of SE mode. The voltage across the internal speaker can be written VSPEAKER = VLEFT + VRIGHT × 2 × ( ) R2 R1 (1) The bridged output configuration offers the advantage of a more efficient power transfer from the input to the speaker. Because both outputs are symmetric, the dc voltage bias across the 8 Ω internal speaker is 0. This eliminates the need for a coupling capacitor at the output. In BTL mode, the A3 amplifier is shut down to conserve power. Coupling Capacitors Output coupling capacitors are not required to drive the internal speaker from the BTL outputs. However, coupling capacitors are required between the amplifier’s SE outputs and the headphone jack to drive external headphones. This prevents dc current from flowing through the headphone speakers, whose resistances are typically about 80 Ω. Rev. A | Page 7 of 12 SSM2250 R2 20kΩ R1 20kΩ LEFT IN SHUTDOWN 1μF NC 1 2 3 4 14 13 NC – 5V 10μF + 220μF + BTL 1kΩ OUT NC SSM2250 12 11 10 9 8 R1 20kΩ RIGHT IN 1μF NC 5 6 7 220μF + 1kΩ NC 5V 100kΩ NC = NO CONNECT Figure 14. Typical Application The output coupling capacitor creates a high-pass filter with a cutoff frequency of f − 3 dB = 1 2 πRL CC The SSM2250 has excellent phase margin and is stable even under heavy loading. Therefore, a feedback capacitor in parallel with R2 is not required, as it is in some competitors’ products. (2) Power Dissipation An important advantage in using a bridged output configuration is that bridged output amplifiers are more efficient than single-ended amplifiers in delivering power to a load. 1.50 VDD = 5V 1.25 POWER DISSIPATION (W) where: RL is the resistance of the headphone. CC is the output coupling capacitor. Although a majority of headphones have approximately 80 Ω of resistance, the resistance can vary between models and manufacturers. Headphone resistances are commonly between 32 Ω to 600 Ω. Using a 220 μF capacitor, as shown in Figure 14, the worst-case −3 dB corner frequency would be 22 Hz, with a 32 Ω headphone load. Smaller output capacitors could be used at the expense of low frequency response to the headphones. An input coupling capacitor should be used to remove dc bias from the inputs to the SSM2250. Again, the input coupling capacitor in combination with the input resistor creates a highpass filter with a corner frequency of f − 3 dB = 1 2 πR1C1 00359-014 R2 20kΩ RL = 4Ω 1.00 0.75 0.50 RL = 8Ω 0.25 0 0 0.25 0.50 0.75 1.00 OUTPUT POWER (W) 1.25 1.50 (3) Figure 15. Power Dissipation vs. Output Power in BTL Mode Using the values shown in Figure 14, where R1 = 20 kΩ and C1 = 1 μF, creates a corner frequency of 8 Hz. This is acceptable, as the PC99 audio requirement specifies the computer audio system bandwidth to be 20 Hz to 20 kHz. Pin 10 on the SSM2250 provides the proper bias voltage for the amplifiers. A 0.1 μF capacitor should be connected here to reduce sensitivity to noise on the power supply. A larger capacitor can be used if more rejection from power supply noise is required. PDISS , MAX = 2VDD 2 π2 RL 00359-015 RL = 16Ω (4) Using Equation 4 and the power derating curve in Figure 17, the maximum ambient temperature can be easily found. This ensures that the SSM2250 does not exceed its maximum junction temperature of 150°C. The power dissipation for a single-ended output application where an output coupling capacitor is used is shown in Figure 16. Rev. A | Page 8 of 12 SSM2250 0.35 VDD = 5V 0.3 RL = 4Ω POWER DISSIPATION (W) Solving for Maximum Ambient Temperature To protect the SSM2250 against thermal damage, the junction temperature of the die should not exceed 150°C. The maximum allowable ambient temperature of the application can be easily found by solving for the expected maximum power dissipation in Equation 4 and Equation 5, and using Equation 8. Continuing from the previous example, the θJA of the SSM2250 14-lead TSSOP package on a 4-layer board is 140°C/W. To ensure that the SSM2250 die junction temperature stays below 150°C, the maximum ambient temperature can be solved using Equation 8. 0.25 0.2 0.15 0.1 0.05 0 0 0.1 0.2 OUTPUT POWER (W) 0.3 RL = 16Ω RL = 8Ω 0.4 00359-016 Figure 16. Power Dissipation vs. Single-Ended Output Power (VDD = 5 V) TAMB, MAX = + 150 o C − θ JA × PDISS, MAX = + 61 C o = + 150 o C − (140 o C /W × 0.633 W ) (8) The maximum power dissipation for a single-ended output is PDISS, MAX = VDD 2π 2 R L 2 (5) The maximum ambient temperature must remain below 61°C to protect the device against thermal damage. Another method for finding the maximum allowable ambient temperature is to use the power derating curve in Figure 17. The y-axis corresponds to the expected maximum power dissipation, and the x-axis is the corresponding maximum ambient temperature. Either method returns the same answer. 1.0 TJMAX = 150°C/W FREE AIR NO HEAT SINK Because the SSM2250 is designed to drive two single-ended loads simultaneously, the worst-case maximum power dissipation in SE mode is twice the value of Equation 5. A thorough mathematical explanation behind Equation 4 and Equation 5 is provided in the SSM2211 data sheet. Example POWER DISSIPATION (W) Given worst-case stereo headphone loads of 32 Ω, the maximum power dissipation of the SSM2250 in SE mode with a 5 V supply is PDISS , MAX = 0.8 14-LEAD TSSOP θJA = 140°C/W 10-LEAD MSOP θJA = 180°C/W (5 V )2 2π 2 32 Ω 0.6 = 79 mW (6) 0.4 With an 8 Ω internal speaker attached, the maximum power dissipation in BTL mode is (from Equation 4) PDISS , MAX = 2 × (5 V )2 π2 8 Ω = 633 mW 0.2 00359-017 (7) 0 0 25 50 75 AMBIENT TEMPERATURE (°C) 100 It can easily be seen that power dissipation from BTL mode operation is of greater concern than SE mode. Figure 17. Maximum Power Dissipation vs. Ambient Temperature Maximum Output Power The maximum amount of power that can be delivered to a speaker is a function of the supply voltage and the resistance of the speaker. Figure 17 shows the maximum BTL output power possible from the SSM2250. Maximum output power is defined as the point at which the output has greater than 1% distortion. Rev. A | Page 9 of 12 SSM2250 1.6 1.4 Speaker Efficiency and Loudness RL = 4Ω MAXIMUM OUTPUT @ THD 1% (W) 1.2 1.0 0.8 0.6 0.4 0.2 0 1.5 RL =8Ω RL = 16Ω 00359-018 The effective loudness of 1 W of power delivered into an 8 Ω speaker is a function of the efficiency of the speaker. The efficiency of a speaker is typically rated at the sound pressure level (SPL) at 1 meter in front of the speaker with 1 W of power applied to the speaker. Most speakers are between 85 dB and 95 dB SPL at one meter at 1 W of power. Table 5 shows a comparison of the relative loudness of different sounds. Table 5. Typical Sound Pressure Levels Source of Sound Threshold of Pain Heavy Street Traffic Cabin of Jet Aircraft Average Conversation Average Home at Night Quiet Recording Studio Threshold of Hearing dB SPL 120 95 80 65 50 30 0 2.0 2.5 3.0 3.5 4.0 SUPPLY VOLTAGE (V) 4.5 5.0 Figure 18. Maximum BTL Output Power vs. VS Use Figure 18 to find the minimum supply voltage needed to achieve a specified maximum undistorted output power. The output power in SE mode is exactly one-fourth the equivalent output power in BTL mode. This is because twice the voltage swing across the two BTL outputs results in 4 × the power delivered to the load. Figure 19 shows the maximum output power in SE mode vs. supply voltage for various headphone loads. 100 It can easily be seen that 1 W of power into a speaker can produce quite a bit of acoustic energy. Shutdown Feature The SSM2250 can be put into a low power consumption shutdown mode by connecting Pin 3 to VDD. In shutdown mode, the SSM2250 has low supply current of 60 μA. Pin 3 should be connected to ground for normal operation. Connecting Pin 3 to VDD shuts down all amplifiers and puts all outputs into a high impedance state, effectively muting the SSM2250. A pull-up or pull-down resistor is not required. Pin 3 should never be left floating, as this could produce unpredictable results. MAXIMUM OUTPUT @ THD 1% (mW) 75 RL = 32Ω 50 RL = 64Ω PC99-Compliant Computer Audio Reference Design 25 RL = 128Ω 00359-019 The schematic shown in Figure 20 is a reference design for a complete audio system in a computer. The design is compliant with the PC99 standard for computer audio. The AD1881A is an AC’97, version 2.1, audio codec, available from Analog Devices. The stereo output from the AD1881A is coupled into the SSM2250, which is used to drive a mono internal speaker and stereo headphones. The internal speaker switching is controlled by the SSM2250 through the normalizing pin on the headphone jack. The AD1881A controls the shutdown pin on the SSM2250, and is activated through the power management software drivers installed on the computer. For more information, refer to the AD1881A data sheet. 0 1.5 2.0 2.5 3.0 3.5 4.0 SUPPLY VOLTAGE (V) 4.5 5.0 Figure 19. Maximum SE Output Power vs. VS Example An application requires only 500 mW to be output in BTL mode into an 8 Ω speaker. By inspection, the minimum supply voltage required is 3.3 V. Rev. A | Page 10 of 12 SSM2250 R1 20kΩ TO SPEAKER– AVDD = 5V R2 100Ω NC SSM2250 1 2 3 4 5 6 14 13 12 TO SPEAKER+ NC C1 10μF + R3 1kΩ C4 10μF + NC AVDD = 5V 11 10 9 8 AVDD = 5V C5 100μF + R4 1kΩ NC C6 10μF C7 0.1μF C2 10μF C3 0.1μF 7 NC R5 20kΩ AC CLK C8 22pF 1 NC 48 47 NC NC NC NC 46 45 44 43 42 NC NC NC 41 40 39 38 37 MONO OUT C9 36 R6 20kΩ R7 20kΩ LINE OUT RIGHT C12 0.1μF C13 0.047μF C15 1μF C16 270pF C17 270pF LINE OUT LEFT C11 22pF Y1 24.576MHz SMT 1μF 2 3 4 5 6 35 34 33 32 C10 1μF SDATA OUT BITCLK C14 1μF C20 27pF SDATA IN 0 R8 47Ω AD1881A 7 8 9 31 30 29 28 27 26 25 SYNC RST# R10 10kΩ C23 0.1μF C22 1μF R11 1kΩ 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 C16 10μF C21 0.1μF AVDD = 5V R9 2kΩ C19 0.1μF PCBEEP C24 1μF C25 1μF C27 1μF LINE IN RIGHT NC NC C26 1μF NC MONO PHONE R12 4.7kΩ R14 4.7kΩ R16 4.7kΩ R17 4.7kΩ C31 1μF C29 1μF LINE IN LEFT MIC IN C30 1μF C28 0.001μF R13 4.7kΩ CD RIGHT C32 1μF R15 4.7kΩ CD GND C33 1μF R18 4.7kΩ 00359-020 AUX LEFT AUX IN NC = NO CONNECT R19 4.7kΩ CD LEFT Figure 20. PC99 Compliant Audio System Reference Design Rev. A | Page 11 of 12 SSM2250 OUTLINE DIMENSIONS 3.00 BSC 10 6 3.00 BSC 1 5 4.90 BSC PIN 1 0.50 BSC 0.95 0.85 0.75 0.15 0.00 0.27 0.17 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-BA 1.10 MAX 8° 0° 0.80 0.60 0.40 SEATING PLANE 0.23 0.08 Figure 21. 10-Lead Mini Small Outline Package [MSOP] (RM-10) Dimensions shown in millimeters 5.10 5.00 4.90 14 8 4.50 4.40 4.30 1 7 6.40 BSC PIN 1 1.05 1.00 0.80 0.65 BSC 1.20 MAX 0.15 0.05 0.30 0.19 0.20 0.09 8° 0° 0.75 0.60 0.45 SEATING COPLANARITY PLANE 0.10 COMPLIANT TO JEDEC STANDARDS MO-153-AB-1 Figure 22. 14-Lead Thin Shrink Small Outline Package [TSSOP] (RU-14) Dimensions shown in millimeters ORDERING GUIDE Model SSM2250RM-R2 SSM2250RM-REEL SSM2250RMZ-R2 1 SSM2250RMZ-REEL1 SSM2250RU-REEL SSM2250RUZ-REEL1 1 Temperature Range −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C Package Description 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP 10-Lead MSOP 14-Lead TSSOP 14-Lead TSSOP Package Option RM-10 RM-10 RM-10 RM-10 RU-14 RU-14 Branding AK AK AK# AK# Z = Pb-free part, # denotes Pb-free part; may be top or bottom marked. © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C00359–0–6/05(A) Rev. A | Page 12 of 12