CMAMP110

CMAMP110 CALMIRCO | Alldatasheet

Document overview

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Technical content

Features

• Microsoft PC99 & PC2001 compliant  Differential and Single-ended Microphone Inputs  Internally frequency compensated for unity gain  20dB DC voltage gain (maximum)  Buffered DC bias voltage for external microphone  Very low supply current (< 3.0 mA)  20K Ω minimum input impedance  Low Total Harmonic Distortion (0.03% at

1 KHz typical)

 Small MSOP package  Lead-free version available

Applications

 Computers  Mobile Phones P D A ' s  MP3 Players  Digital Cameras  Video Tape Recorders Product Description The CMAMP110 Microphone Amplifier selects (via MIC_SELECT) between and amplifies Internal and External Microphone input signals. The device is designed to be compliant with Microsoft PC99 and PC2001 specifications. The CMAMP110 contains the equivalent of 7 operational amplifiers and 19 precision resistors, and is intended for use in PC audio applica- tions. The Internal Microphone input is differential, but it can also be used single-ended by simply grounding one of the inputs through a capacitor. The External Microphone input is single-ended. A logic high level on the MIC_SELECT pin selects the external microphone input. Since the chip supplies the DC bias for the exter- nal microphone (EXT_MIC_BIAS), both dynamic and electret type microphones may be used. The output amplifier is unity gain stable and is capable of driving a resistive load in excess of 10KΩ. The CMAMP110 Microphone Amplifier is housed in a space saving MSOP-8 package and is optionally avail- able with lead-free finishing. Electrical Schematic VREF MIC_SELECT INT_MIC− INT_MIC+ EXT_MIC_IN VOUT EXT_MIC_BIAS SW1 SW2 500K500K 500K500K 500K 500K 3 2.5K RBIAS

© 2004 California Micro Devices Corp. All rights reserved. 2 430 McCarthy Blvd., Milpitas, California 95035 LTel: (408) 263-3214 L Fax: (408) 263-7846 L www.calmicro.com 01/09/04 CMAMP110

Ordering Information

Note 1: Parts are shipped in Tape & Reel form unless otherwise specified. PIN DESCRIPTIONS PIN NAME DESCRIPTION 1 MIC_SELECT Microphone Select logic input control. The external microphone input is selected when the MIC_SELECT signal (pin 1) is at Logic "1" (> 3.5 volts), and the internal microphone inputs are selected by applying Logic "0" to the pin (< 1.5V). 2V OUT Amplifier output pin. 3 EXT_MIC_BIAS External microphone bias output. 4 V+ Positive supply pin. 5I N T _ M I C − Inverting internal microphone differential input. Can be operated as a single-ended input by connecting a 0.22 µF (or greater) capacitor between pin 6 and V−. 6 INT_MIC+ Non-inverting internal microphone differential input. Can be operated as a single-ended input by connecting a 0.22µF (or greater) capacitor between pin 5 and V−. 7V − Negative supply pin. 8 EXT_MIC_IN External microphone signal input. PACKAGE / PINOUT DIAGRAM Note: This drawing is not to scale. 8-pin MSOP MIC_SELECT VOUT EXT_MIC_BIAS EXT_MIC_IN V INT_MIC+ INT_MIC− Top View PART NUMBERING INFORMATION Pins Package Standard Finish Lead-free Finish Ordering Part Number1 Part Marking Ordering Part Number1 Part Marking

8 MSOP-8 CMAMP110M A110 CMAMP110MR R110

© 2004 California Micro Devices Corp. All rights reserved. 01/09/04 430 McCarthy Blvd., Milpitas, California 95035 L Tel: (408) 263-3214 L Fax: (408) 263-7846 L www.calmicro.com 3 CMAMP110 Specifications Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and the test conditions, see the Electrical Operating Characteristics. Note 2: Human Body Model, 1.5K Ω in series with 100pF (MIL-STD-883, Method 3015). Note 3: Continuous short circuit operation at elevated ambient temperatures can result in exceeding the maximum allowed junction temperature of 150°C. Note 1: Operating conditions indicate ratings for which the device is intended to be functional, but specific performance is not guar- anteed. For guaranteed specifications and the test conditions, see the Electrical Operating Characteristics. ABSOLUTE MAXIMUM RATINGS(SEE NOTE 1) PARAMETER RATING UNITS ESD Protection (HBM, Note 2) + 2000 V Differential Input Voltage +/ − Supply Voltage V Voltage at any Input/Output Pin [(V −) - 0.3] to [(V+) + 0.3] V Storage Temperature Range -40 to +150 °C Junction Operating Temperature +125 °C Lead Soldering Temperature (10 seconds) +260 °C Supply Voltage Current at Input Pin 5m A Current at Output Pin (Note 3) 15 mA Current at Power Supply Pin 15 mA STANDARD OPERATING CONDITIONS(SEE NOTE 1) PARAMETER RATING UNITS Maximum Power Dissipation 200 mW Ambient Operating Temperature Range 0 to +70 °C Supply Voltage 3.3 to 5.5 V

© 2004 California Micro Devices Corp. All rights reserved. 4 430 McCarthy Blvd., Milpitas, California 95035 LTel: (408) 263-3214 L Fax: (408) 263-7846 L www.calmicro.com 01/09/04 CMAMP110 Specifications (cont’d) Note 1: All tests at 25°C, V+ = +5V, V- = 0V unless otherwise noted. ELECTRICAL OPERATING CHARACTERISTICS(SEE NOTE 1) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS RIN Input Impedance All Inputs 20 40 K Ω AV AC Voltage Gain V IN = 100 mV rms, RL=10KΩ 18 20 dB VMIC_IN Microphone Input Signal Level 110 mV rms VOUT Output Signal Level R L=10KΩ 1V r m s VEXT_MIC_BIAS External Microphone Bias Voltage No Load I SOURCE = 0.8mA 2.0 4.6 2.6 V V RBIAS Microphone Bias Resistor 2.0 2.5 K Ω GBW Gain Bandwidth Product R L=10KΩ 2.0 MHz SR Slew Rate R L=10KΩ 1.3 V/µs T.H.D. Total Harmonic Distortion f = 1KHz, V IN = 100mV rms, RL=10KΩ 0.03 % VIH MIC_SELECT Logic High Voltage 3.5 V VIL MIC_SELECT Logic Low Voltage 1.5 V tSW Microphone Switching Time 2 µs ISUP Supply Current 1.5 3.0 mA ISC Output Short Circuit Current V OUT = 0V 15 mA RL Load Impedance Applied to VOUT 10 K Ω

© 2004 California Micro Devices Corp. All rights reserved. 01/09/04 430 McCarthy Blvd., Milpitas, California 95035 L Tel: (408) 263-3214 L Fax: (408) 263-7846 L www.calmicro.com 5 CMAMP110

Application Information

CMAMP110 Design Considerations 1. General Overview The CMAMP110 is very straightforward to apply, but a few precautions are worth noting. It is recommended that the power supply pin, V+ (pin 4), be bypassed with a parallel combination of a 4.7µF and a 0.1µF capacitor to minimize noise and hum pickup. In addition, a 100 Ω resistor may be inserted in series to form a RC filter between the the power supply feed and the V+ pin to the CMAMP110. Also, in that regard, lead dress for the microphone inputs on the PCB should either be shielded from or spaced from noise sources. The V input on the device (pin 7) should be connected to the “clean analog ground”. 2. Passive Component Selection Selection of the microphone input coupling capacitors can be made using the following equation: Where: RIN = Microphone Input Impedance (40KΩ typical) ƒMIN = Minimum Input Frequency For example, for ƒMIN = 20Hz, C should be selected for 0.22µF (or greater). The above equation may also be used to select the output coupling capacitor. 3. Microphone Bias The CMAMP110 provides a nominal 4.6 volt stable ref- erence and 2.5KΩ resistor to bias the microphone. For a bias current of 800µA, a 2.6 volt bias voltage results. However, if other voltages are desired, a resistor can be inserted in series with the microphone bias output (pin 3) whose value, R EXT , can be chosen using the following equation: Where: VBMIC = 4.6 volts RBIAS = 2.5 KΩ VB = Desired Microphone Bias Voltage IB = Microphone Bias Current For example, an electret condenser microphone that operates on 1.5V and 0.5mA, REXT should be selected to be 3.9KΩ (nearest standard value). 4. Microphone Select The CMAMP110 has provisions for the selection of either the internal microphone and external micro- phone inputs. The external microphone is selected when the MIC_SELECT signal (pin 1) is at Logic "1" (> 3.5 volts), and the internal microphone is selected by applying Logic "0" to the pin (< 1.5V). The switching time is approximately 2 ms. For static applications where only one input is used, pin 1 can simply be strapped to either V − or V+. 5. Internal Microphone The CMAMP110 provides for a differential (floating) input for the Internal microphone where INT_MIC+ (pin 6) is the “non-inverting” input and INT_MIC − (pin 5) is the “inverting” input. The CMAMP110 may be operated single-ended by connecting a 0.22 µF (or greater) capacitor between either pin 5 or pin 6 and V 6. Start Up the inputs and outputs (see Passive Component Selec- tion). Both the Internal Microphone inputs (INT_MIC+ and INT_MIC −) and the External Microphone input (EXT_MIC_IN) are DC biased at half the supply volt- age with an equivalent impedance of about 500K Ω. As a result, a start up transient will occur as the capacitors charge to half of the rail. The time for the amplifier inputs and outputs to settle is given by: C 1 REXT VBMIC IB RBIAS⋅()– VB– IB

© 2004 California Micro Devices Corp. All rights reserved. Figure 1. CMAMP110 Typical Application Circuit (single-ended input configuration shown for differential INT_MIC inputs).

© 2004 California Micro Devices Corp. All rights reserved. 01/09/04 430 McCarthy Blvd., Milpitas, California 95035 L Tel: (408) 263-3214 L Fax: (408) 263-7846 L www.calmicro.com 7 CMAMP110 Mechanical Details MSOP Mechanical Specifications: CMAMP110 devices are packaged in 8-pin MSOP packages. Dimensions are presented below. For complete information on the MSOP-8 package, see the California Micro Devices MSOP Package Infor- mation document. * This is an approximate number which may vary. Package Dimensions for MSOP-8 PACKAGE DIMENSIONS Package MSOP Pins 8 Dimensions Millimeters Inches Min Max Min Max A 0.87 1.17 0.034 0.046 A1 0.05 0.25 0.002 0.010 B 0.30 (typ) 0.012 (typ) C 0.18 0.007 D 2.90 3.10 0.114 0.122 E 2.90 3.10 0.114 0.122 e 0.65 BSC 0.025 BSC H 4.78 4.98 0.188 0.196 L 0.52 0.54 0.017 0.025 # per tube 80 pieces* # per tape and reel 4000 pieces Controlling dimension: inches Mechanical Package Diagrams E D H 1234 8765 TOP VIEW L END VIEW C eB A A1SEATING PLANE SIDE VIEW Pin 1 Marking