Datasheet CMX655A, CMX655D (CML Microcircuits) - 7

Ultra-Low Power Voice Codec CMX655D/CMX655A
2 Block Diagram 2.1 CMX655A
BIAS VDD_A DGND VDD_AD PLL & Bandgap Analogue Digital Thermal ANALOGUE DIGITAL MOSI/A1 PORs Low Power & Bias Regulator Regulator Monitor SPI/TWI MISO/SDA Oscillator Slave SCLK/SCL Interface CSN/A0 SPIS Microphone Interface Audio Signal Processing RSTN Control & +9dB to +40dB IRQN Timing (1dB steps) Level RCLK Logic Detect LIN PGL ADCL Voice Filters Decimator Noise Mic +9dB to +40dB GL/GR Gate Mux (1dB steps) RIN PGR ADCR -12dB to +3dB (1dB steps) DSTS LRCLK/FS Decimator Sidetone VREF Serial BCLK VCM AGC Audio Interface SDO DSTG -62dB to 0dB (2dB steps) SDI Class-D Amplifier VDD_PA1/2 Voice Filters VSS_PA1/2 AOUTN Noise Amp PA PWM VOL ALC PRE AOUTP Shaper Mux Level Interpolator LOUT -90dB to 0dB 0dB to +12dB 0dB, +6dB, Shift (1dB steps) (1dB steps) +12dB, +18dB Lineout Filter
Figure 3 CMX655A Block Diagram 2.2 CMX655D
BIAS VDD_A DGND VDD_AD1/2 PLL & Bandgap Analogue Digital Thermal ANALOGUE DIGITAL MOSI/A1 PORs Low Power & Bias Regulator Regulator Monitor SPI/TWI MISO/SDA Oscillator Slave SCLK/SCL Interface CSN/A0 SPIS Microphone Interface Audio Signal Processing RSTN Control & IRQN Timing Level RCLK Logic Detect MICCLK Voice Filters Digital Decimator Noise Mic Microphone GL/GR Gate Mux Interface MICDI -12dB to +3dB (1dB steps) DSTS LRCLK/FS Decimator Sidetone Serial BCLK Audio Interface SDO DSTG -62dB to 0dB (2dB steps) SDI Class-D Amplifier VDD_PA1/2 Voice Filters VSS_PA1/2 AOUTN Noise Amp PA PWM VOL ALC PRE AOUTP Shaper Mux Level Interpolator LOUT -90dB to 0dB 0dB to +12dB 0dB, +6dB, Shift (1dB steps) (1dB steps) +12dB, +18dB Lineout Filter
Figure 4 CMX655D Block Diagram
 2018 CML Microsystems Plc 7 D/655/3 Document Outline Datasheet Front Page 1 Brief Description 2 Block Diagram 2.1 CMX655A 2.2 CMX655D 3 Pin List 3.1 CMX655A 3.2 CMX655D 4 External Components 4.1 CMX655A 4.1.1 Power Supply and Pin Decoupling 4.1.2 SPI 4.1.3 TWI 4.1.4 Speaker and Microphone 4.2 CMX655D 4.2.1 Power Supply and Pin Decoupling 4.2.2 SPI 4.2.3 TWI 4.2.4 Speaker and Microphone 5 General Description 5.1 Power Management 5.1.1 External Supplies 5.1.2 Regulated Supplies 5.2 Device Reset 5.2.1 Power-On-Reset 5.2.2 Reset Pin 5.3 Main Clock 5.3.1 Clock Frequency 5.3.2 Clock Generation 5.3.3 PLL 5.3.4 Low Power Oscillator 5.3.5 Clock Control Registers 5.3.5.1 CLKCTRL ($03) 5.3.5.2 RDIVHI ($04) 5.3.5.3 RDIVLO ($05) 5.3.5.4 NDIVHI ($06) 5.3.5.5 NDIVLO ($07) 5.3.5.6 PLLCTRL ($08) 5.4 Microphone Interface 5.4.1 Digital Microphone Interface 5.4.2 Analogue Microphone Interface 5.5 Class-D Amplifier 5.5.1 Audio Outputs 5.5.2 Overload Current Protection 5.5.3 Thermal Protection 5.5.4 Clipping Detection 5.6 Audio Signal Processing 5.6.1 Record Level Control 5.6.1.1 Record Level Control Register 5.6.2 Automatic Gain Control 5.6.2.1 AGC Registers 5.6.3 Noise Gate 5.6.3.1 Noise Gate Registers 5.6.4 Record Level Detection 5.6.4.1 Record Level Detection Registers 5.6.5 Playback Preamplifier Gain 5.6.5.1 Playback Preamplifier Gain Register 5.6.6 Playback Volume Control 5.6.6.1 Playback Volume Register 5.6.7 Automatic Level Control 5.6.7.1 ALC Registers 5.6.8 Digital Sidetone 5.6.8.1 Digital Sidetone Register 5.6.9 Voice Filters 5.6.9.1 Low Pass Filter 5.6.9.2 DC Blocking Filter 5.6.9.3 High Pass Filter 5.6.9.4 Voice Filters Registers 5.6.10 Channel Multiplexing 5.6.11 Click-and-Pop Reduction 5.6.11.1 Click-and-Pop Reduction Register 5.7 Control Interface 5.7.1 SPI Slave 5.7.2 TWI Slave 5.8 Serial Audio Interface 5.8.1 I2S Mode 5.8.2 Left-Justified Mode 5.8.3 PCM Mode 5.8.4 Audio Companding 5.8.5 Serial Audio Interface Registers 5.9 Interrupt Status and IRQN Pin 5.9.1 Interrupt Registers 5.10 System Control 5.10.1 System Control Registers 5.11 Register Address Map 6 Application Notes 6.1 Programming Examples 6.1.1 Start-up 6.1.2 DC-offset Calibration 6.1.3 Configuration 6.1.4 Enable Audio Channels 6.1.5 Shutdown 7 Performance Specification 7.1 Electrical Performance 7.1.1 Absolute Maximum Ratings 7.1.2 Operating Limits 7.1.3 Operating Characteristics 7.1.3.1 DC Parameters 7.1.3.2 AC Parameters 7.1.3.3 SPI 7.1.3.4 TWI 7.1.3.5 SAI 7.1.3.6 Digital Microphone Interface 7.2 Typical Performance Characteristics 7.2.1 THD+N vs. Level performance 7.2.2 THD+N vs. Frequency performance 7.2.3 Class D Amplifier Efficiency 7.2.4 Filter Performance Speaker Channel 7.2.5 Filter Performance Microphone Channel 7.3 Packaging 7.3.1 CMX655D/CMX655A End of Document