CS42L55 Ultra Low Power, Stereo CODEC w/Class H Headphone Amp DIGITAL to ANALOG FEATURES ANALOG to DIGITAL FEATURES 5 mW Stereo Playback Power Consumption 3.5 mW Stereo Record Power Consumption 99 dB Dynamic Range (A-wtd) 95 dB Dynamic Range (A-wtd) -86 dB THD+N -87 dB THD+N Digital Signal Processing Engine 2:1 Stereo Input MUX Bass & Treble Tone Control, De-Emphasis Analog Programmable Gain Amplifier (PGA) Master Volume Control (+12 to -102 dB in (+12 to -6 dB in 0.5 dB steps) 0.5 dB steps) +20 dB Boost Soft-Ramp & Zero-Cross Transitions Programmable Automatic Level Control (ALC) Programmable Peak-Detect and Limiter Noise Gate for Noise Suppression Beep Generator w/Full Tone Control Programmable Threshold & Attack/Release Rates Stereo Headphone and Line Amplifiers Independent ADC Channel Control Step-Down/Inverting Charge Pump Digital Vol. Ctl. (0 to -96 dB in 1 dB steps) Class H Amplifier - Automatic Supply Adj. High-Pass Filter Disable for DC Measurements High Efficiency Pseudo Differential Inputs Low EMI Pseudo-Differential Ground-Centered Outputs SYSTEM FEATURES High HP Power Output at -75 dB THD+N 12 MHz USB Master Clock Input 2 x 20 mW Into 32 1.8 V Low Power Operation 2 x 20 mW Into 16 1.8 V Stereo Anlg. Passthrough: 3.3 mW 1.8 V 1 V Line Output 1.8 V RMS Stereo Rec. and Playback: 8.3 mW 1.8 V Analog Vol. Ctl. (+12 to -55 dB in 1 dB steps) Headphone Detect Input Analog In to Analog Out Passthrough (SYSTEM FEATURES continued on page 2) Pop and Click Suppression +1.65 V to +2.71 V +1.65 V to +2.71 V Analog/Digital Supply Charge Pump Supply Step-Down Inverting LDO Regulator +VHP -VHP Left HP ALC Beep Left 1 Output Pseudo Diff. Pseudo Diff. Input Input Right 1 Multi-bit Mono mix, Multi-bit Multi-bit Attenuator, Limiter, Bass, DAC Right HP ADC Boost, Mix ADC Left 2 Treble Adjust Output Pseudo Diff. Ground-Centered Input Amplifiers Right 2 Left Line ALC HPF Output Pseudo Diff. Input Control Port Serial Audio Port Right Line Output Level Shifter Headphone Detect +1.65 V to +3.47 V 2 IS Serial Audio I C Control Interface Supply Input/Output Copyright Cirrus Logic, Inc. 2007 NOVEMBER 07 (All Rights Reserved) CS42L55 SYSTEM FEATURES GENERAL DESCRIPTION High Performance 24-bit Converters The CS42L55 is a highly integrated, 24-bit, ultra-low Multi-bit Delta Sigma Architecture power stereo CODEC based on multi-bit delta-sigma Integrated High Efficient Power Management modulation. Both the ADC and DAC offer many features Reduces Power Consumption suitable for low power portable system applications. Step-Down Charge Pump Improves The analog input path allows independent channel Efficiency control of a variety of features. The Programmable Gain Inverting Charge Pump Accommodates Amplifier (PGA) provides analog gain with zero cross Low System Voltage by Providing Negative transitions. The ADC path includes a digital volume at- Rail for HP/Line Amp tenuator with soft ramp transitions and a programmable LDO Reg. Provides Low Digital Supply ALC and noise gate monitor the input signals and adjust Voltage the volume appropriately. An analog passthrough also exists, accommodating a lower noise, lower power ana- Digital Power Reduction log in to analog out path to the headphone and line Very Low Oversampling Rate for amplifiers, bypassing the ADC and DAC. Converters The DAC output path includes a fixed-function digital Bursted Serial Clock Providing 24 Bits per signal processing engine. Tone control provides bass Sample and treble adjustment at four selectable corner frequen- Power Down Management cies. The digital mixer provides independent volume ADC, DAC, CODEC, PGA, DSP control for both the ADC output and PCM input signal paths, as well as a master volume control. Digital vol- Analog & Digital Routing/Mixes ume controls may be configured to change on soft ramp Line/Headphone Out = Analog In (ADC transitions while the analog controls can be configured Bypassed) to occur on every zero crossing. The DAC path also in- Line/Headphone Out = ADC Out cludes de-emphasis, limiting functions and a beep Internal Digital Loopback generator delivering tones selectable across a range of Mono Mixes two full octaves. IC Control Port The Class H stereo headphone amplifier combines the efficiency of an integrated step-down and inverting IS Digital Interface Format charge pump with the linearity and low EMI of a Class Flexible Clocking Options AB amplifier. A step-down/inverting charge pump oper- Master or Slave Operation ates in two modes: +/-VCP mode or +/-(VCP/2) mode. High-Impedance Digital Output Select Based on the amplifiers output signal, internal logic au- (used for easy MUXing between CODEC tomatically adjusts the output of the charge pump, and other data sources) +VHPFILT and VHPFILT, to optimize efficiency. With 8.000, 11.029, 12.000, 16.000, 22.059, these features, the amplifier delivers a ground-centered 24.000, 32.000, 44.118 and 48.000 kHz output with a large signal swing even at low voltages Sample Rates and eliminates the need for external DC-blocking capacitors. APPLICATIONS These features make the CS42L55 the ideal solution for HDD & Flash-Based Portable Audio Players portable applications that require extremely low power MD Players/Recorders consumption in a minimal amount of space. PDAs The CS42L55 is available in a 36-pin QFN package for Personal Media Players the Commercial (-40C to +85C) grade. The CDB42L55 Customer Demonstration board is also Portable Game Consoles available for device evaluation and implementation sug- Digital Voice Recorders gestions. Please see Ordering Information on page 73 Digital Camcorders for complete details. Digital Cameras Smart Phones 2 DS773F1