WM8753L

w Hi-Fi and Telephony Dual CODEC DESCRIPTION The WM8753L is a low power, high quality stereo CODEC with integrated Voice CODEC designed for portable digital telephony applications such as mobile phone, or headset with Hi-Fi playback capability. The device integrates dual interfaces to two differentially connected microphones, and includes drivers for speakers, headphone and earpiece. External component requirements are reduced as no separate microphone or headphone amplifiers are required, and Cap-less connections can be made to all loads. Advanced on-chip digital signal processing performs tone control, Bass Boost and automatic level control for the microphone or line input through the ADC. The two ADCs may be used to support Voice noise cancellation in a partnering DSP, or for stereo recording. The WM8753L Hi-Fi DAC can operate as a master or a slave, with various master clock frequencies including 12 or 24MHz for USB devices, 13MHz or 19.2MHz for cellular systems, or standard 256fs rates like 12.288MHz and 24.576MHz. Internal PLLs generate all required clocks for both Voice and Hi-Fi converters. If audio system clocks already exist, the PLLs may be committed to alternative uses. The WM8753L operates at a nominal supply voltage of 2V, although the digital core can operate at voltages down to 1.42V to save power, and the maximum for all supplies is 3.6 Volts. Different sections of the chip can also be powered down under software control. WM8753L FEATURES • • Hi-Fi DAC: interfaced over I2S type link Audio sample rates: 8, 11.025, 16, 22.05, 24, 32, 44.1, 48, 88.2, 96 • DAC SNR 98dB, THD -84dB (‘A’ weighted @ 48kHz) • ADC SNR 95dB, THD -82dB (‘A’ weighted @ 48kHz) • On-chip Headphone Driver with cap-less output option - 40mW output power on 16Ω / 3.3V - with 16Ω load: SNR 90dB, THD –75dB - with 10kΩ load: SNR 94dB, THD –90dB • On-chip speaker driver with 0.5W into 8R • Voice CODEC: interfaced over Voice interface • supports sample rates from 8ks/s to 48ks/s • ADC and DAC SNR 82dB, THD -74dB • Two Differential Microphone Interfaces - Dual ADCs support noise cancellation in external DSP - Programmable ALC / Noise Gate • Low-noise bias supplied for electret microphones Other Features • On-chip PLLs supporting 12, 13, 19.2MHz and other clocks • Cap-less connection options to headphones, earpiece, spkr. • Low power, low voltage - 1.8V to 3.6V (digital core: 1.42V to 3.6V) - power consumption 0.53fs -30 7/fs +/- 0.3dB -14dB 0 0.5fs +/-0.3 0.53fs f > 0.53fs -30 7/fs dB dB 0.414fs dB dB TYP MAX 0.414fs UNIT PARAMETER Voice ADC Filter Passband Passband Ripple Stopband Stopband Attenuation Group Delay Voice DAC Filter Passband Passband Ripple Stopband Stopband Attenuation Group Delay Table 75 Voice CODEC Digital Filter Characteristics PARAMETER High Pass Filter Corner Frequency TEST CONDITIONS -3dB -0.5dB -0.1dB ADC High Pass Filter (HPMODE[1:0] = 01) (256fs, fs=16kHz) High Pass Filter Corner Frequency -3dB -0.5dB -0.1dB ADC High Pass Filter (HPMODE[1:0] = 10) (256fs, fs=8kHz) High Pass Filter Corner Frequency -3dB -0.5dB -0.1dB ADC High Pass Filter (HPMODE[1:0] = 11) (256fs, fs=8kHz) High Pass Filter Corner Frequency -3dB -0.5dB -0.1dB Table 76 ADC Highpass Filter Characteristics 170 321 415 Hz 82 185 272 Hz 82 203 341 Hz MIN TYP 3.7 10.4 21.6 MAX UNIT Hz ADC High Pass Filter (HPMODE[1:0] = 00) (256fs, fs=48kHz) TERMINOLOGY 1. 2. Stop Band Attenuation (dB) – the degree to which the frequency spectrum is attenuated (outside audio band) Pass-band Ripple – any variation of the frequency response in the pass-band region w PP Rev 3.4 November 2005 80 WM8753L DAC FILTER RESPONSES 0.02 0 Pre-Production 0.01 -20 0 Response (dB) -40 Response (dB) 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.01 -0.02 -0.03 -0.04 -0.05 -60 -80 -100 -0.06 0 0.05 0.1 0.15 0.2 0.25 0.3 Frequency (Fs) 0.35 0.4 0.45 0.5 Figure 32 DAC Digital Filter Frequency Response – Type 0 0 Figure 33 DAC Digital Filter Ripple – Type 0 0.02 0.01 -20 0 Response (dB) -40 Response (dB) -0.01 -0.02 -0.03 -0.04 -60 -80 -0.05 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.06 0 0.05 0.1 0.15 0.2 0.25 0.3 Frequency (Fs) 0.35 0.4 0.45 0.5 Figure 34 DAC Digital Filter Frequency Response – Type 1 Figure 35 DAC Digital Filter Ripple – Type 1 0.02 0 0.01 -20 0 Response (dB) -40 Response (dB) -0.01 -0.02 -0.03 -0.04 -60 -80 -0.05 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.06 0 0.05 0.1 0.15 Frequency (Fs) 0.2 0.25 Figure 36 DAC Digital Filter Frequency Response – Type 2 Figure 37 DAC Digital Filter Ripple – Type 2 w PP Rev 3.4 November 2005 81 Pre-Production 0.25 0 WM8753L 0.2 -20 0.15 0.1 Response (dB) Response (dB) -40 0.05 0 -0.05 -0.1 -60 -80 -0.15 -0.2 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.25 0 0.05 0.1 0.15 Frequency (Fs) 0.2 0.25 Figure 38 DAC Digital Filter Frequency Response – Type 3 Figure 39 DAC Digital Filter Ripple – Type 3 ADC FILTER RESPONSES 0.04 0 0.03 -20 0.02 Response (dB) -40 Response (dB) 0.01 0 -0.01 -0.02 -60 -80 -0.03 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.04 0 0.05 0.1 0.15 0.2 0.25 0.3 Frequency (Fs) 0.35 0.4 0.45 0.5 Figure 40 ADC Digital Filter Frequency Response – Type 0 0 Figure 41 ADC Digital Filter Ripple – Type 0 0.02 0.01 -20 0 Response (dB) -40 Response (dB) -0.01 -0.02 -0.03 -0.04 -60 -80 -0.05 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.06 0 0.05 0.1 0.15 0.2 0.25 0.3 Frequency (Fs) 0.35 0.4 0.45 0.5 Figure 42 ADC Digital Filter Frequency Response – Type 1 Figure 43 ADC Digital Filter Ripple – Type 1 w PP Rev 3.4 November 2005 82 WM8753L 0.25 0 Pre-Production 0.2 -20 0.15 0.1 Response (dB) Response (dB) -40 0.05 0 -0.05 -0.1 -60 -80 -0.15 -0.2 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.25 0 0.05 0.1 0.15 Frequency (Fs) 0.2 0.25 Figure 44 ADC Digital Filter Frequency Response – Type 2 Figure 45 ADC Digital Filter Ripple – Type 2 0.25 0 0.2 0.15 -20 0.1 Response (dB) Response (dB) -40 0.05 0 -0.05 -0.1 -60 -80 -0.15 -0.2 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.25 0 0.05 0.1 0.15 Frequency (Fs) 0.2 0.25 Figure 46 ADC Digital Filter Frequency Response – Type 3 Figure 47 ADC Digital Filter Ripple – Type 3 w PP Rev 3.4 November 2005 83 Pre-Production WM8753L VOICE FILTER RESPONSES VOICE DAC FILTER RESPONSES 10 0 -10 -20 Response (dB) -30 -40 -50 -60 -70 -80 0 0.5 1 1.5 2 Frequency (Fs) 2.5 3 3.5 4 Response (dB) 2 0 -2 -4 -6 -8 -10 -12 -14 -16 0 0.1 0.2 0.3 0.4 0.5 Frequency (Fs) Figure 48 Voice DAC Digital Filter Frequency Response 0.4 0.3 0.2 Response (dB) 0.1 0 -0.1 -0.2 -0.3 -0.4 0 0.1 0.2 0.3 0.4 0.5 Freque ncy (Fs) Figure 49 Voice DAC Digital Filter Frequency Response Figure 50 Voice DAC Digital Filter Ripple VOICE ADC FILTER RESPONSES 10 0 -10 Response (dB) 2 0 -2 -4 -6 -8 -10 -12 -14 - 16 0 0.1 0.2 Frequency (Fs) 0.3 0.4 0.5 Response (dB) -20 -30 -40 -50 -60 -70 - 80 0 0.5 1 1.5 2 2.5 3 3.5 4 Frequency (Fs) Figure 51 Voice ADC Digital Filter Frequency Response Figure 52 Voice ADC Digital Filter Frequency Response 0.4 0.3 0.2 Response (dB) 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 - 0.6 0 0.1 0.2 Frequency (Fs) 0.3 0.4 0.5 Figure 53 Voice ADC Digital Filter Ripple w PP Rev 3.4 November 2005 84 WM8753L DE-EMPHASIS FILTER RESPONSES 0 0.4 0.3 Pre-Production -2 0.2 Response (dB) -4 Response (dB) 0.1 0 -0.1 -0.2 -6 -8 -0.3 -10 0 2000 4000 6000 8000 10000 Frequency (Fs) 12000 14000 16000 -0.4 0 2000 4000 6000 8000 10000 Frequency (Fs) 12000 14000 16000 Figure 54 De-emphasis Frequency Response (32kHz) 0 Figure 55 De-emphasis Error (32kHz) 0.4 0.3 -2 0.2 Response (dB) -4 Response (dB) 0.1 0 -0.1 -0.2 -6 -8 -0.3 -0.4 -10 0 5000 10000 Frequency (Fs) 15000 20000 0 5000 10000 Frequency (Fs) 15000 20000 Figure 56 De-emphasis Frequency Response (44.1kHz) 0 Figure 57 De-emphasis Error (44.1kHz) 0.4 0.3 -2 0.2 Response (dB) -4 Response (dB) 0.1 0 -0.1 -0.2 -6 -8 -0.3 -0.4 -10 0 5000 10000 Frequency (Fs) 15000 20000 0 5000 10000 Frequency (Fs) 15000 20000 Figure 58 De-emphasis Frequency Response (48kHz) Figure 59 De-emphasis Error (48kHz) w PP Rev 3.4 November 2005 85 Pre-Production WM8753L HIGHPASS FILTER The WM8753 has a selectable digital highpass filter in the ADC filter path to remove DC offsets. HPMODE[1:0] = 00 The filter response is characterised by the following polynomial: H(z) = 1 – z-1 1 – 0.9995z-1 5 0 Response (dB) -5 -10 -15 0.0000 0.0005 0.0010 Frequency (Fs) 0.0015 0.0020 Figure 60 ADC Highpass Filter Response, HPMODE[1:0] = 00 HPMODE[1:0] = 01 The filter response is characterised by the following polynomial: H(z) = 1 – z-1 1 – 0.96875z-1 5 0 -5 Response (dB) -10 -15 -20 -25 0.00 0.01 0.02 0.03 0.04 0.05 Fre quency (Fs) Figure 61 ADC Highpass Filter Response, HPMODE[1:0] = 01 w PP Rev 3.4 November 2005 86 WM8753L HPMODE[1:0] = 10 The filter response is characterised by the following polynomial: H(z) = 1 – z-1 1 – 0.9375z-1 5 Pre-Production 0 -5 Response (dB) -10 -15 -20 -25 -30 0.00 0.01 0.02 0.03 0.04 0.05 Frequency (Fs) Figure 62 ADC Highpass Filter Response, HPMODE[1:0] = 10 HPMODE[1:0] = 11 The filter response is characterised by the following polynomial: H(z) = 1 – z-1 1 – 0.875z-1 5 0 -5 Response (dB) -10 -15 -20 -25 -30 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 Freque ncy (Fs) Figure 63 ADC Highpass Filter Response, HPMODE[1:0] = 11 w PP Rev 3.4 November 2005 87 Pre-Production WM8753L APPLICATIONS INFORMATION RECOMMENDED EXTERNAL COMPONENTS Figure 64 Recommended External Components Diagram w PP Rev 3.4 November 2005 88 WM8753L MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS Pre-Production To minimise any pop or click noise when the system is powered up or down, the following procedures are recommended. POWER SUPPLIES The ideal way to apply power to the WM8753 is to all supplies at the same time. This is not always possible in many designs due to supplies being sourced from different voltage regulators or direct from batteries. In these situations, it is recommended that supplies are applied in the following order. 1. DCVDD, DBVDD and PVDD (if not at the same time, any order may be used) 2. AVDD 3. HPVDD and SPKRVDD (if not at the same time, any order may be used) Supplies may be removed in any order. However, it is recommended that HPVDD and SPKRVDD supplies be removed last. POWER UP Switch on power supplies. By default the WM8753L is in Standby Mode, the DAC is digitally muted and the Audio Interface and Outputs are all OFF Enable Vmid and VREF. Allow VREF to settle. The settling time depends on the value of the capacitor connected at VMID, and the size of the resistors selected using VMIDSEL (τ = RC). Enable DACs, etc. as required. Enable outputs as required. Set DACMU = 0 to un-mute the audio DACs. POWER DOWN (MINIMUM NOISE) Set DACMU = 1 to mute the audio DACs. Disable all Outputs. Disable VREF and VMIDSEL. Switch off the power supplies POWER DOWN (QUICKEST MIDRAIL DISCHARGE) Set DACMU = 1 to mute the audio DACs. Disable VREF and VMIDSEL. Switch off the power supplies. A choice of two power down sequences have been recommended. The first is completely noise free with the disadvantage that the mid-rail voltage can take some time to discharge due to the large amount of capacitance attached to the outputs. The second offers a quick discharge of the output capacitors but as the outputs have not been powered down it does allow for the small possibility that noise may be heard during power down. w PP Rev 3.4 November 2005 89 Pre-Production WM8753L PACKAGE DIAGRAM – 48-LEAD QFN FL: 48 PIN QFN PLASTIC PACKAGE 7 X 7 X 0.9 mm BODY, 0.50 mm LEAD PITCH D2 D2/2 37 48 L 36 1 INDEX AREA (D/2 X E/2) DM029.E SEE DETAIL 1 D EXPOSED GROUND 6 PADDLE E2/2 E2 SEE DETAIL 2 E 25 12 2X b 2X aaa C aaa C 24 e 13 BOTTOM VIEW ccc C TOP VIEW (A3) A 0.08 C C SEATING PLANE SIDE VIEW A1 DETAIL 1 R = 0.3MM DETAIL 2 1 DETAIL 3 W T (A3) H b Exposed lead G Datum Terminal tip e/2 EXPOSED GROUND PADDLE R e Half etch tie bar DETAIL 3 Symbols A A1 A3 b D D2 E E2 e G H L T W aaa bbb ccc REF Dimensions (mm) NOM MAX 0.90 1.00 0.05 0.02 0.20 REF 0.18 0.25 0.30 7.00 BSC 5.00 5.15 5.25 7.00 BSC 5.00 5.15 5.25 0.5 BSC 0.213 0.1 0.50 0.30 0.4 0.1 0.2 Tolerances of Form and Position 0.15 0.10 0.10 MIN 0.80 0 NOTE 1 JEDEC, MO-220, VARIATION VKKD-2 NOTES: 1. DIMENSION b APPLIED TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.15 mm AND 0.30 mm FROM TERMINAL TIP. 2. ALL DIMENSIONS ARE IN MILLIMETRES 3. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-002. 4. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS. 5. THIS DRAWING IS SUBJECT TO CHANGE WITHOUT NOTICE. 6. REFER TO APPLICATION NOTE WAN_0118 FOR FURTHER INFORMATION REGARDING PCB FOOTPRINTS AND QFN PACKAGE SOLDERING. w PP Rev 3.4 November 2005 90 WM8753L PACKAGE DIAGRAM - 52-BALL BGA B: 52 BALL BGA PLASTIC PACKAGE 5 X 5 X 0.9 mm BODY, 0.50 mm BALL PITCH 5 D 2 A A2 A B C D e E F G H J 2X e 0.10 Z 0.10 Z 6 E1 E Pre-Production DM034.A DETAIL 1 9 8 7 6 5 4 3 2 1 4 A1 CORNER DETAIL 2 D1 2X TOP VIEW BOTTOM VIEW SOLDER BALL bbb Z aaa Z 1 b A1 3 Z DETAIL 2 DETAIL 1 ccc Z X Y ddd Z Symbols A A1 A2 b D D1 E E1 e aaa bbb ccc ddd Dimensions (mm) MAX NOTE 1.27 0.27 0.21 1.00 0.90 0.30 0.35 5.00 BSC 4.00 BSC 5.00 BSC 4.00 BSC 6 0.50 BSC Tolerances of Form and Position MIN 0.95 0.15 0.80 0.25 NOM 1.11 0.80 0.10 0.15 0.05 NOTES: 1. PRIMARY DATUM -Z- AND SEATING PLANE ARE DEFINED BY THE SPHERICAL CROWNS OF THE SOLDER BALLS. 2. THIS DIMENSION INCLUDES STAND-OFF HEIGHT ‘A1’. 3. DIMENSION ‘b’ IS MEASURED AT THE MAXIMUM SOLDER BALL DIAMETER, PARALLEL TO PRIMARY DATUM -Z-. 4. A1 CORNER IS IDENTIFIED BY INK/LASER MARK ON TOP PACKAGE. 5. BILATERAL TOLERANCE ZONE IS APPLIED TO EACH SIDE OF THE PACKAGE BODY. 6. ‘e’ REPRESENTS THE BASIC SOLDER BALL GRID PITCH. 7. THIS DRAWING IS SUBJECT TO CHANGE WITHOUT NOTICE. w PP Rev 3.4 November 2005 91 Pre-Production WM8753L IMPORTANT NOTICE Wolfson Microelectronics plc (WM) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current. All products are sold subject to the WM terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. WM warrants performance of its products to the specifications applicable at the time of sale in accordance with WM’s standard warranty. Testing and other quality control techniques are utilised to the extent WM deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. In order to minimise risks associated with customer applications, adequate design and operating safeguards must be used by the customer to minimise inherent or procedural hazards. Wolfson products are not authorised for use as critical components in life support devices or systems without the express written approval of an officer of the company. Life support devices or systems are devices or systems that are intended for surgical implant into the body, or support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided, can be reasonably expected to result in a significant injury to the user. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. WM assumes no liability for applications assistance or customer product design. WM does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of WM covering or relating to any combination, machine, or process in which such products or services might be or are used. WM’s publication of information regarding any third party’s products or services does not constitute WM’s approval, license, warranty or endorsement thereof. Reproduction of information from the WM web site or datasheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations and notices. Representation or reproduction of this information with alteration voids all warranties provided for an associated WM product or service, is an unfair and deceptive business practice, and WM is not responsible nor liable for any such use. Resale of WM’s products or services with statements different from or beyond the parameters stated by WM for that product or service voids all express and any implied warranties for the associated WM product or service, is an unfair and deceptive business practice, and WM is not responsible nor liable for any such use. ADDRESS: Wolfson Microelectronics plc Westfield House 26 Westfield Road Edinburgh EH11 2QB United Kingdom Tel :: +44 (0)131 272 7000 Fax :: +44 (0)131 272 7001 Email :: sales@wolfsonmicro.com w PP Rev 3.4 November 2005 92