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CX20470 Datasheet(PDF) 5 Page - Skyworks Solutions Inc. |
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CX20470 Datasheet(HTML) 5 Page - Skyworks Solutions Inc. |
5 / 18 page CDMA BAP CX20470 101106A Skyworks – Preliminary 5 August 24, 2000 Proprietary Information and Specifications are Subject to Change Audio CODEC Section The CODEC serves as an interface between a voice device and a digital processor system. The CODEC provides a bi-directional interface between voice/audio and a digital system processor. It receives audio signals from sources such as microphones, digitizes the signals, and outputs them to a host processing system. The CODEC receives digital signals from the digital processing system (MSM ASIC or equivalent), converts the signal to analog, and outputs the signal to a device such as an earpiece or a speaker. As shown in Figure 5, CODEC operations can be divided into four groups: transmit (ADC) channel, receive (DAC) channel, timing and control, and power control. CODEC Transmit Section. The transmit section is designed to interface directly with a microphone and/or an external audio source at the same time. The microphone input or external source signal can be selected as the audio input signal. The input signal is buffered and amplified with a provision to set the amplifier gain to accommodate a range of signal input levels. The amplified signal is then anti-aliased and bandpass filtered and applied to the input of a 14-bit linear A/D converter. The digital converted data is then clocked out as a serial data stream (PCMOUT) to the digital system processor. CODEC Receive Section. The receive section collects a frame of serial data on the PCMIN and converts it to the analog signal through a linear D/A converter. The analog converted signal is then lowpass filtered to provide out-of-band rejection and smoothing. The filtered signal is sent to the speaker or the line driver amplifier. Both amplifiers have a differential output with adjustable gain control. CODEC Configuration and Control Interface Section. CODEC operation mode and configuration control registers can be easily programmed directly from a digital system processor through an I2C -bus compatible or three-wire serial bus interface. The serial interface types are pin-selectable between 3-wire bus or I2C-bus interface. Electrical and Mechanical Specifications Signal pin assignments and functional pin descriptions are described in Table 1 (100-pin µBGA) and Table 2 (56-pin LGA). The absolute maximum ratings of the CX20470 are provided in Table 3. The recommended operating conditions are specified in Table 4. Electrical specifications are provided in Table 5. Tables 6 through 9 specify input and output signal levels and electrical characteristics. A system block diagram is provided in Figure 4 and an audio CODEC block diagram is presented in Figure 5. Package dimensions for the CX20470 are shown in Figure 6 (100-pin µBGA) and Figure 7 (56-pin LGA). Electrostatic Discharge (ESD) Sensitivity The CX20470 is a Class 1 device. The following ESD precautions are required: • Protective outer garments. • Handle device in ESD safeguarded work area. • Transport device in ESD shielded containers. • Monitor and test all ESD protection equipment. Treat the CX20470 BAP as extremely sensitive to ESD since ESD sensitivity has not yet been determined for this device. |
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