CSP1027 General Description
The Lucent CSP1027 is a high-precision linear voiceband D-S (delta-sigma) codec designed for cellular handset and modem applications. The device is fabricated in low-power CMOS technology and designed for low-voltage (3.0 V to 5.0 V) digital systems.
The CSP1027 is packaged in a 44-pin EIAJ quad flat pack (QFP) or a 48-pin EIAJ thin quad flat pack (TQFP). In the 48-pin TQFP, the CSP1027 occupies a total volume of 0.0784 cm3. The CSP1027 has a variety of significant programmable features not found in standard voice band codecs. The analog interface includes a microphone preamplifier with programmable gain settings, an output amplifier with gain programmable in 3 dB steps over a 45 dB range, and a regulated microphone power supply. An inactive mode allows a low-power standby state, and a mute function provides suppression of the analog output. On-chip antialiasing and anti-imaging filtering includes a selectable high-pass filter. The CSP1027 meets ITU-T G.712 voice band specifications.
The programmable features of the CSP1027 are set by writing four on-chip control registers through the serial I/O interface. The codec's digital input/output uses a linear 16-bit two's complement data format that is also transferred through the serial I/O interface. The CSP1027 interfaces easily to the 16-bit serial ports of digital signal processors and other devices. The serial interface supports the Lucent fixed-point DSP family serial multiprocessor mode. This allows up to eight compatible devices, including two CSP1027s, to interface to each other on a common 4-wire bus using a time-division-multiplexing scheme.
CSP1027 Maximum Ratings
Voltage Range on any Pin with Respect to Ground.............. 0.5 V to +6 V
Power Dissipation .............................................................................. 0.3 W
Ambient Temperature Range.........................................40 °C to +85 °C
Storage Temperature Range ..................................... 65 °C to +150 °C
CSP1027 Features
`D-S (delta-sigma) A/D and D/A converters with standard 16-bit serial I/O interface.
`On-chip filters meet ITU-T G.712 voice band frequency response and signal to distortion plus noise specifications. Suitable for IS-54, GSM, and JDC digital cellular applications.
`Low-profile package (<1.5 mm) 48-pin thin quad flat pack (TQFP) available or 44-pin EIAJ quad flat pack (QFP).
`Operates in systems with a 3.0 V to 5.0 V digital power supply and a 5.0 V analog supply.
`Low-power 0.9 m CMOS technology, fully static design, typical power of 68 mW when active and 0.05 mW in standby with a 3.3 V digital supply and a 5.0 V analog supply.
`A low-power inactive (standby) state without stopping clock or removing power supply.
`Sampling rates up to 24 kHz.
`On-chip programmable sampling clock generator allows input clock to be an integer multiple of 125 times the sampling rate or an integer multiple of the sampling rate.
`Programmable phase adjust of both codec sampling clock and baseband codec clock.
`Two on-chip clock dividers for generating the output clock for the baseband codec and the output clock for other processors.
`Regulated microphone power supply.
`Microphone preamplifier, with programmable input ranges of 0.16 Vp and 0.5 Vp.
`Output amplifier, with programmable gain settings,
`dB to 45 dB in 3 dB steps.
`High-pass filters selectable via control registers.
`Power-on reset pulse generator.
`Standard 16-bit serial I/O interface.
`Serial I/O multiprocessor mode compatible with the Lucent Technologies Microelectronics Group's DSP16A and DSP1610/1616/1617/1618 Digital Signal Processors.
CSP1027 Connection Diagram
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