Description
The Lucent CSP1027 is a high-precision linear voiceband ∆-Σ (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.

FEATUREs
■ ∆-Σ (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 µm 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, 0 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.