TLV5590

The TLV5590 analog-to-digital converter is a system level solution to interface a 4-level baseband audio signal to a digital decoder. The TLV5590 is a direct interface to the TLV5591BVF† FLEX decoder. Designed primarily for pager applications, the TLV5590 incorporates signal conditioning, both peak and valley detection along with analog-to-digital conversion. A selectable third-order Butterworth filter with cutoff frequencies of 1 kHz and 2 kHz is included. The peak and valley detectors are implemented with a unique design that does not require external capacitors. Two 8-bit digital-to-analog converters (DACs) are used in a feedback loop to automatically adjust to the peak and valley levels. The DAC outputs are used to set V_ref+ and V_ref for the 2-bit analog-to-digital converter (ADC). Modes of operation include fast track, slow track, hold, and standby. The standby mode maximizes battery life. The TLV5590 operates on a single supply down to 2.7 V.