PCM1800E
PCM1800E - 20-Bit 48 kSPS Stereo ADC | Texas Instruments
The Texas Instruments PCM1800E is a 20-bit stereo analog-to-digital converter (ADC) with single-ended analog inputs, a maximum sampling rate of 48 kSPS, a 4.5 V to 5.5 V supply range, and a 24-pin SSOP package. It converts two analog input channels into digital data and is intended for cost-sensitive consumer audio equipment. According to the Texas Instruments PCM1800 product page, the converter uses a delta-sigma modulator, 64-times oversampling, a digital decimation filter, and a serial interface supporting master and slave modes.
An ADC is a mixed-signal semiconductor that converts continuously varying analog voltages into numerical values suitable for digital processing. The PCM1800 belongs to the delta-sigma ADC family and the broader data-converter and signal-processing IC hierarchy. Its single-ended inputs simplify source connections when the signal source can be referenced adequately against the converter's analog ground. Digital audio equipment commonly uses this architecture to support CD-compatible 44.1 kSPS and 48 kSPS playback or recording rates.
Key features of the PCM1800E include dual 20-bit monolithic conversion, single-ended voltage inputs, 64-times oversampling, and four supported data formats. The decimation filter has a stated passband ripple of ±0.05 dB and stopband attenuation of -65 dB. The reported signal-to-noise ratio is 95 dB, making the device relevant to audio preamplifiers, consumer receivers, digital mixers, and other systems requiring stereo audio capture at 48 kSPS.
The delta-sigma architecture converts the analog signal through oversampling and digital filtering before producing the final serial output. PCM1800 documentation identifies both master and slave operating modes, allowing the converter either to generate the serial clock or synchronize it with an external audio processor. Four data formats provide design flexibility when connecting the ADC to codecs, digital audio processors, microcontrollers, or programmable logic. The serial interface and decimation filter therefore form the boundary between the analog audio inputs and the digital signal path.
Typical PCM1800E applications include stereo consumer audio capture, digital recording equipment, audio mixer inputs, consumer media systems, and digital signal processing front ends. In a typical signal chain, a stereo source is buffered, level-shifted into the ADC input range, sampled by the delta-sigma modulator, decimated, and transferred to a digital audio processor through the serial interface. The 48 kSPS rate supports professional audio-standard sampling rates but does not itself provide the analog front-end gain, anti-alias filtering, clock generation, or output audio processing required by a complete system.
A key design consideration is preserving signal integrity at the single-ended analog inputs and the digital serial interface. Input routing should minimize noise pickup, keep the analog and digital return paths controlled, and account for the converter's input voltage range. Clock and data traces require suitable timing margins, while bypass capacitors should be placed close to the supply pins. The SSOP-24 package is suitable for compact designs, but its lead pitch and exposed analog, digital, and supply connections demand careful layout and assembly.
This page consolidates the verified PCM1800 family specifications, source links, application guidance, and replacement-status analysis into one engineering-focused reference. It also separates published facts from unavailable details so designers can identify what must still be confirmed in the manufacturer datasheet before schematic release, PCB layout, or production qualification.
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