ES1938

 * Single, high-performance, mixed-signal, 16-bit stereo VLSI chip
 * PCI parallel bus interface, revision 2.2
 * Full native DOS games compatibility, via three technologies: TDMA DDMA PC/PCI

 * High-quality ESFM music synthesizer
 * Dynamic range (SNR) over 80 dB
 
 * Integrated  Spatializer3D VBX stereo audio effects processor  provided by Desper Products, Inc., a subsidiary of Spatializer Audio Laboratories, Inc.

The ES1938 PCI AudioDrive^_®, solution implements a single-chip PCI audio solution, providing high-quality audio processing while maintaining full legacy DOS game compatibility. With a dynamic a range over 80 dB, the ES1938 complies with the Microsoft®, PC 98 / PC 99 specifications and meets WHQL audio requirements. The ES1938 forms a complete audio subsystem on a single chip for motherboard platforms.

The ES1938 incorporates a microcontroller,  ESFM^TM  music synthesizer, 16-bit stereo wave ADC and DAC, 16-bit stereo music DAC, MPU-401 UART mode serial port, dual game port, hardware master volume control, a serial port interface to external wavetable music synthesizer, DMA control logic with FIFO, and PCI bus interface logic. There are three stereo inputs
(typically, line-in, CD audio, and auxiliary line) and a mono microphone input.

The ES1938 provides a serial EEPROM interface for ease of programming the Subsystem ID and Subsystem Vendor ID.

The ES1938 integrates the ESS Technology field-proven hardware design for DOS game compatibility with hardware FM synthesis (ESFM synthesis) and three methods for legacy audio
control interface: PC/PCI, Distributed DMA, and Transparent DMA. Transparent DMA requires no sideband signals from PC core logic chipsets in addition to the standard PCI 2.2 bus. Transparent DMA (TDMA) is compatible with the Intel,Pentium,, Pentium II®, and Celeron(TM)chipsets, as well as standard PCI add-in cards.

The ES1938 can record, compress, and play back voice, sound, and music with built-in mixer controls. It supports stereo full-duplex operation for simultaneous record and playback. The ESFM synthesizer has extended capabilities within native mode operation providing superior sound and power-down capabilities.

The ES1938 also incorporates  Spatializer®, VBX^TM technology, provided by Desper Products, Inc., a subsidiary of Spatializer Audio Laboratories, Inc. This processor expands the stereo sound field emitted by two speakers to create a resonant 3D sound environment.

The ES1938 is compliant with Advanced Power Management (APM) 1.2, Advanced Configuration and Power Interface (ACPI) 1.0, and PCI Power Management Interface (PPMI) 1.0.

It is available in an industry-standard 100-pin low-profile quad flat pack (LQFP) package.