Overview
 The Envy24TM is a versatile PCI multi-channel I/O controller.
It allows up to 12x2 simultaneous input and output channels with the data source or destination beingeit her analog or digital.
Some of the typical applications for this part are computer based multi-track audio, multi-channel audio, PC-based data acquisition, waveform generation and computer telephony integration.
The Envy24 can be combined with professional grade I²S converters, S/PDIF transmitters/receivers or AC-link codecs, such as the VT1611ATM.
The controller integrates a very high resolution digital mixer allowing up to 20 channels of mixing.
This is aimed specifically for monitoring final outputs, making master copies and for budget conscious studios that may lack an individual out-board mixer.
The Envy24 supplies a master I²C interface providingconnection to an E²PROM to store and retrieve PCI Subsystem and Subsystem vendor IDs, specific board configurations and custom features identification.
This interface is available for controllingother devices as well.
For target markets where legacy audio is still important, the SoundBlaster Pro compatible hardware ensures hardware compatibility under DOS for DDMA (Distributed DMA) and non-DDMA systems.
The device also includes a Microsoft Win9x architecture based DirectSound hardware accelerator that interfaces to AC’97 via AC-link.
The separate path allows concurrent operation with the 24-bit professional multi-track audio section.
The Envy24 is a “Digital-Ready” audio device allowing acceleration in cooperation with the host and redirecting audio streams to other endpoints.
The Envy24 integrates two independent MPU-401 MIDI UARTs.
This features allows hooking up multiple external MIDI devices and dedicatingthe two paths for different purposes.
Additionally, a conventional standard Joystick port and timer is integrated.
Only R and C components are necessary to complete the circuit.
Also an 8-bit GPIO brings flexibility for multi-purpose use.
The Envy24 is a power miser device due to its aggressive power management scheme and hard-wired design architecture.
The device is ACPI compliant makingit suitable for platforms designed for “OnNow”.
Dependingon the samplingra tes that need to be supported by the target solution, one or two crystals are sufficient to operate the whole system.
Alternatively, a PLL Clock synthesizer chip can be used to generate the necessary frequencies.
The clock chip can be controlled by the GPIO pins for programmability.

Product Features
* PCI 2.1 I/F with bus masteringand burst modes
* 24-bit resolution audio format support
* Samplingrates up to 96kHz
* 8x2 I/O on AC-link or I²S, up to 4x2 converters
* Simultaneous I²S for S/PDIF I/O up to 96kHz
* 20 channels, 36-bit wide digital mixer
* Monitor and master copy functions
* Peak meters on all 20 professional multi-track streams
* Concurrent 16 streams DirectSoundTM accelerator
* Sample Rate Converter for DirectSound applications
* Two MPU-401 MIDI UART ports
* ACPI and PCI PMI support
* I²C subset I/F for E²PROM (configuration and ID storage) and peripherals control
* HW SoundBlaster® Pro legacy
* FM synthesis for DOS® legacy
* 64-voices SW Wavetable General MIDI Synthesizer for Windows95
* DirectInputTM compatible Joystick port
* 8-bit GPIO port
* Windows® 95/98, NT4.0 drivers
* 24.576, 16.9344 or 22.5792 MHz crystal operation
* 3.3V operatingsupply (5V tolerant I/O)
* 128-pin PQFP (14mm x 20mm body)

Product Applications
* PC-based multi-track audio
* Discrete multi-channel audio
* High-end PCI audio
* “Pro-sumer” audio
* General purpose multi-channel I/O
* Computer telephony
* PC-based data acquisition
* PC-based waveform generation
* PC-based instrumentation
* PC-based control and automation

VT1712-128PQFP

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