Product Introduction

DIO II – Low Phase Noise Digital Source / Capture Pattern bit example programming The DIO-II module is a multimode digital source and capture unit. In Low Speed Mode it provides a 20-bit parallel or 24-bit serial I/O capability running at speeds up to 50 MHz. In High Speed Mode, the DIO-II provides a 16-bit parallel I/O capability up to 200 MHz. In both Modes, the Clock is generated by a low jitter PLL source that is capable of generating clocks from 320 kHz up to 1 GHz. In low speed mode the maximum usable clock frequency is 100 MHz, in High Speed mode the maximum clock frequency via the backplane is 600 MHz and via the front clock 1 GHz. The DIO-II supports external clocking (in or out), external trigger and frequency synchronization with an external reference source. The DIO-II offers 8 Pattern Bits to the user for DUT synchronization and control. The remaining 8 Pattern Bits are used for control and synchronization of the analog source and capture modules through the ATX backplane. The flexible pattern bit structure enables the implementation of various serial protocols as SPI, I2C, I2S, etc. This ensures coherent mixed-signal measurements thereby improving the accuracy of your measurement without need for "post-process" windowing.

Key Features

• Multimode Digital Source/Capture module
• Very low jitter clock generation
• Up to 50 MHz data rate in low speed mode
• Up to 200 MHz data rate in high speed mode
• Up to 1 GHz clock rate via front clock out
• 20-bit parallel / 24-bit serial capture capability
• 128k x 16 pattern generator (low speed mode)
• Programmable clock delays (high sp. mode)
• Programmable IO levels
• Exclusively for ATX series hardware platform

Technical Specifications

Pattern Generator	100 MHz, 128kwords x 16-bits
Data I/O Pins	20-bit parallel / 24-bit serial
Data I/O Formats	parallel, byte-by-byte, serial
Source/Capture Depth	4M-words x 24-bits/8M-words x 16 bits
Internal clock frequency	320 kHz to 100 MHz
External clock frequency	DC to 100 MHz
Data source/capture rate	DC to 50 MHz
I/O Levels	VIL: 0.4 V (max), VIH: 1.2 V, 1.8 - 3.3 V

Front panel clocks

Clock output level (typical)	1.5 Vpp / 50 Ω
Clock output frequency	320 kHz - 1 GHz
Clock input Low Speed mode	DC - 100 MHz
Clock input High Speed mode	1 MHz - 400 MHz (ref. clock in)
Clock input threshold / imp.	0 V or 1 V (programmable) / 50 Ω