Audio Precision PSIA-2722 Programmable Serial Interface Adapter available from TTi in the UK and Eire

Programmable Serial Interface Adapter

The Audio Precision Programmable Serial Interface Adapter (PSIA) facilitates the connection of chip-level devices, such as analog-to-digital converters, digital-to-analog converters and sample-rate converters to a System Two Cascade and Cascade Plus measurement instrument. Devices may have a variety of interface protocols: different logic families and voltage levels, clock rates, word orientations, and formats.

User interface
The PSIA accommodates a wide variety of parameters to allow connection to virtually any device. These parameters are set within the Cascade or Cascade Plus control software, APWIN, on easy-to-use soft Transmitter and Receiver panels. PSIA setups are saved as part of the Cascade or Cascade Plus test file, ensuring repeatable and consistent measurements.

Accommodates a broad range of logic families and formats

Accommodation of a broad range of logic families and formats
I²S switch and simplified I²S setup controls
Internal or external master clock, bit clock, and word clock
Channel (subframe) clock output
N*Fs clock output
Settings for inversion, bit-wide pulse, and edge sync
Intuitive clock settings by rate or factor
2, 4 or multiple channels are supported.
Voltage levels for 5 V and 3.3 V TTL; 1.8 V, 2.4 V, and 3.3 V CMOS. Front panel voltage indicators
Variable data word width
MSB or LSB first
Left justified, right justified, or padded
Data padding with "0", "1", or sign / LSB
Loop-Back mode to help with debugging. You can copy transmitter settings to the receiver with a single click for quick setup.

Convenient Test Development Features
The PSIA includes a Loop-Back mode to facilitate debugging. You can copy transmitter settings to the receiver with a single click for quick setup. The complete setup can be stored and recalled with APWIN tests. Simplified setup controls for I2S are also provided.

Package
The PSIA is housed in a slim rack-width package that will conveniently sit on top of the host Cascade Plus system. All logic lines are connected via front panel BNC connectors to ensure data integrity. A handy oscilloscope probe jack is provided for each BNC signal. As several of the data ports can be either in an input or output mode, LEDs are located above each BNC connector to indicate data direction.

Input / Output Impedance

SIGNAL	INPUT IMPEDANCE	OUTPUT IMPEDANCE	MAX V IN
Tx Master Clock	> 10 k	50	5.5 V
Tx NFs Clock	N/A	50	N/A
Tx Bit Clock	> 10 k	50	5.5 V
Tx Channel Clock	N/A	50	N/A
Tx Frame Clock	30 k	50	5.5 V
Tx Data	N/A	50	N/A
Rx Master Clock	30 k	50	5.5 V
Rx NFs Clock	N/A	50	N/A
Rx Bit Clock	> 10 k	50	5.5 V
Rx Channel Clock	N/A	50	N/A
Rx Frame Clock	30 k	50	5.5 V
Rx Data	30 k	N/A	5.5 V

Master clock in (external clock)	60 MHz
Master clock out	27.648 MHz (2700/Cascade instrument limit)
Bit clock in/out	25 MHz (using external master clock)
	13.824 MHz (using instrument master clock)
Frame clock in/out	216 kHz

Audio Precision PSIA-272 Serial Interface Adapter

available in the UK from TTi

Programmable Serial Interface Adapter PSIA-2722 - available from TTi in the UK and Eire