Datasheet

Host Interface
3-5
Setup Guide
3.8 Host Interface
The PGA2500EVM supports an external host interface to the PGA2500 serial
port utilizing connectors J5 through J7. A PC parallel port may be connected to
connector J5, using the straight through cable supplied with the EVM package.
The PC parallel port is used as the communications interface for the applica-
tions software provided with the EVM. Chapter 5 provides details for installing
and using the applications software.
The DATA_IN header (J6) may be used as an alternative host interface con-
nection, and is designed primarily for interfacing to microprocessors, digital
signal processors, or other host devices in either end equipment or hardware
development platforms.
The DATA_OUT header (J7) is designed primarily for cascading multiple
PGA2500EVM boards in a daisy-chain fashion. Daisy-chaining is described in
more detail in the PGA2500 datasheet.
3.9 Switch and Jumper Quick Reference
Table 3−1 and Table 3−2 provide a quick configuration reference of the switch
and jumper settings for the PGA2500EVM. Factory default settings are also
indicated.
Table 3−1.Switch Configuration Quick Reference
Switch Setting Function
DCEN LO (default)
HI
DC Servo Enabled
(1)(2)
DC Servo Disabled
0dB LO (default)
HI
Unity (odB) Gain Disabled, Gain Programmed Through Serial Port
(2)
Unity (0dB) Gain Enabled, Overrides Gain Set Through Serial Port
ZCEN LO
HI (default)
Zero-Crossing Detection Disabled
(2)
Zero-Crossing Detection Enabled
1) When DCEN
= LO, the DC bit in the serial control word may be used to disable and enable
the DC servo under software control.
2) A switch is set to LO when in the ON position (labeled ON C & K TDA04 on the switch itself).
A switch is set to HI when in the numbered position (labeled 1, 2, 3, or 4 on the switch itself).
Table 3−2.Jumper Configuration Quick Reference
Jumper Configuration
Jumper JMP1: Phantom Power
Phantom Power Disabled, Connected to GND (default)
Phantom Power Enabled, Connected to J2 Terminal Block
Pins 1 to 2
Open
Short
Pins 3 to 4
Short
Open
Jumper JMP3: V
COM
IN Input Connection
V
COM
IN (pin 25) Connected to GND (default)
V
COM
IN (pin 25) Connected to the VCOM Terminal of J4
Pins 1 to 2
Open
Short
Pins 3 to 4
Short
Open
Jumper J9: Register Read Back
Register Read Back Function Disabled
Register Read Back Function Enabled (default)
Pins 1 to 2
Open
Short
Jumpers JMP4 through JMP8, as well as JMP10, are shorted on the PCB layout. They may be cut
and replaced by jumpers if desired.
Jumper JMP2 is provided in order to add flexibility for the configurable input circuitry. This jumper
is left open by default.