Datasheet

PGA2500 Product Overview
1-5
Introduction
1.2 PGA2500EVM Features
The PGA2500EVM provides a convenient platform for evaluating the perfor-
mance and features of the PGA2500 product. Key EVM features include the
following:
- Accepts either XLR or TRS balanced input connections
- Configurable front-end circuit options for prototyping pads and filters
- XLR balanced output with flexible output loading options
- Buffered PC parallel and DATA_IN ports provide host interface connections
- DATA_OUT port allows daisy-chaining of multiple PGA2500EVM boards
- Register readback function supports host interface diagnostic capability
- LED indicators for GPOs and the over range output
- Common-mode voltage input (V
COM
IN) terminal
- Includes applications software which is compatible with most personal com-
puters that have a built-in parallel port and run the Microsoft Windows 9x,
2000, or XP operating systems
- Requires +5V and −5V analog supplies, as well as a +5V digital supply
1.3 PGA2500EVM Block Diagram
The main functions of the PGA2500EVM are shown in Figure 1−3. Configur-
able input and output circuitry provide convenient prototype options, while the
buffered host interface supports the supplied applications software and alter-
nate host configurations.
Figure 1−3. Functional Block Diagram for the PGA2500EVM
+
+
Microphone
Input
+48V
Preamplifier
Output
Phantom
Power
Protection Diodes
and
Configurable
Input Circuitry
Configurable
Output Circuitry
PGA2500
Buffer
SN74AHCT541
To GPO and Over Range
Indicators and Test Points
Dip Switch
Static Controls
DB25
PC
Parallel Port
HDR
DATA_IN
Port
HDR
DATA_OUT
Port