Texas Instruments Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP, Introduction

Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP

Falk Alicke and Perry Miller

ABSTRACT

In this application report we discuss the hardware and software interface of the TLV1562, 10-bit parallel-output analog-to-digital converter (ADC) to the TMS320C54x digital signal processor (DSP). The hardware interface board, or evaluation module (EVM) consists of the TLV1562 10-bit ADC, a THS5651 10-bit parallel output communication digital-to-analog converter (CommsDAC ) and a TLC5618A serial-outputdigital-to-analog converter (DAC).

Following the discussion of the ADC we explain the need for both the THS5651 CommsDAC and the TLC5618A serial DAC.

The application report concludes with several software application examples and recommendations for simplifying the software through modifications of the DSP hardware interface circuit.

1 Introduction

The analog-to-digital (A/D) interface can present a significant design problem because hardware and software must work together across the interface to produce a usable, complete design. This application report provides a design solution for the interface between the TLV1562 10-bit parallel-output analog-to-digital converter (ADC) and the TMS320C54x digital signal processor (DSP).

The report describes the hardware and software needed to interface the ’C54x DSP to the TLV1562 ADC, which is intended for applications, such as industrial control and signal intelligence in which large amounts of data must be processed quickly. The first sections describe the basic operation of the TLV1562. For additional information see the References section at the end of this report.

2 The Board

The TLV1562 evaluation module (EVM) is a four-layer printed circuit board (PCB) constructed from FR4 material. The PCB dimensions are 180 mm ⋅ 112 mm ⋅ 12 mm. Ribbon cables are used to interface the TLV1562EVM to the TMS320C54x DSK plus starter kit.

2.1TMS320C54x Starter Kit

The starter kit simplifies the task of interfacing to the ’C54x processor. It comes with an ADC for voice bandwidth, and GoDSP code explorer as the software tool. A 10-MHz oscillator provides the clock signal to allow 40-MHz internal DSP clock cycles generated by the internal DSP PLL. Therefore, the board provides 40 MIPS of processing power.

Ribbon cables are used to connect the DSP with the EVM. Detailed descriptions of all connections are given later in this report.

CommsDAC is a trademark of Texas Instruments.

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