TV Converter Box User's Manual

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1 EVM Overview

1.1 Features

User's Guide

SLAU189 – September 2006

ADS8364/65MEVM

This user's guide describes the characteristics, operation, and use of the

ADS8364/65MEVM 16-bit, parallel analog-to-digital converter evaluation module

(EVM). A complete circuit description, a schematic diagram, and bill of materials is

included.

Contents

1 EVM Overview ...................................................................................... 1

2 Introduction .......................................................................................... 2

3 Analog Interface .................................................................................... 2

4 Digital Interface ..................................................................................... 4

5 Power Supplies ..................................................................................... 6

6 EVM Operation ...................................................................................... 6

7 EVM Bill of Materials, Assembly Drawing, and Schematic .................................... 7

8 Related Documentation From Texas Instruments ............................................ 10

List of Figures

1 Channel A0 Input Circuit ........................................................................... 3

2 Channel A1 Input Circuit ........................................................................... 4

3 ADS8364/654MEVM Assembly Drawing ........................................................ 9

List of Tables

1 Typical Analog Input Buffer Circuit Values ...................................................... 3

2 Header/Socket Combinations at J5 .............................................................. 5

3 J1 Pinout and Functions ........................................................................... 6

4 JP1 Pinout ........................................................................................... 6

5 ADS8364/65MEVM Jumpers ...................................................................... 7

6 ADS8364/65MEVM Bill of Materials ............................................................. 7

• Full-featured evaluation board for the ADS8364 and ADS8365 250-kHz, 16-bit, 6-channel,

simultaneous-sampling, analog-to-digital converter

• Analog inputs can be configured as single-ended or differential

• Modular design allows direct connection to various DSP platforms through the 5-6K and HPA-MCU

Interface Boards

• Built-in reference

• High-speed parallel interface

SLAU189 – September 2006 ADS8364/65MEVM 1

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Summary of content (14 pages)

PAGE 1
User's Guide SLAU189 – September 2006 ADS8364/65MEVM This user's guide describes the characteristics, operation, and use of the ADS8364/65MEVM 16-bit, parallel analog-to-digital converter evaluation module (EVM). A complete circuit description, a schematic diagram, and bill of materials is included. 1 2 3 4 5 6 7 8 Contents EVM Overview ...................................................................................... 1 Introduction ....................................................................
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www.ti.com Introduction 2 Introduction The ADS8364 and ADS8365 are high-speed, low-power, 6-channel, 16-bit A/D converters that operate from independent +5-V Avdd and Dvdd supplies. Internal buffer circuits powered from 3.3-V to 5.5-V BVdd supplies allow for mixed logic level operation without additional level translation. The six input channels contain fully differential sample-and-hold circuits which are divided into three pairs (A, B, and C).
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www.ti.com Analog Interface NOTE: Components marked NI are NOT INSTALLED. Figure 1. Channel A0 Input Circuit This configuration allows single-ended signals of ±2.5 V (+5 Vpp) to be applied to either input of channel A0 (J2 pin 1 or 3 referenced to pin 2). The input also can be applied to connector J4 (not shown) pins 2 or 4, referenced to analog ground. 3.
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www.ti.com Digital Interface The output from the buffer stage in each case applies 0-5 V to the CHA0(+) input when the applied signal is connected to J2 pin 1 or J4 pin 2. The applied signal is directed to the CHA0(-) input when connected via J2 pin 3 or J4 pin 4. When operating the ADS836x with single-ended signals, it is important to keep the unused ADC input biased to +2.5 V.
PAGE 5
www.ti.com Digital Interface Jumpers W4 and W6 control the signals applied to A0, A1, A2, and CS. In the factory default mode, W6 is closed by means of a shunt jumper. The Ax and CS pins are controlled by the signals applied to J5 (top or bottom side). When used with either the 5-6K or HPA-MCU Interface Boards, these control signals are associated with the host processors address bus. By removing the shunt jumper located at W6, the A0, A1, and A2 pins are controlled by shunt jumpers placed on W4.
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www.ti.com Power Supplies Table 3. J1 Pinout and Functions 5 Pin Number Signal Description J1.1 NAP Controls power-down options on the ADS8365 (only) using the NAP input pin J1.3 ADD Controls read options, when HI, address information can be read from the chip J1.5 HOLD_C# Active-low signal HOLDC used to start a conversion on ADC channel pair C J1.7 HOLD_B# Active-low signal HOLDB used to start a conversion on ADC channel pair B J1.
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www.ti.com EVM Bill of Materials, Assembly Drawing, and Schematic The digital control signals can be applied directly to J1 and J5 (top or bottom side). The ADS8364/65MEVM can also be connected directly to the 5-6K Interface Board for use with a variety of C5000™ and C6000™ series DSP Starter Kits (DSK), or the HPA-MCU Interface Board for use with C2000™ Series DSPs and TMS470™ Series controllers.
PAGE 8
www.ti.com EVM Bill of Materials, Assembly Drawing, and Schematic Table 6. ADS8364/65MEVM Bill of Materials (continued) Designators 8 Description Manufacturer Mfg. Part Number D1 D2 Green LED Chicago Miniature CMD15-21VGC/TR8 J1 J3–J5(Bottom Side) 10 Pin, Dual Row, SMT Socket (20 Pos.) Samtec SSW-110-22-S-D-VS J1 J3–J5 (Top Side) 10 Pin, Dual Row, SMT Header (20 Pos.) Samtec TSM-110-01-T-D-V-P J2 3 Terminal Screw Connector On-Shore Tech.
PAGE 9
www.ti.com EVM Bill of Materials, Assembly Drawing, and Schematic 7.2 Assembly Drawing Figure 3 shows the top layer of the ADS8364/65MEVM and provides quick access to component designator found on the PWB. Complete Gerber files are available on request. Figure 3. ADS8364/654MEVM Assembly Drawing 7.3 Circuit Schematics The entire circuit schematic for the ADS8364/65MEVM appears on the following page.
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1 2 3 4 5 6 Revision History REV ECN Number Approved Note: Components marked "NI" C1 are NOT installed! W1 33pF TP7 R2 R4 4.99K 4.99K -Vin D 4 D Op Amp Bypass U1A +Vin J2 2 R3 1 C23 NI C22 0.01uF C21 NI OPA2132 C4 NI +Vin R1 3 C31 100pF R29 4.99K C26 100pF C42 1nF C43 1nF C44 1nF 33pF 4.99K C0+ 49.9 C29 100pF C19 -Vin R25 B0+ 49.9 Vref 4.99K W2 R8 R12 A0+ 49.9 NI 2 R14 1 3 8 C24 0.01uF A0In TP6 U1B 6 5 49.
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1 2 3 4 5 6 ADC Bypass J5 AVdd BVdd C48 0.1uF BVdd C47 0.1uF C46 0.1uF C40 0.1uF C39 0.1uF C38 0.1uF C37 0.1uF BGND 24 50 22 3 8 13 59 D 0.
PAGE 12
www.ti.com Related Documentation From Texas Instruments 8 Related Documentation From Texas Instruments 1. ADS8364, 250kHz, 16-Bit, 6-Channel Simultaneous Sampling Analog-to-Digital Converters data sheet (SBAS219) 2. ADS8365, 250kHz, 16-Bit, 6-Channel Simultaneous Sampling Analog-to-Digital Converter data sheet (SBAS362) 3. OPA2132, High-Speed FET-Input Operational Amplifiers data sheet (SBOS054) 4. INA159, Precision Gain of 0.2 Level Translation Difference Amplifier data sheet (SBOS333) 5.
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EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.