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User's Guide

SBOU082A–December 2009–Revised February 2010

PGA870EVM

This user's guide describes the characteristics, operation, and use of the PGA870EVM, an evaluation

fixture for the PGA870. The PGA870 is a wideband programmable gain amplifier (PGA) for high-speed

signal chain and data acquisition systems. This evaluation module (EVM) allows evaluation of all aspects

of the PGA870 device. Complete circuit descriptions, schematic diagrams, and bills of material are

included in this document. For more information about the PGA870, see the product data sheet (available

for download at www.ti.com).

Contents

1 Introduction .................................................................................................................. 2

2 EVM Overview ............................................................................................................... 2

3 PGA870EVM Control Panel Graphical User Interface (GUI) .......................................................... 5

4 GUI Software Installation and Use ........................................................................................ 5

5 Schematic and Parts List .................................................................................................. 8

List of Figures

1 Switch and Jumper Block Positions for Enabled Device, Gain = 20 dB, Unlatched Gain Mode ................. 3

2 Jumper Block Positions for Device Gain, Latching, and Disable to be Controlled through DB25

Connector (J8)............................................................................................................... 4

3 Switch and Jumper Block Positions for Device Gain (Unlatched Mode) Controlled through DB25

Connector and USB Interface Board ..................................................................................... 4

4 PGA870EVM Control Panel GUI After Installation, Before Successful Connection to PGA870EVM............ 5

5 PGA870EVM Control Panel GUI After Successful Connection to PGA870EVM................................... 6

6 Examples of Control Panel GUI Connected to the PGA870EVM .................................................... 7

7 PGA870EVM Schematic ................................................................................................... 8

8 Top Layer (Layer 1)......................................................................................................... 9

9 Ground Layer (Layer 2) .................................................................................................... 9

10 Power Layer (Layer 3)...................................................................................................... 9

11 Bottom Layer (Layer 4)..................................................................................................... 9

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SBOU082A–December 2009–Revised February 2010 PGA870EVM

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Summary of content (13 pages)

PAGE 1
User's Guide SBOU082A – December 2009 – Revised February 2010 PGA870EVM This user's guide describes the characteristics, operation, and use of the PGA870EVM, an evaluation fixture for the PGA870. The PGA870 is a wideband programmable gain amplifier (PGA) for high-speed signal chain and data acquisition systems. This evaluation module (EVM) allows evaluation of all aspects of the PGA870 device. Complete circuit descriptions, schematic diagrams, and bills of material are included in this document.
PAGE 2
Introduction 1 www.ti.com Introduction The PGA870 is a wideband PGA (available in a QFN-28 package) that has been optimized to provide high bandwidth, low distortion, and low noise, making it ideally suited as a 14-bit analog-to-digital converter (ADC) driver for wireless base station signal chain applications. The wide gain range of –11.5 dB to +20 dB can be adjusted in 0.5-dB gain steps through a 6-bit control word applied to the parallel interface.
PAGE 3
EVM Overview www.ti.com Table 1. PGA870EVM Switch Number and Corresponding Device Feature/Function (1) (continued) EVM Switch Device Function S9 B0 Description Gain control word LSB. A low/high signal will decrease/increase the gain by 0.5 dB Jumper EVM Connector JP7 J8, Pin 2 Examples of various EVM jumper and switch settings are shown in Figure 1 through Figure 3.
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EVM Overview www.ti.com Figure 2. Jumper Block Positions for Device Gain, Latching, and Disable to be Controlled through DB25 Connector (J8) Figure 3.
PAGE 5
PGA870EVM Control Panel Graphical User Interface (GUI) www.ti.com 3 PGA870EVM Control Panel Graphical User Interface (GUI) The gain of the device on the EVM may be controlled from a computer by using the PGA870 control panel GUI, the USB interface board in the EVM kit, and a USB cable. The GUI software installer (discussed in Section 4) is on the CD shipped with the EVM kit, and is also available for download through the PGA870 product folder on the TI web site.
PAGE 6
GUI Software Installation and Use www.ti.com Once the connections are configured, click on the Connect button on the upper left corner of the control panel GUI. If the control panel successfully connects to the PGA870EVM, then the button label changes from Connect to Disconnect as Figure 5 shows. If the control panel software cannot connect to the PGA870EVM, the Connect button does not change to Disconnect. No other error message is generated. Note: The button has changed from Connect to Disconnect.
PAGE 7
GUI Software Installation and Use www.ti.com Figure 6 shows examples of the GUI when it is connected to the PGA870EVM and used to select 20 dB of gain and 10 dB of gain, respectively. Figure 6.
PAGE 8
Schematic and Parts List 5 www.ti.com Schematic and Parts List + The EVM schematic is shown in Figure 7. Figure 7.
PAGE 9
Schematic and Parts List www.ti.com 5.1 PCB Layout The PGA870EVM PCB layers are shown in Figure 8 through Figure 11. Figure 8. Top Layer (Layer 1) Figure 9. Ground Layer (Layer 2) space Figure 10. Power Layer (Layer 3) Figure 11.
PAGE 10
Schematic and Parts List 5.2 www.ti.com Bill of Materials Table 2 lists the bill of materials (BOM) for the PGA870EVM. Table 2. PGA870EVM Bill of Materials Item RefDes Qty 1 FB1 1 Bead, ferrite, 3 A, 80 Ω 2 C5 1 Capacitor, 10 mF, tanatalum, 35 V, 10% 3 C1, C2, C13, C15, C16, C17, C18 7 Capacitor, 0.1 mF, ceramic, X5R, 16 V 4 C7, C8, C9, C10, C11, C12, C14, C19, C20, C21, C22, C23, C24, C25, C26, C27 16 Capacitor, 0.
PAGE 11
Revision History www.ti.com Revision History Changes from Original (December, 2009) to A Revision ............................................................................................... Page • • • Updated PGA870EVM kit contents list ................................................................................................ 2 Revised paragraphs that describe the process of connecting the PGA870EVM to the host computer .......................
PAGE 12
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.
PAGE 13
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.