User's Guide SBAU178 – August 2010 AMC1204EVM This user's guide describes the characteristics, operation, and use of the AMC1204EVM. The AMC1204EVM is designed for prototyping and evaluation. A complete circuit description, schematic diagram, and bill of materials are included. The following related documents are available through the Texas Instruments web site at www.ti.com. 1 2 3 4 5 6 Device Literature Number AMC1204 SBAS512 AMC1210 SBAS372 Contents AMC1204EVM Overview ................................................................................................... 1.1 Features ............................................................................................................. 1.2 Introduction ......................................................................................................... Analog Interface ............................................................................................................. 2.1 Analog Inputs ....................................................................................................... Digital Interface .............................................................................................................. Power-Supplies .............................................................................................................. EVM Set-up and Operation ................................................................................................ 5.1 Isolated Power and Analog Inputs: J1 and J4 .................................................................. 5.2 Device Operation ................................................................................................... BOM, Schematic, and Layout ............................................................................................. 6.1 Schematic ........................................................................................................... 6.2 Printed Circuit Board Layout ...................................................................................... 6.3 Bill of Materials ..................................................................................................... 2 2 2 2 2 3 4 4 4 5 5 5 5 6 All trademarks are the property of their respective owners. SBAU178 – August 2010 AMC1204EVM Copyright © 2010, Texas Instruments Incorporated 1 AMC1204EVM Overview www.ti.com 1 AMC1204EVM Overview 1.1 Features AMC1204EVM: • Full-featured evaluation module for the AMC1204 single-channel, ΔΣ modulator • 9-pin sub-D connector for interfacing to the AMC1210 digital filter evaluation module • Screw terminals for easy access to analog inputs 1.2 Introduction The AMC1204 is a 1-bit modulator with an output buffer separated from the input interface circuitry by a silicon dioxide (SiO2) isolation barrier. The isolation barrier provides galvanic isolation of up to 4000 VPEAK. When used in combination with the AMC1210 or other digital filter, the AMC1204 can be used to achieve 16-bit analog-to-digital (A/D) conversion with no missing codes. For use in high-resolution measurement applications, an effective accuracy of 14 bits can be obtained with a digital filter bandwidth of 20 kHz at a modulator rate of 10 MHz. Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with the AMC1204EVM. 2 Analog Interface The analog input to the AMC1204 is routed from a two-wire screw terminal screw at J4. This screw terminal gives the user access to the inverting and noninverting inputs of the AMC1204. 2.1 Analog Inputs The analog input to the AMC1204EVM board consists of simple R/C filter circuits. The input circuit for the AMC1204 is shown in Figure 1. R1 IN+ 12 R2 C3 330pF IN- 12 J4 C4 10pF C5 10pF 2 1 ISOGND Figure 1. AMC1204EVM Schematic: Analog Input Section 2 AMC1204EVM SBAU178 – August 2010 Copyright © 2010, Texas Instruments Incorporated Digital Interface www.ti.com 3 Digital Interface The AMC1204EVM is designed for use with digital filters such as the AMC1210. The output and power for the AMC1204 are routed to a 9-pin, female D-type connector. Both the analog and digital power for the AMC1204, as well as the modulator data and clock outputs from the device under test, are routed to J2, as Figure 2 illustrates. VDD2 J3 1 VDD2 VDD2 2 3 4 C1 0.1mF 11 16 J2 4 9 5 W1 3 9 1 GND1 2 7 3 8 1 GND2 13 2 DATA 1 6 3 CLKIN 14 2 VDD2 C2 4.7mF W2 Figure 2. Power and Digital Outputs Connector J3 and jumpers W1 and W2 can be used to connect up to two AMC1204EVMs together, providing power, CLKIN, and DATA signals to the AMC1210 filter chip using a single 9-pin, female, D-type connector. SBAU178 – August 2010 AMC1204EVM Copyright © 2010, Texas Instruments Incorporated 3 Power-Supplies 4 www.ti.com Power-Supplies J2 provides access to the +5 VA for the VDD2 supply. All power to the board should be sourced from a well-regulated, linear supply that has current limiting capabilities. Power is to be applied through J2. Table 1 describes the pinout for J2. Table 1. J2: Power Supply and Digital Outputs Signal Pin Number Signal Ground 1 2 Not used 4.5 to 5.5 VDD2 supply 3 4 Not used Ground 5 6 Optional CLKIN output CLKIN default 7 8 DATA default Optional DATA output 9 For standalone operation, power sources can also be applied via a mating connector to J2, and the digital output data stream can be wired directly to an FPGA or other digital filter module for further processing. Refer to Figure 2 or the schematic appended to the end of this document for additional details. 5 EVM Set-up and Operation This section describes the general operation of the AMC1204EVM. 5.1 Isolated Power and Analog Inputs: J1 and J4 The isolated power input to the AMC1204EVM printed circuit board (PCB) can be applied directly to J1, pins 1 and 2. Table 2 lists the details of J1. Table 2. J1: Isolated Power Pin Number Signal J1.1 ISOGND J1.2 5 VISO Description Connection to the AMC1204 GND1 pin Connection to the AMC1204 VDD1 terminal The analog input to the AMC1204EVM PCB can be applied directly to J4 pins 1 and 2. Table 3 lists the details of J4. CAUTION Carefully review the AMC1204 product data sheet for the limitations of the analog input range, and ensure that the appropriate analog/digital voltages are applied before connecting any analog input to the EVM. Table 3. J4: Analog Inputs 4 Pin Number Signal J4.1 CHA+ Noninverting analog input to the AMC1204 Description J4.2 CHA– Inverting input to the AMC1204 AMC1204EVM SBAU178 – August 2010 Copyright © 2010, Texas Instruments Incorporated BOM, Schematic, and Layout www.ti.com 5.2 Device Operation Once the analog and digital power sources are applied to the AMC1204EVM, the digital outputs become active upon the application of an external modulator clock source. The internal reference of the AMC1204 is used as the conversion reference. Additionally, an analog input signal may be applied directly at screw terminal J1. See Figure 1 and Table 3 for more details. The analog input range, (VIN+) – (VIN–), is ±320 mV. As the input voltage approaches the maximum input level of +320mV, the 1s density of the modulator output approaches 92%. Likewise, when the input voltage approaches the lower limit of –320 mV, the 1s density is approximately 8%. 6 BOM, Schematic, and Layout This section contains the complete bill of materials, schematic diagram, and PCB layout for the AMC1204EVM. NOTE: Board layouts are not to scale. These are intended to show how the board is laid out; they are not intended to be used for manufacturing AMC1204EVM PCBs. 6.1 Schematic The AMC1204EVM schematic is appended to this document. 6.2 Printed Circuit Board Layout Figure 3. AMC1204EVM Silk Screen Drawing SBAU178 – August 2010 AMC1204EVM Copyright © 2010, Texas Instruments Incorporated 5 BOM, Schematic, and Layout 6.3 www.ti.com Bill of Materials Table 4. AMC1204EVM Bill of Materials Reference Designator Manufacturer Mfr Part Number Capacitor, ceramic 0.10 mF 50 V X7R 10% 0603 TDK C1608X7R1H104K C2, C7 Capacitor, ceramic 4.7 mF 25 V X5R 0805 TDK C2012X5R1E475K Capacitor, ceramic 330 pF 50 V C0G 5% 0603 TDK C1608C0G1H331J Capacitor, ceramic 10 pF 50 V C0G 0603 TDK C1608C0G1H100D C3 C4, C5 D1 J1, J4 Not installed — — Terminal block 3.5 mm 2-pos PCB On Shore ED555/2DS J2 Connector, DB-9 female solder cup tin Norcomp 172-009-202R001 J3 4-pin, single row header Samtec TSW-104-07-L-S R1, R2 Resistor, 12.0 Ω 1/10 W 1% 0603 SMD Yageo RC0603FR-0712RL R3 Resistor, 0..0 Ω 1/10 W 5% 0603 SMD Yageo RC0603JR-070RL W1, W2 Not installed, solder short pins 1 and 2 — — IC Delta-Sigma Mod 1bit 8-SOP TI AMC1204DW U1 6 Description C1, C6 AMC1204EVM SBAU178 – August 2010 Copyright © 2010, Texas Instruments Incorporated 1 2 3 4 REVISION HISTORY REV ENGINEERING CHANGE NUMBER APPROVED D D VDD1 5Viso J1 VDD2 R3 2 1 OST_ED-1514 J3 0 C7 4.7uF 1 2 3 4 D1 5.1V GND VDD2 HEADER-4 GND C2 4.7uF 5Viso C C6 1 6 2 7 3 8 4 9 5 VDD2 U1 C1 0.1uF 1 GND J4 12 OST_ED-1514 2 C3 330pF 2 1 3 R2 4 12 VDD2 IN+ CLKIN IN- DATA GND1 GND2 GND1 GND1 14 13 0.1uF J2 RS232 11 16 9 1 2 3 8 VDD1 1 2 3 R1 C AMC1204DW W1 2MM-3 GND C4 10pF W2 2MM-3 C5 10pF GND B B ti Precision Analog HIGH-PERFORMANCE ANALOG DIVISION SEMICONDUCTOR GROUP A 12500 TI Blvd, Dallas, TX 75243 ENGINEER Tom Hendrick DRAWN BY Tom Hendrick DOCUMENT CONTROL NO.TBD SHEET 1 1 2 3 OF 1 TITLE AMC1204EVM SIZE A REV A DATE 05AUG10 FILE C:\Userdata\EVMS\AMC1204\AMC1204.ddb - Documents\SCH\AMC1204 4 A 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. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives. Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive. TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/or safety programs, please contact the TI application engineer or visit www.ti.com/esh. No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which such TI products or services might be or are used. FCC Warning 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. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference. EVM Warnings and Restrictions It is important to operate this EVM within the input voltage range of 0V to 5V and the output voltage range of 0V to 5V. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power. Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures greater than +30°C. The EVM is designed to operate properly with certain components above +30°C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. 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