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| resources:eval:ad9645-125ebz_ad9635-125ebz [29 Aug 2014 02:28] – minor clean-up Doug Ito | resources:eval:ad9645-125ebz_ad9635-125ebz [31 Jan 2015 01:44] – Added AD9655 part# Doug Ito |
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| ====== EVALUATING THE AD9645/AD9635 ANALOG-TO-DIGITAL CONVERTERS ====== | ====== EVALUATING THE AD9655/AD9645/AD9635 ANALOG-TO-DIGITAL CONVERTERS ====== |
| ===== Preface ===== | ===== Preface ===== |
| This user guide describes the [[adi>AD9645|AD9645]] and [[adi>AD9635|AD9635]] evaluation boards, [[adi>AD9645|AD9645-125EBZ]] and [[adi>AD9635|AD9635-125EBZ]], which provide all of the support circuitry required to operate these parts in their various modes and configurations. The application software used to interface with the devices is also described. | This user guide describes the [[adi>AD9655|AD9655]], [[adi>AD9645|AD9645]] and [[adi>AD9635|AD9635]] evaluation boards, [[adi>AD9655|AD9655-125EBZ]], [[adi>AD9645|AD9645-125EBZ]] and [[adi>AD9635|AD9635-125EBZ]], which provide all of the support circuitry required to operate these parts in their various modes and configurations. The application software used to interface with the devices is also described. |
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| The [[adi>AD9645|AD9645]] and [[adi>AD9635|AD9635]] data sheets provide additional information and should be consulted when using the evaluation board. All documents and software tools are available at [[adi>hsadcevalboard|www.analog.com/hsadcevalboard]]. For additional information or questions, send an email to highspeed.converters@analog.com. | The [[adi>AD9655|AD9655]], [[adi>AD9645|AD9645]] and [[adi>AD9635|AD9635]] data sheets provide additional information and should be consulted when using the evaluation board. All documents and software tools are available at [[adi>hsadcevalboard|www.analog.com/hsadcevalboard]]. For additional information or questions, send an email to highspeed.converters@analog.com. |
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| ===== Typical Measurement Setup ===== | ===== Typical Measurement Setup ===== |
| {{ :resources:eval:ad9645_125ebz_typical_setup.jpg?nolink&600 |}} | {{ :resources:eval:ad9645_125ebz_typical_setup.jpg?nolink&600 |}} |
| <WRAP centeralign>//Figure 1. Evaluation Board Connection—[[adi>AD9645|AD9645-125EBZ]] or [[adi>AD9635|AD9635-125EBZ]] (on Left) and [[adi>hsadcevalboard|HSC-ADC-EVALCZ]] (on Right)//</WRAP> | <WRAP centeralign>//Figure 1. Evaluation Board Connection—[[adi>AD9655|AD9655-125EBZ]], [[adi>AD9645|AD9645-125EBZ]] or [[adi>AD9635|AD9635-125EBZ]] (on Left) and [[adi>hsadcevalboard|HSC-ADC-EVALCZ]] (on Right)//</WRAP> |
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| ===== Features ===== | ===== Features ===== |
| * Full featured evaluation board for the [[adi>AD9645|AD9645]]/[[adi>AD9635|AD9635]] | * Full featured evaluation board for the [[adi>AD9655|AD9655]]/[[adi>AD9645|AD9645]]/[[adi>AD9635|AD9635]] |
| * SPI interface for setup and control | * SPI interface for setup and control |
| * External, on-board oscillator, or [[adi>ad9517|AD9517]] clocking option | * External, on-board oscillator, or [[adi>ad9517|AD9517]] clocking option |
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| ===== Helpful Documents ===== | ===== Helpful Documents ===== |
| * [[adi>AD9645|AD9645]] or [[adi>AD9635|AD9635]] data sheet | * [[adi>AD9655|AD9655]], [[adi>AD9645|AD9645]] or [[adi>AD9635|AD9635]] data sheet |
| * High speed ADC FIFO evaluation kit ([[adi>hsadcevalboard|HSC-ADC-EVALCZ]]) | * High speed ADC FIFO evaluation kit ([[adi>hsadcevalboard|HSC-ADC-EVALCZ]]) |
| * [[adi>an-905|AN-905 Application Note]], //VisualAnalog Converter Evaluation Tool Version 1.0 User Manual// | * [[adi>an-905|AN-905 Application Note]], //VisualAnalog Converter Evaluation Tool Version 1.0 User Manual// |
| * PC running Windows® | * PC running Windows® |
| * USB 2.0 port | * USB 2.0 port |
| * [[adi>AD9645|AD9645-125EBZ]] or [[adi>AD9635|AD9635-125EBZ]] board | * [[adi>AD9655|AD9655-125EBZ]], [[adi>AD9645|AD9645-125EBZ]] or [[adi>AD9635|AD9635-125EBZ]] board |
| * [[adi>hsadcevalboard|HSC-ADC-EVALCZ]] FPGA-based data capture kit | * [[adi>hsadcevalboard|HSC-ADC-EVALCZ]] FPGA-based data capture kit |
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| ===== Getting Started ===== | ===== Getting Started ===== |
| This section provides quick start procedures for using the [[adi>AD9645|AD9645-125EBZ]] or [[adi>AD9635|AD9635-125EBZ]] board. Both the default and optional settings are described. \\ | This section provides quick start procedures for using the [[adi>AD9655|AD9655-125EBZ]], [[adi>AD9645|AD9645-125EBZ]] or [[adi>AD9635|AD9635-125EBZ]] board. Both the default and optional settings are described. \\ |
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| ==== Configuring the Board ==== | ==== Configuring the Board ==== |
| Before using the software for testing, configure the evaluation board as follows: | Before using the software for testing, configure the evaluation board as follows: |
| - Connect the evaluation board to the data capture board, as shown in Figure 1. | - Connect the evaluation board to the data capture board, as shown in Figure 1. |
| - Connect one 6V, 2.5A switching power supply (such as the CUI, Inc., EPS060250UH-PHP-SZ that is supplied) to the [[adi>AD9645|AD9645-125EBZ]] or [[adi>AD9635|AD9635-125EBZ]]. | - Connect one 6V, 2.5A switching power supply (such as the CUI, Inc., EPS060250UH-PHP-SZ that is supplied) to the [[adi>AD9655|AD9655-125EBZ]], [[adi>AD9645|AD9645-125EBZ]] or [[adi>AD9635|AD9635-125EBZ]]. |
| - Connect one 6V, 2.5A switching power supply (such as the supplied CUI EPS060250UH-PHP-SZ) to the [[adi>hsadcevalboard|HSC-ADC-EVALCZ]] board. | - Connect one 6V, 2.5A switching power supply (such as the supplied CUI EPS060250UH-PHP-SZ) to the [[adi>hsadcevalboard|HSC-ADC-EVALCZ]] board. |
| - Connect the [[adi>hsadcevalboard|HSC-ADC-EVALCZ]] board (J6) to the PC using a USB cable. | - Connect the [[adi>hsadcevalboard|HSC-ADC-EVALCZ]] board (J6) to the PC using a USB cable. |
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| ===== Evaluation Board Hardware ===== | ===== Evaluation Board Hardware ===== |
| The evaluation board provides the support circuitry required to operate the [[adi>AD9645|AD9645]] and [[adi>AD9635|AD9635]] in their various modes and configurations. Figure 1 shows the typical bench characterization setup used to evaluate AC performance. It is critical that the signal sources used for the analog input and clock have very low phase noise (<1 ps rms jitter) to realize the optimum performance of the signal chain. Proper filtering of the analog input signal to remove harmonics and lower the integrated or broadband noise at the input is necessary to achieve the specified noise performance.\\ | The evaluation board provides the support circuitry required to operate the [[adi>AD9655|AD9655]], [[adi>AD9645|AD9645]] and [[adi>AD9635|AD9635]] in their various modes and configurations. Figure 1 shows the typical bench characterization setup used to evaluate AC performance. It is critical that the signal sources used for the analog input and clock have very low phase noise (<1 ps rms jitter) to realize the optimum performance of the signal chain. Proper filtering of the analog input signal to remove harmonics and lower the integrated or broadband noise at the input is necessary to achieve the specified noise performance.\\ |
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| See the [[http://wiki.analog.com/resources/eval/ad9645-125ebz_ad9635-125ebz#getting_started|Getting Started]] section to get started, and visit [[adi>ug-448_designsupport|UG-448 Design Support]] for the complete schematics and layout diagrams. These diagrams demonstrate the routing and grounding techniques that should be applied at the system level when designing application boards using these converters.\\ | See the [[http://wiki.analog.com/resources/eval/ad9645-125ebz_ad9635-125ebz#getting_started|Getting Started]] section to get started, and visit [[adi>ug-448_designsupport|UG-448 Design Support]] for the complete schematics and layout diagrams. These diagrams demonstrate the routing and grounding techniques that should be applied at the system level when designing application boards using these converters.\\ |
| {{ :resources:eval:ad9645_125ebz_default_jumpers.png?nolink&500 |}} | {{ :resources:eval:ad9645_125ebz_default_jumpers.png?nolink&500 |}} |
| <WRAP centeralign> | <WRAP centeralign> |
| //Figure 2. Default Jumper Connections for [[adi>AD9645|AD9645-125EBZ]]/[[adi>AD9635|AD9635-125EBZ]] Board// | //Figure 2. Default Jumper Connections for [[adi>AD9655|AD9655-125EBZ]]/[[adi>AD9645|AD9645-125EBZ]]/[[adi>AD9635|AD9635-125EBZ]] Board// |
| </WRAP> \\ | </WRAP> \\ |
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| ===== Evaluation Board Circuitry ===== | ===== Evaluation Board Circuitry ===== |
| This section explains the default and optional settings or modes allowed on the [[adi>AD9645|AD9645-125EBZ]] and the [[adi>AD9635|AD9635-125EBZ]] boards.\\ | This section explains the default and optional settings or modes allowed on the [[adi>AD9655|AD9655-125EBZ]], [[adi>AD9645|AD9645-125EBZ]] and the [[adi>AD9635|AD9635-125EBZ]] boards.\\ |
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| ==== Power ==== | ==== Power ==== |
| \\ | \\ |
| ==== Clock ==== | ==== Clock ==== |
| The default clock input circuit is derived from a simple transformer-coupled circuit using a high bandwidth 1:1 impedance ratio transformer (T603) that adds a low amount of jitter to the clock path. The clock input is 50 Ω terminated and ac-coupled to handle single-ended sinusoidal inputs. The transformer converts the single-ended input to a differential signal that is clipped by CR601 before entering the ADC clock inputs. The [[adi>AD9645|AD9645]] and [[adi>AD9635|AD9635]] ADCs are equipped with an internal 8:1 clock divider to facilitate usage with higher frequency clocks. When using the internal divider and a higher input clock frequency, remove CR601 to preserve the slew rate of the clock signal.\\ | The default clock input circuit is derived from a simple transformer-coupled circuit using a high bandwidth 1:1 impedance ratio transformer (T603) that adds a low amount of jitter to the clock path. The clock input is 50 Ω terminated and ac-coupled to handle single-ended sinusoidal inputs. The transformer converts the single-ended input to a differential signal that is clipped by CR601 before entering the ADC clock inputs. The [[adi>AD9655|AD9655]], [[adi>AD9645|AD9645]] and [[adi>AD9635|AD9635]] ADCs are equipped with an internal 8:1 clock divider to facilitate usage with higher frequency clocks. When using the internal divider and a higher input clock frequency, remove CR601 to preserve the slew rate of the clock signal.\\ |
| \\ | \\ |
| The [[adi>AD9645|AD9645-125EBZ]] and [[adi>AD9635|AD9635-125EBZ]] boards are set up to be clocked through the transformer-coupled input network from the crystal oscillator, Y602. If a different clock source is desired, remove C610 (optional) and Jumper P601 to disable the oscillator from running and connect the external clock source to the SMA connector, J602 (labeled CLK+).\\ | The [[adi>AD9655|AD9655-125EBZ]], [[adi>AD9645|AD9645-125EBZ]] and [[adi>AD9635|AD9635-125EBZ]] boards are set up to be clocked through the transformer-coupled input network from the crystal oscillator, Y602. If a different clock source is desired, remove C610 (optional) and Jumper P601 to disable the oscillator from running and connect the external clock source to the SMA connector, J602 (labeled CLK+).\\ |
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| ===== Modes of Operation ===== | ===== Modes of Operation ===== |
| ==== Standalone (PIN) Mode ==== | ==== Standalone (PIN) Mode ==== |
| The [[adi>AD9645|AD9645]]/[[adi>AD9635|AD9635]] ADCs can operate in pin mode if there is no need to program and change the default modes of operation via the SPI. For applications that do not require SPI mode operation, the CSB pin is tied to DRVDD by removing the J301 jumper that connects Pin 6 to Pin 9. In this configuration the SDIO/PDWN pin controls the power-down function, and the SCLK/DFS pin controls the digital output format. | The [[adi>AD9655|AD9655]]/[[adi>AD9645|AD9645]]/[[adi>AD9635|AD9635]] ADCs can operate in pin mode if there is no need to program and change the default modes of operation via the SPI. For applications that do not require SPI mode operation, the CSB pin is tied to DRVDD by removing the J301 jumper that connects Pin 6 to Pin 9. In this configuration the SDIO/PDWN pin controls the power-down function, and the SCLK/DFS pin controls the digital output format. |
| Table 2 and Table 3 specify the settings for pin mode operation. | Table 2 and Table 3 specify the settings for pin mode operation. |
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| |DRVDD |Twos Complement | | |DRVDD |Twos Complement | |
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| Additional information on the Standalone (PIN) Mode is provided in the [[adi>AD9645|AD9645]] and [[adi>AD9635|AD9635]] data sheets. | Additional information on the Standalone (PIN) Mode is provided in the [[adi>AD9655|AD9655]], [[adi>AD9645|AD9645]] and [[adi>AD9635|AD9635]] data sheets. |
| ==== Default Mode ==== | ==== Default Mode ==== |
| To operate the device under test (DUT) using the SPI, follow the jumper settings for J301 as shown in Table 1. | To operate the device under test (DUT) using the SPI, follow the jumper settings for J301 as shown in Table 1. |
| Lack of SPI communication will cause difficulty in configuring the ADC. | Lack of SPI communication will cause difficulty in configuring the ADC. |
| * Go to the **Global** tab of the **SPIController** window and push the **Read** button in the **GENERIC READ/WRITE** window. This will read the contents of ADC register 0x00. If SPI communication is working properly and the ADC is powered up, the value 0x18 hexadecimal will appear. If the contents show 0x00, the ADC is not powered up or SPI communication is not working. | * Go to the **Global** tab of the **SPIController** window and push the **Read** button in the **GENERIC READ/WRITE** window. This will read the contents of ADC register 0x00. If SPI communication is working properly and the ADC is powered up, the value 0x18 hexadecimal will appear. If the contents show 0x00, the ADC is not powered up or SPI communication is not working. |
| * Check that there is correct power to the [[adi>AD9645|AD9645-125EBZ]] or [[adi>AD9635|AD9635-125EBZ]] board, and to the [[adi>hsadcevalboard|HSC-ADC-EVALCZ]]. | * Check that there is correct power to the [[adi>AD9655|AD9655-125EBZ]], [[adi>AD9645|AD9645-125EBZ]] or [[adi>AD9635|AD9635-125EBZ]] board, and to the [[adi>hsadcevalboard|HSC-ADC-EVALCZ]]. |
| * Check that the USB cable is properly connected from the PC to the [[adi>hsadcevalboard|HSC-ADC-EVALCZ]]. | * Check that the USB cable is properly connected from the PC to the [[adi>hsadcevalboard|HSC-ADC-EVALCZ]]. |
| * The LED on the **VisualAnalog ADCDataCapture** block should be green. If it is red push the USB button on the same block to refresh the connection.\\ | * The LED on the **VisualAnalog ADCDataCapture** block should be green. If it is red push the USB button on the same block to refresh the connection.\\ |
