THS56X1EVM for the THS5641A/51A/61A/71A 8-, 10-,12-, AND 14-Bit CommsDAC™ Digital-to-Analog Converters User's Guide Literature Number: SLAU032C February 2001 – Revised April 2011
Contents ....................................................................................................................................... 5 EVM Overview .................................................................................................................... 7 1.1 System Block Diagram ..................................................................................................... 8 1.2 CommsDAC System Description ........................................................................
www.ti.com List of Figures 1-1. THS56X1 EVM Block Diagram ............................................................................................ 8 1-2. Mating of Connectors on the THS56X1 EVM to the Tektronix HFS9009 Pattern Generator 1-3. 1-4. 1-5. 2-1. 2-2. 2-3. 2-4. 2-5. 2-6. 3-1. 3-2. 3-3. 3-4. 3-5. 3-6. ................... Mating of Connectors on the THS56X1 EVM to the SMA–Ribbon Cable Adapter ............................... Mating of Connectors on the C542DSK to the C542 DSKplus ..........
List of Tables SLAU032C – February 2001 – Revised April 2011 Submit Documentation Feedback Copyright © 2001–2011, Texas Instruments Incorporated
Preface SLAU032C – February 2001 – Revised April 2011 Read This First About This Manual This user’s guide describes the characteristics, operation, and use of the THS56X1 evaluation module (EVM).
Read This First SLAU032C – February 2001 – Revised April 2011 Submit Documentation Feedback Copyright © 2001–2011, Texas Instruments Incorporated
Chapter 1 SLAU032C – February 2001 – Revised April 2011 EVM Overview This user’s guide describes the characteristics, operation, and use of the THS56X1 evaluation module (EVM). The THS56X1 EVM can be connected to the TMS320C542/TMS320C54xx DSP and controlled by very user friendly software—TI’s Code Composer Development Environment, or to a pattern generator.
System Block Diagram 1.1 www.ti.com System Block Diagram The THS56X1 EVM provides a practical platform for evaluating the following devices: • THS5671A 14-bit resolution, 100 MSPS CommsDAC • THS5661A 12-bit resolution, 100 MSPS CommsDAC • TLV5651A 10-bit resolution, 100 MSPS CommsDAC • THS5641A 8-bit resolution, 100 MSPS CommsDAC The EVM supports the SOIC (DW) package style, but all devices are available in other packages (see Table 1-1). Table 1-1.
CommsDAC System Description www.ti.com Figure 1-1 comprises two input buffers, CommsDAC control logic, a CommsDAC, an external Vref, a transformer, and an operational amplifier(op amp). This illustration provides a general overview of the EVM. It is not meant to replace the circuit diagram, but to give a brief indication of the features and functions available. It should be read in combination with the circuit diagram supplied and the device data sheet SLAS247A. 1.
EVM Operating Modes www.ti.com 1.2.2 Control/Interface The control signals can be derived from either a DSK/microprocessor or from a dedicated GND and 3-V to 5-V supply connected to J3. The signals from either source are similar. The decision regarding which host system to use is left to of the user. 1.2.3 Output Stage Several circuits for achieving a single-ended output from the DAC’s differential outputs are designed into the THS56X1 EVM. Figure 3-1 shows the arrangement of the output circuits. 1.
Power and Cabling Requirements www.ti.com 1.3.3 Analog Output The techniques used in a design of this type are different from those used in lower speed DACs. Single-ended analog output is derived from the THS56X1A CommsDAC differential outputs IOUT1 and IOUT2 via a 1:1 RF transformer. A THS3001 operational amplifier (op amp) is a convenient way to derive a buffered noninverting single-ended output, a buffered inverting single-ended output, or a buffered differential to single-ended output. 1.
Printed Circuit Assembly as Part of a System www.ti.com Tektronix HFS9009 Pattern Generator SMA to Ribbon Cable Adapter THS56X1 EVM Figure 1-2.
Printed Circuit Assembly as Part of a System www.ti.com SMA to Ribbon Cable Adapter THS56X1 EVM Figure 1-3.
Printed Circuit Assembly as Part of a System www.ti.com Power Supply Cable THS56X1 EVM Detail A C54X Adapter Board Red conductor indicates pin 1 TMS320C54X DSKplus Detail B V notch indicates pin 1 CAUTION Connector and ribbon cable are polarity sensitive. See Details A and B Figure 1-4.
Printed Circuit Assembly Options Available www.ti.com 1.5.3 CommsDAC Output Configurations The THS56X1A CommsDAC output can be configured as single-ended outputs or as a differential output (see also THS5661A, 12-bit, 100MSPS, CommsDAC data sheet SLAS247A). Differential output configuration requires IOUT1 and IOUT2 to feed directly into SMA connectors, J8 and J9 (see Figure 1-5). DAC J8 22 R24 49.9 Ω C25 IOUT1 J9 21 C32 IOUT2 R29 49.9 Ω Figure 1-5. Connecting the THS56X1A Outputs to J8 and J9 1.
EVM Overview SLAU032C – February 2001 – Revised April 2011 Submit Documentation Feedback Copyright © 2001–2011, Texas Instruments Incorporated
Chapter 2 SLAU032C – February 2001 – Revised April 2011 Getting Started This chapter describes the physical characteristics and PCB layout of the EVM, and lists the components used on the module. Topic 2.1 2.2 ........................................................................................................................... Page Physical Description .......................................................................................... 18 Parts List ..........................................
Physical Description 2.1 www.ti.com Physical Description The PWB is constructed in four layers as shown in the following illustrations. The dimensions of the PWB are 4.25 in × 3.375 in (107.95 mm × 85.73 mm). See Figure 2-1. Component Side Tracking Layer Layer 1 DGND/AGND Layer 2 DVDD/AVDD Layer 3 Tracking Layer Layer 4 Solder Side Figure 2-1. PWB Layers Figure 2-2 through Figure 2-5 show the tracking for each layer. Figure 2-2.
Physical Description www.ti.com Figure 2-3. Board Layout, Layer 2 Figure 2-4.
Physical Description www.ti.com Figure 2-5. Board Layout, Layer 4 Figure 2-6.
Parts List www.ti.com 2.2 Parts List This table lists the parts required for the THS56X1 EVM assembly. REFERENCE DESIGNATION QTY (1) PART NUMBER (1) DESCRIPTION MANUFACTURER 3 C1, C22, C31 1206ZC105KAT2A Ceramic 1 µF, 10 V, X7R, 10% AVX 4 C18, C19, C28, C35 ECSTOJY475 6.3 V, 4.7 µF, tantalum Panasonic 3 C15, C24, C4 ECSTOJY106 6.3 V, 10 μF, tantalum Panasonic Ceramic, not installed, 50 V, X7R, 10% 0 C25, C32 6 C14, C2, C20, C26, C29, C33 12065C103KAT2A Ceramic, 0.
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Chapter 3 SLAU032C – February 2001 – Revised April 2011 User Configurations This chapter describes the user-definable options. Topic 3.1 3.2 3.3 3.4 3.5 3.6 3.7 ........................................................................................................................... Schematic Diagram ........................................................................................... User Options .................................................................................................
User Configurations 4.7 µF + C35 J7 6 U9 C33 J6 J4 Copyright © 2001–2011, Texas Instruments Incorporated 3 2 1 R25 TDB T1 4.7 µF C28 2 3 L2 L3 3 1 C26 –5VA W8 R24 49.9 C9 0.1 µF C23 0.1 µF R23 100 0.1 µF 0.01 µF C27 750 R28 750 R30 W9 T1–1T–KK81 + 750 THS3001 4 –5VA R26 0.1 µF 0.01 µF C34 +5VA 10 R22 7 +5VA C25 D E F A B C FB2 + 10 µF C15 + C32 C24 10 µF 4.7 µH R16 3.0 K D2 4.7 µH FB4 W7 W6 J9 1 µF C22 1 µF C31 R29 49.9 C20 –5VA 0.
User Options www.ti.com 3.2 User Options The PCA ships in a state that enables immediate evaluation of the digital-to-analog converter (DAC). However, you can reconfigure various options through hardware. This chapter discusses these options to ensure that any reconfiguration is conducted properly. The hardware on the PCA falls into various groups: • 18 jumpers • 4 wire links Table 3-1 lists jumper options, a brief description of each function, and information on where the option can be found. Table 3-1.
Analog/Digital Supply Voltages www.ti.com A A A A Figure 3-2. Reconfiguration Hardware Location 3.3 Analog/Digital Supply Voltages Two options supply power to the digital section of the EVM: • 3.3-V or 5-V digital DVDD (for 5-V operation replace U1 and U2 with SN74HC245) • 5-V only analog AVDD Configure the power supply voltages in accordance with the following tables. Table 3-2. Analog Voltage Supply Configuration Options J4 J2 J4–1 +5 V J2–1 +3.
Digital Input Configurations www.ti.com 3.4 Digital Input Configurations Various options are available to configure the analog inputs. This section describes these options, along with the jumper settings required. The two alternatives for the analog inputs are given in the following table. Table 3-3.
Generating a Voltage Reference www.ti.com 5 VA W3 DAC EXTLO 3 J1 D[0–15] D[2–15] 2 D[0–13] W4 EXTIO 1 IOUT 1 50 Ω BIASJ DVDD Radj W2 J1 Pin 33 MODE 1 CLKOUT W5 2 3 IOUT 2 50 Ω CLK DAC Clock J5 Figure 3-3. Direct Connect Jumper Configuration for THS56X1A Table 3-4. Shipping Condition of Jumpers W1 Through W9 Jumper 3.
Generating a Voltage Reference www.ti.com THS56x1A 5 VA EXTLO W3 3 EXTIO 2 BIAS 1 R14 Figure 3-4. Jumper Configuration for Internal Reference Voltage 3.5.2 Onboard External Reference To select the onboard external reference voltage, the user should follow the jumper configuration shown in Table 3-6. Table 3-6.
External Clock www.ti.com DAC 5 VA W3 3 EXTLO W4 2 1 1 2 EXTIO BIAS R14 Onboard External Reference Voltage Figure 3-5. Jumper Configuration for External Reference CAUTION Under no circumstance should the external reference voltage exceed 1.25 V. 3.6 External Clock The CommsDAC requires an external clock. Two possible external sources for the clock are required by the CommsDAC.
External Clock www.ti.com 3.6.2 C542/C54xxDSK/Microprocessor Mode A DSP subsystem such as the C54X DSPplus/C5410 DSK provides some advantage when evaluating the DAC performance with signals, such as W-CDMA data points and arbitrary generated waveform data points. The clock frequency, via the ’C54x DSK adapter board, is set at 40 MHz. 3.6.
Connector Pin and Function Assignments 3.7 www.ti.com Connector Pin and Function Assignments This section details the pinouts and functions for all user connectors. Table 3-7. Connector Pin and Function Assignments Reference Designator J1 Function Data bits 0 through 13 and CLKOUT input J2, J4 Supplies power to the EVM J3 Input control signals used to create EVM chip select J5 Input for a clock signal source J6,J7,J8,J9 DAC output signal Table 3-8.
Connector Pin and Function Assignments www.ti.com Table 3-11.
User Configurations SLAU032C – February 2001 – Revised April 2011 Submit Documentation Feedback Copyright © 2001–2011, Texas Instruments Incorporated
Chapter 4 SLAU032C – February 2001 – Revised April 2011 Control Modes The SLEEP, MODE, EXTLO, EXTIO and BIASJ pins of the THS5671A/ THS5661A/THS5651A/THS5641A control various DAC features and functions. This section describes the function of these pins. Topic 4.1 4.2 4.3 4.4 4.5 ........................................................................................................................... SLEEP Input Pin .........................................................................................
SLEEP Input Pin 4.1 www.ti.com SLEEP Input Pin The SLEEP pin is used to power down the device. It is an active high asynchronous power-down input. The device has an internal pulldown resistor. So for normal operations of the device, it is not necessary to tie the pin to DGND. The device requires 5 µS to power down and 3 mS to power up. W5 is used to control the SLEEP input. 4.2 MODE Input Pin MODE bit = 1 When the MODE pin is connected to DVDD, the device is configured to read 2s complement input data.
Chapter 5 SLAU032C – February 2001 – Revised April 2011 Software The code listed in this chaper runs on the 40 MHz C542 DSKplus. It allows you to output a 220 kHz sinewave from the DAC, while the DAC is being clocked at 40 MHz. Running the code on a 100 MHz C542 DSP or the C5410 DSP will give output sinewave speeds up to 2 MHz. The program is also useful for checking that the THS56X1 EVM is functioning properly. The complete C-callable assembly code is shown in List 1.
www.ti.com List 1. Complete Software Listing for a Sinewave Generator ************************************************************************** * TITLE : THS5651 Interface routine * * FILE : DAC.ASM * * FUNCTION : MAIN * * PROTOTYPE : void MAIN () * * CALLS : N/A * * PRECONDITION : N/A * * POSTCONDITION : N/A * * DESCRIPTION : main routine is used the generated a sine wave * * : input for THS56x1 EVM using the ’C542 DSKplus board * * AUTHOR : AAP Application Group, L.
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