Texas Instruments ADS1610EVM Manuale utente

User's GuideSLAU180A – May 2006 – Revised August 2006

ADS1610EVM

This user’s guide describes the characteristics, operation, and use of the ADS161016-bit, 10-MSPS high-speed, parallel interface, analog-to-digital converter evaluationboard. A complete circuit description, a schematic diagram, and a bill of materials isincluded. Contact the Product Information Center or e-mail [email protected]for questions regarding this EVM.

Contents1 EVM Overview ...................................................................................... 22 Introduction .......................................................................................... 23 Digital Interface ..................................................................................... 44 Power Supplies ..................................................................................... 85 Using the EVM ...................................................................................... 86 Related Documentation from Texas Instruments ............................................. 13Appendix A Bill of Materials .......................................................................... 14Appendix B Layout and Schematic .................................................................. 17

List of Figures

1 Input Circuitry ....................................................................................... 32 TSW1100 and ADS1610EVM Setup ............................................................. 83 TSW1100 Screen Shot ............................................................................ 94 Test Results With a 100-kHz Input Frequency ................................................ 105 Test Results With a 250-kHz Input ............................................................. 106 Test Results With a 500-kHz Input ............................................................. 117 Test Results With a 1-MHz Input ............................................................... 118 Test Results With a 2-MHz Input ............................................................... 12B-1 Top Layer – Layer 1 .............................................................................. 17B-2 Split Ground Plane – Layer 2 .................................................................... 17B-3 Split Power Plane – Layer 3 ..................................................................... 18B-4 Split Power Plane – Layer 4 ..................................................................... 18B-5 Split Ground Plane – Layer 5 .................................................................... 19B-6 Bottom Layer – Layer 6 .......................................................................... 19

List of Tables

1 Reference Voltages ................................................................................ 32 Jumper Setting ...................................................................................... 43 Switch Function Control, SW1 .................................................................... 44 Digital Jumper ....................................................................................... 55 Memory Space Address ........................................................................... 66 Assignment and Function at J18 ................................................................. 67 Assignment and Function at J2 ................................................................... 78 Assignment and Function at J10/P10 ............................................................ 7

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1 EVM Overview

1.1 Features

2 Introduction

2.1 Analog Interface

2.1.1 Analog Input Signal Conditioning

EVM Overview

•Full-featured evaluation board for the ADS1610 10-MSPS high-speed 16-bit, single-channel, parallelinterface, delta sigma type analog-to-digital converter.•Onboard signal conditioning•Onboard reference, with recommended buffer circuitry•Input and output digital buffers•Basic system-level logic decoding.

The ADS1610 is high-speed, high-resolution delta sigma ( ∆ Σ ) analog-to-digital converter. It features a datarate of 10 MSPS and an advanced multistage analog modulator combined with an on-chip digitaldecimation filter. The ADS1610 achieves 86 dBFS signal-to-noise ratio (SNR) in a 5-MHz signalbandwidth. The device offers outstanding performance at these speeds with a total harmonic distortion of–94 dB. The ADS1610 ∆ Σ topology provides key system-level design advantages with respect to antialiasfiltering and clock jitter. The design of the antialias filter is simplified because the on-chip digital filtergreatly attenuates out-of-band signals. The ADS1601 filter has a brick wall response with a flat pass band(±0.0002 dB of ripple) followed immediately by a wide stop band (5 MHz to 55 MHz). Clock jitter becomesespecially critical when digitizing high-frequency, large-amplitude signals. The ADS1610 significantlyreduces clock jitter sensitivity by an effective averaging of clock jitter as a result of oversampling the inputsignal. Output data is supplied over a parallel interface and easily connects to TMS320 digital signalprocessors (DSP). The power dissipation can be adjusted with an external resistor, allowing for reductionat lower operating speeds. With its outstanding high-speed performance, the ADS1610 is well-suited fordemanding applications in data acquisition, scientific instruments, test and measurement equipment, andcommunications.

The ADS1610EVM is a stand-alone, full-featured system that offers data-sheet performance. Additionally,the EVM conforms to a common electrical and mechanical pinout for digital I/O enabling it to be quicklyadapted to various host platforms.

The analog interface consists of the following subsections:1. Analog input2. External reference generation3. Modulator clock

The ADS1610 measures the differential signal, VIN = (AINP-AINP), against the differential reference,VREF = (VREFP – VREFN). The analog input signal can be applied to the board through the SMAconnectors J4 and J41. The board arrives with the input circuitry configured for single-ended in, differentialoutput, as shown in Figure 1 . It has a 50 - Ωtermination; therefore, the signal source needs to be able toprovide a 3 -V single-ended signal with this termination. The single-ended analog signal can be applied atJ4.

The onboard input driver is designed using the wide-band, low-distortion, fully differential amplifier(THS4503) from Texas Instruments. The amplifier is configured for a gain of 2. The THS4503 can directlyaccept differential signals or be used to convert a single-ended input signal to a differential one. Thefactory-set condition is for a single-ended input converted to fully differential at the output of the THS4503.The desired output common-mode signal is fed through pin 2 of the THS4503. The required commonmode is 2.5 V. This voltage is generated onboard in the reference voltage generation circuitry.

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Vin

THS4503

AINP

AINN

47 pF

787 W

+VCC

0.1 Fm

10 Fm

0.1 Fm

12 W

100 pF

12 W100 pF

100 pF

787 W

-VCC

374 W

402 W

56.2 W

Vocm

+2.5 V

47 pF

2.1.2 External Reference Generation

IntroductionThe ADS1610 has relaxed antialiasing filter requirements because it is a delta sigma converter. A simpleantialiasing filter comprising a 24- Ωresistor and a 300- pF capacitor with a –3-dB bandwidth of 22 MHz isused at the output of the THS4503.

Figure 1. Input Circuitry

The ADS1610 operates from an external voltage reference. The reference voltage VREF is set by thedifferential voltage between VREFN and VREFP: VREF = (VREFP-VREFN). VMID must be 2.5 V.

The ADS1610EVM has onboard reference generation circuitry using the low-noise, high-speed THS4031from Texas Instruments. Three of these amplifiers are used to generate the REFP (VREFP), CML (VMID)and REFM (VREFM) voltages. The CML voltage generated in this circuitry also is used as thecommon-mode voltage for the input driver (THS4503). The three reference voltages can be adjusted usingthe trim potentiometers R37, R38, and R40.

The reference voltage source for the onboard reference generation circuitry is selectable. If W1 jumperposition is across pins 1 and 2, then AVDD1 is selected. When the jumper is placed across pins 2 and 3,the REF02 is selected as the source. The ADS1610EVM leaves the factory with a short across pins 2 and3 of W1.

The factory-set voltages are 4 V, 2.5 V, and 1 V for VREFP, VCML, and VREFM, respectively. Thesevoltages provide a reference voltage of 3 V single-ended. The ADS1610 with a 3-V reference can achievean SNR of 86 dBFS in the 0 – 5-MHz bandwidth.

If the application requires a smaller reference voltage, then potentiometers R37 and R38 can be adjustedto generate the desired voltage. Be aware that there is a tradeoff between SNR and reference voltages.Table 1 gives the reference voltage versus SNR tradeoff.

Table 1. Reference Voltages

Reference VREFM VCML VREFP Peak In-Band SNR

3 V 1 2.5 4 86

2.5 V 1.25 2.5 3.75 85

2 V 1.5 2.5 3.5 83

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2.1.3 Clock Source

3 Digital Interface

3.1 Board-Level Control

3.1.1 DIP Switch Options

Digital Interface

For more information on the reference generation circuitry, see sheet 6 of the ADS1610EVM schematic, atthe end of this user’s guide.

The ADS1610 uses the external clock signal applied to the CLK input pin as the modulator clock. Inputsampling is controlled by this clock signal. As with any high-speed data converter, a high-quality clock isessential for achieving optimum performance. In order to maximize SNR performance of the converter,keep the jitter on this clock source below those recommended in the ADS1610 data sheet.

The modulator clock can be fed into the ADS1610 from two sources. It can be applied via SMA connector(J4) or from the onboard source. The onboard source is the 60-MHz oscillator installed at X1. Thefactory-set condition applies the onboard 60-MHz oscillator to the CLK pin of the ADS1610. Theuser-supplied external clock must be fed to the board through the SMA connector, J4. The board has afootprint at R9 for a 50 - Ωtermination on this line. It can be installed at the user’s discretion. If R9 is notinstalled by the user and the user clock is generated from a 50- Ωsource, then be sure to reduce the clockamplitude to half.

To switch from the onboard oscillator to the user clock applied at J4, change the position of jumper of W3from pins 1–2 to 2–3.

The performance of the ADS1610 is sensitive to clock jitter; see the data sheet for the requirements.

Table 2. Jumper Setting

Reference 1-2 2-3 DescriptionDesignator

W1 Installed

(1)

Not installed Set voltage on AVDD1 as source for the reference generation circuitry.Not installed Installed Set voltage REF02 as the source for the reference generation circuitry.W2 Installed

(1)

Not installed Enable 60-MHz oscillatorNot installed Installed Disable 60-MHz oscillatorW3 Installed

(1)

Not installed Set modulator clock to onboard 60-MHz oscillatorNot installed Installed Set modulator clock to user-supplied clock via J4.

(1)

Factory installed

This section describes the digital sections and pinout of the ADS1610EVM.

Optional settings for the ADS1610 are set and controlled manually via a DIP switch – SW1. The functionscontrolled by this switch are summarized in Table 3 .

Table 3. Switch Function Control, SW1

Switch, SW1

Position Function ON(LO) OFF(HI)

1 Mode 0 pin Set M0 to 0 Set M0 to 12 Mode 1 pin Set M1 to 0 Set M0 to 13 Power-down bit Device is powered down Device is not powered down4 Not used5 Not used6 Not used

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3.1.2 Jumper Options

3.1.3 ADS1610EVM OTR LED

3.1.4 ADS1610 Reset

3.1.5 Interrupt Source

3.1.6 Base Address and Chip Select

Digital Interface

Table 3. Switch Function Control, SW1 (continued)

Switch, SW1

Position Function ON(LO) OFF(HI)

7 Not used8 Not used

Four jumpers are associated with the digital control section; their functions are detailed in Table 4 .

Table 4. Digital Jumper

Reference 1-2 2-3 DescriptionDesignator

W20 Installed Not installed Set SYNCB to output of combinatory logicNot installed Installed

(1)

Set SYNCB to user reset switchW23 Installed

(1)

Not installed Set DRDY_OUT to DRDY of ADS1610Not installed Installed Set DRDY_OUT to inverted DRDY of ADS1610.J19 2-1 Installed

(1)

N/A Set U16A pin 2 to LOW. Used in EVM address decoding logic.J19 3-4 Installed

(1)

N/A Set U17A pin 2 to LOW. Used in board address decoding logic.

(1)

Factory installed

When the analog input exceeds the positive full-scale value or goes below negative full-scale value ofVREF, the Out of Range (OTR) signal goes HIGH and remain high while the signal is out-of-range. Whenthis condition occurs, LED1 illuminates. To clear the LED, flip-flop U13 must be reset. Depending on whichposition W20 is set to, the LED can be reset manually via SW2 or through programming by issuing a WRoperation from the host processor. The factory-set condition of W20 is a short across pins 2-3. This allowsthe user to manually reset the LED and reset the ADS1610.

The ADS1610 can be asynchronously reset when the SYNC pin is driven low. In reset, all the digitalcircuits are cleared, the data bus is LOW, and DRDY is HIGH. The ADS1610 can be reset in two ways,using an manual reset via SW1 or by programming from the host system. If W20 pins 1-2 are shorted, theSYNC signal must be generated by the host system. If W20 pins 2-3 are shorted, then the SYNC signal tothe ADS1610 is generated manually by momentarily depressing switch SW2.

Some microprocessors only recognize falling edge interrupts; others only recognize rising edge interrupts.Some can be programmed to recognize either. W23 can be set by the user to select either rising edge orfalling edge. If a jumper is across pins 1 and 2, DRDY is applied to DRDY_OUT pin. If jumper short isacross pins 2 and 3, an inverted version of DRDY is applied to DRDY_OUT pin.

The EVM can be mapped into a memory location by setting a base address. The EVM has four possiblebase addresses. The base address is set by J19. When the logic state of the two external address signalsmatches the logic state set up by the two jumpers on J19 and the access is valid memory access, theEVM generates a CS signal for the ADC. This then can be further qualified as a read cycle or a write( RESET) cycle. An installed jumper is equivalent to logic 0 on the corresponding address line. Anuninstalled jumper is equivalent to logic 1 on the corresponding address line.

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3.2 External Interface

3.3 Data Connector Pinout

Digital Interface

The TMS320C6713 DSK provides two memory spaces for the daughterboards. The two memory spacesenables (CE2 and CE3) are buffered versions of the DSP outputs and are not generated by decode logicon the DSK. The 5-6K EVM uses CE2 to indicate that the access is valid. The places the daughterboardat an address space beginning at 0xA0000000.

Table 5. Memory Space Address

J19 Address Selected

1-2 3-4

0 0 0xA00000000 1 0xA00000041 0 0xA00000081 1 0xA000000C

The pinout for the ADS1610EVM has been arranged to easily mate with the growing range of interfaceadapters. The interface board that is currently available is the 5-6K Interface Board (see SLAU104 ). Thisboard enables any TMS320C5000 DSP platform or TMS320C6000 DSP platform-based DSK withstandard expansion connectors to connect to the EVM.

The data from the ADC is available at J18 and at J2. J18 is available for interfacing to 5-6K interfaceboard, user breadboard, or ribbon cable. Connector J2 is installed to allow users to connect theADS1610EVM directly to the TSW1100 data capture board (see SLAU164 ) from Texas Instruments. Theapplication section of this user’s guide explains how an ADS1610 can be evaluated using the TSW1100and ADS1610EVM.

The pin assignments and function of each of the pins on J2 and J18 are given in Table 6 and Table 7 .

Table 6. Assignment and Function at J18

Description Signal Connector Pin Connector Pin Description

Buffered data bit 0 (LSB) D0 J18.1 J18.2 GroundBuffered data bit 1 D1 J18.3 J18.4 GroundBuffered data bit 2 D2 J18.5 J18.6 GroundBuffered data bit 3 D3 J18.7 J18.8 GroundBuffered data bit 4 D4 J18.9 J18.10 GroundBuffered data bit 5 D5 J18.11 J18.12 GroundBuffered data bit 6 D6 J18.13 J18.14 GroundBuffered data bit 7 D7 J18.15 J18.16 GroundBuffered data bit 8 D8 J18.17 J18.18 GroundBuffered data bit 9 D9 J18.19 J18.20 GroundBuffered data bit 10 D10 J18.21 J18.22 GroundBuffered data bit 11 D11 J18.23 J18.24 GroundBuffered data bit 12 D12 J18.25 J18.26 GroundBuffered data bit 13 D13 J18.27 J18.28 GroundBuffered data bit 14 D14 J18.29 J18.30 GroundBuffered data bit 15 D15 J18.31 J18.32 GroundN/C J18.33 J18.34 GroundN/C J18.35 J18.36 GroundN/C J18.37 J18.38 Ground

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3.3.1 Control Connector Pinout

Digital Interface

Table 6. Assignment and Function at J18 (continued)

Description Signal Connector Pin Connector Pin Description

N/C J18.39 J18.40 Ground

Table 7. Assignment and Function at J2

Description Signal Connector Pin Connector Pin Signal Description

Ground Ground J2.1 J2.2 N/CGround Ground J2.3 J2.4 N/CGround Ground J2.5 J2.6 D0 Buffered data bit 0 (LSB)Ground Ground J2.7 J2.8 D1 Buffered data bit 1Ground Ground J2.9 J2.10 D2 Buffered data bit 2Ground Ground J2.11 J2.12 D3 Buffered data bit 3Ground Ground J2.13 J2.14 D4 Buffered data bit 4Ground Ground J2.15 J2.16 D5 Buffered data bit 5Ground Ground J2.17 J2.18 D6 Buffered data bit 6Ground Ground J2.19 J2.20 D7 Buffered data bit 7Ground Ground J2.21 J2.22 D8 Buffered data bit 8Ground Ground J2.23 J2.24 D9 Buffered data bit 9Ground Ground J2.25 J2.26 D10 Buffered data bit 10Ground Ground J2.27 J2.28 D11 Buffered data bit 11Ground Ground J2.29 J2.30 D12 Buffered data bit 12Ground Ground J2.31 J2.32 D13 Buffered data bit 13Ground Ground J2.33 J2.34 D14 Buffered data bit 14Ground Ground J2.35 J2.36 D15 Buffered data bit 15Ground Ground J2.37 J2.38 N/C

Ground Ground J2.39 J2.40 DRDY_OUT

The ADC is controlled by the signals that originate from J10/P10. The assignment and function of each pinis given in Table 8 .

Table 8. Assignment and Function at J10/P10

Description Signal Connector Pin Connector Pin Signal Description

Chip Select signal from host HOST_CSa

(1)

J10.1 J10.2 GROUNDprocessorWrite signal from host processor HOST_WR J10.3 J10.4 GROUNDRead signal from host processor HOST_RD

(1)

J10.5 J10.6 GROUNDN/C J10.7 J10.8 GROUNDN/C J10.9 J10.10 GROUNDAddress signal from host HOST_A2

(1)

J10.11 J10.12 GROUNDprocessor

Address signal from host HOST_A3

(1)

J10.13 J10.14 GROUNDprocessor

Out of Range signal OTR_INT J10.15 J10.16 GROUNDJ10.17 J10.18 GROUNDData Ready or inverted Data DRDY_OUT J10.19 J10.20 GROUNDReady signal(1)

Factory-set condition is to short these signals to ground.

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4 Power Supplies

5 Using the EVM

5.1 Development/Evaluation Board

5.1.1 EVM and TSW1100 Capture Board

Power Supplies

The ADS1610EVM arrives with CS, HOST_RD, HOST_A2, and HOST_A3 signals set LOW. This enablesthe ADS1610 and at power up allows the device to start converting. The modes pins (M0 and M1) arefactory set to enable a data rate of 10 MHz.

The ADS1610EVM board requires various power sources for operation.•A dual ±7-Vdc supply for best performance of the analog front end and reference generation circuitry.These voltages can be applied at J11.•Two +5-Vdc supplies for the ADS1610 analog supply and clock supply. Apply 5 V at J12 and J13.•A single +3-Vdc supply for digital section of the board (A/D + address decoder + buffers). Apply 3 V toJ1.

The ADS1610EVM serves two purposes. It functions as an evaluation/development board and a referencedesign.

The two common methods used to evaluate the ADS1610EVM’s performance are:1. EVM used as a stand-alone system. The user is responsible for capturing and analyzing the data,typically via a logic analyzer and analysis software (LABView, MATLAB, etc.).2. EVM used with TI’s TSW1100 data capture board solution:http://focus.ti.com/docs/toolsw/folders/print/tsw1100.html

The user’s guide for the data capture board (SLAU164 ) provides detailed information and setupinstructions.

The ADS1610EVM mates with the TSW1100 board via J2. Two data ports are available on the datacapture board; the reference designators are J1 and J2. Figure 2 shows the ADS1610 plugged into theTSW1100 board.

Figure 2. TSW1100 and ADS1610EVM Setup

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Using the EVM

Figure 3 is a screen shot of the TSW1100 front panel.

Figure 3. TSW1100 Screen Shot

Using the TSW1100 software, perform the following steps.1. Select ADS1610 from the TI Chip pulldown menu.2. Set Sampling Rate : 10 MHz (if modulator clock is 60-MHz oscillator)3. Set Waveform (Fin) frequency to test frequency; then set ARB to the frequency shown in this field.4. Select Channel 1 from the Data Capture Selector pulldown menu. If it appears grayed out, selectanother channel, and then select channel 1. It should appear enabled.5. Set data samples to 65536 from default 163846. Select Power Spectrum from the PLOT pulldown menu.7. Set FFT Window Type to NONE.8. Click Acquire Data. After data is captured and processed, check to see if dBFS field readsapproximately –6 dB. If not, adjust the signal amplitude, and then click Acquire Data. Do this untildBFS is approximately –6dB.9. Once the signal amplitude is 6 dB less FS, select Hanning from the FFT Window Type.10. Notice SFDR, THD, and SNR. The results should be similar to those shown in the following figures.

Figure 4 through Figure 8 are typical test results at different input frequencies using an Valpey Fisheroscillator (60 MHz) and the TSW1100 data capture board. The analog input signal is from a HP 33120AARB and was band-pass filtered before being applied to J4 on the ADS1610EVM.

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Using the EVM

Figure 4. Test Results With a 100-kHz Input Frequency

Figure 5. Test Results With a 250-kHz Input

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