TEXAS INSTRUMENTS ADS6149EVM Technical data

TSW1200

HP8644B

SynthesizedSignal

Generator

ClockSource

HP8644B

SynthesizedSignal

Generator

InputSource

LCFilter

10-MHzReferenceClock

ADS6149EVM

5 V

J 7

Quick Start Guide

SLAL176 – December 2008

ADS6149EVM

1 EVM Quick-Start Procedure

The ADS6149 EVM provides numerous options for providing clock, input frequency and power to the ADC under evaluation. The quick start procedure describes how to quickly get initial results using the default configuration of the EVM as it was shipped. The EVM can be put back to default configuration by setting all jumpers the default values as described in Table 1 . The default configuration of the EVM is for the Input Frequency (IF) and the clock input is for each to be a single ended input that is transformer-coupled to the ADC. The default configuration for the power supply is to provide a single 5V supply to the red banana jack J7, PWR_IN. The default configuration for the EVM is to control the modes of operation by jumper settings for parallel input control pins rather than serial SPI control of the register space. The other modes of operation of the EVM are described in the ADS6149 EVM Users Guide (SLWU061 )

CAUTION

Voltage Limits: Exceeding the maximum input voltages can damage EVM components. Undervoltage can cause improper operation of some or all of the EVM components.

A quick-setup procedure for the default configuration of the ADS6149EVM follows:.

1. Verify all jumper settings against the schematic jumper list in Table 1 .

SLAL176 – December 2008 ADS6149EVM 1

Submit Documentation Feedback

EVM Quick-Start Procedure

www.ti.com

Table 1. Jumper List

Jumper Function Default Jumper Setting

Interface Circuit Operational Amplifier THS4509 (Bypassed)

SJP1 AMP_OUT+ 1-2 SJP2 AMP_OUT– 1-2

JP7 PD 1-2

SJP5 AMPIN- 1-2

ADC Circuit

JP12 Parallel 1-2 JP11 SDA open

JP9 SEN 1-2

JP15 OE open

J2 DFS open J3 MODE 1-2 J1 SEN open

Clock Interface Circuit (Bypassed)

SJP4 CLOCKIN 1-2 SJP7 CLOCKIN, Y0, Y1P SELECT 1-2 SJP6 Y1N SELECT 1-2

J14 PWRDWN CDC 1-2

Power Supply

JP13 3.3VA_IN 1-2 JP14 3.3VD_IN 1-2 JP16 TPS79501 INPUT SELECT 1-2 JP19 5V_AUX 1-2 JP17 TPS5420 INPUT SELECT NO SHUNT

2. Connect the 5-V supply between J7 and J12 (GND). If you are using the TSW1200 for capture, it also can be used to source 5 V for the EVM. On the TSW1200, configure JP8 to short 1-2, J22 to short 1-2, and jumper over 5 V from the banana jacks on the TSW1200 to J7 on the ADC EVM. Do not connect a voltage source greater than 5.5 V.

3. Switch on power supplies.

4. Using a function generator with 50- Ω output impedance, generate a 0-V offset, 1.5-Vpp sine-wave clock into J19. The frequency of the clock must be within the specification for the device speed grade.

5. Use a frequency generator with a 50- Ω output impedance to provide a 0-V offset, –1-dBFS-amplitude sine-wave signal into J6. This provides a transformer-coupled differential input signal to the ADC.

6. Connect the TSW1200 or suitable logic analyzer to J10 to capture the resulting digital data. If a TSW1200 is being used to capture data, follow the additional alphabetically labeled steps.

a. After installing the TSW1200 software and connecting the TSW1200 to the USB port, open the

TSW1200 software. b. Depending on the ADC under evaluation, select from the TI ADC Selection pulldown menu. c. Change the ADC Sample Rate and ADC Input Frequency to match those of the signal generator. d. After selecting a Single Tone FFT test, press the Capture Data button.

2 ADS6149EVM SLAL176 – December 2008

Submit Documentation Feedback

+ 1 hidden pages