Texas Instruments ADS5411 User manual

ADS5423/24/33 and ADS5411 EVMUser Guide
User's Guide
February 2006
SLWU020B

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Contents
1 Overview ................................................................................................................... 51.1 Purpose .............................................................................................................. 51.2 EVM Basic Functions............................................................................................... 51.3 Power Requirements ............................................................................................... 51.3.1 Voltage Limits .............................................................................................. 51.4 EVM Operational Procedure ...................................................................................... 5
2 Circuit Description ..................................................................................................... 72.1 Schematic Diagram ................................................................................................. 72.2 Circuit Function ..................................................................................................... 72.2.1 Analog Inputs .............................................................................................. 72.2.2 Power ........................................................................................................ 72.2.3 Outputs ...................................................................................................... 7
3 Parts List .................................................................................................................. 9
4 Physical Description ................................................................................................. 114.1 PCB Layout ........................................................................................................ 114.2 Schematics ......................................................................................................... 17
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List of Figures
4-1 Top Layer .................................................................................................................... 114-2 Layer 2, Ground Plane .................................................................................................... 124-3 Layer 3, Power Plane #1 .................................................................................................. 134-4 Layer 4, Power Plane #2 .................................................................................................. 144-5 Layer 5, Ground Plane .................................................................................................... 154-6 Layer 6, Bottom Layer .................................................................................................... 16
List of Tables
1-1 Three Pin Jumper List Table ............................................................................................... 62-1 Output Connector J9 ........................................................................................................ 82-2 Test Point Description ....................................................................................................... 83-1 Bill of Materials for EVM .................................................................................................... 9
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1.1 Purpose
1.2 EVM Basic Functions
1.3 Power Requirements
1.3.1 Voltage Limits
1.4 EVM Operational Procedure
Chapter 1SLWU020B – February 2005 – Revised February 2006
Overview
This User’s Guide document gives a general overview of the ADS5423/24/33 and ADS5411 evaluationmodule (EVM) and provides a general description of the features and functions to be considered whileusing this module.
The EVM provides a platform for evaluating the ADS5423/24/33 14-bit analog-to-digital converter (ADC)under various signals, references, and supply conditions. This evaluation module also allows theevaluation of the ADS5411, an 11-bit analog-to-digital converter. This document should be used incombination with the EVM schematic diagram supplied.
Analog input to the ADC is provided via external SMA connectors. The single-ended input the userprovides is converted into a differential signal at the input of the device. One input path uses a differentialamplifier, while the other input is transformer coupled.
The EVM provides an external SMA connector for input of the ADC clock. The single-ended input the userprovides is converted into a differential signal at the input of the device.
Digital output from the EVM is via a 40-pin connector. The digital outputs from the ADC are bufferedbefore going to the connector.
Power connections to the EVM are via banana jack sockets. Separate sockets are provided for the ADCanalog and digital supplies, the external buffer supply, and the differential amplifier supply.
The EVM can be powered directly with only two supplies: a 3.3-V supply for the ADC digital driver supplyand external buffer supply, and 5 V for the ADC analog supply if using the EVM with transformer coupledanalog inputs. If using the differential amplifier analog inputs, ±5 V is required. Provision has also beenmade to allow the EVM to be powered with independent 3.3-V supplies to provide higher performance.
Exceeding the maximum input voltages can damage EVM components. Under voltage may causeimproper operation of some or all of the EVM components.
The EVM provides a flexible means of evaluating the ADS5423/24/33 or ADS5411 in a number of modesof operation. A basic setup procedure that can be used as a board confidence check is as follows:1. Verify all jumper settings against the schematic jumper list in Table 1-1 .
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*dBFS +20logcaptured max code *captured min code
2N, where N is the number of bits.
EVM Operational Procedure
Table 1-1. Three Pin Jumper List Table
JUMPER FUNCTION LOCATION: PINS 1–2 LOCATION: PINS 2–3 DEFAULT
SJP3 Provides AIN+ source to ADC Source provided from T2 Source provided from Diff Amp 1–2deviceSJP4 Provides AIN– source to ADC Source provided from Diff Amp Source provided from T2 2-3device
2. Connect supplies to the EVM as follows:+5 V (4.75 V–5.25 V) ADC analog supply to J3 and return to J2.+3.3 V (3 V–3.6 V) digital buffer supply to J4 and J1 and return to J63. Switch power supplies on.4. Use a function generator with 50- Ωoutput to input a 105-MHz, 0-V offset, 1-Vrms sine-wave signal intoJ5. The frequency of the clock must be within the specification for the device speed grade.5. Supply an input signal by using a frequency generator with a 50- Ωoutput to provide a 15.5 MHz, 0-Voffset, –1-dBFS amplitude sine-wave signal into J11. A full-scale input tone into the ADC device is adifferential 2.2 Vpp and dBFS can be calculated by using the following formula:
6. The digital pattern on the output connector J9 should now represent a 2's compliment sine wave andcan be monitored using a logic analyzer.
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2.1 Schematic Diagram
2.2 Circuit Function
2.2.1 Analog Inputs
2.2.2 Power
2.2.3 Outputs
Chapter 2SLWU020B – February 2005 – Revised February 2006
Circuit Description
The schematic diagram for the EVM is attached at the end of this document.
The following paragraphs describe the function of EVM circuits. See the relevant data sheet for the deviceoperating characteristics.
The EVM can be configured to provide the ADC with either transformer-coupled or differential amplifierinputs from a single-ended source. The default configuration uses the transformer configuration for whichthe layout has been optimized to give the best performance. The inputs are provided via SMA connectorsJ11 for transformer coupled input and J10 for differential amplifier input. To setup for one of these options,the EVM must be configured as follows:1. For a 1:1 transformer coupled input to the ADC, a single ended source is connected to J11. SJP3 haspins 1 and 2 shorted and SJP4 has pins 2 and 3 shorted. This is the default configuration for the EVM.2. For a differential input into the amplifier, the input source is connected to J10. SJP3 has pins 2 and 3shorted and SJP4 has pins 1 and 2 shorted. ±5VDC must be connected to the board to provide powerto U3 and U4 for this configuration.
Power is supplied to the EVM via banana jack sockets. A separate connection is provided for a +3.3Vdigital buffer supply (J1 and J2), 5-V analog supply (J3 and J2), ±5-V amplifier supply (J7, J8, and J12),and 3.3-V external buffer supply (J4 and J6). A single 3.3-V buffer supply could be used by installing L6.In this case, connect the 3.3 V to J1 and the return to J2.
The data outputs from the ADC are buffered using a Texas Instruments SN74AVC16244. Output dataheader J9 is a standard 40-pin header on a 100-mil grid, and allows easy connection to a logic analyzer.The connector pinout is listed in Table 2-1 . Furthermore, two test points are provided and can bemonitored using a multimeter. Description of the test points is listed in Table 2-2 .
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Circuit Function
Table 2-1. Output Connector J9
J9 PIN DESCRIPTION J9 PIN DESCRIPTION
1 CLK 21 DATA BIT 62 GND 22 GND3 NC 23 DATA BIT 74 GND 24 GND5 NC 25 DATA BIT 86 GND 26 GND7 NC 27 DATA BIT 98 GND 28 GND9 DATA BIT 0 (LSB) 29 DATA BIT 1010 GND 30 GND11 DATA BIT 1 31 DATA BIT 1112 GND 32 GND13 DATA BIT 2 33 DATA BIT 1214 GND 34 GND15 DATA BIT 3 35 DATA BIT 13 (MSB)16 GND 36 GND17 DATA BIT 4 37 OVERFLOW18 GND 38 GND19 DATA BIT 5 39 DRV
DD
20 GND 40 GND
Table 2-2. Test Point Description
TEST POINT FUNCTION
J14 Monitor Vref (AVDD/2)J17 Monitor DMID (DVDD/2)
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Chapter 3SLWU020B – February 2005 – Revised February 2006
Parts List
Table 3-1 lists the parts used in constructing the EVM
Table 3-1. Bill of Materials for EVM
VALUE QTY PART NUMBER VENDOR REF DES NOT
INSTALLED
CAPACITORS
0.1 µF, 25 V, +80/–20% 4 ECJ-0EF1E104Z Panasonic C1, C2, C3, C4Capacitor
0.01 µF, 25 V, +80/–20% 6 ECJ-0EF1E103Z Panasonic C30, C31, C32, C33,Capacitor C34, C35220 pF, 50 V, 5%, Capacitor 6 ECJ-OEC1H221J Panasonic C41–C4622 pF, 50 V, 5%, Capacitor 1 ECJ-1VC1H220J Panasonic C26220 pF, 50 V, 5%, Capacitor 3 ECJ-1VC1H221J Panasonic C47, C48, C490.01 µF,16 V, 10% Capacitor 7 ECJ-1VB1C103K Panasonic C27, C28, C29, C36,C37, C38, C390.1 µF,16 V, 10% Capacitor 12 ECJ-1VB1C104K Panasonic C6, C8, C11, C12,C14, C16, C17, C18,C19, C24, C25, C40470 pF,50 V, 5% Capacitor 4 ECJ-1VC1H471J Panasonic C20, C21, C22, C2310 µF, 10 V, 10%, Capacitor 1 ECS-T1AX106R Panasonic C1533 µF, 10 V, 10% Capacitor 5 ECS-T1AX336R Panasonic C5, C7, C9, C10,C13
RESISTORS
51.1 Ω2 CTS_742 CTS R5, R250Ω2 CTS_742 CTS R7, R824.9 Ωresistor, 1/16 W, 1% 4 ERJ-3EKF24R9V Panasonic R6, R11, R12, R2749.9 Ωresistor, 1/16 W, 1 % 5 ERJ-6EKF49R9V Panasonic R1, R4, R10, R18, R9R2336.5 Ωresistor, 1/16 W, 1% 2 ERJ-6EKF36R5V Panasonic R2, R3499 Ωresistor, 1/16 W, 1% 4 ERJ-6EKF4990V Panasonic R14, R15, R16, R170Ωresistor, 1/16 W, 1% 1 ERJ-6ENF0R00V Panasonic R24200 Ωresistor, 1/16 W, 1% 0 ERJ-3RKF2000X Panasonic R13
FERRITE BEAD, JUMPER, TRANSFORMER, JACKS, CONN etc.
Ferrite Bead 5 EXC-ML32A680U Minicircuits L1–L5ADT1-1WT 1 ADT1-1WT Minicircuits T2ADT4-1WT 1 ADT4-1WT NEWARK T3SMA End Small 3 16F3627 Keystone J5, J10, J11Red Test Point 1 5001K-ND Keystone J14Black Test Point 1 5000K-ND Allied J17Red Banana Jack 5 ST-351A Allied J1, J3, J4, J8, J12Black Banana Jack 3 ST-351B Samtec J2, J6, J740-Pin IDC Connector 1 TSW-120-07-L-D J93 Circuit Jumper 2 SJP3, SJP4
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Table 3-1. Bill of Materials for EVM (continued)
VALUE QTY PART NUMBER VENDOR REF DES NOT
INSTALLED
ICs
ADS5423/24/33 or ADS5411 1 ADS5423/24/33 or Texas Instruments U1ADS5411SN74AVC16244 1 SN74AVC16244DGG Texas Instruments U2THS4503 1 THS4503 Texas Instruments U3THS4601 1 THS4601 Texas Instruments U4Surface Mount Jumper Location: SJP3 (2–1), SJP4 (2–3)
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