Texas Instruments DAC5674 EVM User manual

DAC5674 EVM
September 2003 Wireless Infrastructure Products
User’s Guide
SWRU007

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Post Office Box 655303 Dallas, Texas 75265
Copyright 2003, Texas Instruments Incorporated

EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned
within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE
WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,
IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user
indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction
of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic
discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE
TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not
exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein.
Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about temperatures
and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards.
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Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2003, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within an input voltage range of 0 V to 3.3 V.
Exceeding the specified input range may cause unexpected operation and/or irreversible
damage to the EVM. If there are questions concerning the input range, please contact a TI
field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or
possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to
connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than
40°C. The EVM is designed to operate properly with certain components above 40°C as long
as the input and output ranges are maintained. These components include but are not limited
to linear regulators, switching transistors, pass transistors, and current sense resistors. These
types of devices can be identified using the EVM schematic located in the EVM User’s Guide.
When placing measurement probes near these devices during operation, please be aware
that these devices may be very warm to the touch.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2003, Texas Instruments Incorporated

Contents
v
Contents
1 Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Purpose 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 EVM Basic Functions 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Power Requirements 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 DAC5674 EVM Operational Procedure 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 PCB Layout and Parts List 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 PCB Layout 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Parts List 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Circuit Description 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Circuit Function 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.1 Input Clock 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.2 Input Data 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.3 Output Data 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.4 Internal Reference Operation 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.5 External Reference Operation 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.6 Sleep Mode 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.7 Filter Control 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.8 PLL Divider Control 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Schematics 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
2−1 DAC5674 EVM Parts List 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−1 EVM Clock Configuration 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−2 Input Connector J8 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−3 Transformer Output Configuration 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
vi
Figures
2−1 Top Layer 1 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−2 Ground Plane 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−3 Power Plane 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−4 Bottom Layer 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
Overview
Overview
This user’s guide document gives a general overview of the DAC5674
evaluation module (EVM) and provides a general description of the features
and functions to be considered while using this module.
Topic Page
1.1 Purpose 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 EVM Basic Functions 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Power Requirements 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 DAC5674 EVM Operational Procedure 1-3. . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Purpose
1-2
1.1 Purpose
The DAC5674 EVM provides a platform for evaluating the DAC5674
digital-to-analog converter (DAC) under various signal, reference, and supply
conditions. This document should be used in combination with the EVM
schematic diagram supplied.
1.2 EVM Basic Functions
Digital inputs to the DAC can be provided with CMOS level signals up to
200 MSPS through a 40-pin header. This enables the user to provide
high-speed digital data to the DAC5674.
The analog output from the DAC is available via SMA connectors. Because
of its flexible design, the analog output of the DAC5674 can be configured to
drive a 50-Ωterminated cable using a 4:1 or 1:1 impedance ratio transformer,
or single-ended referred to GND.
The EVM allows for different clock configurations. The user can input a
differential ECL/PECL or TTL/CMOS level signal, to be used to generate a
single-ended or differential clock source. See the clock section for proper
configuration and operation.
Power connections to the EVM are via banana jack sockets. Separate sockets
are provided for the analog, digital, PLL, and I/O supply.
In addition to the internal bandgap reference provided by the DAC5674 device,
options on the EVM allow external reference to be provided to the DAC.
1.3 Power Requirements
The demonstration board has four power inputs. The first, +3.3VA, is required
to be +3.3 Vdc at banana jack J9 with the return going to J11. This is the analog
supply for the DAC5674. The second, +1.8 VD, is required to be +1.8 Vdc at
banana jack J14 with the return to J16. This is the digital +1.8-V supply for the
DAC5674. The third, +3.3VCLK, is required to be +3.3 Vdc at banana jack J10
with the return at J13. This is the digital supply for the internal PLL circuitry. The
fourth, +1.8/3.3VD_IO, is required to be either +1.8 or +3.3 Vdc at banana jack
J12 with the return at J15. This is the supply for the digital I/Os. The EVM can
be powered using only two supplies, but powering from four separate supplies
provides higher performance.
Note: Voltage Limits
Exceeding the maximum input voltages can damage EVM components.
Undervoltage may cause improper operation of some or all of the EVM
components.

DAC5674 EVM Operational Procedure
1-3
Overview
1.4 DAC5674 EVM Operational Procedure
The DAC5674 EVM can be set up in a variety of configurations to
accommodate a specific mode of operation. Before starting evaluation, the
user should decide on the configuration and make the appropriate
connections or changes. The demonstration board comes with the following
factory-set configuration:
-Differential clock mode using transformer T2 and a clock input at J4
-Transformer coupled output using transformer T1
-The converter is set to operate with internal reference. Jumper W2 is
installed between pins 1 and 2.
-Full-scale output current set to 20 mA through RBIAS resistor R1
-The DAC5674 output is enabled (sleep mode disabled). Jumper W3 is
installed between pins 1 and 2.
-Reset operation controlled through S1. Jumper W5 is installed between
pins 2 and 3.
-Internal PLL is disabled. Jumper W4 is installed between pins 1 and 2.

1-4

2-1
PCB Layout and Parts List
PCB Layout and Parts List
This chapter describes the physical characteristics and PCB layout of the EVM
and lists the components used on the module.
Topic Page
2.1 PCB Layout 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Parts List 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

PCB Layout
2-2
2.1 PCB Layout
The EVM is constructed on a 4-layer, 3.3-inch ×5.75-inch, 0.062-inch thick
PCB using FR-4 material. Figure 2−1 through Figure 2−4 show the PCB layout
for the EVM.
Figure 2−1.Top Layer 1

PCB Layout
2-3
PCB Layout and Parts List
Figure 2−2.Layer 2, Ground Plane
Figure 2−3.Layer 3, Power Plane

PCB Layout
2-4
Figure 2−4.Bottom Layer

Parts List
2-5
PCB Layout and Parts List
2.2 Parts List
Table 2−1 lists the parts used in constructing the EVM.
Table 2−1.DAC5674 EVM Parts List
Ref. Des.
Description Qty. Part Number Mfg. Installed Not Installed
22-pF, 50-V, 5% capacitor 0 06035A220JAT2A AVX C20, C21
100-pF, 50-V, 5% capacitor 1 ECU-V1H101JCG Panasonic C23
0.01-µF, 16-V, 10% capacitor 2 06035A103KAT2A AVX C24, C52 C25, C55, C56
0.01-µF, 100-V, 5% capacitor 4 08055C103KAT2A AVX C42−C45
0.1-µF, 16-V, 10% capacitor 17 08055C104JAT2A AVX C1 −C7, C10,
C14, C15,
C17−C19, C22,
C27, C57, C58
0.1-µF, 100-V, 10% capacitor 4 ECJ-2VB1C104K Panasonic C38−C41
1-µF, 16-V, 10% capacitor 4 ECJ-3YB1C105K Panasonic C34−C37
10-µF, 10-V, 10% capacitor 4 GRM42X5R106K10 Murata C30−C33
47-µF, 10-V, 10%, tantalum
capacitor 4 10TPA47M Sanyo C46−C49
DAC5674 1 DAC5674IDW TI U1
Ferrite bead 4 D01608C-472 Coil Craft FB1−FB4
3POS header 4 TSW-150-07-L-S Samtec W2−W5
40-pin header 1 TSW-120-07-L-D Samtec J8
Red banana jacks 4 ST-351A Allied J9, J10, J12,
J14
Black banana jacks 4 ST-351B Allied J11, J13, J15,
J16
Green LED 5 LN1351C-(TR) Panasonic D1−D5
0-Ω, 1/16-W, 1% resistor 1 ERJ-3EKF0R00V Panasonic R6 R5, R7−R10,
R34, R36
10-Ω, 1/16-W, 1% resistor 1 ERJ-3EKF10R0 Panasonic R32
49.9-Ω, 1/16-W, 1% resistor 6 ERJ-3EKF49R9V Panasonic R3, R4,
R24−R27
100-Ω, 1/8-W, 1% resistor 1 ERA-3YEB100 Panasonic R2
200-Ω, 1/10-W, 1% resistor 5 ERJ-6ENF2000 Panasonic R19−R23
200-Ω, 1/16-W, 0.1% resistor 2 ERA-3YEB200 Panasonic R11, R12
1-kΩ, 1/8-W, 1% resistor 0 ERJ-3EKF1001 Panasonic R35, R37
1-kΩ, 1/8-W, 1% resistor 5 ERJ-6ENF1001 Panasonic R14−R18
2-kΩ, 1/16-W, 1% resistor 1 ERJ-6ENF2001 Panasonic R1
10K-kΩ, 1/8-W, 1% resistor 2 ERJ-3EKF1002 Panasonic R13, R33
22-Ωresistor pack 2 4816P-001-220 Bourns RP1, RP2
51-Ωresistor pack 2 770-101-R51 CTS RP4, RP6 RP7, RP8

Parts List
2-6
Table 2−1.DAC5674 EVM Parts List (Continued)
Ref. Des.
Description Qty. Part Number Mfg. Installed Not Installed
SW-PB switch 1 EVQ-PJX04M Panasonic S1
Switch 1 SD05HOSK CK S2
SMA connectors 3 713-4339
(901-144-8RFX) Allied J2, J4, J7 J1, J3, J5, J6
SN74LVC04A 1 SN74LVC04APW TI U2
Standoff, hex (1/4 ×1”) 4 219-2063 Allied
Black test point 3 5001K Keystone TP3, TP4, TP5
Red test point 3 5000K Keystone TP1, TP2, TP6
Transformer 1 T1-1T-KK8 Mini-Circuits T1
Transformer 1 TCM4-1 Mini-Circuits T2

3-1
Circuit Description
Circuit Description
This chapter provides descriptions of the primary functional circuits on the
DAC5674 EVM.
Topic Page
3.1 Circuit Function 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3

Circuit Function
3-2
3.1 Circuit Function
The following paragraphs describe the EVM circuits.
3.1.1 Input Clock
The DAC5674 EVM default operation setting is with a differential input clock
sent to the DAC5674. A 500-mV p-p, 0-V offset, 50% duty-cycle external
sinewave is applied to SMA connector J4 and converted to a differential clock
input to the DAC5674 by transformer T2. This input represents a 50-Ω load to
the source. In order to preserve the specified performance of the DAC5674
converter, the clock source should feature very low jitter. Using a clock with a
50% duty cycle gives optimum dynamic performance.
3.1.1.1 Differential ECL/PECL Input Clock
The EVM can be configured for differential ECL/PECL input clock mode by
configuring the board per Table 3−1 and applying the appropriate ECL/PECL
common mode voltage at terminal E1 (VTT). Use J3 and J5 to input the
external differential ECL/PECL clock signals.
3.1.1.2 Single-Ended Input Clock
The EVM can be configured for single-ended input clock mode by configuring
the board per Table 3−1. SMA connector J3 or header J8 can be used to input
the external TTL/CMOS clock signal.
Table 3−1.EVM Clock Configuration
Clock Configuration Components Installed†Components Not Installed
Sinewave (Default) R12, T2, C52 R9, R10, R34, R35, R36, R37,
C55, C56
ECL or PECL R9 (0.01-µF cap.), R10 (0.01-µF
cap.) R36, R12, R34, R35, R37, T2, C55, C56
Single ended TTL/CMOS from J3 R9, C55 R10, R12, R25, R34, R35, R37,
T2, C56
Single ended TTL/CMOS from J8 R34, R37, C55 R9, R10, R12, R35, T2, C56
†All component values are per the schematic except where shown in parentheses.
3.1.2 Input Data
The DAC5674 EVM can accept 3.3-V CMOS logic level data inputs through
the 40-pin header J8 per Table 3−2. The board provides 50-Ωtermination to
ground and series dampening resistors to minimize digital ringing and
switching noise. J8 also provides a path for an input clock (see Table 3−1 for
proper board configuration).

Circuit Function
3-3
Circuit Description
Table 3−2.Input Connector J8
J8 Pin Description J8 Pin Description J8 Pin Description
1CMOS data bit 13 (MSB) 15 CMOS data bit 6 29 Reset
2 GND 16 GND 30 GND
3CMOS data bit 12 17 CMOS data bit 5 31
4 GND 18 GND 32 GND
5CMOS data bit 11 19 CMOS data bit 4 33
6 GND 20 GND 34 GND
7CMOS data bit 10 21 CMOS data bit 3 35
8 GND 22 GND 36 GND
9CMOS data bit 9 23 CMOS data bit 2 37
10 GND 24 GND 38 GND
11 CMOS data bit 8 25 CMOS data bit 1 39 SCLK_IN
12 GND 26 GND 40 GND
13 CMOS data bit 7 27 CMOS data bit 0 (LSB)
14 GND 28 GND
3.1.3 Output Data
The DAC5674 EVM can be configured to drive a doubly terminated 50-Ωcable
or provide unbuffered differential outputs.
3.1.3.1 Transformer Coupled Signal Output
The factory-set configuration of the demonstration board provides the user
with a single-ended output signal at SMA connector J7. The DAC5674 is
configured to drive a doubly terminated 50-Ωcable using a 1:1 impedance
ratio transformer, a 100-Ωterminating resistor R2, and the center tap of T1
connected to ground per Table 3−3. When using a 4:1 impedance ratio
transformer, configure the EVM per Table 3−3. The common mode input
voltage of T1 can be adjusted by using the resistor divider network R5 and R6.
Table 3−3.Transformer Output Configuration
Configuration Components Installed†Components Not Installed
1:1 Impedance ratio transfomer R2, R3, R4, R6, C22, T1 (1:1) R5, R7, R8, C20, C21
4:1 Impedance ratio transfomer R3 (100), R4 (100), R6, C22,
T1 (4:1) R2, R5, R7, R8, C20, C21
†All component values are per the schematic except where shown in parenthesis.
3.1.3.2 Unbuffered Differential Output
To provide unbuffered differential outputs, the EVM must be configured as
follows: remove R2, C20, C21, and T1; Install R3, R4, R7, R8, J1 and J6.

Circuit Function
3-4
3.1.4 Internal Reference Operation
The full-scale output current is set by applying an external resistor (R1)
between the BIASJ pin of the DAC5674 and ground. The full-scale output
current can be adjusted from 20 mA down to 2 mA by varying R1 or changing
the externally applied reference voltage. The full-scale output current,
IOUTFS, is defined as follows:
IOUTFS = 32 ×(VEXTIO/R1)
where VEXTIO is the voltage at pin EXTIO. This voltage is 1.2 V typical when
using the internally provided bandgap reference voltage source.
3.1.5 External Reference Operation
The internal reference can be disabled and overridden by an external
reference by connecting a voltage source to terminal TP2 (EXT_I/O) and
connecting EXTLO to AVDD. The specified range for external reference
voltages should be observed (see the DAC5674 data sheet (SLWS148) for
details).
3.1.6 Sleep Mode
The DAC5674 EVM provides a means of placing the DAC5674 into a
power-down mode. This mode is activated by placing jumper W3 between pins
2 and 3.
3.1.7 Filter Control
The DAC5674 has two inputs, HP1 and HP2, which control the internal
interpolation filters (FIR1 and FIR2) mode of operation. When these inputs are
set to a logic high, the filters are configured for high-pass response. When set
to a logic low, the filters are configured for low-pass response. A third input,
X4, allows the user to bypass Interpolation Filter 1. When X4 is set to a logic
low, Filter 1 is bypassed. See the data sheet (SLWS148) for more information.
3.1.8 PLL Divider Control
The DAC5674 has two inputs, DIV0 and DIV1, which control the internal PLL
prescaler divide ratio setting. These two signals, along with the three filter
control signals, are all controlled by DIP switch S2 on the EVM. All control
signals are in the logic low level when the DIP switch is in the closed position.
See the data sheet (SLWS148) for more information.