Texas Instruments THS1030/31EVM User manual

THS1030/31EVM Evaluation
Module for the
THS1030/THS1031 10ĆBit
ADC
2000 AAP Data Conversion
User’s Guide
SLAU040

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How to Use This Manual
iii
Read This First
Preface
Read This First
About This Manual
This manual describes the physical characteristics, functions, modes of op-
eration, and configuration of the THS1030/31EVM evaluation module (EVM).
How to Use This Manual
- Chapter 1 – Overview
- Chapter 2 – Physical Description
- Chapter 3 – Circuit Description
- Chapter 4 – Modes of Operation

iv

Running Title—Attribute Reference
v
Chapter Title—Attribute Reference
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 THS1030/31EVM Operational Procedure 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Physical Description 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 PCB Layout 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Parts LIst 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Circuit Description 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Schematic Diagram 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Circuit Function 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.1 Inputs 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.2 Clock Options 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.3 References 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.4 Power 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.5 Outputs 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.6 THS1031 Register Write 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Modes of Operation 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running Title—Attribute Reference
vi
Figures
2–1 Silk Top 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Silk Bottom 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 Top 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–4 Inner 1 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–5 Inner 2 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–6 Bottom 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1 EVM Schematic Diagram 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–2 EVM Schematic Diagram – DIPS 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–3 EVM Schematic Diagram – LOGIC 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–4 EVM Schematic Diagram – THS1031 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–5 EVM Schematic Diagram – POWER_&_REF 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–1 Common Mode Input VREF/2 – 1Vp-p Input Span (top/bottom mode) 4-2. . . . . . . . . . . . . . . .
4–2 Common Mode Input VREF/2 – 2Vp-p Input Span (top/bottom mode) 4-2. . . . . . . . . . . . . . . .
4–3 External Common Mode Input – 1Vp-p Input Span (center span mode) 4-3. . . . . . . . . . . . . .
4–4 External Common Mode Input – 2Vp-p Input Span (center span mode) 4-3. . . . . . . . . . . . . .
4–5 Differential Input – 1Vp-p Input Span (differential input mode) 4-4. . . . . . . . . . . . . . . . . . . . . . .
4–6 Differential Input – 2Vp-p Input Span (differential input mode) 4-4. . . . . . . . . . . . . . . . . . . . . . .
4–7 External Reference – Input Span and Bias Set by on Board Reference Circuit
(potentiometer P2 sets EXT_T, potentiometer P3 sets EXT_B) 4-5. . . . . . . . . . . . . . . .

Running Title—Attribute Reference
vii
Contents
Tables
2–1 Parts List 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1 Output Connector J4 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–1 Board Jumper Settings for Various Modes of Operation 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–2 Jumper Settings for Clock Options 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

viii

1-1
Overview
Overview
This chapter gives a general overview of the THS1030/31EVM evaluation
module (EVM), and describes some of the factors that must be considered in
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 THS1030/31 Operational Procedure 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Purpose
1-2
1.1 Purpose
The THS1030/31EVM evaluation module (EVM) provides a platform for
evaluation of the THS1030 and THS1031 10-bit analog-to-digital converters
(ADC) under various signal, reference, and supply conditions. Unless stated
explicitly, the functionality described in this user’s guide applies to both
THS1030 and THS1031 devices.
1.2 EVM Basic Functions
Analog input to the THS1030/31 is provided via an external SMA connector.
The input can be configured onboard to be ac, dc, or transformer coupled to
the input of the device.
An external SMA connector is provided on the THS1031 for the clamp input.
This allows external digital control of the ADC’s clamping function. The ADC
can be clamped to either the device reference or to ground via an onboard
jumper.
The EVM provides an external SMA connection for ADC clock input. This can
be configured to be either ac or dc coupled. Space is reserved on the board
for a crystal oscillator to perform this function, and can be populated when re-
quired.
In addition to the internal reference from the THS1030/31 device, options are
providedontheEVMtoallowadjustmentoftheADCreferenceviaanonboard
reference circuit.
Output from the EVM is via a 40-pin header connector. The digital lines from
the THS1030/31 are buffered using the SN74LVCC4245A before going to the
header.ThisallowstheTHS1030/31suppliestobevariedwithoutaffectingthe
output signal levels.
Power connections to the EVM are via 4-mm banana sockets. Separate input
connectors are provided for the analog and digital supply to the device, and
for the reference and output buffer circuits.
The THS1031 has a number of programmable registers that can be pro-
grammed using DIL switches on the EVM.
1.3 Power Requirements
TheEVMhas4dc-powersupplyconnections:5Vfortheoutputbuffers,2.7 V
to 5 V for the analog and digital supplies to the ADC, and 2.7 V to 5 V for the
referencecircuit.Eachofthesesuppliesisindependent,butitshouldbenoted
thattheinputthresholdsoftheADCwillvarydependentonthedigitalandana-
log supply voltages, as per the datasheet specification.

THS1030/31EVM Operational Procedure
1-3
Overview
Voltage Limits
Exceeding the 5-V maximum can damage EVM components.
Undervoltage may cause improper operation of some or all of the
EVM components.
1.4 THS1030/31EVM Operational Procedure
The THS1030/31EVM provides a flexible means of evaluating the THS1030
and THS1031 in a number of modes of operation. These are described more
fullyinchapter4.Thefollowingbasicsetupprocedurecanbeusedasaboard-
confidence check:
- Verify all jumper settings against the following schematic jumper table:
Device Jumper Table (connection)
THS1030 H1 pin 2–3, H2 pin 2–3, H3 pin 1–2, H4 pin 2–3, H6 pin 1–2, H8 pin 1–2,
H9 pin 1–2, H10 pin 1–2, H11 pin 1–2, LINK4, LINK6, LINK10, LINK11,
LINK12, LINK13, LINK14, LINK16.
THS1031 H1 pin 2–3, H2 pin 2–3, H3 pin 1–2, H4 pin 2–3, H6 pin 1–2, H8 pin 2–3,
H9 pin 1–2, H10 pin 1–2, H11 pin 2–3, LINK4, LINK6, LINK10, LINK11,
LINK12, LINK13, LINK14, LINK16.
- Check that T1 is unpopulated.
- Connect supplies to the EVM: 5 V on J9, J6, J7, and J8; GND on J10 and
J11.
- Switch power supplies on.
- Use a DVM to monitor the voltage from TP24 to TP21. Use a
potentiometer adjusting tool to adjust P2 such that the DVM reads 2.5 V.
- Use a DVM to monitor the voltage from TP26 to TP21. Use a
potentiometer adjusting tool to adjust P3 such that the DVM reads 0.5 V.
- Useafunctiongeneratorwith50-Ωoutputtoinputa10-MHz,2.5-Voffset,
5-Vp–p amplitude signal into J2.
- Use a function generator with 50-Ωoutput to input a 50-kHz, 1.5-V offset,
1.5-Vp-p amplitude signal into J3.
- The digital pattern on the output header J4 should now represent a sine
wave, and can be monitored using a logic analyzer.

1-4

2-1
Physical Description
Physical Description
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Parts List 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

PCB Layout
2-2
2.1 PCB Layout
The EVM is constructed on a 4-layer, 151-mm (5.94 I ) ×115-mm (4.54 I ),
1.57-mm (0.062 I ) thick PCB using FR-4 material. Figures 2–1 through 2–6
show the individual layers.
Figure 2–1.Silk Top

PCB Layout
2-3
Physical Description
Figure 2–2.Silk Bottom

PCB Layout
2-4
Figure 2–3.Top

PCB Layout
2-5
Physical Description
Figure 2–4.Inner 1

PCB Layout
2-6
Figure 2–5.Inner 2

PCB Layout
2-7
Physical Description
Figure 2–6.Bottom

Parts LIst
2-8
2.2 Parts LIst
Table 2–1 lists the parts used in constructing the EVM.
Table 2–1.Parts List
Qty Reference Description Description Manufacturer Part Number
1 D1 LT1004-1.2 voltage reference TI LT1004CD-1-2
1 U4 SN74AHC14D hex inverter TI SN74AHC14D
4U6 U8 U9 U10 SN74LVCC4245ADW bus transceiver TI SN74LVCC4245AD
W
1 U7 TLV2464CD quad opamp TI TLV2464CD
1 U11 CMOS Dil 14 oscillator, 4-MHz IQD IQXO-100C 4MHz
1 SW1 6x6 mm flat push-button switch Omron B3F1000
6TP5, TP6, TP19, TP20, TP21,
TP22 1.32-mm test pin, black W Hughes 100-103
18 TP2, TP3, TP4, TP7, TP8,
TP9, TP10, TP11, TP12, TP14,
TP15, TP16, TP17, TP18,
TP23, TP24, TP25, TP26
1.32-mm test pin, red W Hughes 100-107
1 TP1 1.32-mm test pin, green W Hughes 100-108
1 SW3 0.1 I spacing TH 8 way Dil switch Multicomp MCDS08
3J2, J3, J5 SMB connector vertical PCB MACOM B65N07G999X
1 P1 2-kΩ3296Y potentiometer Bourns 3296Y-001-202
2P2, P3 10-kΩpotentiometer Bourns 3296Y-001-106
6J6, J7, J8, J9, J10, J11 4-mm panel socket Hirschmann BO10
1 C38 470-pF 0805 SMD ceramic capacitor
NPO AVX 08051A471JAT00J
16 LNK1, LNK2, LNK3, LNK4,
LNK5, LNK6, LNK7, LNK8,
LNK9, LNK10, LNK11, LNK12,
LNK13, LNK14, LNK15,
LNK16
0.1 I spacing 1X2 header Harwin M20-9990206
11 H1, H2, H3, H4, H5, H6, H7,
H8, H9, H10, H11 0.1
I spacing 1X3 header straight Harwin M20-9990306
1 SW4 0.1 I spacing TH 10 way Dil switch Multicomp DS10
3R7, R10, R59 51R 0805 thick-film resistor 5% Multicomp CR10510JT
1 R74 2K 0805 thick-film resistor 1% Multicomp CR10202JT
3R8, R9, R16 5K1 0805 thick-film resistor 5% Multicomp CR10512JT
1 R55 11K 0805 thick-film resistor 5% Multicomp CR10113JT
4L1, L2, L3, L4 0R 1206 thick-film resistor Multicomp CR8XXXJTZ32