Texas Instruments THS7002 User Manual

THS7002
ProgrammableĆGain Amplifier
Evaluation Module

User’s Guide

July 1999 Mixed-Signal Products

SLOU037

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Copyright  1999, Texas Instruments Incorporated

Related Documentation From Texas Instruments

J

THS7002 PROGRAMMABLE-GAIN AMPLIFIER

number SLOS214) This is the data sheet for the THS7002
amplifier integrated circuit used on the EVM.

J

THS4001 HIGH-SPEED LOW-POWER OPERATIONAL
AMPLIFIER

for the THS4001 amplifier integrated circuit used on the EVM.

J

PowerPAD Thermally Enhanced Package

SLMA002) This is the technical brief for the special PowerPAD
package in which the THS7002 amplifier IC is supplied.

(literature number SLOS206) This is the data sheet

FCC Warning

This equipment is intended for use in a laboratory test environment only. It
generates, uses, and can radiate radio frequency energy and has not been
tested for compliance with the limits of computing devices pursuant to subpart
J of part 15 of FCC rules, which are designed to provide reasonable protection
against radio frequency interference. Operation of this equipment in other
environments may cause interference with radio communications, in which
case the user at his own expense will be required to take whatever measures
may be required to correct this interference.

Preface

(literature

(literature number

Trademarks

TI is a trademark of Texas Instruments Incorporated.
PowerPAD is a trademark of Texas Instruments Incorporated.

Chapter Title—Attribute Reference

iii

iv

Running Title—Attribute Reference

Contents

1 General Information 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Description 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Programmable Gain Amplifier Gain Control 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 EVM DIP Switch Functionality 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 EVM Circuit Configuration 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 Using the THS7002 EVM 1-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.7 THS7002 EVM Performance 1-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.8 General High-Speed Amplifier Design Considerations 1-16. . . . . . . . . . . . . . . . . . . . . . . . . .

1.9 General PowerP ADt Design Considerations 1-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.10 THS7002 EVM Specifications 1-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Reference 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 THS7002 Programmable-Gain Amplifier EVM Parts List 2-2. . . . . . . . . . . . . . . . . . . . . . . . .

2.2 THS7002 EVM Board Layouts 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Title—Attribute Reference

v

Running Title—Attribute Reference

Figures

1–1 THS7002 Evaluation Module 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2 THS7002 EVM Power Conditioning Schematic Diagram 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–3 THS7002 EVM Schematic Diagram 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–4 Simplified PGA Section of the THS7002 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–5 THS7002 Evaluation Module Block Diagram 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–6 THS7002 EVM Preamplifier Frequency Response 1-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–7 THS7002 EVM Preamplifier Phase Response 1-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–8 THS7002 EVM PGA Frequency Response 1-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–9 THS7002 EVM PGA Phase Response 1-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–10 THS7002 EVM Preamplifier + PGA Frequency Response 1-15. . . . . . . . . . . . . . . . . . . . . . . . .

1–11 THS7002 EVM Preamplifier + PGA Phase Response 1-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–12 PowerPAD PCB Etch and Via Pattern 1-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–13 Maximum Power Dissipation vs Free-Air Temperature 1-18. . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 THS7002 EVM Component Placement Silkscreen and Solder Pads 2-3. . . . . . . . . . . . . . . . .

2–2 THS7002 EVM PC Board: Top Assembly 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 THS7002 EVM PC Board: Top Layer 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–4 THS7002 EVM PC Board: Bottom Layer 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

T ables

1–1 THS7002 EVM PGA Nominal Gain/Attenuation 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2 EVM DIP Switch Functionality 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–3 THS7002 EVM Jumper Settings 1-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–4 THS7002 EVM DIP Switch Settings 1-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 THS7002 Programmable-Gain Amplifier EVM Parts List 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .

vi

Chapter 1

General

Information

This chapter details the Texas Instruments (TI) THS7002
programmable-gain amplifier evaluation module (EVM), SLOP136. It includes
a list of EVM features, a brief description of the module illustrated with pictorial
and schematic diagrams, EVM specifications, details on configuring,
connecting, and using the EVM, and a discussion on high-speed amplifier and
PowerPAD package design considerations.

Topic Page

1.1 Features 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Description 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Programmable Gain Amplifier Gain Control 1–7. . . . . . . . . . . . . . . . . . . . .

1.4 EVM DIP Switch Functionality 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 EVM CIrcuit Configuration 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 Using The THS7002 EVM 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.7 THS7002 EVM Performance 1–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.8 General High-Speed Amplifier Design Considerations 1–16. . . . . . . . .

1.9 General PowerPAD Design Considerations 1–17. . . . . . . . . . . . . . . . . .

1.10 THS7002 EVM Specifications 1–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Information

1-1

Features

1.1 Features

1.2 Description

THS7002 programmable-gain amplifier EVM features include:

J

Multiple Input Configurations Set Via On-board Jumpers

J

DIP Switches Allow Quick and Easy Adjustment of Gain, Shut Down,
Reference Voltage, and Output Clamping

J

Includes a THS4001 High-Speed Amplifier as an Inverter

J

Standard BNC Connectors Inputs and Outputs

J

±5-V to ±15-V Operation with 5-V Reference Input

J

Nominal 50-Ω Impedance Inputs and Outputs

J

Includes T est Points for Easy Digital Control of EVM Circuit Gain and
Operating Parameters

J

Good Example of PowerPAD Package and High-Speed Amplifier
Design and Layout

The TI THS7002 programmable-gain amplifier evaluation module (EVM) is a
complete dual-channel low-noise receiver and a highly configurable
programmable-gain amplifier circuit. It consists of the TI THS7002
Programmable-Gain Amplifier IC, a TI THS4001 high-speed, low-power
operational amplifier IC, and a number of passive parts, all mounted on a
multilayer circuit board (Figure 1–1).

Although the THS7002 IC was developed primarily for xDSL receiver
front-ends, there are a large number of different circuits that can benefit from
the many features incorporated into the THS7002. This EVM illustrates a
universal design and can be used for numerous system configurations.

The EVM uses standard BNC connectors for inputs and outputs and also
includes test points for user connections and testing. It is completely
assembled, fully tested, and ready to use — just connect it to power, a signal
source, and a load (if desired).

1-2

General Information

Figure 1–1.THS7002 Evaluation Module

Description

SLOP136

Rev. B

J1

+V

CC

J2

Pre-Amp A
Output

J5

1998

Input A

Texas Instruments

Input B

J6

JP1

C6

R6

1

R8

R7

R1C1 R2

C2

U2

C3

R4

U2 Out

J7

R9

C11

C10

C12

R10

C9

R3

R12

JP2

1

R13

1

R14

R16

J8

B

GND

R18

R5

C8

R11

C13

C14

JP4JP3

1

BVREF

R17

Pre-Amp B
Output

THS7002 EVM Board

J4J3

+++

CC

C17

AG2

(3)

AG1

(2)

AG0

(1)

C7

R15

VH

BS/D

R20

(6)

(5)

(4)

R23
R25
R27

U1

R29

R11

R33

R35
R37
R39
R41

1

JP5

C18
C19

R24
R26
R28
R30
R32

R34
R36
R38
R40
R42

C20

+5 V–V

S1

PGA – A
Output

R44

PGA – B
Output

R45

S2

C21L2C5C4L1

GND

AS/D
(4)

AVREF
(5)

VL
(6)

BG2
(1)

BG1
(2)

BG0
(3)

J9

J10

Input power is applied to the EVM through banana jacks J1, J2, J3, and J4. An
LC filter on each power bus isolates the EVM circuits from the external supply
(Figure 1–2). J4 provides a reference point for numerous circuit functions and
draws relatively little current. The schematic for the EVM amplifiers appears
in Figure 1–3.

Figure 1–2.THS7002 EVM Power Conditioning Schematic Diagram

J1

V

CC

L1

0.22 µH

15 V

C4

6.8 µF

+

J2

GND

TP1

–V

C5

6.8 µF

+

J3

CC

–15 V

L2

0.22 µH

J4

5 V

C21

6.8 µF

+

5 V

General Information

1-3

Description

J10

PGA-B

R36, 3.3 kΩ

R38, 3.3 kΩ

R40, 3.3 kΩ

Output

5 V

C17, 0.1 µF

5 V15 V

R24, 3.3 kΩ

AG2, TP3

TP2, AG0

TP4, AG1

JP5

R26, 3.3 kΩ

R28, 3.3 kΩ

15 V

U1–D

R39, 330Ω

15

16

R37, 330Ω

17

R35, 330Ω

R11

C10, TBD

R10

TP12

U2-Out

R45

100 Ω

19

G0

G1

G2

12

R14

C14, TBD

1

499 Ω

499 Ω

R4

22 Ω

VO

VIN–

U1-C

R13

1

0 Ω

2

10

TBD

VREF

GND

SID

11

–

2

3

C9

JP3

2

13

14

18

C13

R12

9

TBD

TBD

JP4

+

TBD

3

R17

3

R15

R33

49.9 Ω

JP2

49.9 Ω

330 Ω

R34

J8

BVREF

TP14

3.3 kΩ

Pre-amp B

Output

R3

TBD

S2-E

S2-D

BS/D

5 V

TP13

Figure 1–3.THS7002 EVM Schematic Diagram

BG0, TP11

BG1, TP10

J9

PGA-A

Output

R44

R42

S2-F

R41

U1–B
26

27

28

21

C19, 0.1 µF

C6, TBD

1

100 Ω

4.7 kΩ

49.9 Ω

G2

G1

G0

R6

20

VH

VCC

0 Ω

24

3

2

VO

VIN–

JP1

R32

R31

23

VL

VREF

GND

SID

–Vcc

C7

TBD

R20

TBD

3

3

2

1

VH

TP5

R27, 330Ω

R25, 330Ω

R23, 330 Ω

BG2, TP9

5 V

C20, 0.1 µF

4.7 kΩ
S1-F

VL

TP6

49.9 Ω

R18

2

1

R29

25

22

C18, 0.1 µF

J5

Pre-amp

R5

49.9 Ω

–15 V

49.9 Ω

330 Ω

–15 V

A Out

AVREF

TP8

S2-C

S2-B

S2-A

R30

S1-E

S1-D

3.3 kΩ

AS/D

5 V

TP7

C8, TBD

15 V

R8

499 Ω

C12, 0.1 µF

R7

499 Ω

U1-A

THS7002

8

5

4

–

J6

1-4

+

6

Input A

R1

15 V

R2

1 kΩ

C3, 0.1 µF

1 kΩ

C1, TBD

C11

0.1 µF

7

–15 V

R9

49.9 Ω

U2

7

5

THS4001

–

2

C2, 0.1 µF

4

+

3

J7

–15 V

Input B

R16

49.9 Ω

General Information