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Table of Contents
User’s Guide
THS6222RHF Evaluation Module
ABSTRACT
This user's guide describes the characteristics, operation, and use of the THS6222RHFEVM. This evaluation
module (EVM) is an evaluation and development kit for evaluating the THS6222IRHF, a differential line-driver
amplifier with a current-feedback architecture that is targeted for use in broadband power line communications
(PLC) line driver applications. A complete circuit description as well as schematic diagram and bill of materials
are included in this document.
Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with the
THS6222RHFEVM.
Table of Contents
1 Introduction.............................................................................................................................................................................2
1.1 Features............................................................................................................................................................................. 2
1.2 EVM Specifications............................................................................................................................................................ 2
2 Power Connections................................................................................................................................................................ 2
2.1 Split-Supply Operation....................................................................................................................................................... 2
2.2 Single-Supply Operation.................................................................................................................................................... 2
3 Input and Output Connections.............................................................................................................................................. 3
3.1 Bias Mode Control Pins......................................................................................................................................................3
3.2 IREF Pin Connection..........................................................................................................................................................3
3.3 Optional VCM Pin Connection........................................................................................................................................... 3
4 Board Layout...........................................................................................................................................................................4
5 Schematic and Bill of Materials.............................................................................................................................................5
5.1 Schematic.......................................................................................................................................................................... 5
5.2 Bill of Materials...................................................................................................................................................................6
6 Related Documentation..........................................................................................................................................................8
7 Revision History......................................................................................................................................................................8
Trademarks
All trademarks are the property of their respective owners.
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Introduction
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1 Introduction
The THS6222RHFEVM is an evaluation module for the single THS6222 amplifier in the RHF package. This
evaluation module is designed to quickly and easily demonstrate the functionality and versatility of the amplifier.
The EVM is ready to connect to power, signal sources, and test instruments through the use of onboard
connectors. The EVM comes configured for easy connection with common 50-Ω laboratory equipment on its
inputs and outputs. The amplifier is configured for a differential input with a gain of 10 V/V to a differential output.
The board includes jumpers to easily switch the device between different bias modes and a potentiometer to
set the value of the IADJ pin. The EVM can be easily configured for other gains and for single- or split-supply
operation. The output transformer and resistors are configured to present a 50-Ω, single-ended output.
1.1 Features
•
•
•
•
Configured for split-supply operation and easily modified for single supply
Default gain of 10-V/V configuration can easily be reconfigured for other gains
Designed for easy connection to standard 50-Ω input/output impedance test equipment
Inputs and outputs include subminiature version A (SMA) connectors
1.2 EVM Specifications
Table 1-1 lists the typical performance specifications for the THS6222RHFEVM.
Table 1-1. THS6222RHFEVM Specifications
Specification
Typical Value Range
Split-supply voltage range
±4 V to ±26 V
Single-supply voltage range (VEE = ground)
8 V to 32 V
Quiescent current (no load, split supply, full-bias mode)
20.5 mA
Output voltage swing (VCC = 12 V, 100-Ω load)
19.6 VPP
Linear output current (VCC = 12 V, 25-Ω load)
355 mA
2 Power Connections
The THS6222RHFEVM is equipped with a wire socket for easy connection of power. The positive supply input
is labeled V+, the negative supply input is labeled V–, and ground (GND) is the unlabeled center terminal of the
power-supply connector.
For split-supply operation, populating R16 is required and is the default configuration when the board is received.
For single-supply operation, removing R16 is required for correct operation. This configuration is not default and
will require a board modification.
2.1 Split-Supply Operation
To operate as a split supply, apply the positive supply voltage to V+, the negative supply voltage to V–, and the
ground reference from supply to GND.
When operating with equal (balanced) split-supplies, the input common mode is held to GND by R16 on the
bottom of the THS6222RHFEVM PCB. This configuration is default and will be present upon opening the EVM
for the first time.
If operating with uneven supplies, the input common mode must be referenced to midsupply, V+/2. For uneven
supplies, this input common mode is not at GND potential. A board modification is required. Follow the steps in
Single-Supply Operation for implementing uneven supplies on the THS6222RHFEVM.
2.2 Single-Supply Operation
When operating the THS6222RHFEVM in a single-supply configuration, the input common mode must be
referenced to midsupply, V+/2. For single-supply operation, the input common mode is not at GND potential.
The THS6222 has an internal common mode buffer (see Section 7.1 of THS6222 datasheet); this buffer drives
the common mode voltage to midsupply without external circuitry. The input common mode voltage is at the
node between R1 & R2 in the THS6222RHFEVM schematic; this node is connected to TP1 as well as GND via
R16 by default.
2
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Input and Output Connections
To enable a input common mode of V+/2, a board modification is required. Please remove R16 from the bottom
side of the PCB: R16 holds the input common mode node, between R1 & R2, to GND. Setting the input common
mode to GND for a single supply configuration will not properly operate the amplifier; there will not be device
output on the THS6222RHFEVM if R16 is populated. The removal of R16 allows the internal common mode
buffer circuit to work as intended during single-supply operation.
After removing R16 from the rear of the PCB, follow these steps for single-supply opeartion:
• Connect both the V- connector and the GND connector to ground; apply the positive supply voltage to V+
• Optionally use TP1 (red) to confirm the input common mode is at V+/2
3 Input and Output Connections
The THS6222RHFEVM is equipped with SMA connectors for easy connection of signal generators and analysis
equipment. As shipped, the EVM is configured for a gain of 10-V/V, split-supply, differential input and output with
50-Ω termination. By default, the inputs INA and INB are configured for a differential input connection. To use
the device with a single-ended input, either use an external transformer or populate transformer T1 on the board,
remove R21, populate R15 with a 0-Ω resistor, and use INA as the single-ended input. OUTA (J5) is the output
connector for single-ended output signals. The output resistors R10 and R11 in combination with the transformer
(T2) on the amplifier output provide a 25-Ω load to the amplifier when terminated in 50 Ω differentially. To use
the EVM with a single-ended output, remove resistor R23 and populate resistor R18 with 0 Ω, which gives a
single-ended output on OUTA. The EVM contains provisions for additional output devices to change the loading
of the amplifier and to add protection devices. See the THS6222 data sheet applications section, schematics,
and layouts for more detail and how to reconfigure the EVM.
3.1 Bias Mode Control Pins
The amplifier bias modes can be controlled through shorting jumpers J1 and J2. By default, the jumper shorts
are left unconnected, which pulls the input signals low, leaving the device in its full-bias mode. Jumper J1
controls pin BIAS-1 and jumper J2 controls pin BIAS-2. In conjunction the jumpers can be used to place the
device in its three bias modes or in shutdown.
3.2 IREF Pin Connection
The fine current adjustment (IADJ) pin of the device is controlled using the potentiometer R17 on the board.
By default the potentiometer is set to 0 Ω, which yields the maximum quiescent current for each bias mode. By
increasing the resistance of the potentiometer, the quiescent current can be reduced to a desired lowered value
at the cost of reduced performance.
3.3 Optional VCM Pin Connection
The EVM includes an optional connection on the VCM (pin 5) of the device for a capacitor. The optional VCM
capacitor can be added to help filter common-mode noise if needed by the application. VCM is not populated by
default on the EVM.
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Board Layout
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4 Board Layout
The layer plots of Figure 4-1 to Figure 4-4 illustrate the board layers in top to bottom order.
4
Figure 4-1. Top Layer
Figure 4-2. Ground Layer
Figure 4-3. Power Layer
Figure 4-4. Bottom Layer
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Board Layout
5 Schematic and Bill of Materials
This section provides the schematic and bill of materials (BOM) for the THS6222RHFEVM.
5.1 Schematic
Figure 5-1 shows the EVM schematic.
1
2
3
4
5
6
A
A
L1
90 ohm
VCC
C1
2.2µF
50V
J7
1
2
3
C2
2.2µF
50V
C3
1nF
100V
GND
L2
90 ohm
TP4
GND
TP5
GND
GND
GND
C4
10nF
50V
VEE
TP2
OUT A
R12
49.9
B
J5
OUT A
0
C12
VCC
T1
100nF
25V
2
6
1
C6
TT1-6-KK81+
R8
1.24k
R1
24.9
TP1
3
5
GND
R16
100nF
25V
GND
R9
274
0
R2
24.9
GND
VS+
D1 OUT
20
1
19
D1 IN+
D1 FB
D2 OUT
17
2
18
D2 IN+
D2 FB
NC
NC
NC
NC
NC
NC
NC
10
11
12
13
14
15
16
23
24
R7
1.24k
Iadj
4
J4
IN B
R21
0
C10
100nF
25V
C13
100nF
25V
R15
0
2
3
4
5
1
0
GND
BIAS-1/D1D2
BIAS-2/D1D2
IADJ
5
VCM
6
7
9
8
NC
NC
NC
NC
C14
100nF
25V
R28
0
3
GND
D2
R11
24.9
GND
2
R10
24.9
1
D3
T2
4
3
C7
3
2
100nF
25V
VS-
22
3
PAD
25
3
5
2
6
GND
C8
100nF
25V
1
GND
TT1-6-KK81+
MMBZ27VCL-7-F
VEE
VEE
J6
OUT B
R26
0
C11
VEE
GND
B
1
VCC
D1
U1
21
2
VCC
GND
1
2
3
4
5
R19
0
C5
R14
R20
0
GND
4
100nF
25V
100nF
25V
5
4
3
2
C9
R24
0
R13
49.9
100nF
25V
R23
0
R18
0
1
5
4
3
2
0
1
R22
BAT54S-7-F
1
C
R25
0
R27
J3
IN A
GND
C
GND
OUT B
TP3
GND
GND
VCC
THS6222IRHF
GND
R3
10k
J1
2
1
3
CW
R4
10k
B1_AB
Bias Mode
J1 position
J2 position
IQ(typ)
Full
Open
Open
21 mA
Mid
Closed
Open
16 mA
Low
Open
Closed
11 mA
Shut-down
Closed
Closed
< 1mA
2
1
Typical Power Supply Current Reading for Different Bias Modes
GND
R17
3223W-1-103E
10k ohm
CCW
GND
VCC
R5
10k
J2
2
1
D
D
R6
10k
B2_AB
GND
Texas Instruments and/or its licensors do not warrant the accuracy or completeness of this specification or any information contained therein. Texas Instruments and/or its licensors do not
warrant that this design will meet the specifications, will be suitable for your application or fit for any particular purpose, or will operate in an implementation. Texas Instruments and/or its
licensors do not warrant that the design is production worthy. You should completely validate and test your design implementation to confirm the system functionality for your application.
1
2
3
4
Orderable: THS6222RHFEVM
TID #:
N/A
Number: AMPS083
Rev: E1
SVN Rev: Not in version control
Drawn By:
Engineer: Jacob Freet
5
Designed for: Public Release
Project Title: THS6222RHFEVM
Sheet Title:
Assembly Variant: 001
File: AMPS083E1.SchDoc
Contact: http://www.ti.com/support
Mod. Date: 7/30/2019
Sheet: 1 of 2
Size: B
http://www.ti.com
© Texas Instruments 2018
6
Figure 5-1. THS6222RHFEVM Schematic
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Board Layout
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5.2 Bill of Materials
Table 5-1 lists the EVM BOM.
Table 5-1. Bill of Materials
Designator
6
Qty
Value
Description
Part Number
Manufacturer
C1, C2
2
2.2 µF
805
C2012X7R1H225K125AC
TDK
C3
1
1000 pF CAP, CERM, 1000 pF, 100 V, ± 20%, X7R, 0603
603
CX0603MRX7R0BB102
Yageo America
C4
1
0.01 µF
CAP, CERM, 0.01 µF, 50 V, ± 10%, X7R, 0805
805
08055C103KAT2A
AVX
C9, C10
2
0.1 µF
CAP, CERM, 0.1 µF, 25 V, ± 5%, X7R, 0603
603
C0603C104J3RACTU
Kemet
H1, H2, H3, H4
4
Machine Screw, Round, #4-40 x 1/4, Nylon, Philips panhead
Screw
NY PMS 440 0025 PH
B&F Fastener
Supply
H5, H6, H7, H8
4
Standoff, Hex, 0.5"L #4-40 Nylon
Standoff
1902C
Keystone
J1, J2
2
Header, 100mil, 2x1, Gold, TH
Sullins 100mil, 1×2, 230
mil above insulator
PBC02SAAN
Sullins Connector
Solutions
J3, J4, J5, J6
4
Connector, End launch SMA, 50 Ω, SMT
SMA End Launch
142-0701-851
Cinch Connectivity
J7
1
Terminal Block, 5.08 mm, 3×1, Brass, TH
3×1 5.08 mm Terminal
Block
ED120/3DS
On-Shore
Technology
L1, L2
2
Ferrite Bead, 90 Ω at 100 MHz, 1.5 A, 1206
1206
MI1206K900R-10
Laird-Signal
Integrity Products
LBL1
1
Thermal Transfer Printable Labels, 0.650" W x 0.200" H - 10,000 PCB Label 0.650 × 0.200
per roll
inch
THT-14-423-10
Brady
R1, R2
2
24.9
RES, 24.9, 1%, 0.1 W, AEC-Q200 Grade 0, 0402
402
ERJ-2RKF24R9X
Panasonic
R3, R4, R5, R6
4
10 k
RES, 10 k, 5%, 0.1 W, 0603
603
RC1608J103CS
Samsung ElectroMechanics
R7, R8
2
1.24 k
RES, 1.24 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402
402
CRCW04021K24FKED
Vishay-Dale
R9
1
274
RES, 274, 1%, 0.063 W, AEC-Q200 Grade 0, 0402
402
CRCW0402274RFKED
Vishay-Dale
R10, R11
2
24.9
RES, 24.9, 1%, 0.1 W, 0603
603
RC0603FR-0724R9L
Yageo
R14, R23, R26, R27
4
0
RES, 0, 5%, 0.1 W, 0603
603
RC0603JR-070RL
Yageo
R16, R21, R22
3
0
RES, 0, 5%, 0.063 W, 0402
402
RC0402JR-070RL
Yageo America
R17
1
10 kΩ
TRIMMER 10k Ω 0.125W SMD
3.52 × 4.16 × 3.94 mm
3223W-1-103E
Bourns
T2
1
RF Transformer, 50 Ω, 0.004 to 300 MHz, SMT
7.62 × 6.86 mm
TT1-6-KK81+
Minicircuits
TP1
1
Test Point, Miniature, Red, TH
Red Miniature Testpoint
5000
Keystone
TP4, TP5
2
Test Point, Miniature, Black, TH
Black Miniature Testpoint
5001
Keystone
U1
1
THS6222IRHF, RHF0024A (VQFN-24)
RHF0024A
THS6222IRHF
Texas Instruments
C5, C6, C7, C8, C11,
C12, C13, C14
0
0.1 µF
CAP, CERM, 0.1 µF, 25 V, ± 5%, X7R, 0603
603
C0603C104J3RACTU
Kemet
D1
0
27 V
Diode, TVS, Uni, 27 V, 38 Vc, SOT-23
SOT-23
MMBZ27VCL-7-F
Diodes Inc.
D2, D3
0
30 V
Diode, Schottky, 30 V, 0.2 A, SOT-23
SOT-23
BAT54S-7-F
Diodes Inc.
90 Ω
CAP, CERM, 2.2 µF, 50 V, ± 10%, X7R, 0805
Package Reference
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Table 5-1. Bill of Materials (continued)
Designator
Qty
Value
Description
Package Reference
Part Number
Manufacturer
R12, R13
0
49.9
RES, 49.9, 1%, 0.063 W, AEC-Q200 Grade 0, 0402
402
CRCW040249R9FKED
Vishay-Dale
R15, R19
0
0
RES, 0, 5%, 0.063 W, 0402
402
RC0402JR-070RL
Yageo America
R18, R20, R24, R25,
R28
0
0
RES, 0, 5%, 0.1 W, 0603
603
RC0603JR-070RL
Yageo
T1
0
RF Transformer, 50 Ω, 0.004 to 300 MHz, SMT
7.62 × 6.86 mm
TT1-6-KK81+
Minicircuits
TP2, TP3
0
Test Point, Miniature, Red, TH
Red Miniature Testpoint
5000
Keystone
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Related Documentation
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6 Related Documentation
For related documentation, see the following:
•
Texas Instruments, THS6222 8 V to 32 V, Differential HPLC Line Driver with Common-Mode Buffer data
sheet
7 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision * (August 2019) to Revision A (April 2022)
Page
• Updated the numbering format for tables, figures, and cross-references throughout the document..................2
• Updated the Power Connections section............................................................................................................2
• Updated the Split-Supply Operation section.......................................................................................................2
• Updated the Single-Supply Operation section....................................................................................................2
8
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