CML EV0171 Evaluation kit user manual Datasheet

EV0171
Evaluation Kit
User Manual
UM0171/2 May 1999
1.0
Advance Information
Features
• CMX017 Product Demonstration
•
Simple and Easy to Use Controls
• 860 - 935 MHz Operation
•
Single 6 - 12 V Power Supply
• Direct FM/FSK Modulation
•
Powersave and Zero-Power Modes
• Adjustable Output Power up to +20dBm
•
Optional access to PAIN and
MODOUT
1.1
Brief Description
The EV0171 Evaluation Kit comprises a single board containing the CMX017 UHF FM/FSK transmitter,
frequency and gain potentiometers, VCO tank circuitry and miniature control switches.
A multi-turn potentiometer allows the user to select an RF operating frequency between 860 - 935 MHz. The
operating bandwidth and centre frequency can be optimised by modifying the VCO tank components.
The board is powered from a single 6 - 12 V dc power supply. Regulation circuitry sets the analog (AVDD)
supply for 3V operation. CMX017 supply currents may be measured by removing appropriate jumpers.
A low profile 2-way DIL switch controls the device enable lines, to obtain CMX017 powersave and zero-power
modes.
Links, test points and an SMA connector provide access to various points in the circuit.
 1999 Consumer Microcircuits Limited
Evaluation Kit User Manual for CMX017
EV0171
CONTENTS
Section
Page
1.0 Features .......................................................................................................... 1
1.1 Brief Description ............................................................................................ 1
1.2 Preliminary Information ................................................................................. 4
1.2.1 Laboratory Equipment................................................................... 4
1.2.2 Handling Precautions .................................................................... 4
1.2.3 Approvals........................................................................................ 4
1.3 Quick Start ...................................................................................................... 5
1.3.1 Setting-Up ....................................................................................... 5
1.3.2 Adjustments ................................................................................... 5
1.4 Signal Lists ..................................................................................................... 6
1.5 Circuit Schematics and Board Layouts ....................................................... 8
1.6 Detailed Description .................................................................................... 12
1.6.1 Hardware Description .................................................................. 12
1.6.2 Adjustments and Controls .......................................................... 13
1.6.3 PCB Design................................................................................... 14
1.7 Performance Specification .......................................................................... 15
1.7.1 Electrical Performance ................................................................ 15
Note: This product is in development: Changes and additions will be made to this
specification. Items marked TBD or left blank will be included in later issues.
Information in this data sheet should not be relied upon for final product design.
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EV0171
Figure 1 Block Diagram
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1.2
Preliminary Information
1.2.1
Laboratory Equipment
EV0171
The following laboratory equipment is needed to use this evaluation kit:
1.2.1.1 6 - 12 V dc Power Supply
1.2.1.2 Radio Communications Test Set or similar
1.2.1.3 Modulation source
1.2.2
Handling Precautions
Like most evaluation kits, this product is designed for use in office and laboratory environments. The
following practices will help ensure its proper operation.
1.2.2.1 Static Protection
This product uses low power CMOS circuits which can be damaged by electrostatic discharge.
Partially damaged circuits can function erroneously, leading to misleading results. Observe ESD
precautions at all times when handling this product.
1.2.2.2 Contents - Unpacking
Please ensure that you have received all of the items on the separate information sheet (EK0171) and
notify CML within 7 working days if the delivery is incomplete.
1.2.3
Approvals
This Evaluation Kit is capable of producing radio frequency emissions. Users are advised to
observe local statutory requirements which may apply to this product.
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1.3
EV0171
Quick Start
This section provides instructions for users who wish to experiment immediately with the evaluation kit.
A fuller description of the kit and its use appears later in this document.
1.3.1
Setting-Up
The EV0171 comes pre-configured for an RF operating frequency of 860MHz. The output power
at PAOUT, J1, is set to approximately 100mW when terminated with 50Ω.
Using suitable coaxial cable and adapters, connect PAOUT, J1, to the 50Ω input of a Radio
Communications test set, or similar. Ensure this input can accept power levels > +20dBm without
damage. Use an appropriate 50Ω inline attenuator if necessary.
Connect MODIN, TP1, to the output of a modulation (FM or FSK) source. Ensure the signal level does
not exceed the maximum level specified in device datasheet.
Select the required RF operating frequency (860 - 935 MHz) by setting the frequency potentiometer,
RV2.
Apply power to the input supply connector, J2, from a suitable 6 - 12 V dc power supply.
Operate switches SW1:1 and SW1:2 to enable the PA stage and modulator respectively.
To minimise the regulator (U2) power dissipation whilst operating for long periods with maximum gain,
it is recommended that the input voltage, VIN, is kept below 9V.
1.3.2
Adjustments
To adjust the gain of the CMX017 PA driver slowly turn the trimmer potentiometer, RV1. Using RV1,
the power level at PAOUT can be adjusted by typically 20dB.
A new RF operating frequency can be obtained by adjusting the trimmer potentiometer, RV2.
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1.4
EV0171
Signal Lists
CONNECTOR PINOUT
Connector
Ref.
Connector
Pin No.
Signal
Name
Signal
Type
Description
J1
1
PAOUT
O/P
CMX017 PA Output
J2
1
VIN
Power
+ve power from external power supply
2
VSS
Power
0V power from external power supply
1
PAIN or MODOUT
BI
CMX017 PA Input or Modulator Output
J3
TEST POINTS
Test Point
Ref.
Default
Measurement
Description
TP1
-
CMX017 Modulator Input
TP2
0V
VSS connection
TP3
3V
AVDD connection
TP4
0V
VSS connection
TP5
0V
VSS connection
TP6
0V
VSS connection
TP7
0V
VSS connection
TP8
-
CMX017 Buffered Oscillator Output
TP9
-
Frequency Control Voltage
JUMPERS
Link
Ref.
Positions
Default
Position
Description
JP1
1-2
S/C
Disconnect to measure AVDD3 current
JP2
1-2
S/C
Disconnect to measure AVDD2 current
JP3
1-2
S/C
Disconnect to measure AVDD1 current
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EV0171
ADJUSTMENTS
Adjustment
Ref.
Adjustment
Adjustment
Range
Description
RV1
Gain
0 - 3V
CMX017 PA Driver Gain
RV2
Frequency
0 - 3V
RF Operating Frequency Control
SWITCHES
Switch
Ref.
Positions
Default
Position
Description
SW1:1
on/off
on
CMX017 PA Enable
SW1:2
on/off
on
CMX017 Modulator Enable
Notes: I/P =
O/P =
BI
=
Input
Output
Bidirectional
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PAOUT
J1
L1
4.7uF(10V)
C2
100pF
3.3pF
C5
AVDD1
3.3nH
L2
C6
100pF
100pF
C7
C11
100pF
C9
RV1
1.2nH
100pF
20k
GND
ENLPA
VCC4
GND10
GND9
PAOUT
GND8
GND7
IPAOUT
GND6
GND5
GND4
GAIN
VCC3
PA
Enable
14
13
12
11
10
9
8
7
6
5
4
3
2
1
SW1:1
CMX017D6
U1
AVDD2
100pF
100nH
C1
L3
4.7uF(10V)
C4
C12
15
16
17
18
19
20
21
22
23
24
25
26
27
28
AVDD2
GND
ENLMOD
GND
MODIN
OSCGND
TANK
GND1
VCC1
OSCOUT
VCC2
GND2
MODOUT
GND3
PAIN
C13
SW1:2
C14
MOD
Enable
C31
C16
C15
10pF
C18
C17
100pF
100pF
22nH
L8
C32
TP2
TP1
MODIN
15pF
C19
TP8
OSCOUT
PA and IPA
Modulator and PA Driver
CMX017 OSCOUT signal can
be routed to TP8 by fitting C32.
C20
D1
AVDD1
C3
100nH
C8
L4
C10
L5
22nH
100pF
100pF
JP3
JP2
JP1
1
1
1
R11
4k7
C26
4.7uF(10V)
TP4
VSS
TP9
RV2
Frequency
Control
AVDD2
2
2
R7
C24
100nH
L9
AVDD1
AVDD2
2
10k
Baseband
Modulation Input
C22
C23
L6
R5
R6
100nH
PR1
4.7uF(10V)
Not Fitted
10k
100R
1
SIG
GND
2
C21
SMV1233-011
L7
3
20k
100pF
TP5
VSS
270R
U2
VI
TP6
VSS
TP7
VSS
47R
C28
R9
TO-220
3
1uF(16V)
VO
330R
R10
R8
2
LM317T
+3V Analog Supply
AVDD
AVDD3
TP3
K
D2
1N4001
A
J2
Input Voltage
6V to 12V
1
PAIN or MODOUT
R1
4
1
R2
1k
100k
100pF
1k
2
R3
R4
C25
A
AVDD3
C27
J3
TXRESRG405
8
100k
100uF(10V)
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1
Frequency Control
2
1.5
C30
100nF(16V)
Signal can be routed to
the PA input or from the
modulator output by
modifying components
L7, C14, C15 and C31.
Evaluation Kit User Manual for CMX017
EV0171
Circuit Schematics and Board Layouts
Figure 2 Evaluation Board - Circuit Schematic
UM0171/2
22uF(25V)
C29
100pF
Evaluation Kit User Manual for CMX017
EV0171
PAIN or MODOUT
J3
Board Mod
1 2 3 4
L6
C27
L7
C14
C17
2.70 IN
J2
VSS
C26
R8
C29
+
JP2
R4
R2
R11
VIN
R7
PR1
R3
MOD
Enable
PA
Enable
TP7
VSS
TP9
C24
C19
C13
R1
L3
C16
U1
CMX017D6
C23
D1
C28
+
C18
C21
C22
C12
C4
TP4
JP1
RV2
FREQUENCY
L5
L4
L2
C3
C10
C7
C25
C32
L9
C20
+
C2
TP8
L8
C30
C11
C5
C8
+
+
OSCOUT
C31
+
L1
C1
RV1
C15
GAIN
+
TP5
J1
PAOUT
5
TP6
C6
C9
JP3
SW1
R9 R10
R5
R6
TP1
TP2
D2
TP3
AVDD
MODIN
VSS
U2
2.70 IN
Note: Board material is FR4
Figure 3 Evaluation Board Layout - Assembly
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Figure 4 Evaluation Board Layout - Top Copper
Figure 5 Evaluation Board Layout - Layer Two Copper
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EV0171
Figure 6 Evaluation Board Layout - Layer Three Copper
Figure 7 Evaluation Board Layout - Bottom Copper
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1.6
EV0171
Detailed Description
The EV0171 Evaluation Kit comprises a single board containing the CMX017 UHF FM/FSK
transmitter, frequency and gain potentiometers, VCO tank circuitry and miniature control switches.
A multi turn potentiometer allows the user to select an RF operating frequency between 860935MHz. The operating bandwidth and centre frequency can be adjusted by simply modifying the
VCO tank components.
The board is powered from a single 6 - 12 V dc power supply. Regulation circuitry sets the
analog(AVDD) supply for 3V operation. CMX017 supply currents may be measured by removing
appropriate jumpers.
A low profile 2-way DIL switch controls the device enable lines, to obtain CMX017 powersave and
zero-power modes.
Links, test points and SMA connector provide access to various points in the circuit.
This open-loop configuration is not recommended for the majority of customer applications. A
closed-loop PLL design is required to improve controllability and overcome stability and drift
problems.
External PLL circuitry could be connected to test points TP8 (OSCOUT) and TP9 after removal of
RV2.
1.6.1
Hardware Description
1.6.1.1 Operating Voltage
The supply regulation circuitry contains a single regulator and associated components to provide the
analog supply (AVDD). The operating voltage is set to 3.0V.
The supply feed is split three ways to reduce interference and to enable the user to separately
measure various device/circuitry currents.
The supply regulation can be bypassed and external supplies applied, via jumpers JP1-JP3.
Note, due to the inductors dc resistance which is approximately 0.5Ω (100nH), small voltage drops will
occur across inductors L3 and L1.
1.6.1.2 Current Measurement
Supply currents for the evaluation device and other board circuitry can be measured by removing the
appropriate jumper and replacing it with a multimeter.
1.6.1.3 VCO Tank Circuitry
The tank resonator circuit is formed by two capacitors, C16 and C19, RG405 coaxial resonator, PR1,
and varacter diode, D1, which is driven by the frequency control potentiometer, RV2.
The dc control voltage derived from the frequency control potentiometer, RV2, can be measured at
TP9. Alternatively the potentiometer can be removed and control voltage applied to the VCO tank
circuitry via the test point TP9.
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1.6.1.4 FM/FSK Modulator
The modulation input, MODIN, TP1, is designed to be directly driven by a dc-coupled baseband input
signal, to generate a frequency modulated (FM or FSK) RF signal.
Please refer to the CMX017 device datasheet for specifications on maximum modulation
frequency/voltage at the device input (MODIN, pin 18).
The resistors R6 and R5 can be modified depending on the modulation source and required frequency
deviation.
The output impedance at the CMX017 MODOUT pin is typically 50Ω. Using microstrip techniques the
MODOUT track on the 4-layer PCB has been designed to provide a line impedance of 50Ω.
The CMX017 Modulator output signal can be routed to an SMA connector (not fitted), J3, by modifying
components C14, C15, C31 and L7.
1.6.1.5 Power Amplifier
The input/output impedances at the CMX017 PAIN/PAOUT pins are typically 50Ω. Using microstrip
techniques their tracks on the 4-layer PCB have been designed to provide line impedances of 50Ω.
Additional power gain improvement is achieved by employing the simple output matching network, C2,
C3 and L2.
Both amplifier output stages, IPAOUT and PAOUT, must have a dc connection to the supply rail
through RF chokes, L4 and L5.
The evaluation device can be used as a standalone UHF Power Amplifier by modifying components
C14, C15, C31 and L7. The RF signal should be input via an SMA connector (not fitted), J3.
1.6.2
Adjustments and Controls
1.6.2.1 Frequency Control
The trimmer potentiometer, RV2, controls the RF operating frequency. The control voltage derived (03V) from this potentiometer allows the RF operating frequency to be set between 860 - 935MHz. The
frequency control potentiometer draws a typical current of 150µA from the AVDD3 supply.
1.6.2.2 Gain Control
The trimmer potentiometer, RV1, controls the gain of the CMX017 PA driver. The output power, at the
MODOUT pin, is variable over a 20dB range. The output power is maximum when the CMX017 GAIN
pin is connected to 3V and is reduced by typically 20dB when this pin is connected to 0V.
The gain potentiometer draws a typical current of 150µA from the AVDD2 supply.
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1.6.2.3 Powersave and Zero-Power Modes
The evaluation device enable lines are controlled by switch SW1. This switch allows the user to
configure the CMX017 transmitter for powersave or zero-power.
The Modulator and Buffered Oscillator stages of the evaluation device can be powered down
independently of the PA Driver and Power Amplifier stages.
In SLEEP mode (SW1:1 and SW1:2 are Off) all sections of the device are powered down and the
device current consumption is reduced to typically 10µA. This is the zero-power mode.
In TRANSMIT-STANDBY mode (SW1:1 is Off and SW1:2 is On) only the PA Driver and Power
Amplifier stages are powered down, whilst the Modulator and Buffered Oscillator remain active.
In TRANSMIT mode (SW1:1 and SW1:2 are On) both the Modulator and Power Amplifier sections of
the device are fully operational.
1.6.2.4 VCO Tank Circuitry
The coaxial resonator, PR1, consists of a length of RG405 semi-rigid cable. The outer is cut to
approximately 0.370” (9.4mm). One end of the inner is soldered to the outer whilst the other is
soldered to the tank PCB Pad. The resonator is laid down and outer soldered to PCB ground points
using tinned wire. The overall length of the resonator is approximately 0.430” (11mm).
Reducing the length of the coaxial resonator will increase the resonant frequency and vice versa.
Increasing C16 and C19 will reduce resonant frequency.
The capacitance ratio of C19 to varactor diode, D1, will determine the achievable operating band for
the 0-3V control voltage. Therefore to reduce the bandwidth, reduce C19 and/or insert a small
picofarad capacitor, C22. The introduction of C22 will also reduce resonant frequency.
1.6.3
PCB Design
The EV0171 PCB is a 4-layer design, with an overall thickness of 0.062”, including top and bottom
layer copper. The top layer comprises the regulation circuitry connections, RF signal tracks and
CMX017 ground plane. The second layer is purely a ground plane for the supply. Layer three contains
The bottom layer
the analog power supply tracks, AVDD which feed all the board’s sub-circuits.
contains another ground plane for screening purposes.
CMX017 ground pins are connected directly to the top layer ground plane as close to the package as
possible. The power supply pins are bypassed to ground directly at the package using decoupling
capacitors with direct returns to ground.
Using microstrip techniques the PAOUT and PAIN/MODOUT tracks on the 4-layer PCB have been
designed to provide line impedances of 50Ω. This design technique is based on the track width and
separation distance between track and ground plane for a given dielectric constant of the PCB material.
The layout assumes the board material is FR4 with a ground plane on the second layer, separated
from the top layer by 0.016”. Therefore, for a dielectric constant between 4-5 and track widths of
0.032”, approximately 50Ω line impedances are obtained.
Refer to an RF/Microwave designer’s guide to obtain more information on microstrip line impedance
design.
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1.7
Performance Specification
1.7.1
Electrical Performance
EV0171
1.7.1.1 Absolute Maximum Ratings
Exceeding these maximum ratings can result in damage to the Evaluation Kit.
Notes
Supply (VIN - VSS)
Current into or out of VIN and VSS pins
Storage Temperature
Operating Temperature
Input Power to PAIN, J3 (not fitted)
Min.
-0.3
0
-10
+10
1
Max.
40.0
+1.5
+70
+35
+7
Units
V
A
°C
°C
dBm
1.7.1.2 Operating Limits
Correct operation of the Evaluation Kit outside these limits is not implied.
Notes
Supply (VIN - VSS)
Supply (AVDD - VSS)
Operating Temperature
Min.
6V
2.7V
+10
Max.
12V
3.3V
+35
Units
V
V
°C
1.7.1.3 Operating Characteristics
For the following conditions unless otherwise specified:
AVDD = 3.0V, Tamb = +25°C
RF = 860MHz, 50Ω load impedance.
Notes
DC Parameters
IDD (evaluation board - output power = + 20dBm)
IDD (evaluation board - PA and MOD disabled)
Notes:
2
3
Min.
Typ.
Max.
Units
135mA
5mA
1. With optional SMA connector fitted.
2. SW1:1 and SW1:2 are on
3. SW1:1 and SW1:2 are off.
Refer to current CML CMX017 data sheet for further information.
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EV0171
CML does not assume any responsibility for the use of any circuitry described. No IPR or circuit patent licences are implied. CML
reserves the right at any time without notice to change the said circuitry and this evaluation kit specification. Evaluation kits are
supplied for the sole purpose of demonstrating the operation of CML products and are supplied without warranty. They are intended
for use in a laboratory environment only and are not for re-sale, end-use or incorporation into other equipments. Operation of
evaluation kits outside a laboratory environment is not permitted within the European Community. All software is supplied "as is"
and is without warranty. It forms part of the evaluation kit and is licensed for use only in this kit, for the purpose of demonstrating the
operation of CML products. Whilst all reasonable efforts are made to ensure that software contained in this product is virus free,
CML accepts no responsibility whatsoever for any contamination which results from using this software and the onus for checking
that the software is virus free is placed on the purchaser of this evaluation kit.
1 WHEATON ROAD
WITHAM - ESSEX
CM8 3TD - ENGLAND
Telephone: +44 1376 513833
Telefax:
+44 1376 518247
e-mail:
[email protected]
http://www.cmlmicro.co.uk
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