XY components share many common features with standard multi-layer ceramic capacitors (MLCC) for easy adoption by end-users.
• Same component sizes (0603, 0805, 1206, etc.)
• Same pick and place equipment
• Same dielectric, electrode and termination materials
• Same industry test standards for component reliability
®
A standard multi-layer ceramic capacitor (MLCC) consists of opposing electrode layers A & B. The XY
®
design adds another set of electrode layers (G) which
effectively surround each existing electrode of a two-terminal capacitor. The only external difference is two additional side terminations, creating a four-terminal
capacitive circuit, which allows circuit designers a multitude of attachment options.
G1
B
A
G2
X2Y
®
Circuit 1: Filtering
When used in circuit 1 configuration the XY
®
filter capacitor is connected across two signal lines. Differential mode noise is filtered to ground by the two Y
capacitors, A & B. Common mode noise is cancelled within the device.
Signal 1
Ground
Signal
G1
A
G
B
Experts agree that balance is the key to a “quiet” circuit. XY® is a balanced circuit device with two equal
halves, tightly matched in both phase and magnitude with respect to ground. Several advantages are
gained by two balanced capacitors sharing a single ceramic component body.
• Exceptional common mode rejection
• Effects of aging & temperature are equal on both caps
• Effect of voltage variation eliminated
• Matched line-to-ground capacitance
InAmp Input Filter Example
In this example, a single Johanson XY
®
component was used to filter noise at the input of a DC
instrumentation amplifier. This reduced component count by 3-to-1 and costs by over 70% vs.
conventional filter components that included 1% film Y-capacitors.
Parameter
DC offset shift
Common mode rejection
X2Y
®
10nF
< 0.1 µV
91 dB
Discrete
10nF, 2 @ 220 pF
< 0.1 µV
9 dB
Comments
Referred to input
Source: Analog Devices, “A Designer’s Guide to Instrumentation Amplifiers (2nd Edition)” by Charles Kitchin and Lew Counts
Common Mode Choke Replacement
In this example, a 5 µH common mode choke is replaced by an 0805, 1000pF
XY
®
component acheiving superior EMI filtering by a component a fraction
of the size and cost.
No Filter
CMC 5uH
XY® 1000pF
Ambient
Common Mode Choke
9.0 x 6.0 x 5.0 mm
.0 x 1.3 x 1.0 mm
DC Motor EMI Reduction: A Superior Solution
One XY
®
component has successfully replaced 7 discrete filter components
while achieving superior EMI filtering.
XY
®
www.johanson dielectrics.com
X2Y
®
F
ilter
& D
ecoupling
c
apacitors
X2Y
®
Circuit 2: Decoupling
When used in circuit configuration, A & B capacitors are placed in parallel effectively doubling the apparent capacitance while maintaining an ultra-low
inductance. The low inductance advantages of the XY® Capacitor Circuit enables high-performance bypass networks at reduced system cost.
Power
G1
A
G
B
• Low ESL (device only and mounted)
• Broadband performance
• Effective on PCB or package
• Lower via count, improves routing
• Reduces component count
• Lowers placement cost
Ground
Component Performance
The XY
®
has short, multiple and opposing current paths
resulting in lower device inductance.
Mounted Performance
Mutual coupling from
opposing polarity vias
lowers inductance when
mounted on a PCB.
SYSTEM PERFORMANCE
1:5 MLCC Replacement Example
XY’s
®
proven technology enables end-users to use one XY
capacitor to replace five conventional MLCCs in a typical high
performance IC bypass design. Vias are nearly cut in half, board
space is reduced and savings are in dollars per PCB.
104 MLCs
0402 47nF
20 X2Y
®
0603 100nF
Transfer Impedance
seen by FPGA
www.johanson dielectrics.com
3
X2Y
®
F
ilter
& D
ecoupling
c
apacitors
XY
®
filter capacitors employ a unique, patented low inductance design featuring two balanced capacitors
that are immune to temperature, voltage and aging performance differences.
These components offer superior decoupling and EMI filtering performance, virtually eliminate parasitics,
and can replace multiple capacitors and inductors saving board space and reducing assembly costs.
A
dvAntAges
•
•
•
•
•
One device for EMI suppression or decoupling
Replace up to 7 components with one XY
Differential and common mode attenuation
Matched capacitance line to ground, both lines
Low inductance due to cancellation effect
A
pplicAtions
•
•
•
•
•
FPGA / ASIC / µ-P Decoupling
DDR Memory Decoupling
Amplifier FIlter & Decoupling
High Speed Data Filtering
Cellular Handsets
CB
W
Equivalent Circuits
A
G1
B
G2
Cross-sectional View
G
A
Dimensional View
CB
EB
B
G
W
L
T
EB
pF
0pF
10pF
7pF
33pF
7pF
100pF
70pF
.0mF .0mF
.09mF .07mF
0.mF 0.1mF
0.mF 0.mF
0.80mF 0.0mF
0
00pF 00pF
000pF 1000pF
3000pF 1500pF
Circuit 1
(Y Cap.)
900pF 700pF
T
L
SIZE
EIA
(JDI)
0402
X07
Circuit
(*Y Cap.)
Order
Code
X7R
NPO
1R0
5R6
0
1
10
15
7
3
10
33
50
6.3
50
100
50
0603
X14
X7R
5
10
6.3
100
50
100
50
50
100
50
100
50
100
50
100
50
= RoHS NPO
= RoHS X7R
0805
X15
NPO
X7R
NPO
X7R
X7R
X7R
X7R
1206
X18
1210
X41
1410
X44
1812
X43
Circuit 1 (Balanced Filtering) = A (or B) to G Circuit (Decoupling) = A + B to G
[A to B capacitance = 1/ C1]
Rated voltage is for A or B to ground. A to B rating is X Vrated
Contact the factory for other voltage ratings and capacitance values.
www.johanson dielectrics.com
7
100
70
330
70
101
71
103
73
1
0.9mF 0.7mF
1.0pF
5.6pF
.00mF .010mF
0.0mF 0.10mF
0.68mF 0.33mF
11.pF
pF
.0pF
5pF
0pF
9pF
66pF
00pF
0pF
90pF
X2Y
®
F
ilter
& D
ecoupling
c
apacitors
Filtering
Circuit 1 S21
Signal-to-Ground
Signal 1
Ground
Signal
G1
B
A
G
Decoupling
Circuit 2 S21
Power-to-Ground
Power
G1
A
G
B
Ground
Additional test data and related information available at www.johansondielectrics.com/xy/
Logic analyzers are widely used tools in digital design verification and debugging. They can verify the proper functioning of digital circuits and help users identify and troubleshoot faults. They ...[详细]
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