Download Opto-coupler Solution

Introducing the Si844x Digital Isolator
March 2006
Key Market Segments
Broadcast
STB Tuners
Wireless
Wireline
Voice Solutions
 ProSLIC  Voice DAA
Timing Solutions
Modem Solutions
 ISOmodem
FM Tuners
Aero Transceivers
AeroFONE
Power Amplifiers
RF Synthesizer
 DAA
Power Solutions
Controllers
Isolators
MCU
8-bit Mixed-Signal MCUs
2
Diverse Isolator Market
 Digital isolators address expanding applications
 More than 3 billion isolator units sold by 2010
3500
CAGR=17.1%
3000
Plasma TV
2500
Isolated Data Acq.
M Units
2000
Motor Control
Electronic Ballast
1500
Isolated DC-DC
1000
AC-DC Supplies
500
0
2005
2006
2007
2008
2009
Isolator TAM by Application
3
2010
Isolator Applications
PRIMARY-SIDE
POWER STAGES,
DRIVERS AND PEAK
CURRENT SENSING
VIN
SECONDARY-SIDE
POWER STAGES,
DRIVERS AND
OUTPUT FILTER
 Example circuit applications:
VOUT
PH3
VSENSE
PH4
 Isolation
 Level shifting
 Ground loop elimination
(ISOLATED)
4
I/O
PH1
Isolator
DIGITAL
ISOLATOR
Si84xx
I/O
Analog
and digital
primary-side I/O
PH2
Rx
Tx
Tx
Rx
Si8250
Analog and digital
secondary-side I/O
I/O
I/O
ISOLATED AUX SUPPLY
VDD
GND
Digitally Controlled Power
 Example end applications:
 AC-DC and DC-DC switching
supplies
 Motor Control Systems
 Isolated analog data acquisition
 Plasma TVs
 Ethernet/CAN Networks
 Isolated point-to-point
communications
 UPS systems
 Operator interface controls
ICYC
C8051F30x
C8051F30x
AIN0
3V Logic
Isolator
Si84xx
5V Logic
Level Shifting & Ground Loop Elimination
Analog
Input
ADC
Isolator
Si84xx
Isolated Analog Sampling
Micro
Traditional Isolator Limitations
 Opto-couplers
 Performance degrades at high temp
 Usually only singles per package
 Limited data rate (most 10 Mbps or less)
 Giant magneto-resistive
 Limited to about 100 Mbps
 Random startup states
 Pulse transformers
 Bulky
 Expensive in cost and real estate
 No dc correctness
 Galvanic isolators
 Limited to about 80 Mbps
 Expensive
5
Introducing the Si844x Quad Digital Isolators
 Highest integrated 2.5 kV 4-channel isolator
 1/3 the size of opto-coupler solutions
 50% lower bill-of-material costs
 Fastest throughput digital isolator
 150 Mbps max throughput
 50% faster than existing digital isolators
 Lowest power consumption at high speeds
 12 mA per channel at 100 Mbps
 Substantially lower than opto-coupler solutions
 Highest temperature operation
 125°C at 100Mbps, 100°C at 150 Mbps
 Easy-to-use single-chip solution
 Specification compliant with UL, CSA and VDE electrical safety standards
 Stable operating characteristics over temperature, supply voltage and time
 Pin compatible with existing industry solutions
6
Leveraging World-class RF Expertise
Isolation
Transmitter
Receiver
RF Modulator
(2.1 GHz Carrier
Generator)
RF Demodulator
(2.1 GHz Carrier
Detector)
Modulation Scheme
Input Signal
Modulation Signal
Output Signal
 Based on Silicon Laboratories’ patented RF technology
 Implements RF modulation demodulation scheme to transfer data
7
Si844x Reduces Board Complexity
 Higher integration
 Up to four channels per part
 No external components
 Easy-to-use
 Insignificant sensitivity to temperature, supply voltage and aging
 Simplifies board layout
Opto-coupler Solution
R1
Silicon Laboratories Solution
Agilent Recommended
C2
Interface Circuit
C1
D1
C2
R5
HCPL
- 0631
D2
R3
R6
10 mm
25 m m
R2
D4
HCPL
- 0601
R7
Si 8401
Data
Converter
C1
C3
R4
D3
HCPL
- 0601
17 mm
8
R8
16 mm
Data
Converter
10
10
9
9
Delay (ns)
Delay (ns)
Industry’s Fastest, Lowest Power Isolator
Rising Edge
8
Falling Edge
7
6
8
Falling Edge
7
6
5
Rising Edge
5
-40
-20
0
20
40
60
80
100
120
-40
Temperature (Degrees C)
9
0
20
40
60
80
100
Temperature (Degrees C)
Propagation Delay 5 V
Part
-20
Propagation Delay 3.3 V
mW/ch
MHz
mW/MHz
Si844x
12
150
0.1
Competitor A
155
90
1.7
Opto-coupler 1
160
40
4.0
Opto-coupler 2
40
6
6.7
Opto-coupler 3
90
10
9.0
Opto-coupler 4
150
11
13.6
Opto-coupler 5
40
1
40.0
Opto-coupler 6
55
0.1
550.0
120
Summary
 The Si844x delivers the highest integration, fastest
throughput, lowest power 2.5 kV 4-channel isolator
 Leverages RF expertise to deliver innovative isolator
technology
 The easiest to use single-chip solution targeting isolation,
level shifting and ground loop elimination applications
10
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www.silabs.com/DigitalPower