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What is LTM2895?

This electronic component, produced by the manufacturer "Linear Technology", performs the same function as "100MHz Isolated DAC SPI Serial Interface".


LTM2895 Datasheet PDF - Linear Technology

Part Number LTM2895
Description 100MHz Isolated DAC SPI Serial Interface
Manufacturers Linear Technology 
Logo Linear Technology Logo 


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FEATURES
nn Isolated Interface: 6000VRMS for 1 Minute
nn UL-CSA-IEC Certification Pending
nn 100MHz SPI-Compatible I/O
nn Configurable SPI Word-Length: 8 to 32 Bits
nn Supports Two Isolated Chip Selects
nn Falling Edge Sensitive Low Jitter LOAD
nn Three Isolated Control or Multiplexer Signals
nn 1.71V to 5.5V I/O Voltages
nn 3V to 5.5V Supply Voltages
nn High Common Mode Transient Immunity
nn 15mm × 6.25mm BGA Package
APPLICATIONS
nn Remote Interface Control
nn Industrial Process Control and Automation
nn Test and Measurement Equipment
nn Breaking Ground Loops
LTM2895
100MHz Isolated
DAC SPI Serial Interface
DESCRIPTION
The LTM®2895 is a high speed isolated µModule® (micro-
module) SPI interface with DAC control signals designed
to isolate LTC’s family of general purpose DACs and to
isolate general purpose SPI interfaces. The LTM2895
works with DACs and general purpose devices that have
a mode (0, 0) SPI interface.
The interface enables fast data throughput, which makes
the LTM2895 ideally suited for a wide variety of applica-
tions. The high speed SPI-compatible serial port supports
1.71V to 5.5V logic supplies. The LTM2895 is targeted at
generic SPI and digital-to-analog converter applications.
The isolation barrier tolerates large voltage ground varia-
tions between the logic interface and the isolated side of
the LTM2895. Uninterrupted communication is maintained
during voltage transients greater than 50kV/µs.
L, LT, LTC, LTM, Linear Technology, the Linear logo and μModule are registered trademarks
and SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
3.3V
VDD
ON
SYSINT
FLTINT
LOAD
μP
CS
CS2
SCK
MOSI
MISO
CLR
GND
10k VL VCC
ON
BUSY
FAULT
LOAD
SS
SSB
SCK
MOSI
MISO
SA
SB
SC
GND
LTC2642-16 DAC Isolation
5Vi 8Vi
VCC2 VL2
ON2
LTM2895
LOAD2
SS2
SSB2
SCK2
MOSI2
MISO2
SA2
SB2
SC2
GND2
2895 TA01
LT6654-5
VIN VOUT
GND
5Vi
10µF
100k
VDD REF
RFB
CS INV
SCK LTC2642-16
DIN VOUT
CLR
GND
27pF
8Vi
+ LT1468
–8Vi
CONFIGURATION REGISTERS: WRITE 0x30H AND 0x83H
SETS SCK2 TO 33MHz AND WORDLENGTH TO 16-BIT
Vi = ISOLATED VOLTAGE SUPPLY
OUT
For more information www.linear.com/LTM2895
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LTM2895 equivalent
LTM2895
S WITCHING CHARACTERISTICS The l denotes specifications that apply over the full specified operating
temperature range, otherwise specifications
GND2 = 0V; unless otherwise noted.
are
at
TA
=
25°C,
CL
=
20pF,
VCC
=
5V,
VL
=
3.3V,
GND
=
0V,
VCC2
=
5V,
VL2
=
3.3V,
SYMBOL
PARAMETER
tDLYSCKMOSI2
tDLYMOSI2SCK2
tSSSPACE
tSS2FSCK2
tSCK2SS2DIS
Delay SCKto MOSI2 Valid
Setup MOSI2 to SCK2
SSor SSBSpace to SSor SSB
SS2or SSB2Delay to SCK2
Last SCK2to SS2or SSB2
MISO Rise/Fall Time
LOAD2, SS2, SSB2, MOSI2, SCK2 Rise/Fall
Time
Select Signals
SA, SB, SC Propagation Delay
SA2, SB2, SC2 Rise/Fall Time
CONDITIONS
(Note 2)
SCK2 Frequency 50MHz
SCK2 Frequency 50MHz
(Note 7)
(Note 7)
1.71V ≤ VL ≤ 5.5V
1.71V ≤ VL2 ≤ 5.5V
MIN TYP MAX UNITS
24 ns
l 1.5
ns
l 60
ns
l 45
ns
l 32
ns
500 ps
500 ps
l 40
l
80 150
10 20
ns
ns
I SOLATION CHARACTERISTICS TA = 25°C
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
VISO
Rated Dielectric Insulation Voltage
1 Minute, Derived from 1 Second
(Notes 4, 5, 6)
1 Second
6000
7200
Common Mode Transient Immunity
VCC = VL = ON = 5V to GND, VCC2 = VL2 =
ON2 = 5V to GND2, 1000V in 20ns
Transient Between GND and GND2 (Note 7)
50
100
VRMS
VRMS
kV/μs
VIORM
CTI
Maximum Working Insulation Voltage
Partial Discharge
Comparative Tracking Index
Depth of Erosion
(Note 2)
VPD = 1830VPEAK (Note 4)
IEC 60112 (Note 2)
IEC 60112 (Note 2)
1000
690
600
0.017
VPEAK, VDC
VRMS
5 pC
VRMS
mm
DTI Distance Through Insulation
(Note 2)
0.2 mm
Input to Output Resistance
(Notes 2, 4)
15
Input to Output Capacitance
(Notes 2, 4)
3 pF
Creepage Distance
(Note 2)
9.2 mm
Note 1. Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2. Guaranteed by design, not production tested.
Note 3. Maximum data rate is guaranteed by other measured parameters
and is not directly tested.
Note 4. Device considered a 2-terminal device. Measurement between
groups of pins A1 through C6 shorted together and pins N1 through R6
shorted together.
Note 5. The rated dielectric insulation voltage should not be interpreted as
a continuous voltage rating.
Note 6. In accordance with UL1577, each device is proof tested for the
6000VRMS rating by applying an RMS voltage multiplied by an acceleration
factor of 1.2 for one second.
Note 7. Evaluated by Design, not production tested.
Note 8. See Table 4 and Table 5 for minimum and maximum timing
specifications affected by the selection of SCK2 frequencies in the
configuration register.
Note 9. All currents into device pins are positive; all currents out of device
are negative. All voltages are referenced to their corresponding ground
unless otherwise specified.
Note 10. Continuous operation above specified maximum operating
junction temperature may result in device degradation or failure.
For more information www.linear.com/LTM2895
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Part Details

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Information Total 28 Pages
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