Linear Technology 1790A Demo Manual

Fixed ±5V and Adjustable 5V Regulated Power
Description
Demonstration circuit 1790A is a serial peripheral interface
bus (SPI) or inter-IC bus (I
fixed ±5V and adjustable 5V regulated power featuring the
LTM 2886. The demo circuit features an EMI optimized
®
circuit configuration and printed circuit board layout. All
components are integrated into the µModule isolator. The
demo circuit operates from a single external supply on
V . The part generates output voltages on V
CC
perForMAnce sUMMArY
SYMBOL PARAMETER
V Input Supply Range
CC
V Regulated Output Voltage
CC2
Adjustable Output Voltage Range
Current Limit
+
V Regulated Output Voltage
Current Limit
–
V Regulated Output Voltage
Current Limit
f Maximum Data Rate
MAX
V Maximum Working Insulation Voltage
IORM
Common Mode Transient Immunity
operAting principles
The LTM2886 contains an isolated DC/DC conversion
system, including a secondary quadrupler, with multiple
LDOs to deliver power to the three output voltage rails
from V . Isolation is maintained by the separation of
CC
GND and GND2 where significant operating voltages and
transients can exist without affecting the operation of the
Arrow.com.
Downloaded from
SPI/Digital or I
2
C) µModule isolator with
™
, which
CC2
(T = 25°C)
A
CONDITIONS
LTM2886-5
LTM2886-3
DI1 → O1, Ix → DOx, C
LTM2886-S, Bidirectional Communication
LTM2886-S, Unidirectional Communication
LTM2886-I
GND to GND2
DEMO MANUAL DC1790A
2
C µModule Isolator with
may be adjusted by an external programming resistor, and
+
fixed voltages on V and V
sary signaling across the isolation barrier through LTC's
isolator µModule technology.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
= 15pF
L
LTM2886. The logic side ON pin enables or shuts down the
LTM2886. All logic side signals are referenced to the logic
supply pin V . The LTM2886 is available in two data bus
L
configurations, SPI (–S) or I
voltage ranges, 3.0 to 3.6 volts (–3) or 4.5 to 5.5 volts (–5).
LTM2886
–
. It communicates all neces-
MIN TYP MAX UNITS
4.5 5 5.5
3.0 3 3.6
4.75 5 5.25
3.0 5.5
100
4.75 5 5.25
100
–4.75 –5 –5.25
100
20
4
8
400
560
400
30
2
C (–I), and with two input
dc1790af
V
V
V
V
mA
V
mA
V
mA
MHz
MHz
MHz
kHz
V
DC
V
RMS
kV/µs
1