Document
Data Sheet
FEATURES
Micropower, Dual-Channel Digital Isolators ADuM1240/ADuM1241/ADuM1245/ADuM1246
FUNCTIONAL BLOCK DIAGRAM
VDD1 1 GND1 2 NIC 3 NIC 4 VIA/VOA 5 VIB 6 EN1 7 NIC 8 NIC 9 GND1 10 ENCODE ENCODE DECODE DECODE
Ultralow power operation 3.3 V operation 16 µA per channel maximum quiescent current, refresh enabled 0.3 µA per channel typical quiescent current, refresh disabled 148 µA/Mbps per channel typical dynamic current 2.5 V operation 8 µA per channel maximum quiescent current, refresh enabled 0.1 µA per channel typical quiescent current, refresh disabled 116 µA/Mbps per channel typical dynamic current Small, 20-lead SSOP package Bidirectional communication Up to 2 Mbps data rate (NRZ) High temperature operation: 125°C High common-mode transient immunity: >25 kV/μs Safety and Regulatory Approvals UL 1577 component recognition program (pending) 3750 V rms for 1 minute per UL 1577 CSA Component Acceptance Notice 5A (pending) VDE certificate of conformity (pending) DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12 VIORM = 849 V peak
ADuM124x
20 19 18 17 16 15 14 13 12 11
VDD2 GND2 NIC NIC VOA/VIA VOB EN2 NIC
11925-002
NIC GND2
Figure 1.
and an input glitch filter for extraneous noise disturbance protection. All models operate with an independent supply voltage on either side (between 2.25 V and 3.6 V), providing compatibility with lower voltage systems and enabling voltage level translation functionality across the isolation barrier. In the absence of input power, the products default to a predetermined output logic state: the ADuM1240 and ADuM1241 default to high output, and the ADuM1245 and ADuM1246 default to low output.
PRODUCT HIGHLIGHTS
1. Microwatt Power. These 3.75 kV digital isolators consume less than 15 μW per channel quiescent and 950 μW per channel at 2 Mbps. Low Supply Operation. Supports power supply voltages down to 2.25 V. iCoupler Technology. Patented Analog Devices technology combining high speed CMOS and monolithic air core transformer technologies.
1000
APPLICATIONS
General-purpose, low power, multichannel isolation 1 MHz low power SPI 4 mA to 20 mA loop process control
2. 3.
GENERAL DESCRIPTION
The ADuM1240/ADuM1241/ADuM1245/ADuM12461 are micropower, dual-channel digital isolators based on the Analog Devices, Inc., iCoupler® technology. Combining high speed CMOS and monolithic air core transformer technologies, these isolation components provide outstanding performance characteristics superior to alternatives, such as optocoupler devices, yet consume extremely low power. Packaged in a 20-lead SSOP, this series of dual, 3.75 kV rms digital isolation devices operate with supplies as low as 2.25 V and typically consume a minimal current of less than 6 µA per channel at data rates below 20 kbps, a fraction of the power of comparable isolators at comparable data rates (up to 2 Mbps). In addition, all models provide low pulse width distortion (<8 ns)
1
CURRENT PER CHANNE L (µA)
100
10 ENx = 0 ENx = 1
1
1
10
10.