ADUM1240 Datasheet, PDF (1/24 Pages) Analog Devices – Micropower, Dual-Channel Digital Isolators

Data Sheet
Micropower, Dual-Channel Digital Isolators
ADuM1240/ADuM1241/ADuM1245/ADuM1246
FEATURES
Ultralow power operation
3.3 V operation
5.6 µA per channel quiescent current, refresh enabled
0.3 µA per channel quiescent current, refresh disabled
148 µA/Mbps per channel typical dynamic current
2.5 V operation
3.1 µA per channel quiescent current, refresh enabled
0.1 µA per channel quiescent current, refresh disabled
116 µA/Mbps per channel typical dynamic current
Small, 20-lead SSOP package and small 8-lead SOIC package
Bidirectional communication
Up to 2 Mbps data rate nonreturn to zero (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 (20-lead SSOP)
3000 V rms for 1 minute per UL 1577 (8-lead SOIC)
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 (20-lead SSOP)
VIORM = 560 V peak (8-lead SOIC)
APPLICATIONS
General-purpose, low power, multichannel isolation
1 MHz low power serial peripheral interface (SPI)
4 mA to 20 mA loop process control
GENERAL DESCRIPTION
The ADuM1240/ADuM1241/ADuM1245/ADuM1246¹ are
micropower, 2-channel, digital isolators based on the Analog
Devices, Inc., iCoupler® technology. Combining high speed,
complementary metal oxide semiconductor (CMOS) and
monolithic air core transformer technologies, these isolation
components provide outstanding performance characteristics
superior to the alternatives, such as optocoupler devices.
The 20-lead SSOP version of the ADuM1240/ADuM1241/
ADuM1245/ADuM1246 allows control of the internal refresh
functions. As shown in Figure 3, in standard operating mode,
when ENx = 0 (internal refresh enabled), the current per channel is
less than 10 µA.
When ENx = 1 (internal refresh disabled), the current per
channel drops to less than 1 µA.
FUNCTIONAL BLOCK DIAGRAMS
V_DD1 1
GND₁ 2
NIC 3
ADuM124x
20 V_DD2
19 GND₂
18 NIC
NIC 4
17 NIC
V_IA/V_OA 5
V_IB 6
EN₁ 7
NIC 8
NIC 9
GND₁ 10
ENCODE
ENCODE
DECODE
DECODE
16 V_OA/V_IA
15 V_OB
14 EN₂
13 NIC
12 NIC
11 GND₂
Figure 1. 20-Lead SSOP Package Functional Block Diagram
V_DD1 1
V_IA/V_OA 2
V_IB 3
ADuM124x
ENCODE
ENCODE
GND₁ 4
DECODE
DECODE
8 V_DD2
7 V_OA/V_IA
6 VOB
5 GND₂
Figure 2. 8-Lead SOIC Package Functional Block Diagram
The ADuM1240/ADuM1241/ADuM1245/ADuM1246 are
packaged in either a 20-lead SSOP for 3.75 kV reinforced
isolation or an 8-lead SOIC for 3 kV basic isolation. The devices
meet regulatory requirements, such as UL and CSA standards.
In addition to the space saving package options, the ADuM1240/
ADuM1241/ADuM1245/ADuM1246 operate with supplies as
low as 2.25 V. All models provide low, pulse width distortion at
<8 ns. In addition, every model has an input glitch filter to
protect against extraneous noise disturbances.
1000
100
10
EN_x = 0
1
EN_x = 1
0.1
0.1
1
10
100
1000
10000
DATA RATE (kbps)
Figure 3. Typical Total Supply Current (IDD1 + IDD2) per Channel (VDDx = 3.3 V)
as a Function of Data Rate
1 _{Protected by U.S. Patents 5,952,849, 6,873,065, 7,075,329, 6,262,600. Other patents pending.}
Rev. A
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