LTC2422CMS#TRPBF Linear Technology, LTC2422CMS#TRPBF Datasheet - Page 30

• Manufacturer Part Number: LTC2422CMS#TRPBF
• Description: IC ADC 2CH 20BIT MICRPWR 10-MSOP
• Manufacturer: Linear Technology

Specifications of LTC2422CMS#TRPBF

• Number Of Bits: 20
• Sampling Rate (per Second): 7.5
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 2
• Power Dissipation (max): 1mW
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIO S I FOR ATIO
LTC2421/LTC2422
Below 4.2V, the LTC1535’s driver outputs Y and Z are in a
high impedance state, allowing the 1k pull-down to de-
fine the logic state at SCK. When the LTC2422 first be-
comes active, it samples SCK; a logic “0” provided by the
1k pull-down invokes the external serial clock mode. In
this mode, the LTC2422 is controlled by a single clock line
from the nonisolated side of the barrier, through the
LTC1535’s driver output Y. The entire power-up sequence,
30
LOGIC 5V
“SDO”
“SCK”
U
1
U
TANT
10 F
10V
RO
RE
DE
DI
+
V
ST1
Figure 36. Complete, Isolated 20-Bit Data Acquisition System
CC1
1
W
T1
ISOLATION
ST2
G1
BARRIER
1
G2
LTC1535
1/2 BAT54C
1/2 BAT54C
2
U
T1 = COILTRONICS CTX02-14659
1
2
= LOGIC COMMON
= FLOATING COMMON
OR SIEMENS B78304-A1477-A3
+
V
CC2
10 F
16V
TANT
1 F
A
B
Y
Z
from the time power is applied to V
output has reached 5V, is approximately 1ms.
Data returns to the nonisolated side through the LTC1535’s
receiver at RO. An internal divider on receiver input B sets
a logic threshold of approximately 3.4V at input A, facili-
tating communications with the LTC2422’s SDO output
without the need for any external components.
IN
SHDN
LT1761-5
+
GND
2
2
2
1k
OUT
BYP
10 F
10V
TANT
2
10 F
F
SCK
SDO
CS
GND
O
LTC2422
+
FS
ZS
CH1
CH0
V
SET
SET
10 F
10V
TANT
CC
CERAMIC
10 F
CC1
2
until the LT1761’s
24212 F36
24212f