LTC2400 Linear Technology, LTC2400 Datasheet - Page 9

• Manufacturer Part Number: LTC2400
• Description: 24-Bit uPower No Latency ADC in SO-8
• Manufacturer: Linear Technology

FU CTIO AL BLOCK DIAGRA
APPLICATIONS
TEST CIRCUITS
Converter Operation Cycle
The LTC2400 is a low power, delta-sigma analog-to-
digital converter with an easy to use 3-wire serial interface.
Its operation is simple and made up of three states. The
converter operating cycle begins with the conversion,
followed by a low power sleep state and concluded with
the data output (see Figure 1). The 3-wire interface con-
sists of serial data output (SDO), a serial clock (SCK) and
a chip select (CS).
Initially, the LTC2400 performs a conversion. Once the
conversion is complete, the device enters the sleep state.
While in this sleep state, power consumption is reduced by
V
GND
V
V
REF
CC
U
IN
U
U
SDO
INFORMATION
DAC
U
HI-Z TO V
V
V
3.4k
OL
OH
TO V
TO HI-Z
OH
OH
W
C
LOAD
2400 TA03
= 20pF
U
W
ADC
Figure 1. LTC2400 State Transition Diagram
SDO
AUTOCALIBRATION
DECIMATING FIR
HI-Z TO V
V
V
AND CONTROL
OH
OL
1
V
TO HI-Z
TO V
CC
DATA OUTPUT
3.4k
CONVERT
OL
C
OL
CS AND
SCK
SLEEP
LOAD
0
2400 TA04
= 20pF
2400 F01
OSCILLATOR
INTERFACE
INTERNAL
SERIAL
LTC2400
(INT/EXT)
F
SDO
SCK
CS
2400 FD
O
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