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LTC2445 Datenblatt(PDF) 18 Page - Linear Technology

Teilenummer LTC2445
Bauteilbeschribung  24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution
PDF  28 Pages
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Hersteller  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2445 Datenblatt(HTML) 18 Page - Linear Technology

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LTC2444/LTC2445/
LTC2448/LTC2449
18
sn2444589 2444589fs
APPLICATIO S I FOR ATIO
External Serial Clock, 2-Wire I/O
This timing mode utilizes a 2-wire serial I/O interface. The
conversion result is shifted out of the device by an exter-
nally generated serial clock (SCK) signal, see Figure 6. CS
may be permanently tied to ground, simplifying the user
interface or isolation barrier. The external serial clock
mode is selected by tying EXT LOW.
Since CS is tied LOW, the end-of-conversion (EOC) can be
continuously monitored at the SDO pin during the convert
and sleep states. Conversely, BUSY (Pin 2) may be used
to monitor the status of the conversion cycle. EOC or BUSY
may be used as an interrupt to an external controller
CS
SCK
(EXTERNAL)
SDI
SDO
BUSY
2444 F07
CONVERSION
SLEEP
DATA OUTPUT
CONVERSION
MSB
BIT 28 BIT 27 BIT 26 BIT 25 BIT 24 BIT 23 BIT 22 BIT 21
BIT 20 BIT 19
BIT 0
LSB
SIG
BIT 29
“0”
BIT 30
EOC
BIT 31
1
0
EN
SGL
A2
A1
A0
OSR3
OSR2
OSR1
OSR0
TWOX
ODD
12345
6
7
89
10
11
12
13
14
32
DON'T CARE
DON'T CARE
VCC
FO
REF+
REF–
CH0
CH7
CH8
CH15
COM
SCK
SDI
SDO
CS
GND
28
35
29
30
8
15
16
23
7
38
37
1,4,5,6,31,32,33
36
34
REFERENCE
VOLTAGE
0.1V TO VCC
ANALOG
INPUTS
2
= EXTERNAL OSCILLATOR
= INTERNAL OSCILLATOR
1µF
2.7V TO 5.5V
LTC2448
4-WIRE
SPI INTERFACE
•
•
•
•
•
•
•
•
•
•
•
•
BUSY
Figure 6. External Serial Clock, CS = 0 Operation (2-Wire)
indicating the conversion result is ready. EOC = 1
(BUSY = 1) while the conversion is in progress and
EOC = 0 (BUSY = 0) once the conversion enters the low
power sleep state. On the falling edge of EOC/BUSY, the
conversion result is loaded into an internal static shift
register. The device remains in the sleep state until the
first rising edge of SCK. Data is shifted out the SDO pin
on each falling edge of SCK enabling external circuitry to
latch data on the rising edge of SCK. EOC can be latched
on the first rising edge of SCK. On the 32nd falling edge
of SCK, SDO and BUSY go HIGH (EOC = 1) indicating a
new conversion has begun.



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