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LTC2439-1 Datasheet(PDF) 19 Page - Linear Technology

Part No. LTC2439-1
Description  8-/16-Channel 16-Bit No Latency Delta-Sigma ADC
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2439-1 Datasheet(HTML) 19 Page - Linear Technology

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LTC2439-1
19
24391f
Internal Serial Clock, 3-Wire I/O,
Continuous Conversion
This timing mode uses a 3-wire interface. The conversion
result is shifted out of the device by an internally generated
serial clock (SCK) signal, see Figure 11. CS may be perma-
nently tied to ground, simplifying the user interface or
isolation barrier.
The internal serial clock mode is selected at the end of the
power-on reset (POR) cycle. The POR cycle is concluded
approximately 1ms after VCC exceeds 2V. An internal weak
pull-up is active during the POR cycle; therefore, the
internal serial clock timing mode is automatically selected
if SCK is not externally driven LOW (if SCK is loaded such
that the internal pull-up cannot pull the pin HIGH, the
external SCK mode will be selected).
During the conversion, the SCK and the serial data output
pin (SDO) are HIGH (EOC = 1). Once the conversion is
complete, SCK and SDO go LOW (EOC = 0) indicating the
conversion has finished and the device has entered the
low power sleep state. The part remains in the sleep state
a minimum amount of time (1/2 the internal SCK period)
then immediately begins outputting data. The data input/
output cycle begins on the first rising edge of SCK and
ends after the 19th rising edge. The input data is then
shifted in via the SDI pin on the rising edge of SCK
(including the first rising edge) and the output data is
shifted out of the SDO pin on each falling edge of SCK.
The internally generated serial clock is output to the SCK
pin. This signal may be used to shift the conversion result
into external circuitry. EOC can be latched on the first
rising edge of SCK and the last bit of the conversion result
can be latched on the 19th rising edge of SCK. After the
19th rising edge, SDO goes HIGH (EOC = 1) indicating a
new conversion is in progress. SCK remains HIGH during
the conversion.
PRESERVING THE CONVERTER ACCURACY
The LTC2439-1 is designed to reduce as much as
possible the conversion result sensitivity to device
decoupling, PCB layout, antialiasing circuits, line fre-
quency perturbations and so on. Nevertheless, in order to
preserve the accuracy capability of this part, some simple
precautions are desirable.
APPLICATIO S I FOR ATIO
Figure 11. Internal Serial Clock, CS = 0 Continuous Operation
(1)
(0)
EN
SGL
A2
A1
A0
ODD/
SIGN
SDI
DON’T CARE
DON’T CARE
SDO
SCK
(INTERNAL)
CS
MSB
SIG
BIT 6
BIT 0
LSB
BIT 14
BIT 13
BIT 12
BIT 11
BIT 15
BIT 16
BIT 17
EOC
BIT 18
DATA OUTPUT
CONVERSION
CONVERSION
24391 F10
VCC
FO
REF+
REF
CH0
CH7
CH8
CH15
COM
SCK
SDI
SDO
CS
GND
920
11
12
21
28
1
8
10
18
17
15
16
19
REFERENCE
VOLTAGE
0.1V TO VCC
ANALOG
INPUTS
1
µF
2.7V TO 5.5V
LTC2439-1
3-WIRE
SPI INTERFACE
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/SIMULTANEOUS
50Hz/60Hz REJECTION
“O”


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