LTC2413 LINER [Linear Technology], LTC2413 Datasheet - Page 15

• Manufacturer Part Number: LTC2413
• Description: 24-Bit No Latency ADC, with Simultaneous 50Hz/60Hz Rejection
• Manufacturer: LINER [Linear Technology]

APPLICATIO S I FOR ATIO
While operating with an external conversion clock of a
frequency f
normal mode rejection in a frequency range f
frequency deviation from f
Whenever an external clock is not present at the F
converter automatically activates its internal oscillator and
enters the Internal Conversion Clock mode. The LTC2413
operation will not be disturbed if the change of conversion
clock source occurs during the sleep state or during the
data output state while the converter uses an external
serial clock. If the change occurs during the conversion
state, the result of the conversion in progress may be
outside specifications but the following conversions will
not be affected. If the change occurs during the data output
state and the converter is in the Internal SCK mode, the
serial clock duty cycle may be affected but the serial data
stream will remain valid.
Table 3 summarizes the duration of each state and the
achievable output data rate as a function of F
SERIAL INTERFACE PINS
The LTC2413 transmits the conversion results and re-
ceives the start of conversion command through a syn-
chronous 3-wire interface. During the conversion and
sleep states, this interface can be used to assess the
converter status and during the data output state it is used
to read the conversion result.
Table 3. LTC2413 State Duration
State
CONVERT
SLEEP
DATA OUTPUT
4%. The normal mode rejection as a function of the input
EOSC
, the LTC2413 provides better than 110dB
Operating Mode
Internal Oscillator
External Oscillator
Internal Serial Clock
External Serial Clock with
Frequency f
U
SCK
U
EOSC
kHz
/2560 is shown in Figure 5.
W
F
Simultaneous 50Hz/60Hz Rejection
F
with Frequency f
(f
F
(Internal Oscillator)
F
Frequency f
O
O
O
O
EOSC
= LOW
= External Oscillator
= LOW
= External Oscillator with
O
EOSC
.
/2560 Rejection)
U
O
pin the
EOSC
/2560
EOSC
kHz
kHz
Figure 5. LTC2413 Normal Mode Rejection When
Using an External Oscillator of Frequency f
Figure 4. LTC2413 Normal Mode Rejection
When Using an Internal Oscillator
Duration
147ms, Output Data Rate 6.8 Readings/s
20510/f
As Long As CS = HIGH Until CS = LOW and SCK
As Long As CS = LOW But Not Longer Than 1.83ms
(32 SCK cycles)
As Long As CS = LOW But Not Longer Than 256/f
(32 SCK cycles)
As Long As CS = LOW But Not Longer Than 32/f
(32 SCK cycles)
–100
–105
–110
–115
–120
–125
–130
–135
–140
–80
–85
–90
–95
–100
–100
–120
–130
–140
–80
–90
DEVIATION FROM NOTCH FREQUENCY f
–12
48
EOSC
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
DIFFERENTIAL INPUT SIGNAL FREQUENCY
s, Output Data Rate f
–8
50
52
–4
54
0
56
4
58
EOSC
EOSC
LTC2413
8
/20510 Readings/s
60
/2560(%)
2413 F05
2413 F04
EOSC
12
62
SCK
EOSC
sn2413 2413fs
15
ms
ms