LTC2366 Linear Technology, LTC2366 Datasheet - Page 17

• Manufacturer Part Number: LTC2366
• Description: (LTC2365 / LTC2366) 12-Bit Serial Sampling ADCs
• Manufacturer: Linear Technology

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APPLICATIONS INFORMATION
Exiting Sleep Mode and Power-Up Time
To exit sleep mode, pull CS low and perform a dummy
conversion. The LTC2365/LTC2366 device power up com-
pletely after the 16th falling edge of SCK. After powering
up, the ADC can continuously acquire an input signal
and perform conversions as described in the SERIAL
INTERFACE section (see Figure 15). The wake-up time is
333ns for the LTC2366 with a 48MHz SCK and 1μs for the
LTC2365 with a 16MHz SCK.
The sample-and-hold is in hold mode while the device is in
sleep mode. The ADC returns to sample mode after the 1st
falling edge of SCK during power-up (see Figure 15).
Figure 16. Power Consumption vs Sample Rate while
the Device Remains Powered Up Continuously
SDO
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.0
SCK
3.5
CS
0
V
f
16 SCKS PER CONVERSION
SCK
DD
= 3V
= VARIABLE
500
1
SAMPLE RATE (ksps)
1000
2
THE DEVICE BEGINS
TO POWER UP
THE DEVICE BEGINS
TO ACQUIRE INPUT
1500
INVALID DATA
t
2000
POWER-UP
2500
Figure 15. LTC2365/LTC2366 Exiting Sleep Mode
10
23656 F16
3000
12
14
16
THE DEVICE IS FULLY
POWERED UP AND READY
TO PERFORM CONVERSION
POWER VERSUS SAMPLING RATE
Figure 16 shows the power consumption of the LTC2365/
LTC2366 in operational mode. By taking the ADC into sleep
mode when not performing a conversion, the average
power consumption of the ADC decreases as the sampling
rate decreases. Figure 17 shows the power consumption
versus sampling rate with the device in sleep mode when
not performing a conversion.
Figure 17. Power Consumption vs Sample Rate while the Device
Enters Sleep Mode when not Performing Conversions
1 2
8
7
6
5
4
3
2
1
0
0
V
f
SCK
DD
= 3V
= 48MHz
250
VALID DATA
LTC2365/LTC2366
SAMPLE RATE (ksps)
10
500
12
750
14
16
23656 F17
1000
23656 F15
17
23656f