LTC2448CUHF#TR Linear Technology, LTC2448CUHF#TR Datasheet - Page 22
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LTC2448CUHF#TR
Manufacturer Part Number
LTC2448CUHF#TR
Description
IC ADC 24BIT HI SPEED 38QFN
Manufacturer
Linear Technology
Datasheet
1.LTC2445CUHFPBF.pdf
(28 pages)
Specifications of LTC2448CUHF#TR
Number Of Bits
24
Sampling Rate (per Second)
8k
Data Interface
MICROWIRE™, Serial, SPI™
Number Of Converters
1
Power Dissipation (max)
40mW
Voltage Supply Source
Single Supply
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
38-WFQFN, Exposed Pad
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
APPLICATIO S I FOR ATIO
LTC2444/LTC2445/
LTC2448/LTC2449
Normal Mode Rejection and Antialiasing
One of the advantages delta-sigma ADCs offer over con-
ventional ADCs is on-chip digital filtering. Combined with
a large oversampling ratio, the LTC2444/LTC2445/
LTC2448/LTC2449 significantly simplify antialiasing filter
requirements.
The LTC2444/LTC2445/LTC2448/LTC2449’s speed/reso-
lution is determined by the over sample ratio (OSR) of the
on-chip digital filter. The OSR ranges from 64 for 3.5kHz
output rate to 32,768 for 6.9Hz (in No Latency mode)
output rate. The value of OSR and the sample rate f
determine the filter characteristics of the device. The first
NULL of the digital filter is at f
f
frequency f
22
N
= f
S
/OSR, see Figure 10 and Table 7. The rejection at the
Figure 10. LTC2444/LTC2445/LTC2448/LTC2449
Normal Mode Rejection (Internal Oscillator)
–100
–120
–140
–20
–60
–40
–80
N
0
±14% is better than 80dB, see Figure 11.
0
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
SINC
U
60
4
ENVELOPE
U
120
N
and multiples of f
180
W
2440 F11
240
U
N
where
S
Table 7. OSR vs Notch Frequency (f
Running at 9MHz)
*Simultaneous 50/60Hz rejection
Figure 11. LTC2444/LTC2445/LTC2448/LTC2449
Normal Mode Rejection (Internal Oscillator)
–100
–110
–130
–140
–120
32768*
–80
–90
16384
1024
2048
4096
8192
OSR
128
256
512
64
47
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
49
51
53
55
N
57
) (with Internal Oscillator
59
NOTCH (f
28.16kHz
14.08kHz
7.04kHz
3.52kHz
1.76kHz
880Hz
440Hz
220Hz
110Hz
61
55Hz
2440 F12
63
N
)
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