LTC2498IUHF#PBF Linear Technology, LTC2498IUHF#PBF Datasheet - Page 34
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LTC2498IUHF#PBF
Manufacturer Part Number
LTC2498IUHF#PBF
Description
IC ADC 24BIT 16CH 38-QFN
Manufacturer
Linear Technology
Datasheet
1.LTC2498CUHFPBF.pdf
(38 pages)
Specifications of LTC2498IUHF#PBF
Number Of Bits
24
Sampling Rate (per Second)
7.5
Data Interface
MICROWIRE™, Serial, SPI™
Number Of Converters
1
Power Dissipation (max)
480µW
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
38-WFQFN, Exposed Pad
Number Of Elements
1
Resolution
24Bit
Architecture
Delta-Sigma
Sample Rate
0.008KSPS
Input Polarity
Bipolar
Input Type
Voltage
Rated Input Volt
±2.75V
Differential Input
Yes
Power Supply Requirement
Single
Single Supply Voltage (typ)
3.3/5V
Single Supply Voltage (min)
2.7V
Single Supply Voltage (max)
5.5V
Dual Supply Voltage (typ)
Not RequiredV
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Integral Nonlinearity Error
10ppm of Vref
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
38
Package Type
QFN EP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
applications inForMation
LTC2498
mode rejection of line frequencies. The common mode
rejection of line frequencies remains unchanged, thus fully
differential input signals with a high degree of symmetry
on both the IN
frequency noise.
An increase in f
input and reference current. External RC networks will
continue to have zero differential input current, but the
–1500
–2500
–3500
–1000
–2000
–3000
–500
–100
–110
–120
–130
–140
Figure 30. Input Normal Mode Rejection
2x Speed Mode with and Without Running
Averaging
–70
–80
–90
Figure 33.–FS Error vs Output Data Rate
and Temperature
0
48
0
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
V
V
f
O
IN(CM)
CC
10
= EXT CLOCK
OUTPUT DATA RATE (READINGS/SEC)
50
= V
20 30
REF
= V
52
+
REF(CM)
= 5V
EOSC
and IN
T
A
40
54
= 85°C
also increases the effective dynamic
50
NO AVERAGE
56
–
60
pins will continue to reject line
T
A
58
70
RUNNING
= 25°C
AVERAGE
WITH
80
60
90 100
2498 F33
2498 F30
62
Figure 34. Resolution (Noise
vs Output Data Rate and Temperature
–10
50
40
30
20
10
24
22
20
18
16
14
10
12
0
Figure 31. Offset Error vs Output Data
Rate and Temperature
0
0
V
V
V
f
V
V
V
f
RES = LOG 2 (V
O
O
IN(CM)
CC
IN
IN(CM)
CC
IN
10
10
= EXT CLOCK
OUTPUT DATA RATE (READINGS/SEC)
= EXT CLOCK
OUTPUT DATA RATE (READINGS/SEC)
= 0V
= V
= 0V
= V
T
A
20
20 30
REF
= V
= 85°C
REF
= V
REF(CM)
= 5V
30
REF(CM)
= 5V
T
T
REF
40
A
40
A
= 85°C
= 25°C
/NOISE
50
50
time required for complete settling (580ns for f
307.2kHz) is reduced, proportionally.
Once the external oscillator frequency is increased above
1MHz (a more than 3x increase in output rate) the effective-
ness of internal auto calibration circuits begins to degrade.
This results in larger offset errors, full scale errors, and
decreased resolution, see Figures 31 to 38.
T
A
60
60
RMS
= 25°C
70
70
)
RMS
80
80
≤ 1LSB)
90
90 100
2498 F31
2498 F34
100
3500
3000
2500
2000
1500
1000
500
22
20
18
16
14
10
12
Figure 35. Resolution (INL
vs Output Data Rate and Temperature
0
Figure 32. +FS Error vs Output Data
Rate and Temperature
0
0
V
V
f
RES = LOG 2 (V
V
V
f
O
O
IN(CM)
CC
IN(CM)
CC
10
10
= EXT CLOCK
= EXT CLOCK
OUTPUT DATA RATE (READINGS/SEC)
OUTPUT DATA RATE (READINGS/SEC)
= V
= V
T
A
20 30
20 30
REF
REF
= V
= V
= 85°C
REF(CM)
= 5V
REF(CM)
= 5V
REF
T
40
40
A
/INL
= 85°C
50
50
MAX
T
60
A
60
)
= 25°C
70
70
T
A
MAX
= 25°C
80
80
EOSC
≤ 1LSB)
90 100
90 100
2498 F32
2498 F35
2498fe
=