LTC2498IUHF#PBF Linear Technology, LTC2498IUHF#PBF Datasheet - Page 34

• Manufacturer Part Number: LTC2498IUHF#PBF
• Description: IC ADC 24BIT 16CH 38-QFN
• Manufacturer: Linear Technology

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

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
=