LTC2498IUHF#PBF Linear Technology, LTC2498IUHF#PBF Datasheet - Page 32

• 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
to 15dB (see Figure 22), if noise sources are present at
these frequencies anti-aliasing will reduce their effects.
The user can expect to achieve this level of performance
using the internal oscillator, as shown in Figures 23, 24,
and 25. Measured values of normal mode rejection are
shown superimposed over the theoretical values in all
three rejection modes.
Traditional high order delta-sigma modulators suffer
from potential instabilities at large input signal levels.
The proprietary architecture used for the LTC2498 third
order modulator resolves this problem and guarantees
stability with input signals 150% of full-scale. In many
industrial applications, it is not uncommon to have mi-
crovolt level signals superimposed over unwanted volt
level error sources with several volts of peak-to-peak

Figure 22. Input Normal Mode Rejection at f
Figure 21. Input Normal Mode Rejection at DC
–100
–110
–120
–100
–110
–120
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
0
250f
0
N
f
252f
N
INPUT SIGNAL FREQUENCY (Hz)
INPUT SIGNAL FREQUENCY (Hz)
N
2f
N
254f
3f
N
N
256f
4f
N
N
5f
258f
N
f
N
N
6f
= f
N
EOSC/5120
260f
7f
N
N
2498 F21
2498 F22
262f
8f
N
N
S
= 256 • f
N
Figure 24. Input Normal Mode Rejection vs Input Frequency with
Input Perturbation of 100% (50Hz Notch)
Figure 23. Input Normal Mode Rejection vs Input Frequency with
Input Perturbation of 100% (60Hz Notch)
Figure 25. Input Normal Mode Rejection vs Input Frequency with
Input Perturbation of 100% (50Hz/60Hz Notch)
–100
–120
–100
–120
–100
–120
–20
–40
–60
–80
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
0
0
12.5 25 37.5 50 62.5 75 87.5 100 112.5 125 137.5 150 162.5 175 187.5 200
15
20
30
40
45
60
60
75
80
90
INPUT FREQUENCY (Hz)
INPUT FREQUENCY (Hz)
INPUT FREQUENCY (Hz)
105 120 135 150 165 180 195 210 225 240
100
120
MEASURED DATA
CALCULATED DATA
MEASURED DATA
CALCULATED DATA
MEASURED DATA
CALCULATED DATA
140
160
180
V
V
V
V
T
V
V
V
V
T
V
V
V
V
T
A
A
CC
REF
IN(CM)
IN(P-P)
A
CC
REF
IN(CM)
IN(P-P)
CC
REF
IN(CM)
IN(P-P)
= 25°C
= 25°C
= 25°C
= 5V
= 5V
= 5V
= 5V
= 5V
= 5V
200
= 2.5V
= 2.5V
= 5V
= 2.5V
= 5V
= 5V
2498 F23
2498 F25
2498fe
2498 F24
220