LTC2498IUHF#PBF Linear Technology, LTC2498IUHF#PBF Datasheet - Page 31

• 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
Figure 18. INL vs Differential Input Voltage and Reference
Source Resistance for C
Figure 16. +FS Error vs R
Figure 17. –FS Error vs R
–100
–300
–400
–500
–200
500
400
200
100
300
–10
10
–2
–4
–6
–8
0
8
6
4
2
0
0
–0.5
0
0
V
V
V
V
f
T
V
V
V
T
C
V
V
V
V
f
T
O
O
A
CC
REF
IN
IN
CC
REF
IN(CM)
A
REF
CC
REF
IN
IN
A
= GND
= GND
= 25°C
= 25°C
+
–
= 25°C
+
–
= 5V
C
= 5V
= 5V
= 3.75V
= 1.25V
= 1.25V
= 3.75V
= 5V
= 5V
= 10µF
= 5V
REF
200
–0.3
200
= 2.5V
= 1µF , 10µF
REF
–0.1
400
R
400
R
V
SOURCE
SOURCE
IN
/V
> 1µF
SOURCE
SOURCE
REF
C
REF
600
( )
600
( )
0.1
(V)
= 1µF , 10µF
C
at V
at V
C
R = 500
R = 100
REF
REF
C
C
R = 1k
REF
REF
800
800
0.3
= 0.01µF
REF
REF
= 0.01µF
= 0.1µF
= 0.1µF
(Large C
(Large C
2498 F18
2498 F16
1000
1000
2498 F17
0.5
REF
REF
)
)
The SINC
rejection at all frequencies except DC and integer multiples
of the modulator sampling frequency (f
and 20. The modulator sampling frequency is f
15,360Hz while operating with its internal oscillator and
f
of frequency F
When using the internal oscillator, the LTC2498 is designed
to reject line frequencies. As shown in Figure 21, rejec-
tion nulls occur at multiples of frequency f
determined by the input control bits FA and FB (f
or 60Hz or 55Hz for simultaneous rejection). Multiples of
the modulator sampling rate (f
S
= F
Figure 19. Input Normal Mode Rejection, Internal Oscillator
and 50Hz Rejection Mode
Figure 20. Input Normal Mode Rejection, Internal Oscillator
and 60Hz Rejection Mode
EOSC
4
/20 when operating with an external oscillator
digital filter provides excellent normal mode
–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
EOSC
0 f
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
S
f
S
.
2f
2f
S
S
3f
S
3f
4f
S
S
4f
5f
S
S
S
6f
5f
= f
S
S
7f
6f
N
S
S
• 256) only reject noise
8f
7f
S
S
9f
S
8f
S
LTC2498
10f
S
), see Figures 19
S
11f
9f
2498 F19
2498 F20
N
S
S
, where f
12f
10f
S
S
N

= 50Hz
2498fe
S
N
is
=