LTC2494IUHF#PBF Linear Technology, LTC2494IUHF#PBF Datasheet - Page 31

• Manufacturer Part Number: LTC2494IUHF#PBF
• Description: IC ADC 16BIT W/PGA 38-QFN
• Manufacturer: Linear Technology

Specifications of LTC2494IUHF#PBF

• Number Of Bits: 16
• Sampling Rate (per Second): 15
• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

applications inForMation
100pF up to 10k will not degrade the performance) (see
Figures 14, 15).
In cases where large bypass capacitors are required
on the reference inputs (C
linearity errors are proportional to the value of the refer-
ence resistance. Every ohm of reference resistance pro-
duces a full-scale error of approximately 0.5ppm (while
operating in simultaneous 50Hz/60Hz mode) (see Figures
16 and 17). If the input common mode voltage is equal to
the reference common mode voltage, a linearity error of
approximately 0.67ppm per 100Ω of reference resistance
results (see Figure 18). In applications where the input
and reference common mode voltages are different, the
errors increase. A 1V difference in between common mode
input and common mode reference results in a 6.7ppm
INL error for every 100Ω of reference resistance.
Figure 15. –FS Error vs R
Figure 14. +FS Error vs R
–10
–10
–20
–30
–40
–50
–60
–70
–80
–90
90
80
70
60
50
40
30
20
10
10
0
0
0
0
V
V
V
V
f
T
V
V
V
V
f
T
O
O
A
A
CC
REF
IN
IN
CC
REF
IN
IN
= GND
= GND
= 25°C
= 25°C
+
–
+
–
C
= 5V
= 5V
= 3.75V
= 1.25V
= 1.25V
= 3.75V
= 5V
= 5V
C
REF
C
C
10
REF
C
10
REF
REF
C
REF
C
REF
= 0.001µF
REF
C
= 0.01µF
= 0.001µF
= 100pF
REF
= 0.01µF
= 100pF
= 0pF
= 0pF
100
R
100
R
SOURCE
SOURCE
SOURCE
SOURCE
REF
( )
( )
1k
1k
> 0.01µF) full-scale and
at V
at V
10k
10k
REF
REF
(Small C
(Small C
2494 F14
2494 F15
100k
100k
REF
REF
)
)
Figure 16. +FS Error vs R
Figure 17. –FS Error vs R
Figure 18. INL vs Differential Input Voltage and
Reference Source Resistance for C
–400
–100
–200
–300
–500
100
–10
500
400
300
200
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
A
A
CC
REF
IN(CM)
REF
CC
REF
IN
IN
= GND
= GND
= 25°C
= 25°C
= 25°C
+
–
+
–
C
= 5V
= 5V
= 5V
= 1.25V
= 3.75V
= 3.75V
= 1.25V
= 5V
REF
= 5V
= 10µF
= 5V
–0.3
200
200
= 2.5V
= 1µF , 10µF
–0.1
400
R
400
R
V
SOURCE
SOURCE
IN
/V
SOURCE
SOURCE
REF
C
REF
600
( )
600
0.1
( )
(V)
= 1µF , 10µF
C
at V
at V
C
REF
R = 500
R = 100
REF
C
C
R = 1k
REF
REF
800
800
= 0.01µF
0.3
REF
= 0.01µF
REF
= 0.1µF
= 0.1µF
REF
LTC2494
(Large C
(Large C
2494 F18
2494 F16
2494 F17
1000
> 1µF
1000
0.5
REF
REF

)
)
2494fd