LTC2436-1IGN Linear Technology, LTC2436-1IGN Datasheet - Page 23

• Manufacturer Part Number: LTC2436-1IGN
• Description: IC CONV A/D 16B 2CH DIFF 16SSOP
• Manufacturer: Linear Technology

Specifications of LTC2436-1IGN

• Number Of Bits: 16
• Sampling Rate (per Second): 6.8
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 1mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP (0.150", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIO S I FOR ATIO
Larger values of reference capacitors (C
be required as reference filters in certain configurations.
Such capacitors will average the reference sampling charge
and the external source resistance will see a quasi con-
stant reference differential impedance. When F
(internal oscillator and 50Hz/60Hz notch), the typical
differential reference resistance is 1.4M which will gen-
erate a gain error of approximately 1LSB full scale for each
40 of source resistance driving REF
is driven by an external oscillator with a frequency f
(external conversion clock operation), the typical differen-
tial reference resistance is 0.20 • 10
ohm of source resistance drving REF
in 1.54 • 10
Figure 21. +FS Error vs R
Figure 19. +FS Error vs R
–3
–1
–2
11
17
22
30
–7
0
0
6
1
0 100 200 300 400 500 600 700 800 900 1000
• f
V
REF
REF
IN
IN
F
T
V
REF
REF
IN
IN
F
T
O
A
CC
O
A
CC
+
–
EOSC
= GND
= 25 C
+
–
= GND
= 25 C
+
–
= 5V
= 5V
= 2.5V
+
–
= 3.75V
= 5V
= 1.25V
= 5V
= GND
C
= 5V
= GND
10
REF
C
U
REF
C
LSB gain error at full scale. The effect
C
REF
= 0.001 F
REF
= 100pF
SOURCE
= 0.01 F
R
= 0pF
100
R
SOURCE
SOURCE
SOURCE
U
C
at REF
REF
( )
( )
1k
at REF
C
= 1 F, 10 F
C
REF
REF
W
+
= 0.01 F
10k
= 0.1 F
+
and REF
12
+
+
or REF
or REF
/f
or REF
24361 F19
REF
24361 F21
EOSC
100k
> 0.01 F) may
–
–
(Small C
(Large C
–
–
U
. When F
will result
O
and each
= LOW
EOSC
IN
REF
)
)
O
of the source resistance on the two reference pins is
additive with respect to this gain error. The typical +FS and
–FS errors for various combinations of source resistance
seen by the REF
C
21 and 22.
In addition to this gain error, the converter INL perfor-
mance is degraded by the reference source impedance.
When F
every 1000 of source resistance driving REF
translates into about 1LSB additional INL error. When F
is driven by an external oscillator with a frequency f
every 100
Figure 22. –FS Error vs R
REF
Figure 20. –FS Error vs R
connected to these pins are shown in Figures 19, 20,
O
= LOW (internal oscillator and 50Hz/60Hz notch),
30
22
17
11
3
2
1
0
6
0
1
of source resistance driving REF
0 100 200 300 400 500 600 700 800 900 1000
V
REF
REF
IN
IN
F
T
V
REF
REF
IN
IN
F
T
O
A
CC
O
A
CC
+
–
= GND
= 25 C
+
–
+
= GND
= 25 C
+
–
= GND
= 2.5V
= 5V
+
–
= 1.25V
= 5V
= 3.75V
= 5V
and REF
C
= GND
= 5V
= GND
10
REF
C
C
REF
REF
C
= 0.001 F
REF
= 100pF
= 0.01 F
SOURCE
100
R
= 0pF
R
SOURCE
SOURCE
SOURCE
–
pins and external capacitance
C
REF
at REF
( )
1k
( )
C
at REF
REF
= 1 F, 10 F
C
REF
= 0.01 F
+
LTC2436-1
10k
+
= 0.1 F
and REF
or REF
2412 F19
24361 F22
100k
–
–
(Small C
(Large C
+
+
or REF
or REF
23
EOSC
IN
REF
24361f
)
)
O
–
–
,