Direct ADC Measurements .................................................................................................................................... 55
Global Configuration Register ............................................................................................................................... 59
LTC2983C .................................................0ºC to 70ºC
LTC2983I ............................................. –40ºC to 85ºC
V
REFOUT
V
REFP
GND
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
CH9
48
47
46
45
44
43
42
41
40
39
38
37
Q1
Q2
Q3
V
DD
GND
LDO
RESET
CS
SDI
SDO
SCK
INTERRUPT
LX PACKAGE
48-LEAD (7mm
×
7mm) PLASTIC LQFP
T
JMAX
= 150°C,
θ
JA
= 57°C/W
orDer inForMaTion
LEAD FREE FINISH
LTC2983CLX#PBF
LTC2983ILX#PBF
TRAY
LTC2983CLX#PBF
LTC2983ILX#PBF
PART MARKING*
LTC2983
LTC2983
PACKAGE DESCRIPTION
48-Lead (7mm
×
7mm) LQFP
48-Lead (7mm
×
7mm) LQFP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Supply Voltage
Supply Current
Sleep Current
Input Range
Output Rate
Output Rate
Input Common Mode Rejection
Input Normal Mode Rejection
All Analog Input Channels
Two Conversion Cycle Mode (Notes 6, 9)
Three Conversion Cycle Mode (Notes 6, 9)
50Hz/60Hz (Note 4)
60Hz (Notes 4, 7)
CONDITIONS
l
l
l
l
l
l
l
l
coMpleTe sysTeM elecTrical characTerisTics
MIN
2.85
CH10
CH11
CH12
CH13
CH14
CH15
CH16
CH17
CH18
CH19
CH20
COM
25
26
27
28
29
30
31
32
33
34
35
36
The
l
denotes the specifications
TYP
15
25
MAX
5.25
20
60
V
DD
– 0.3
164
246
170
255
UNITS
V
mA
µA
V
ms
ms
dB
dB
–0.05
150
225
120
120
2983fa
For more information
www.linear.com/LTC2983
3
LTC2983
coMpleTe sysTeM elecTrical characTerisTics
PARAMETER
Input Normal Mode Rejection
Input Normal Mode Rejection
Power-On Reset Threshold
Analog Power-Up
Digital Initialization
(Note 11)
(Note 12)
l
l
which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
CONDITIONS
50Hz (Notes 4, 8)
50Hz/60Hz (Notes 4, 6, 9)
l
l
The
l
denotes the specifications
TYP
MAX
UNITS
dB
dB
2.25
100
100
V
ms
ms
MIN
120
75
The
l
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Resolution (No Missing Codes)
Integral Nonlinearity
Offset Error
Offset Error Drift
Positive Full-Scale Error
Positive Full-Scale Drift
Input Leakage
Negative Full-Scale Error
Negative Full-Scale Drift
Output Noise
Common Mode Input Range
RTD Excitation Current
RTD Excitation Current Matching
Thermistor Excitation Current
(Note 16)
Continuously Calibrated
(Note 16)
(Note 4)
(Notes 3, 15)
(Notes 3, 15)
(Note 18)
(Notes 3, 15)
(Notes 3, 15)
(Note 5)
CONDITIONS
–F
S
≤ V
IN
≤ + F
S
V
IN(CM)
= 1.25V (Note 15)
l
l
l
l
l
l
l
l
l
l
l
l
l
l
aDc elecTrical characTerisTics
MIN
24
TYP
2
0.5
10
0.1
MAX
30
2
20
100
0.5
1
100
UNITS
Bits
ppm of V
REF
µV
nV/°C
ppm of V
REF
ppm of V
REF
/°C
nA
ppm of V
REF
ppm of V
REF
/°C
µV
RMS
V
%
%
0.1
0.8
–0.05
–25
–37.5
Table 30
Table 53
0.5
1.5
V
DD
– 0.3
25
37.5
Error within Noise Level of ADC
reFerence elecTrical characTerisTics
PARAMETER
Output Voltage
Output Voltage Temperature Coefficient
Output Voltage Temperature Coefficient
Line Regulation
Load Regulation
Output Voltage Noise
Output Short-Circuit Current
Turn-On Time
Long Term Drift of Output Voltage (Note 13)
Hysteresis (Note 14)
∆T = 0°C to 70°C
∆T = –40°C to 85°C
I
OUT(SOURCE)
= 100µA
I
OUT(SINK)
= 100µA
0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
Short V
REFOUT
to GND
Short V
REFOUT
to V
DD
0.1% Setting, C
LOAD
= 1µF
CONDITIONS
V
REFOUT
(Note 10)
I-Grade
C-Grade
the full operating temperature range, otherwise specifications are at T
A
= 25°C.
The
l
denotes the specifications which apply over
MIN
2.49
l
l
l
l
l
TYP
3
3
MAX
2.51
15
20
10
5
5
UNITS
V
ppm/°C
ppm/°C
ppm/V
mV/mA
mV/mA
µV
P-P
µV
P-P
mA
mA
µs
ppm/√khr
ppm
ppm
2983fa
4
4.5
40
30
115
60
30
70
4
For more information
www.linear.com/LTC2983
LTC2983
full operating temperature range, otherwise specifications are at T
A
= 25°C.
SYMBOL
PARAMETER
External SCK Frequency Range
External SCK LOW Period
External SCK HIGH Period
t
1
t
2
t
3
t
4
t
5
t
6
t
7
CS↓
to SDO Valid
CS↑
to SDO Hi-Z
CS↓
to SCK↑
SCK↓ to SDO Valid
SDO Hold After SCK↓
SDI Setup Before SCK↑
SDI HOLD After SCK↑
High Level Input Voltage
Low Level Input Voltage
Digital Input Current
Digital Input Capacitance
LOW Level Output Voltage (SDO, INTERRUPT)
High Level Output Voltage (SDO, INTERRUPT)
Hi-Z Output Leakage (SDO)
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All voltage values are with respect to GND.
Note 3:
Full scale ADC error. Measurements do not include reference error.
Note 4:
Guaranteed by design, not subject to test.
Note 5:
The output noise includes the contribution of internal calibration
operations.
Note 6:
MUX configuration delay = default 1ms
Note 7:
Global configuration set to 60Hz rejection.
Note 8:
Global configuration set to 50Hz rejection.
Note 9:
Global configuration default 50Hz/60Hz rejection.
Note 10:
The exact value of V
REF
is stored in the LTC2983 and used
for all measurement calculations. Temperature coefficient is measured
by dividing the maximum change in output voltage by the specified
temperature range.
Note 11:
Analog power-up. Command status register inaccessible during
this time.
Note 12:
Digital initialization. Begins at the conclusion of Analog Power-
Up. Command status register is 0
×
80 at the beginning of digital
initialization and 0
×
40 at the conclusion.
Note 13:
Long-term stability typically has a logarithmic characteristic
and therefore, changes after 1000 hours tend to be much smaller than
before that time. Total drift in the second thousand hours is normally less
CS,
SDI, SCK,
RESET
CS,
SDI, SCK,
RESET
CS,
SDI, SCK,
RESET
CS,
SDI, SCK,
RESET
I
O
= –800µA
I
O
= 1.6mA
l
l
l
DigiTal inpuTs anD DigiTal ouTpuTs
CONDITIONS
The
l
denotes the specifications which apply over the
MIN
l
l
l
l
l
l
l
l
l
l
l
l
l
TYP
MAX
2
UNITS
MHz
ns
ns
0
250
250
0
0
100
200
200
225
ns
ns
ns
ns
ns
ns
ns
V
10
100
100
V
DD
– 0.5
0.5
–10
10
0.4
V
DD
– 0.5
–10
10
10
V
µA
pF
V
V
µA
than one third that of the first thousand hours with a continuing trend
toward reduced drift with time. Long-term stability will also be affected by
differential stresses between the IC and the board material created during
board assembly.
Note 14:
Hysteresis in output voltage is created by package stress
that differs depending on whether the IC was previously at a higher or
lower temperature. Output voltage is always measured at 25°C, but
the IC is cycled to the hot or cold temperature limit before successive
measurements. Hysteresis measures the maximum output change for the
averages of three hot or cold temperature cycles. For instruments that
are stored at well controlled temperatures (within 20 or 30 degrees of
operational temperature), it is usually not a dominant error source. Typical
hysteresis is the worst-case of 25°C to cold to 25°C or 25°C to hot to
25°C, preconditioned by one thermal cycle.
Note 15:
Differential Input Range is ±V
REF
/2.
Note 16:
RTD and thermistor measurements are made ratiometrically.
As a result current source excitation variation does not affect absolute
accuracy. Choose an excitation current such that largest sensor or R
SENSE
resistance value, when driven by the nominal excitation current, will drop
1V or less. The extended ADC input range will accommodate variation in
excitation current and the ratiometric calculation will negate the absolute
value of the excitation current.
Note 17:
Do not apply voltage or current sources to these pins. They must
be connected to capacitive loads only, otherwise permanent damage may
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