Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Thermal Characteristics
(Note 1)
TSSOP
Junction-to-Ambient Thermal Resistance (θ
JA
) ........110°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ...............30°C/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial.
Recommended DC Operating Conditions
(T
A
= -55°C to +125°C, unless otherwise noted.)(Notes 2 and 4)
PARAMETER
Power-Supply Voltage
AVDD-DVDD
Cable Resistance
Input Logic 0
Input Logic 1
R
CABLE
V
IL
V
IH
2.1
Per lead
SYMBOL
V
AVDD
,
V
DVDD
CONDITIONS
MIN
3.0
-100
TYP
3.3
MAX
3.6
+100
40
0.8
UNITS
V
mV
kΩ
V
V
Electrical Characteristics
PARAMETER
Supply Current
Thermocouple Temperature
Resolution
Cold-Junction Temperature Data
Resolution
(3.0V
≤
V
DD
≤
3.6V, T
A
= -55°C to +125°C, unless otherwise noted.)(Notes 2, 3, and 4)
SYMBOL
I
DD
Standby
Active conversion
CONDITIONS
MIN
TYP
5.25
1.2
19
0.0078125
0.015625
T
A
= +25°C
Thermocouple Input Bias Current
I
TCBIAS
T
A
= -40°C to +85°C
T
A
= -55°C to +105°C
T
A
= -55°C to +125°C
-10
-10
-20
-20
+10
+65
+110
+400
nA
MAX
10
2
UNITS
µA
mA
Bits
°C
°C
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Maxim Integrated
│
2
MAX31856
Precision Thermocouple to Digital Converter
with Linearization
Electrical Characteristics (continued)
PARAMETER
Thermocouple Input Differential
Bias Current (Note 4)
SYMBOL
(3.0V ≤ V
DD
≤ 3.6V, T
A
= -55°C to +125°C, unless otherwise noted.)(Notes 2, 3, and 4)
CONDITIONS
T
A
= +25°C
I
TCIDBIAS
T
A
= -40°C to +85°C
T
A
= -55°C to +105°C
T
A
= -55°C to +125°C
Input-Referred Noise
Power-Supply Rejection
Power-On-Reset Voltage
Threshold
Power-On-Reset Voltage
Hysteresis
Bias Voltage
BIAS Output Resistance
Input Common-Mode Range
T
A
= +25°C
T
A
= -20°C to +85°C
Full-Scale and INL Error (Note 6)
T
A
= -40°C to +105°C
T
A
= -40°C to +125°C
T
A
= -55°C to +125°C
T
A
= +25°C
Input Offset Voltage (Note 7)
T
A
= -20°C to +85°C
T
A
= -40°C to +105°C
T
A
= -55°C to +125°C
T
A
= +25°C
AV = 8
Input Offset Voltage
AV = 32
T
A
= -20°C to +85°C
T
A
= -40°C to +105°C
T
A
= -55°C to +125°C
T
A
= +25°C
T
A
= -20°C to +85°C
T
A
= -40°C to +105°C
T
A
= -55°C to +125°C
T
A
= -20°C to +85°C
Cold-Junction Temperature Error
Overvoltage Rising Threshold
(Note 8)
Overvoltage Hysteresis
T
A
= -40°C to +105°C
T
A
= -55°C to +125°C
V
N
PSR
V
POR
V
HYST
V
BIAS
R
BIAS
0.5
-0.05
-0.15
-0.2
-0.3
-0.35
-0.01
-0.015
-0.017
-0.02
-7.8
-11.7
-13.3
-15.6
-2.0
-2.9
-3.3
-3.9
-0.7
-1
-2
V
AVDD
–
0.1
V
AVDD
+
0.17
0.09
AV = 8
AV = 32
Cold-junction sensor
-4
-5.5
-10
1.3
0.4
0.15
2.7
0.1
0.735
2
1.4
+0.05
+0.15
+0.2
+0.3
+0.35
+0.01
+0.015
+0.017
+0.02
+7.8
+11.7
+13.3
+15.6
+2.0
+2.9
+3.3
+3.9
+0.7
+1
+2
V
AVDD
+ 0.35
V
V
°C
µV
%FS
%FS
2.85
MIN
TYP
±0.2
+4
+5.5
+10
µV
RMS
°C/V
V
V
V
kΩ
V
nA
MAX
UNITS
www.maximintegrated.com
Maxim Integrated
│
3
MAX31856
Precision Thermocouple to Digital Converter
with Linearization
Electrical Characteristics (continued)
PARAMETER
Undervoltage Falling Edge
Threshold (Note 8)
Undervoltage Hysteresis
SYMBOL
(3.0V ≤ V
DD
≤ 3.6V, T
A
= -55°C to +125°C, unless otherwise noted.)(Notes 2, 3, and 4)
CONDITIONS
MIN
-0.3
TYP
-0.17
0.09
Type B,
T
A
= 0 to 125°C,
T
TC
= 95°C to +1798°C
Type E,
T
A
= -55°C to +125°C
T
TC
= -200°C to +1000°C
Type J,
T
A
= -55°C to +125°C
T
TC
= -210°C to +1200°C
Type K,
T
A
= -55°C to +125°C
T
TC
= -200°C to +1372°C
Type N,
T
A
= -55°C to +125°C
T
TC
= -200°C to +1300°C
Type R,
T
A
= -50°C to +125°C
T
TC
= -50°C to +1768°C
Type S,
T
A
= -50°C to +125°C
T
TC
= -50°C to +1768°C
Type T,
T
A
= -55°C to +125°C
T
TC
= -200°C to +400°C
1-Shot conversion or first
conversion in auto-conversion
mode (60Hz)
1-Shot conversion or first
conversion in auto-conversion
mode (50Hz)
Auto conversion mode,
conversions 2 through n (60Hz)
Auto conversion mode,
conversions 2 through n (50Hz)
-0.24
+0.25
MAX
0
UNITS
V
V
-0.14
+0.06
-0.11
+0.10
-0.13
+0.12
°C
Thermocouple Linearity
Correction Error
-0.09
+0.08
-0.19
+0.17
-0.16
+0.20
-0.07
+0.07
143
155
Temperature Conversion Time
(Thermocouple + Cold Junction)
t
CONV
169
185
ms
82
98
90
110
www.maximintegrated.com
Maxim Integrated
│
4
MAX31856
Precision Thermocouple to Digital Converter
with Linearization
Electrical Characteristics (continued)
PARAMETER
Common-Mode Rejection
50/60Hz Noise Rejection
SERIAL INTERFACE
Input Leakage Current
Output High Voltage
Output Low Voltage
Input Capacitance
Serial Clock Frequency
SCK Pulse High Width
SCK Pulse Low Width
SCK Rise and Fall Time
CS
Fall to SCK Rise
SCK to
CS
Hold
CS
Rise to Output Disable
Data to SCLK Setup
SCLK to Data Hold
SCK Fall to Output Data Valid
CS
Inactive Time
I
LEAK
V
OH
V
OL
C
IN
f
SCL
t
CH
t
CL
t
R
, t
F
t
CC
t
CCH
t
CDZ
t
DC
t
CDH
t
CDD
t
CWH
SYMBOL
CMR
(3.0V ≤ V
DD
≤ 3.6V, T
A
= -55°C to +125°C, unless otherwise noted.)(Notes 2, 3, and 4)
CONDITIONS
0.5V ≤ V
CM
≤ 1.4V
Fundamental and harmonics
(Note 5)
I
OUT
= -1.6mA
I
OUT
= 1.6mA
8
5
100
100
C
L
= 10pF
C
L
= 10pF
C
L
= 10pF
C
L
= 10pF
35
35
C
L
= 10pF
(Note 3)
400
80
100
100
40
200
-1
V
CC
- 0.4
0.4
MIN
TYP
70
91
+1
MAX
UNITS
dB
dB
µA
V
V
pF
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note 2:
All voltages are referenced to GND. Currents entering the IC are specified positive, and currents exiting the IC are negative.
Note 3:
All Serial Interface timing specifications are guaranteed by design.
Note 4:
Specification is 100% tested at T
A
= +25°C. Specification limits over temperature (T
A
= T
MIN
to T
MAX
) are guaranteed by
design and characterization; not production tested.
Note 5:
For all pins except T+ and T- (see the Thermocouple Input Bias Current parameter in the
Electrical Characteristics
table.
Note 6:
Using a common-mode voltage other than V
BIAS
will change this specification. See the
Typical Operating Characteristics
for details.
Note 7:
Input-referred full-scale voltage is 78.125mV when AV = 8 and is 19.531mV when AV = 32.
Note 8:
Overvoltage and undervoltage limits apply to T+, T-, and BIAS pins.
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