LTC2498IUHF#PBF Linear Technology, LTC2498IUHF#PBF Datasheet - Page 21

• 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
Slope calibration is not required if the reference volt-
age (V
LSBs
code (DATAOUT
formula:
If a different value of V
is:
If the value of V
measuring the temperature sensor at a known temperature
T
This value of slope can be used to calculate further tem-
perature readings using:
N
T
SLOPE = DATAOUT
T
(in °K) and using the following formula:
T
K
K
K
Figure 4. Internal PTAT Digital Output vs Temperature
24
= DATAOUT
= DATAOUT
=
REF
/°C. The temperature is calculated from the output
DATAOUT
) is known. A 5V reference has a slope of 314
140000
120000
100000
80000
60000
40000
20000
0
REF
1570
0
24
V
V
SLOPE = 314 LSB
24
24
CC
REF
) for a 5V reference using the following
is not known, the slope is determined by
24
= 5V
/314 in Kelvin
/SLOPE
= 5V
• V
Table 5. LTC2498 Interface Timing Modes
CONFIGURATION
External SCK, Single Cycle
Conversion
External SCK, 3-Wire I/O
Internal SCK, Single Cycle
Conversion
Internal SCK, 3-Wire I/O,
Continuous Conversion
REF
24
100
REF
/T
TEMPERATURE (°K)
is used, the temperature output
N
24
in Kelvin
/K
200
300
2498 F04
400
SOURCE
External
External
Internal
Internal
SCK
CYCLE CONTROL
CONVERSION
CS and SCK
Continuous
CS↓
SCK
All Kelvin temperature readings can be converted to T
(°C) using the fundamental equation:
SERIAL INTERFACE TIMING MODES
The LTC2498’s 4-wire interface is SPI and MICROWIRE
compatible. This interface offers several flexible modes
of operation. These include internal/external serial clock,
3- or 4-wire I/O, single cycle or continuous conversion. The
following sections describe each of these timing modes
in detail. In all cases, the converter can use the internal
oscillator (f
connected to the f
data input format, data output format, and performance
remain the same. Refer to Table 5 for a summary.
T
C
= T
DATA OUTPUT
CS and SCK
K
CONTROL
Internal
– 273
O
SCK
CS↓
–1
–2
–3
–4
–5
Figure 5. Absolute Temperature Error
= LOW or f
5
4
3
2
1
0
–55
O
–30
pin. For each mode, the operating cycle,
CONNECTION AND
–5
WAVEFORMS
Figures 9, 10
Figures 6, 7
TEMPERATURE (°C)
O
Figure 11
Figure 8
= HIGH) or an external oscillator
20
45
70
95
LTC2498
2498 F05
120

2498fe
C