LTC2494IUHF#PBF Linear Technology, LTC2494IUHF#PBF Datasheet - Page 20

• 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
LTC2494
= 1 (offset calibration disabled, multiplexing output rates
up to 15Hz with no latency). When IM = 1 (temperature
measurement), SPD, GS2, GS1, GS0 will be ignored and
the device will operate in 1x mode. The final 3 bits (GS2,
GS1, GS0) are used to select the gain. The configuration
remains valid until a new input word with EN = 1 (the first
3 bits are 101) and EN2 = 1 is shifted into the device.
Rejection Mode (FA, FB)
The LTC2494 includes a high accuracy on-chip oscillator
with no required external components. Coupled with an
integrated 4th order digital low pass filter, the LTC2494 re-
jects line frequency noise. In the default mode, the LTC2494
simultaneously rejects 50Hz and 60Hz by at least 87dB. If
more rejection is required, the LTC2494 can be configured
to reject 50Hz or 60Hz to better than 110dB.
0
Table 4. Converter Configuration
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
EN SGL ODD A2 A1 A0 EN2
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Channel
Input
Any
X
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
IM
X
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
Rejection
FA
X
X
0
0
1
1
0
0
1
1
Mode
Any
FB
X
X
0
1
0
1
0
1
0
1
Speed
SPD
Any
X
X
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
X
X
X
X
GS2 GS1 GS0
Speed Mode (SPD)
Every conversion cycle, two conversions are combined to
remove the offset (default mode). This result is free from
offset and drift. In applications where the offset is not
critical, the auto-calibration feature can be disabled with
the benefit of twice the output rate. While operating in the
2x mode (SPD = 1), the linearity and full-scale errors are
unchanged from the 1x mode performance. In both the 1x
and 2x mode there is no latency. This enables input steps
or multiplexer changes to settle in a single conversion
cycle easing system overhead and increasing the effective
conversion rate. During temperature measurements, the 1x
mode is always used independent of the value of SPD.
X
X
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
X
X
X
X
Gain
Any
X
X
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
X
X
X
X
X
X
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
X
X
X
X
Temperature Input, Simultaneous 50Hz/60Hz Rejection
External Input, Simultaneous 50Hz/60Hz Rejection
External Input, Gain = 128, Auto-Calibration
External Input, Gain = 264, Auto-Calibration
External Input, Gain = 16, Auto-Calibration
External Input, Gain = 32, Auto-Calibration
External Input, Gain = 64, Auto-Calibration
External Input, Gain = 1, Auto-Calibration
External Input, Gain = 4, Auto-Calibration
External Input, Gain = 8, Auto-Calibration
External Input, Gain = 128, 2x Speed
External Input, Gain = 16, 2x Speed
External Input, Gain = 32, 2x Speed
External Input, Gain = 64, 2x Speed
Temperature Input, 50Hz Rejection
Temperature Input, 60Hz Rejection
External Input, Gain = 1, 2x Speed
External Input, Gain = 2, 2x Speed
External Input, Gain = 4, 2x Speed
External Input, Gain = 8, 2x Speed
CONVERTER CONFIGURATION
External Input, 50Hz Rejection
External Input, 60Hz Rejection
Reserved, Do Not Use
Reserved, Do Not Use
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