LTC2413 Datasheet, PDF (1/44 Pages) Linear Technology – 24-Bit No Latency ADC, with Simultaneous 50Hz/60Hz Rejection

LTC2413
24-Bit No Latency ∆Σ^TM ADC,
with Simultaneous 50Hz/60Hz Rejection
FEATURES
s _{Simultaneous 50Hz/60Hz Rejection}
(87dB Minimum)
s _{Differential Input and Differential Reference with}
GND to V_CC Common Mode Range
s _{2ppm INL and No Missing Codes at 24 Bits}
s _{0.1ppm Offset and 2.5ppm Full-Scale Error}
s _{0.16ppm Noise}
s _{No Latency: Digital Filter Settles in a Single Cycle.}
s _{Internal Oscillator—No External Components}
Required
s _{24-Bit ADC in Narrow SSOP-16 Package}
(SO-8 Footprint)
s _{Single Supply 2.7V to 5.5V Operation}
s _{Low Supply Current (200µA) and Auto Shutdown}
s _{Pin Compatible with LTC2410}
U
APPLICATIO S
s _{Direct Sensor Digitizer}
s _{Weight Scales}
s _{Direct Temperature Measurement}
s _{Gas Analyzers}
s _{Strain-Gauge Transducers}
s _{Instrumentation}
s _{Data Acquisition}
s _{Industrial Process Control}
s _{6-Digit DVMs}
s _{Products for International Markets}
DESCRIPTIO
The LTC^®2413 is a 2.7V to 5.5V simultaneous 50Hz/60Hz
rejection micropower 24-bit differential ∆Σ analog to
digital converter with an integrated oscillator, 2ppm INL
and 0.16ppm RMS noise. It uses delta-sigma technology
and provides single cycle settling time for multiplexed
applications. Through a single pin, the LTC2413 can be
configured for better than 87dB input differential mode
rejection over the range of 49Hz to 61.2Hz (50Hz and
60Hz ±2% simultaneously), or it can be driven by an
external oscillator for a user defined rejection frequency.
The internal oscillator requires no external frequency
setting components.
The converter accepts any external differential reference
voltage from 0.1V to V_CC for flexible ratiometric and
remote sensing measurement configurations. The full-
scale differential input range is from – 0.5V_REF to 0.5V_REF.
The reference common mode voltage, V_REFCM, and the
input common mode voltage, V_INCM, may be indepen-
dently set anywhere within the GND to V_CC range of the
LTC2413. The DC common mode input rejection is better
than 140dB.
The LTC2413 communicates through a flexible 3-wire
digital interface which is compatible with SPI and
MICROWIRE^TM protocols.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No Latency ∆Σ is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
TYPICAL APPLICATIO
2.7V TO 5.5V
1µF
2
V_CC
14
F_O
REFERENCE
VOLTAGE
0.1V TO V_CC
LTC2413
3 _REF+
4 _REF–
13
SCK
ANALOG INPUT RANGE
–0.5V_REF TO 0.5V_REF
5 _IN+
6 _IN–
1, 7, 8, 9, 10, 15, 16
GND
SDO ¹²
CS ¹¹
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/
SIMULTANEOUS 50Hz/60Hz REJECTION
3-WIRE
SPI INTERFACE
2413 TA01
Measured Noise Rejection from 48Hz to 62.5Hz
–80
–85
–90
–95
–100
–105
MEASURED DATA
CALCULATED DATA
V_CC = 5V
REF⁺ = 5V
REF ^– = GND
V_INCM = 2.5V
V_IN(P-P) = 5V
T_A = 25°C
–110
–115
–120
48
50 52 54 56 58 60 62
INPUT FREQUENCY (Hz)
2413 TA02
sn2413 2413fs
1