LTC2410_09 Datasheet, PDF (1/48 Pages) Linear Technology – 24-Bit No Latency DSTM ADC with Differential Input and Differential Reference

FEATURES
s _{Differential Input and Differential Reference with}
GND to V_CC Common Mode Range
s _{2ppm INL, No Missing Codes}
s _{2.5ppm Full-Scale Error}
s _{0.1ppm Offset}
s _{0.16ppm Noise}
s _{Single Conversion Settling Time for Multiplexed}
Applications
s _{Internal Oscillator—No External Components}
Required
s _{110dB Min, 50Hz or 60Hz Notch Filter}
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 _{Fully Differential Version of LTC2400}
U
APPLICATIO S
s _{Direct Sensor Digitizer}
s _{Weight Scales}
s _{Direct Temperature Measurement}
s _{Gas Analyzers}
s _{Strain-Gage Transducers}
s _{Instrumentation}
s _{Data Acquisition}
s _{Industrial Process Control}
s _{6-Digit DVMs}
LTC2410
24-Bit No Latency ∆Σ^TM ADC
with Differential Input and
Differential Reference
DESCRIPTIO
The LTC^®2410 is a 2.7V to 5.5V micropower 24-bit
differential ∆Σ analog to digital converter with an inte-
grated 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 LTC2410 can be configured for better than
110dB input differential mode rejection at 50Hz or 60Hz
±2%, or it can be driven by an external oscillator for a user
defined rejection frequency. The internal oscillator re-
quires 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
LTC2410. The DC common mode input rejection is better
than 140dB.
The LTC2410 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 S
2.7V TO 5.5V
1µF
2
V_CC
14
F_O
REFERENCE
VOLTAGE
0.1V TO V_CC
LTC2410
3 _REF+
4 _REF–
SCK ¹³
ANALOG INPUT RANGE ⁵ _IN+
–0.5V_REF TO 0.5V_REF
6 _IN–
1, 7, 8, 9, 10, 15, 16
GND
12
SDO
11
CS
V_CC
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
3-WIRE
SPI INTERFACE
2410 TA01
BRIDGE
IMPEDANCE
100Ω TO 10k
V_{CC 1µF}
3
2
REF⁺ V_CC
12 SDO
5 _IN+
6 _IN–
LTC2410
4 _REF ^– _GND
F_O
13 SCK
11 CS
1, 7, 8
9, 10,
15, 16
14
2410 TA02
3-WIRE
SPI INTERFACE
1