LTC2415-1_15 Datasheet, PDF (1/40 Pages) Linear Technology – 24-Bit No Latency ADCs with Differential Input and Differential Reference

LTC2415/LTC2415-1
24-Bit No Latency ∆Σ^TM
ADCs with Differential Input and
Differential Reference
FEATURES
s _{2× Speed Up Version of the LTC2410/LTC2413:}
15Hz Output Rate, 50Hz or 60Hz Notch—LTC2415;
13.75Hz Output Rate, Simultaneous 50Hz/60Hz
Notch—LTC2415-1
s _{Differential Input and Differential Reference with}
GND to V_CC Common Mode Range
s _{2ppm INL, No Missing Codes}
s _{2.5ppm Gain Error}
s _{0.23ppm Noise}
s _{Single Conversion Settling Time for Multiplexed}
Applications
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}
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}
DESCRIPTIO
The LTC^®2415/2415-1 are micropower 24-bit differential
∆Σ analog to digital converters with integrated oscillator,
2ppm INL, 0.23ppm RMS noise and a 2.7V to 5.5V supply
range. They use delta-sigma technology and provide
single cycle settling time for multiplexed applications.
Through a single pin, the LTC2415 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
LTC2415-1 can be configured for better than 87dB input
differential mode rejection over the range of 49Hz to
61.2Hz (50Hz and 60Hz ±2% simultaneously). The inter-
nal oscillator requires no external frequency setting com-
ponents.
The converters accept 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
LTC2415/LTC2415-1. The DC common mode input rejec-
tion is better than 140dB.
The LTC2415/LTC2415-1 communicate 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
REFERENCE
VOLTAGE
0.1V TO V_CC
2
V_CC
14
F_O
LTC2415/
LTC2415-1
3 _REF+
4 _REF–
SCK ¹³
ANALOG INPUT RANGE
–0.5V_REF TO 0.5V_REF
5 _IN+
6 _IN–
1, 7, 8, 9, 10, 15, 16
GND
12
SDO
11
CS
V_CC
= INTERNAL OSC/50Hz REJECTION (LTC2415)
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION (LTC2415)
= INTERNAL 50Hz/60Hz REJECTION (LTC2415-1)
3-WIRE
SPI INTERFACE
2415 TA01
BRIDGE
IMPEDANCE
100Ω TO 10k
V_{CC 1µF}
3
2
REF⁺ V_CC
12 SDO
5 _IN+
6 _IN–
LTC2415/
LTC2415-1
4 _REF ^– _GND
F_O
13 SCK
11 CS
1, 7, 8
9, 10,
15, 16
14
2415 TA02
3-WIRE
SPI INTERFACE
sn2415 24151fs
1