LTC2411-1_15 Datasheet, PDF (1/40 Pages) Linear Technology – 24-Bit No Latency ADC with Differential Input and Reference in MSOP

LTC2411/LTC2411-1
24-Bit No Latency ∆Σ^TM ADC
with Differential Input and
Reference in MSOP
FEATURES
DESCRIPTIO
s _{24-Bit ADC in an MS10 Package}
s _{Low Supply Current (200µA in Conversion Mode}
and 4µA in Autosleep Mode)
s _{Differential Input and Differential Reference}
with GND to V_CC Common Mode Range
s _{2ppm INL, No Missing Codes}
s _{4ppm Full-Scale Error and 1ppm Offset}
s _{0.29ppm Noise}
s _{No Latency: Digital Filter Settles in a Single Cycle.}
Each Conversion Is Accurate, Even After an
Input Step
s _{Single Supply 2.7V to 5.5V Operation}
s _{Internal Oscillator—No External Components}
Required
s _{110dB Min, Pin Selectable 50Hz/60Hz Notch Filter}
(LTC2411)
s _{Simultaneous 50Hz/60Hz Rejection (LTC2411-1)}
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}
The LTC^®2411/LTC2411-1 are 2.7V to 5.5V micropower
24-bit differential ∆Σ analog-to-digital converters with an
integrated oscillator, 2ppm INL and 0.29ppm RMS noise.
They use delta-sigma technology and provide single cycle
settling time for multiplexed applications. Through a
single pin, the LTC2411 can be configured for better than
110dB differential mode rejection at 50Hz or 60Hz ±2%,
and the LTC2411-1 can provide better than 87dB input
differential mode rejection over the range of 49Hz to
61.2Hz, or they can be driven by an external oscillator for
a user-defined rejection frequency. The LTC2411 and
LTC2411-1 are identical when driven by an external
oscillator. The internal oscillator requires no external
frequency setting components.
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
LTC2411/LTC2411-1. The DC common mode input rejec-
tion is better than 140dB.
The LTC2411/LTC2411-1 communicate through a flexible
3-wire digital interface that 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
1
V_CC
10
F_O
REFERENCE
VOLTAGE
0.1V TO V_CC
LTC2411/
LTC2411-1
2 _REF+
3 _REF–
9
SCK
ANALOG INPUT RANGE
–0.5V_REF TO 0.5V_REF
4 _IN+
5 _IN–
6
GND
SDO ⁸
CS ⁷
2411 TA01
V_CC
= INTERNAL OSC/50Hz REJECTION (LTC2411)
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION (LTC2411)
= SIMULTANEOUS 50Hz/60Hz REJECTION (LTC2411-1)
3-WIRE
SPI INTERFACE
BRIDGE
IMPEDANCE
100Ω TO 10kΩ
V_{CC 1µF}
2
1
REF⁺ V_CC
4 _IN+
5 _IN–
LTC2411/
LTC2411-1
3 _REF ^– _GND
F_O
6
10
9 SCK
8 SDO
7 CS
3-WIRE
SPI
INTERFACE
2411 TA02
1