Datasheet LTC2436-1 (Analog Devices)

LTC2436-1 2-Channel Differential Input 16-Bit No Latency ∆Σ ADC
U FEATURES DESCRIPTIO
■
2-Channel Differential Input with Automatic
The LTC®2436-1 is a 2-channel differential input mi-
Channel Selection (Ping-Pong)
cropower 16-bit No Latency ∆ΣTM analog-to-digital con- ■
Low Supply Current: 200
µ
A, 4
µ
A in Autosleep
verter with an integrated oscillator. It provides 0.5LSB ■
Differential Input and Differential Reference with
INL and 800nV RMS noise independent of VREF. The two
GND to V
differential channels convert alternately with a channel
CC Common Mode Range
■
0.12LSB INL, No Missing Codes
identification included in the conversion result. It uses ■
0.16LSB Full-Scale Error and 0.006LSB Offset
delta-sigma technology and provides single conversion ■
800nV RMS Noise, Independent of V
settling of the digital filter. Through a single pin, the
REF
■ No Latency: Digital Filter Settles in a Single Cycle and LTC2436-1 can be configured for better than 87dB input Each Channel Conversion is Accurate differential mode rejection at 50Hz and 60Hz ±2%, or it ■ Internal Oscillator—No External Components can be driven by an external oscillator for a user defined Required rejection frequency. The internal oscillator requires no ■ 87dB Min, 50Hz and 60Hz Notch Filter external frequency setting components. ■ Narrow SSOP-16 Package The converter accepts any external differential reference ■ Single Supply 2.7V to 5.5V Operation voltage from 0.1V to VCC for flexible ratiometric and ■ Pin Compatible with the 24-Bit LTC2412 remote sensing measurement configurations. The full-
U
scale differential input range is from – 0.5 •␣ VREF to 0.5 •
APPLICATIO S
VREF. The reference common mode voltage, VREFCM, and the input common mode voltage, VINCM, may be indepen- ■ Direct Sensor Digitizer dently set anywhere between GND and VCC. The DC ■ Weight Scales common mode input rejection is better than 140dB. ■ Direct Temperature Measurement ■ Gas Analyzers The LTC2436-1 communicates through a flexible 3-wire ■ digital interface which is compatible with SPI and Strain-Gage Transducers ■ Instrumentation MICROWIRETM protocols. ■ Data Acquisition , LTC and LT are registered trademarks of Linear Technology Corporation. No Latency ∆Σ is a trademark of Linear Technology Corporation. ■ Industrial Process Control MICROWIRE is a trademark of National Semiconductor Corporation.
U Effective Resolution vs V TYPICAL APPLICATIO REF
90 80 5V REF 70 1µF µV)* = EXTERNAL CLOCK SOURCE 1 14 60 4.9k VCC FO = INTERNAL OSC/SIMULTANEOUS (100mV) 2 50Hz/60Hz REJECTION REF+ 50 4 100Ω CH0+ 40 LTC2436-1 30 5 13 CH0– SCK THERMOCOUPLE 20 3 12 3-WIRE EFFECTIVE RESOLUTION ( REF– SDO SPI INTERFACE 10 6 11 CH1+ CS 0 7 CH1– 0 1 2 3 4 5 8, 9, 10, 15, 16 VREF (V) 24361 TA02 GND *COMBINES EFFECTS OF PEAK-TO-PEAK NOISE 24361 TA01 AND 16-BIT STEP SIZE (VREF/216) 24361f 1