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