LTC2436-1
1
24361f
The LTC
®
2436-1 is a 2-channel differential input mi-
cropower 16-bit No Latency ∆Σ
TM
analog-to-digital con-
verter with an integrated oscillator. It provides 0.5LSB
INL and 800nV RMS noise independent of V
REF
. 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 V
CC
for flexible ratiometric and
remote sensing measurement configurations. The full-
scale differential input range is from –0.5 •␣ V
REF
to 0.5 •
V
REF
. The reference common mode voltage, V
REFCM
, and
the input common mode voltage, V
INCM
, may be indepen-
dently set anywhere between GND and V
CC
. 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
MICROWIRE
TM
protocols.
■
Direct Sensor Digitizer
■
Weight Scales
■
Direct Temperature Measurement
■
Gas Analyzers
■
Strain-Gage Transducers
■
Instrumentation
■
Data Acquisition
■
Industrial Process Control
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
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 V
CC
Common Mode Range
■
0.12LSB INL, No Missing Codes
■
0.16LSB Full-Scale Error and 0.006LSB Offset
■
800nV RMS Noise, Independent of V
REF
■
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
2-Channel Differential Input
16-Bit No Latency ∆Σ ADC
No Latency ∆Σ is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
Effective Resolution vs V
REF
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
V
CC
REF
+
F
O
CH0
+
CH0
–
SCK
REF
–
CH1
+
SDO
GND
CS
114
4
13
3
5
THERMOCOUPLE
6
CH1
–
7
12
8, 9, 10, 15, 16
11
24361 TA01
2
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/SIMULTANEOUS
50Hz/60Hz REJECTION
3-WIRE
SPI INTERFACE
1µF
(100mV)
4.9k
100Ω
5V REF
LTC2436-1
V
REF
(V)
0
*COMBINES EFFECTS OF PEAK-TO-PEAK NOISE
AND 16-BIT STEP SIZE (V
REF
/2
16
)
0
EFFECTIVE RESOLUTION (µV)*
10
30
40
50
2
4
5
90
24361 TA02
20
13
60
70
80
