Linear Technology LTC2439CGN-1, 8-Channel Differential 16-Bit ADC (req DC590) DC790A DC790A Scheda Tecnica
Codici prodotto
DC790A
LTC2439-1
1
24391fa
8-/16-Channel
16-Bit No Latency
∆Σ
TM
ADC
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
The LTC
®
2439-1 is a 16-channel (8-differential)
micropower 16-bit
∆Σ analog-to-digital converter. It op-
erates from 2.7V to 5.5V and includes an integrated
oscillator, 0.12LSB INL and 1
oscillator, 0.12LSB INL and 1
µV RMS noise. It uses delta-
sigma technology and provides single cycle settling time
for multiplexed applications. Through a single pin, the
LTC2439-1 can be configured for better than 87dB differ-
ential mode rejection at 50Hz and 60Hz
for multiplexed applications. Through a single pin, the
LTC2439-1 can be configured for better than 87dB differ-
ential mode rejection at 50Hz and 60Hz
±2%, or it can be
driven by an external oscillator for a user-defined rejec-
tion frequency. The internal oscillator requires no external
frequency setting components.
tion frequency. The internal oscillator requires no external
frequency setting components.
The LTC2439-1 accepts any external differential reference
voltage from 0.1V to V
voltage from 0.1V to V
CC
for flexible ratiometric and remote
sensing measurement applications. It can be configured
to take 8 differential channels or 16 single-ended channels.
The full-scale bipolar input range is from – 0.5V
to take 8 differential channels or 16 single-ended channels.
The full-scale bipolar 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 between GND and V
CC
. The DC common mode
input rejection is better than 140dB.
The LTC2439-1 communicates through a flexible
4-wire digital interface that is compatible with SPI and
MICROWIRE
4-wire digital interface that is compatible with SPI and
MICROWIRE
TM
protocols.
■
Direct Sensor Digitizer
■
Weight Scales
■
Direct Temperature Measurement
■
Gas Analyzers
■
Strain Gauge Transducers
■
Instrumentation
■
Data Acquisition
■
Industrial Process Control
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
16-Channel Single-Ended or 8-Channel Differential
Inputs
Inputs
■
Low Supply Current (200
µA, 4µA in Autosleep)
■
Rail-to-Rail Differential Input/Reference
■
16-Bit No Missing Codes
■
1
µ
V RMS Noise, 16-ENOBS Independent of V
REF
■
Very Low Transition Noise: Less Than 0.02LSB
■
Operates with a Reference as Low as 100mV with
1.5
1.5
µV LSB Step Size
■
Guaranteed Modulator Stability and Lock-Up
Immunity for Any Input and Reference Conditions
Immunity for Any Input and Reference Conditions
■
Single Supply 2.7V to 5.5V Operation
■
Internal Oscillator—No External Components
Required
Required
■
87dB Min, 50Hz and 60Hz Simultaneous Notch Filter
■
Pin Compatible with the 24-Bit LTC2418
■
28-Lead SSOP Package
No Latency
∆Σ is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Minimum Resolvable
Signal vs V
REF
SDI
SCK
SDO
CS
F
O
REF
+
V
CC
9
11
2.7V TO 5.5V
20
18
17
16
19
1
µF
COM
REF
–
GND
10
THERMOCOUPLE
12
15
DIFFERENTIAL
16-BIT
∆Σ ADC
+
–
241418 TA01a
4-WIRE
SPI INTERFACE
SPI INTERFACE
LTC2439-1
= EXTERNAL OSCILLATOR
= 50Hz and 60Hz REJECTION
= 50Hz and 60Hz REJECTION
CH0
CH1
CH1
•
•
•
•
•
•
21
22
22
CH7
CH8
CH8
28
1
CH15
8
16-CHANNEL
MUX
V
REF
(V)
0
*FOR V
REF
= 0.4V RESOLUTION IS LIMITED BY STEP SIZE
0
MINIMUM RESOLVABLE SIGNAL (
µ
V)
10
30
40
50
2
4
5
90
24361 TA02
20
1
3
60
70
80
DESCRIPTIO
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