LTAEY LINEAR [Linear Integrated Systems], LTAEY Datasheet

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LTAEY

Manufacturer Part Number
LTAEY
Description
Differential Input 16-Bit No Latency DS ADC
Manufacturer
LINEAR [Linear Integrated Systems]
Datasheet
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
16-Bit Differential ADC in a Tiny MSOP
Low Supply Current: 200 A, 4 A in Autosleep
Rail-to-Rail Differential Input/Reference
0.12LSB INL, No Missing Codes
0.16LSB Full-Scale Error and 5 V Offset
1.45 V RMS Noise, Independent of V
Very Low Transition Noise: <0.02LSB
Operates with a Reference as Low as 100mV with
16-Bit Resolution
Internal Oscillator—No External Components
Required
87dB Min, Simultaneous 50Hz and 60Hz Notch Filter
Single Supply 2.7V to 5.5V Operation
Pin Compatible with the 20/24-Bit LTC2431/LTC2411
Available in 10-Lead MSOP Package
Direct Sensor Digitizer
Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain-Gage Transducers
Instrumentation
Data Acquisition
Industrial Process Control
100
4.9k
(100mV)
5V REF
U
1 F
1
2
4
5
3
6
V
REF
IN
IN
REF
GND
CC
LTC2433-1
+
+
U
SDO
SCK
CS
F
O
24331 TA01
10
9
8
7
REF
3-WIRE
SPI INTERFACE
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/SIMULTANEOUS
50Hz/60Hz REJECTION
DESCRIPTIO
The LTC
No Latency
grated oscillator. It provides 0.12LSB INL and 1.45 V
RMS noise independent of V
technology and provides single conversion settling of the
digital filter. Through a single pin, the LTC2433-1 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
remote sensing measurement configurations. The full-
scale differential input range is from – 0.5 • V
V
the input common mode voltage, V
dently set anywhere between GND and V
common mode input rejection is better than 140dB.
The LTC2433-1 communicates through a flexible 3-wire
digital interface which is compatible with SPI and
MICROWIRE
No Latency
MICROWIRE is a trademark of National Semiconductor Corporation.
16-Bit No Latency
REF
, LTC and LT are registered trademarks of Linear Technology Corporation.
. The reference common mode voltage, V
®
is a trademark of Linear Technology Corporation.
2433-1 is a differential input micropower 16-bit
TM
TM
protocols.
analog-to-digital converter with an inte-
Minimum Resolvable Signal vs V
U
90
80
70
60
50
40
20
30
10
0
Differential Input
0
*FOR V
IS LIMITED BY STEP SIZE
CC
REF
1
for flexible ratiometric and
0.5V THE RESOLUTION
REF
2
V
REF
. It uses delta-sigma
INCM
LTC2433-1
(V)
3
, may be indepen-
4
24331 TA02
CC
REF
REFCM
ADC
. The DC
REF
5
to 0.5 •
, and
24331fa
1

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LTAEY Summary of contents

Page 1

FEATURES 16-Bit Differential ADC in a Tiny MSOP Low Supply Current: 200 Autosleep Rail-to-Rail Differential Input/Reference 0.12LSB INL, No Missing Codes 0.16LSB Full-Scale Error and 5 V Offset 1.45 V RMS Noise, Independent of V Very ...

Page 2

... REF = 5V, REF = GND, – (Note 12 ORDER PART NUMBER LTC2433-1CMS TOP VIEW LTC2433-1IMS SCK 8 SDO GND MS PART MARKING MS10 PACKAGE = 125 C, = 110 C/W LTAEY JA LTAEZ MIN TYP MAX 16 0.06 0.12 1.25 0. 0.16 1.25 0.04 0.16 1.25 0.04 0.20 0.20 0.25 1.45 U UNITS Bits LSB LSB LSB V nV/ C ...

Page 3

U CO VERTER CHARACTERISTICS temperature range, otherwise specifications are at T PARAMETER CONDITIONS Input Common Mode Rejection DC 2.5V REF GND IN Input Common Mode Rejection 2.5V REF 49Hz to 61.2Hz GND IN Input Normal Mode Rejection (Note 5, 7) ...

Page 4

LTC2433 DIGITAL I PUTS A D DIGITAL OUTPUTS operating temperature range, otherwise specifications are at T SYMBOL PARAMETER V High Level Input Voltage IH CS Low Level Input Voltage IL CS High ...

Page 5

CHARACTERISTICS range, otherwise specifications are SYMBOL PARAMETER f External Oscillator Frequency Range EOSC t External Oscillator High Period HEO t External Oscillator Low Period LEO t Conversion Time CONV f Internal SCK ...

Page 6

LTC2433 CTIO S V (Pin 1): Positive Supply Voltage. Bypass to GND with tantalum capacitor in parallel with 0.1 F ceramic capacitor as close to the part as possible. + – ...

Page 7

CTIO AL DIAGRA V CC GND + + IN – – IN DAC + REF – REF TEST CIRCUITS SDO 1.69k Hi Hi ADC Figure ...

Page 8

LTC2433 APPLICATIO S I FOR ATIO CONVERTER OPERATION Converter Operation Cycle The LTC2433 low power, input/reference and an easy-to-use 3-wire serial interface (see Figure 1). Its operation is made up of three states. The converter operating ...

Page 9

U U APPLICATIO S I FOR ATIO The LTC2433-1 performs offset and full-scale calibrations every conversion cycle. This calibration is transparent to the user and has no effect on the cyclic operation de- scribed above. The advantage of continuous calibration ...

Page 10

LTC2433 APPLICATIO S I FOR ATIO Bit 18 (first output bit) is the end of conversion (EOC) indicator. This bit is available at the SDO pin during the conversion and sleep states whenever the CS pin is LOW. ...

Page 11

U U APPLICATIO S I FOR ATIO Table 2. LTC2433-1 Output Data Format Differential Input Voltage 0.5 • REF 0.5 • – 1LSB REF 0.25 • REF 0.25 ...

Page 12

LTC2433 APPLICATIO S I FOR ATIO operation will not be disturbed if the change of conversion clock source occurs during the sleep state or during the data output state while the converter uses an external serial clock. If ...

Page 13

U U APPLICATIO S I FOR ATIO In addition, the CS signal can be used to trigger a new conversion cycle before the entire serial data transfer has been completed. The LTC2433-1 will abort any serial data transfer in progress ...

Page 14

LTC2433 APPLICATIO S I FOR ATIO The serial data output pin (SDO) is Hi-Z as long HIGH. At any time during the conversion cycle, CS may be pulled LOW in order to monitor the state ...

Page 15

U U APPLICATIO S I FOR ATIO External Serial Clock, 2-Wire I/O This timing mode utilizes a 2-wire serial I/O interface. The conversion result is shifted out of the device by an exter- nally generated serial clock (SCK) signal, see ...

Page 16

LTC2433 APPLICATIO S I FOR ATIO <t EOCtest CS SDO Hi-Z Hi-Z SCK (INTERNAL) CONVERSION SLEEP SLEEP TEST EOC (OPTIONAL) and the device begins outputting data at time t the falling edge of CS (if EOC = 0) ...

Page 17

U U APPLICATIO S I FOR ATIO > t EOCtest CS TEST EOC BIT 0 SDO EOC Hi-Z Hi-Z Hi-Z SCK (INTERNAL) SLEEP CONVERSION SLEEP DATA OUTPUT (OPTIONAL) Figure 10. Internal Serial Clock, Reduced Data Output Length disabled. Hence, SCK ...

Page 18

LTC2433 APPLICATIO S I FOR ATIO CS BIT 18 BIT 17 SDO EOC SCK (INTERNAL) CONVERSION During the conversion, the SCK and the serial data output pin (SDO) are HIGH (EOC = 1). Once the conversion is complete, ...

Page 19

U U APPLICATIO S I FOR ATIO During the conversion period, the undershoot and/or overshoot of a fast digital signal connected to the LTC2433-1 pins may severely disturb the analog to digital conversion process. Undershoot and overshoot can oc- cur ...

Page 20

LTC2433 APPLICATIO S I FOR ATIO REF R (TYP LEAK 20k V + REF I LEAK (TYP LEAK 20k LEAK ...

Page 21

U U APPLICATIO S I FOR ATIO REF = 5V – REF = GND + IN = GND – 2. 0pF IN – GND ...

Page 22

LTC2433 APPLICATIO S I FOR ATIO In addition to this gain error, an offset error term may also appear. The offset error is proportional with the mismatch between the source impedance driving the two input pins + – ...

Page 23

U U APPLICATIO S I FOR ATIO Larger values of reference capacitors (C be required as reference filters in certain configurations. Such capacitors will average the reference sampling charge and the external source resistance will see a quasi con- stant ...

Page 24

LTC2433 APPLICATIO S I FOR ATIO –6 translates into about 7.15 • 10 • f EOSC error. Figure 23 shows the typical INL error due to the source resistance driving the REF large C values are used. The ...

Page 25

U U APPLICATIO S I FOR ATIO input and/or reference capacitors (C previous section provides formulae for evaluating the effect of the source resistance upon the converter perfor- mance for any value small external input and/ ...

Page 26

LTC2433 APPLICATIO S I FOR ATIO REF – GND REF V = 2.5V 12 INCM –2.5V < V < 2. ...

Page 27

PACKAGE DESCRIPTIO 5.23 (.206) MIN 0.305 0.038 (.0120 .0015) TYP RECOMMENDED SOLDER PAD LAYOUT GAUGE PLANE 0.18 (.007) NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD ...

Page 28

LTC2433-1 U TYPICAL APPLICATIO PANASONIC EXB-2HV202G ARRAY V = 294mV REF 147mV INPUT RANGE 4.5 V LSB VISHAY MPM1001/5002B V REF 49mV INPUT RANGE 1.5 V LSB Figure 30. Increased Resolution Bridge/Temperature Measurement RELATED PARTS PART NUMBER ...

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