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LTC2440CGN#PBF

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LTC2440
1
2440fe
For more information www.linear.com/LTC2440
2440 TA01
2440 TA01
REFERENCE VOLTAGE
0.1V TO V
CC
ANALOG INPUT
–0.5V
REF
TO 0.5V
REF
3-WIRE
SPI INTERFACE
6.9Hz, 200nV NOISE,
50/60Hz REJECTION
880Hz OUTPUT RATE,
2µV NOISE
10-SPEED SERIAL
PROGRAMMABLE
V
CC
4.5V TO 5.5V
4
V
CC
BUSY
f
O
REF
+
SCK
IN
+
IN
–
SDO
GND
CS
EXT
SDI
LTC2440
REF
–
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
24-Bit High Speed
Differential
∆∑
ADC with
Selectable Speed/Resolution
The LTC
®
2440 is a high speed 24-bit No Latency ∆∑
TM
ADC with 5ppm INL and 5µV offset. It uses a proprietary
delta-sigma architecture enabling variable speed and reso
-
lution with no latency. Ten speed/resolution combinations
(6.9Hz/200nV
RMS
to 3.5kHz/25µV
RMS
) are programmed
through a simple serial interface. Alternatively, by tying a
single pin HIGH or LOW, a fast (880Hz/2µV
RMS
) or ultralow
noise (6.9Hz, 200nV
RMS
, 50/60Hz rejection) speed/reso-
lution combination can be easily selected. The accuracy
(offset, full-scale, linearity, drift) and power dissipation
are independent of the speed selected. Since there is no
latency
, a speed/resolution change may be made between
conversions with no degradation in performance.
Following each conversion cycle, the LTC2440 automati
-
cally enters a low power sleep state. Power dissipation
may be reduced by increasing the duration of this sleep
state. For example, running at the 3.5kHz conversion speed
but reading data at a 100Hz rate draws 240µA average
current (1.1mW) while reading data at a 7Hz output rate
draws only 25µA (125µW).The LTC2440 communicates
through a flexible 3-wire or 4-wire digital interface that is
compatible with the LTC2410 and is available in a narrow
16-lead SSOP package.
Simple 24-Bit 2-Speed Acquisition System
n
Up to 3.5kHz Output Rate (External f
O
)
n
Selectable Speed/Resolution
n
2µV
RMS
Noise at 880Hz Output Rate
n
200nV
RMS
Noise at 6.9Hz Output Rate with
Simultaneous 50/60Hz Rejection
n
0.0005% INL, No Missing Codes
n
Autosleep Enables 20µA Operation at 6.9Hz
n
<5µV Offset (4.5V < V
CC
< 5.5V, –40°C to 85°C)
n
Differential Input and Differential Reference with
GND to V
CC
Common Mode Range
n
No Latency, Each Conversion is Accurate Even After
an Input Step
n
Internal Oscillator—No External Components
n
Pin Compatible with the LTC2410
n
24-Bit ADC in Narrow 16-Lead SSOP Package
n
High Speed Multiplexing
n
Weight Scales
n
Auto Ranging 6-Digit DVMs
n
Direct Temperature Measurement
n
High Speed Data Acquisition
RMS Noise vs Speed
CONVERSION RATE (Hz)
1
0.1
RMS NOISE (µV)
1
10
100
10 100
2440 TA02
1000 10000
V
CC
= 5V
V
REF
= 5V
V
IN
+
= V
IN
–
= 0V
2µV AT 880Hz
200nV AT 6.9Hz
(50/60Hz REJECTION)
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No Latency ∆∑ and SoftSpan are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
LTC2440
2
2440fe
For more information www.linear.com/LTC2440
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
) to GND ....................... –0.3V to 6V
Analog Input Pins Voltage
to GND ......................................–0.3V to (V
CC
+ 0.3V)
Reference Input Pins Voltage
to GND ......................................–0.3V to (V
CC
+ 0.3V)
Digital Input Voltage to GND .........–0.3V to (V
CC
+ 0.3V)
Digital Output Voltage to GND .......–0.3V to (V
CC
+ 0.3V)
Operating Temperature Range
LTC2440C ............................................... 0°C to 70°C
LTC2440I ............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ...................300°C
(Notes 1,2)
TOP VIEW
GN PACKAGE
16-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
V
CC
REF
+
RE
F
–
IN
+
IN
–
SDI
GND
GND
BUSY
f
O
SCK
SDO
CS
EXT
GND
T
JMAX
= 125°C, θ
JA
= 110°C/W
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2440CGN#PBF LTC2440CGN#TRPBF 2440 Narrow 16-Lead SSOP 0°C to 70°C
LTC2440IGN#PBF LTC2440IGN#TRPBF 2440I Narrow 16-Lead SSOP –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution (No Missing Codes) 0.1V ≤ V
REF
≤ V
CC
, –0.5 • V
REF
≤ V
IN
≤ 0.5 • V
REF
, (Note 5)
l
24 Bits
Integral Nonlinearity V
CC
= 5V, REF
+
= 5V, REF
–
= GND, V
INCM
= 2.5V, (Note 6)
REF
+
= 2.5V, REF
–
= GND, V
INCM
= 1.25V, (Note 6)
l
5
3
15 ppm of V
REF
ppm of V
REF
Offset Error 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND, GND ≤ IN
+
= IN
–
≤ V
CC
(Note 12)
l
2.5 5 µV
Offset Error Drift 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND, GND ≤ IN
+
= IN
–
≤ V
CC
20 nV/°C
Positive Full-Scale Error REF
+
= 5V, REF
–
= GND, IN
+
= 3.75V, IN
–
= 1.25V
REF
+
= 2.5V, REF
–
= GND, IN
+
= 1.875V, IN
–
= 0.625V
l
l
10
10
30
50
ppm of V
REF
ppm of V
REF
Positive Full-Scale Error Drift 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND, IN
+
= 0.75REF
+
, IN
–
= 0.25 • REF
+
0.2 ppm of V
REF
/°C
Negative Full-Scale Error REF
+
= 5V, REF
–
= GND, IN
+
= 1.25V, IN
–
= 3.75V
REF
+
= 2.5V, REF
–
= GND, IN
+
= 0.625V, IN
–
= 1.875V
l
l
10
10
30
50
ppm of V
REF
ppm of V
REF
Negative Full-Scale Error Drift 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND, IN
+
= 0.25 • REF
+
, IN
–
= 0.75 • REF
+
0.2 ppm of V
REF
/°C
Total Unadjusted Error 5V ≤ V
CC
≤ 5.5V, REF
+
= 2.5V, REF
–
= GND, V
INCM
= 1.25V
5V ≤ V
CC
≤ 5.5V, REF
+
= 5V, REF
–
= GND, V
INCM
= 2.5V
REF
+
= 2.5V, REF
–
= GND, V
INCM
= 1.25V, (Note 6)
15
15
15
ppm of V
REF
ppm of V
REF
ppm of V
REF
Input Common Mode Rejection DC 2.5V ≤ REF
+
≤ V
CC
, REF
–
= GND, GND ≤ IN
–
= IN
+
≤ V
CC
120 dB
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 3, 4)
http://www.linear.com/product/LTC2440#orderinfo
LTC2440
3
2440fe
For more information www.linear.com/LTC2440
ANALOG INPUT AND REFERENCE
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IN
+
Absolute/Common Mode IN
+
Voltage
l
GND – 0.3V V
CC
+ 0.3V V
IN
–
Absolute/Common Mode IN
–
Voltage
l
GND – 0.3V V
CC
+ 0.3V V
V
IN
Input Differential Voltage Range (IN
+
– IN
–
)
l
–V
REF
/2 V
REF
/2 V
REF
+
Absolute/Common Mode REF
+
Voltage
l
0.1 V
CC
V
REF
–
Absolute/Common Mode REF
–
Voltage
l
GND V
CC
– 0.1V V
V
REF
Reference Differential Voltage Range (REF
+
– REF
–
)
l
0.1 V
CC
V
C
S(IN
+
)
IN
+
Sampling Capacitance 3.5 pF
C
S(IN
–
)
IN
–
Sampling Capacitance 3.5 pF
C
S(REF
+
)
REF
+
Sampling Capacitance 3.5 pF
C
S(REF
–
)
REF
–
Sampling Capacitance 3.5 pF
I
DC_LEAK(IN
+
, IN
–
,
REF
+
, REF
–
)
Leakage Current, Inputs and Reference CS = V
CC
, IN
+
= GND, IN
–
= GND,
REF
+
= 5V, REF
–
= GND
l
–100 10 100 nA
I
SAMPLE(IN
+
, IN
–
,
REF
+
, REF
–
)
Average Input/Reference Current During
Sampling
Varies, See Applications Section
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
DIGITAL INPUTS AND DIGITAL OUTPUTS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
High Level Input Voltage
CS, f
O
, SDI
4.5V ≤ V
CC
≤ 5.5V
l
2.5 V
V
IL
Low Level Input Voltage
CS, f
O
, SDI
4.5V ≤ V
CC
≤ 5.5V
l
0.8 V
V
IN
High Level Input Voltage
SCK
4.5V ≤ V
CC
≤ 5.5V (Note 8)
l
2.5 V
V
IL
Low Level Input Voltage
SCK
4.5V ≤ V
CC
≤ 5.5V (Note 8)
l
0.8 V
I
IN
Digital Input Current
CS, f
O
0V ≤ V
IN
≤ V
CC
l
–10 10 µA
I
IN
Digital Input Current
SCK
0V ≤ V
IN
≤ V
CC
(Note 8)
l
–10 10 µA
C
IN
Digital Input Capacitance
CS, f
O
10 pF
C
IN
Digital Input Capacitance
SCK
(Note 8) 10 pF
V
OH
High Level Output Voltage
SDO, BUSY
I
O
= –800µA
l
V
CC
– 0.5V V
V
OL
Low Level Output Voltage
SDO, BUSY
I
O
= 1.6mA
l
0.4 V
V
OH
High Level Output Voltage
SCK
I
O
= –800µA (Note 9)
l
V
CC
– 0.5V V
V
OL
Low Level Output Voltage
SCK
I
O
= 1.6mA (Note 9)
l
0.4 V
I
OZ
Hi-Z Output Leakage
SDO
l
–10 10 µA
The l denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
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LTC2440CGN#PBF

Mfr. #:
Buy LTC2440CGN#PBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 24-Bit Diff Input High Speed Delta Sigma ADC
Lifecycle:
New from this manufacturer.
Delivery:
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