LINEAR TECHNOLOGY LTC2483 Technical data

Input Current Cancellation and I

FEATURES

■

Easy Drive Technology Enables Rail-to-Rail Inputs
with Zero Differential Input Current

■

Directly Digitizes High Impedance Sensors with
Full Accuracy

■

600nV RMS Noise, Independent of V

■

GND to VCC Input/Reference Common Mode Range

■

2-Wire I2C Interface

■

Simultaneous 50Hz/60Hz Rejection

■

2ppm (0.25LSB) INL, No Missing Codes

■

1ppm Offset and 15ppm Full-Scale Error

■

No Latency: Digital Filter Settles in a Single Cycle

■

Single Supply 2.7V to 5.5V Operation

■

Internal Oscillator

■

Six Addresses Available

■

Available in a Tiny (3mm × 3mm) 10-Lead

REF

DFN Package

U

APPLICATIO S

■

Direct Sensor Digitizer

■

Weight Scales

■

Direct Temperature Measurement

■

Strain Gauge Transducers

■

Instrumentation

■

Industrial Process Control

■

DVMs and Meters

LTC2483

16-Bit ∆Σ ADC with Easy Drive

2

C Interface

U

DESCRIPTIO

The LTC®2483 combines a 16-bit plus sign No Latency ∆Σ
analog-to-digital converter with patented Easy DriveTM tech­nology and I
scheme eliminates dynamic input current errors and the
shortcomings of on-chip buffering through automatic
cancellation of differential input current. This allows large
external source impedances and input signals, with rail-to­rail input range to be directly digitized while maintaining
exceptional DC accuracy.

The LTC2483 allows a wide common mode input range
(0V to V
reference can be as low as 100mV or can be tied directly

. The noise level is 600nV RMS independent of V

to V

CC

This allows direct digitization of low level signals with 16­bit accuracy. The LTC2483 includes an on-chip trimmed
oscillator, eliminating the need for external crystals or
oscillators and provides 87dB rejection of 50Hz and 60Hz
line frequency noise. Absolute accuracy and low drift are
automatically maintained through continuous, transpar­ent, offset and full-scale calibration.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
No Latency ∆Σ and Easy Drive are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Patent Pending.

2

C digital interface. The patented sampling

) independent of the reference voltage. The

CC

REF

TM

.

TYPICAL APPLICATIO

V

CC

SENSE

10k

10k

= 0

I

DIFF

1µF

V

IN

V

IN

REF+V

+

LTC2483

–

GND

REF

U

+FS Error vs R

80

VCC = 5V

= 5V

V

REF

60

+

= 3.75V

V

IN

–

= 1.25V

V

IN

40

= GND

F

1µF

SCL

SDA

CA0/F

CA1

2483 TA01

2-WIRE

2

I

C INTERFACE

0

6 ADDRESSES

CC

–

O

= 25°C

T

A

20

0

–20

+FS ERROR (ppm)

–40

–60

–80

1

10 100 10k

SOURCE

R

SOURCE

at IN+ and IN

CIN = 1µF

1k

(Ω)

–

100k

2483 TA02

2483fa

1

LTC2483

TOP VIEW

11

DD PACKAGE

10-LEAD (3mm × 3mm) PLASTIC DFN

10

9

6

7

8

4

5

3

2

1

CA0/F

0

CA1

GND

SDA

SCL

REF

+

V

CC

REF

–

IN

+

IN

–

WWWU

ABSOLUTE AXI U RATI GS

(Notes 1, 2)

Supply Voltage (VCC) to GND...................... –0.3V to 6V

Analog Input Voltage to GND ....... –0.3V to (V

Reference Input Voltage to GND .. – 0.3V to (V

Digital Input Voltage to GND ........ – 0.3V to (V

Digital Output Voltage to GND ..... – 0.3V to (V

Operating Temperature Range

LTC2483C ................................................... 0°C to 70°C

LTC2483I ................................................ – 40°C to 85°C

Storage Temperature Range ................ –65°C to 125°C

+ 0.3V)

CC

+ 0.3V)

CC

+ 0.3V)

CC

+ 0.3V)

CC

UU

W

PACKAGE/ORDER I FOR ATIO

T

= 125°C, θJA = 43°C/ W

JMAX

EXPOSED PAD (PIN 11) IS GND

MUST BE SOLDERED TO PCB

ORDER PART NUMBER

LTC2483CDD
LTC2483IDD

Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marking: http://www.linear.com/leadfree/

Consult LTC Marketing for parts specified with wider operating temperature ranges.
*The temperature grade is identified by a label on the shipping container.

DD PART MARKING*

LBSR

ELECTRICAL CHARACTERISTICS

temperature range, otherwise specifications are at T

The ● denotes the specifications which apply over the full operating

= 25°C. (Notes 3, 4)

A

PARAMETER CONDITIONS MIN TYP MAX UNITS

Resolution (No Missing Codes) 0.1 ≤ V
Integral Nonlinearity 5V ≤ VCC ≤ 5.5V, V

2.7V ≤ VCC ≤ 5.5V, V
Offset Error 2.5V ≤ V
Offset Error Drift 2.5V ≤ V
Positive Full-Scale Error 2.5V ≤ V
Positive Full-Scale Error Drift 2.5V ≤ V

≤ VCC, –FS ≤ VIN ≤ +FS (Note 5)

REF

= 5V, V

REF

= 2.5V, V

REF

≤ VCC, GND ≤ IN+ = IN– ≤ VCC (Note 13)

REF

≤ VCC, GND ≤ IN+ = IN– ≤ V

REF

≤ VCC, IN+ = 0.75V

REF

≤ VCC, IN+ = 0.75V

REF

= 2.5V (Note 6)

IN(CM)

IN(CM)

, IN– = 0.25V

REF

, IN– = 0.25V

REF

= 1.25V (Note 6) 1 ppm of V

CC

REF

REF

●

16 Bits

●

●

2 10 ppm of V

0.5 2.5 µV
10 nV/°C

●

25 ppm of V

0.1 ppm of

V

Negative Full-Scale Error 2.5V ≤ V
Negative Full-Scale Error Drift 2.5V ≤ V

≤ VCC, IN– = 0.75V

REF

≤ VCC, IN– = 0.75V

REF

, IN+ = 0.25V

REF

, IN+ = 0.25V

REF

REF

REF

●

25 ppm of V

0.1 ppm of

V

Total Unadjusted Error 5V ≤ VCC ≤ 5.5V, V

5V ≤ VCC ≤ 5.5V, V

2.7V ≤ VCC ≤ 5.5V, V

Output Noise 5V ≤ VCC ≤ 5.5V, V

= 2.5V, V

REF

= 5V, V

REF

= 2.5V, V

REF

= 5V, GND ≤ IN– = IN+ ≤ VCC (Note 12) 0.6 µV

REF

= 1.25V (Note 6) 15 ppm of V

IN(CM)

= 2.5V (Note 6) 15 ppm of V

IN(CM)

= 1.25V (Note 6) 15 ppm of V

IN(CM)

REF

REF

REF
REF

REF

/°C

REF

/°C

REF
REF

REF

RMS

2

2483fa

LTC2483

U

CO VERTER CHARACTERISTICS

temperature range, otherwise specifications are at T

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Common Mode Rejection DC 2.5V ≤ V
Input Common Mode Rejection 2.5V ≤ V

50Hz ±2%
Input Common Mode Rejection 2.5V ≤ V

60Hz ±2%
Input Normal Mode Rejection 2.5V ≤ V

50Hz ±2%
Input Normal Mode Rejection 2.5V ≤ V

60Hz ±2%
Input Normal Mode Rejection 2.5V ≤ V

50Hz/60Hz ±2%
Reference Common Mode 2.5V ≤ V

Rejection DC

Power Supply Rejection DC V

Power Supply Rejection, 50Hz ±2% V

Power Supply Rejection, 60Hz ±2% V

REF

REF

REF

≤ VCC, GND ≤ IN– = IN+ ≤ V

REF

≤ VCC, GND ≤ IN– = IN+ ≤ V

REF

≤ VCC, GND ≤ IN– = IN+ ≤ V

REF

≤ VCC, GND ≤ IN– = IN+ ≤ V

REF

≤ VCC, GND ≤ IN– = IN+ ≤ V

REF

≤ VCC, GND ≤ IN– = IN+ ≤ V

REF

≤ VCC, GND ≤ IN– = IN+ ≤ V

REF

= 2.5V, IN– = IN+ = GND 120 dB

= 2.5V, IN– = IN+ = GND (Notes 7, 9) 120 dB

= 2.5V, IN– = IN+ = GND (Notes 8, 9) 120 dB

The ● denotes the specifications which apply over the full operating

= 25°C. (Notes 3, 4)

A

(Note 5)

CC

(Note 5)

CC

(Note 5)

CC

(Notes 5, 7)

CC

(Notes 5, 8)

CC

(Notes 5, 9)

CC

(Note 5)

CC

●

140 dB

●

140 dB

●

140 dB

●

110 120 dB

●

110 120 dB

●

87 dB

●

120 140 dB

UUU

A ALOG I PUT AUD REFERE CE

temperature range, otherwise specifications are at TA = 25°C. (Note 3)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

+

IN

–

IN

FS Full Scale of the Differential Input (IN+ – IN–)

LSB Least Significant Bit of the Output Code

V

IN

V

REF

CS (IN+)IN

CS (IN–)IN

CS (V

)V

REF

I

(IN+)IN+ DC Leakage Current Sleep Mode, IN+ = GND

DC_LEAK

I

(IN–)IN– DC Leakage Current Sleep Mode, IN– = GND

DC_LEAK

I

DC_LEAK (VREF

Absolute/Common Mode IN+ Voltage GND – 0.3V VCC + 0.3V V

Absolute/Common Mode IN– Voltage GND – 0.3V VCC + 0.3V V

Input Differential Voltage Range (IN+ – IN–)

Reference Voltage Range (REF+ – REF–)

+

Sampling Capacitance 11 pF

–

Sampling Capacitance 11 pF

Sampling Capacitance 11 pF

REF

)REF+, REF– DC Leakage Current Sleep Mode, V

The ● denotes the specifications which apply over the full operating

●

0.5V

REF

16

FS/2

–FS +FS V

0.1 V

CC

–10 1 10 nA

–10 1 10 nA

–100 1 100 nA

REF

= V

CC

●

●

●

●

●

●

V

V

2483fa

3

LTC2483

UU

I2C DIGITAL I PUTS A D DIGITAL OUTPUTS

the full operating temperature range, otherwise specifications are at T

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

IH

V

IL

V

IL(CA1)

V

IH(CA0/F0,CA1)

R

INH

R

INL

R

INF

I

I

V

HYS

V

OL

t

OF

t

SP

I

IN

C

I

C

B

C

CAX

V

IH(EXT,OSC)

V

IL(EXT,OSC)

High Level Input Voltage

Low Level Input Voltage

Low Level Input Voltage for Address Pin

High Level Input Voltage for Address Pins

Resistance from CA0/F0,CA1 to VCC to Set
Chip Address Bit to 1

Resistance from CA1 to GND to Set
Chip Address Bit to 0

Resistance from CA0/F0, CA1 to VCC or
GND to Set Chip Address Bit to Float

Digital Input Current

Hysteresis of Schmitt Trigger Inputs (Note 5) 0.05V

Low Level Output Voltage SDA I = 3mA

Output Fall Time from V

IHMIN

to V

ILMAX

Bus Load CB 10pF to 400pF (Note 14)

Input Spike Suppression

Input Leakage 0.1V

CC

≤ V

IN

Capacitance for Each I/O Pin

Capacitance Load for Each Bus Line

External Capacitive Load on Chip
Address Pins (CA0/F

High Level CA0/F0 External Oscillator 2.7V ≤ V

Low Level CA0/F0 External Oscillator 2.7V ≤ V

,CA1) for Valid Float

0

CC

CC

= 25°C. (Note 3)

A

≤ V

CC

< 5.5V

< 5.5V

The ● denotes the specifications which apply over

●

0.7V

CC

●

●

●

0.95V

CC

●

●

●

●

●

●

●

●

●

●

●

●

●

2MΩ

–10 10 µA

CC

20+0.1C

B

10 pF

V

– 0.5V V

CC

0.3V

CC

0.05V

CC

10 kΩ

10 kΩ

0.4 V

250 ns

50 ns

1 µA

400 pF

10 pF

0.5 V

V

V

V

V

V

WU

POWER REQUIRE E TS

range, otherwise specifications are at T

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

CC

I

CC

Supply Voltage

Supply Current Conversion Mode (Note 11)

A

The ● denotes the specifications which apply over the full operating temperature

= 25°C. (Note 3)

Sleep Mode (Note 11)

●

●

●

2.7 5.5 V

160 250 µA

12 µA

2483fa

4

LTC2483

WU

TI I G CHARACTERISTICS

range, otherwise specifications are at T

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

f

EOSC

t

HEO

t

LEO

t

CONV_1

External Oscillator Frequency Range

External Oscillator High Period

External Oscillator Low Period

Conversion Time Simultaneous 50Hz/60Hz

= 25°C. (Note 3)

A

The ● denotes the specifications which apply over the full operating temperature

External Oscillator (Note 10)

●

●

●

●

●

10 4000 kHz

0.125 100 µs

0.125 100 µs

144.1 146.9 149.9 ms
41036/f

EOSC

ms

UW

I2C TI I G CHARACTERISTICS

temperature range, otherwise specifications are at T

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

f

SCL

t

HD(SDA)

t

LOW

t

HIGH

t

SU(STA)

t

HD(DAT)

t

SU(DAT)

t

r

t

f

t

SU(STO)

SCL Clock Frequency

Hold Time (Repeated) START Condition

LOW Period of the SCL Clock Pin

HIGH Period of the SCL Clock Pin

Set-Up Time for a Repeated START Condition

Data Hold Time

Data Set-Up Time

Rise Time for Both SDA and SCL Signals (Note 14)

Fall Time for Both SDA and SCL Signals (Note 14)

Set-Up Time for STOP Condition

The ● denotes the specifications which apply over the full operating

= 25°C. (Notes 3, 15)

A

●

●

●

●

●

●

●

●

●

●

0 400 kHz

0.6 µs

1.3 µs

0.6 µs

0.6 µs

0 0.9 µs

100 ns

20+0.1C

B

20+0.1C

B

0.6 µs

300 ns

300 ns

Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.

Note 2: All voltage values are with respect to GND.
Note 3: V

= 2.7V to 5.5V unless otherwise specified.

CC

= REF+ – REF–, V

V

REF

= IN+ – IN–, V

V

IN

INCM

= (REF+ + REF–)/2, FS = 0.5V

REFCM

= (IN+ + IN–)/2.

REF

;

Note 4: Use internal conversion clock or external conversion clock source
with f

= 307.2kHz unless otherwise specified.

EOSC

Note 5: Guaranteed by design, not subject to test.
Note 6: Integral nonlinearity is defined as the deviation of a code from a

straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.

Note 7: 50Hz f
Note 8: 60Hz f
Note 9: Simultaneous 50Hz/60Hz (internal oscillator) or f

= 256kHz ±2% (external oscillator).

EOSC

= 307.2kHz ±2% (external oscillator).

EOSC

EOSC

= 280kHz

±2% (external oscillator).
Note 10: The external oscillator is connected to the CA0/F

external oscillator frequency, f

, is expressed in kHz.

EOSC

pin. The

0

Note 11: The converter uses the internal oscillator.
Note 12: The output noise includes the contribution of the internal

calibration operations.

Note 13: Guaranteed by design and test correlation.
Note 14: C
Note 15: All values refer to V

= capacitance of one bus line in pF.

B

and V

IH(MIN)

IL(MAX)

levels.

2483fa

5

LTC2483

INPUT VOLTAGE (V)

–12

TUE (ppm OF V

REF

)

–4

4

12

–8

0

8

–0.75 –0.25 0.25 0.75

2483 G06

1.25–1.25

VCC = 2.7V
V

REF

= 2.5V

V

IN(CM)

= 1.25V

85°C

25°C

–45°C

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Integral Nonlinearity
(V

= 5V, V

CC

3

VCC = 5V

= 5V

V

REF

2

)

1

REF

0

–1

INL (ppm OF V

–2

–3

= 2.5V

V

IN(CM)

–45°C

85°C

–1.5 –0.5 0.5 1.5

INPUT VOLTAGE (V)

Total Unadjusted Error
(V

= 5V, V

CC

12

VCC = 5V

= 5V

V

REF

8

)

4

REF

0

V

IN(CM)

= 2.5V

REF

25°C

REF

= 5V)

= 5V)

25°C

85°C

–45°C

2483 G01

Integral Nonlinearity
(VCC = 5V, V

3

VCC = 5V

= 2.5V

V

REF

2

)

1

REF

0

–1

INL (ppm OF V

–2

2.5–2–2.5 –1 0 1 2

–3

= 1.25V

V

IN(CM)

–0.75 –0.25 0.25 0.75

= 2.5V)

REF

–45°C, 25°C, 90°C

INPUT VOLTAGE (V)

1.25–1.25

2483 G02

Total Unadjusted Error
(VCC = 5V, V

12

8

)

4

REF

0

VCC = 5V

= 2.5V

V

REF

V

IN(CM)

= 1.25V

REF

= 2.5V)

85°C

25°C

–45°C

Integral Nonlinearity
(VCC = 2.7V, V

3

VCC = 2.7V

= 2.5V

V

REF

2

)

1

REF

0

–1

INL (ppm OF V

–2

–3

= 1.25V

V

IN(CM)

–0.75 –0.25 0.25 0.75

INPUT VOLTAGE (V)

Total Unadjusted Error
(VCC = 2.7V, V

= 2.5V)

REF

–45°C, 25°C, 90°C

= 2.5V)

REF

1.25–1.25

2483 G03

–4

TUE (ppm OF V

–8

–12

–1.5 –0.5 0.5 1.5

INPUT VOLTAGE (V)

2.5–2–2.5 –1 0 1 2

2483 G04

–4

TUE (ppm OF V

–8

–12

–0.75 –0.25 0.25 0.75

INPUT VOLTAGE (V)

Noise Histogram (6.8sps) Long-Term ADC ReadingsNoise Histogram (7.5sps)

14

10,000 CONSECUTIVE
READINGS

12

= 5V

V

CC

= 5V

V

REF

= 0V

V

10

IN

= 25°C

T

A

8

6

4

NUMBER OF READINGS (%)

2

0

–3

–1.8 –0.6

–2.4 1.2

–1.2 0 1.8

OUTPUT READING (µV)

RMS = 0.60µV

AVERAGE = –0.69µV

0.6

2483 G07

14

10,000 CONSECUTIVE
READINGS

12

= 2.7V

V

CC

= 2.5V

V

REF

= 0V

V

10

IN

= 25°C

T

A

8

6

4

NUMBER OF READINGS (%)

2

0

–3

–1.8 –0.6

–2.4 1.2

–1.2 0 1.8

OUTPUT READING (µV)

2483 G05

RMS = 0.59µV

AVERAGE = –0.19µV

0.6

2483 G08

1.25–1.25

5

VCC = 5V, V

= 25°C, RMS NOISE = 0.60µV

T

4

A

3

2

1

0

–1

ADC READING (µV)

–2

–3

–4

–5

0

10

= 5V, VIN = 0V, V

REF

30 40

20

TIME (HOURS)

IN(CM)

= 2.5V

50

60

2483 G09

2483fa

6

UW

V

IN(CM)

(V)

–1

OFFSET ERROR (ppm OF V

REF

)

0.1

0.2

0.3

24

2483 G15

0

–0.1

01

356

–0.2

–0.3

VCC = 5V
V

REF

= 5V

V

IN

= 0V

T

A

= 25°C

TYPICAL PERFOR A CE CHARACTERISTICS

RMS Noise
vs Input Differential Voltage RMS Noise vs V

1.0
VCC = 5V

V

= 5V

REF

0.9

)

REF

0.8

V

IN(CM)

T

A

= 2.5V

= 25°C

1.0

0.9

0.8

VCC = 5V

= 5V

V

REF

= 0V

V

IN

V

IN(CM)

= 25°C

T

A

= GND

IN(CM)

LTC2483

RMS Noise vs Temperature (TA)

1.0
VCC = 5V

= 5V

V

REF

0.9

= 0V

V

IN

= GND

V

IN(CM)

0.8

0.7

0.6

RMS NOISE (ppm OF V

0.5

0.4
–1.5 –0.5 0.5 1.5

INPUT DIFFERENTIAL VOLTAGE (V)

RMS Noise vs V

1.0

V

= 2.5V

REF

= 0V

V

IN

= GND

V

0.9

IN(CM)

= 25°C

T

A

0.8

0.7

RMS NOISE (µV)

0.6

0.5

0.4

2.7

3.1 3.5

CC

4.3 5.1 5.5

3.9 4.7
VCC (V)

2483 G10

2483 G13

0.7

RMS NOISE (µV)

0.6

0.5

0.4
–1

2.5–2–2.5 –1 0 1 2

01

RMS Noise vs V

1.0

VCC = 5V

= 0V

V

IN

0.9

0.8

0.7

RMS NOISE (µV)

0.6

0.5

0.4

= GND

V

IN(CM)

= 25°C

T

A

0

1234

356

24

V

(V)

IN(CM)

REF

V

(V)

REF

2483 G11

5

2483 G14

0.7

RMS NOISE (µV)

0.6

0.5

0.4
–45

–30 –15 15

Offset Error vs V

0304560

TEMPERATURE (°C)

IN(CM)

75 90

2483 G12

Offset Error vs Temperature Offset Error vs V

0.3
VCC = 5V

V

REF

0.2

V

)

IN

V

REF

IN(CM)

0.1

0

–0.1

OFFSET ERROR (ppm OF V

–0.2

–0.3

–30 0

–45

= 5V

= 0V

= GND

–15

TEMPERATURE (°C)

30 90

15

CC

0.3
REF+ = 2.5V

–

= GND

REF

)

REF

OFFSET ERROR (ppm OF V

60

45

75

2483 G16

–0.1

–0.2

–0.3

0.2

0.1

0

2.7

= 0V

V

IN

V

IN(CM)

= 25°C

T

A

3.1 3.5

= GND

4.3 5.1 5.5

3.9 4.7
VCC (V)

2483 G17

Offset Error vs V

0.3

0.2

)

REF

0.1

0

–0.1

OFFSET ERROR (ppm OF V

–0.2

–0.3

0

1234

REF

VCC = 5V

–

= GND

REF

= 0V

V

IN

= GND

V

IN(CM)

= 25°C

T

A

V

(V)

REF

5

2483.G18

2483fa

7

LTC2483

FREQUENCY AT VCC (Hz)

1

0

–20

–40

–60

–80

–100

–120

–140

1k 100k

2483 G23

10 100

10k 1M

REJECTION (dB)

VCC = 4.1V DC
V

REF

= 2.5V

IN

+

= GND

IN

–

= GND

T

A

= 25°C

UW

TYPICAL PERFOR A CE CHARACTERISTICS

On-Chip Oscillator Frequency
vs Temperature

310

308

306

304

FREQUENCY (kHz)

VCC = 4.1V

= 2.5V

V

302

REF

= 0V

V

IN

= GND

V

IN(CM)

300

–45 –30

–15

TEMPERATURE (°C)

30

150

PSRR vs Frequency at V

0

VCC = 4.1V DC ±1.4V

= 2.5V

V

REF

–20

+

= GND

IN

–

= GND

IN

–40

= 25°C

T

A

–60

–80

REJECTION (dB)

–100

–120

On-Chip Oscillator Frequency
vs V

CC

310

308

306

304

FREQUENCY (kHz)

302

300

60 75

90

2483 G21

45

2.5

3.5 4.0 4.5

3.0
VCC (V)

V

REF

V

IN

V

IN(CM)

= 2.5V

= 0V

= GND

5.0 5.5

2483 G22

PSRR vs Frequency at V

CC

Conversion Current

CC

PSRR vs Frequency at V

0

VCC = 4.1V DC ±0.7V

= 2.5V

V

REF

–20

+

= GND

IN

–

= GND

IN

–40

= 25°C

T

A

–60

–80

REJECTION (dB)

–100

–120

CC

vs Temperature

200

180

160

140

CONVERSION CURRENT (µA)

120

VCC = 5V

VCC = 2.7V

–140

8

0

60

80

40

20

FREQUENCY AT VCC (Hz)

100

SLEEP MODE CURRENT (µA)

140

120 160

180

2483 G24

Sleep Mode Current
vs Temperature

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

–30 0

–15

–45

TEMPERATURE (°C)

220200

VCC = 5V

VCC = 2.7V

30 90

45

15

–140

30600

60

30650 30700 30800

FREQUENCY AT VCC (Hz)

75

2483 G27

30750

500

450

400

350

300

250

SUPPLY CURRENT (µA)

200

150

100

100

–30 0

–45

2483 G25

Conversion Current
vs Output Data Rate

V

= V

REF

CC

IN+ = GND

–

= GND

IN

= EXT OSC

CA0/F

0

= 25°C

T

A

0

20 40 60 1007010 30 50 90

OUTPUT DATA RATE (READINGS/SEC)

VCC = 5V

–15

TEMPERATURE (°C)

VCC = 3V

80

30 90

15

2483 G28

60

75

45

2483 G26

2483fa

LTC2483

U

UU

PI FU CTIO S

REF+ (Pin 1), REF– (Pin 3): Differential Reference Input.
The voltage on these pins can have any value between GND
and V
more positive than the reference negative input, REF
at least 0.1V.

V

(Pin 8) with a 1µF tantalum capacitor in parallel with 0.1µF
ceramic capacitor as close to the part as possible.

IN+ (Pin 4), IN– (Pin 5): Differential Analog Input. The
voltage on these pins can have any value between
GND – 0.3V and V
converter bipolar input range (V
from –0.5 • V
the converter produces unique overrange and underrange
output codes.

SCL (Pin 6): Serial Clock Pin of the I2C Interface. The
LTC2483 can only act as a slave and the SCL pin only
accepts external serial clock. Data is shifted out the SDA
pin on the falling edges of the SCL clock.

as long as the reference positive input, REF+, is

CC

(Pin 2): Positive Supply Voltage. Bypass to GND

CC

+ 0.3V. Within these limits the

CC

= IN+ – IN–) extends

IN

to 0.5 • V

REF

. Outside this input range

REF

–

, by

SDA (Pin 7): Serial Data Output Line of the I2C Interface.
In the transmitter mode (Read), the conversion result is
output through the SDA pin. It is an open-drain N-channel
driver and therefore an external pull-up resistor or current
source to V

GND (Pin 8): Ground. Connect this pin to a ground plane
through a low impedance connection.

CA1 (Pin 9): Chip Address Control Pin. The CA1 pin is
configured as a three state (LOW, HIGH, or Floating)
address control bit for the device I

CA0/F

0

Input Pin. When no transition is detected on the CA0/F
pin, it is a two state (HIGH or Floating) address control bit
for the device I
external clock signal with a frequency f
10kHz, the converter uses this signal as its system clock
and the fundamental digital filter rejection null is located at
a frequency f
internally to a HIGH.

is needed.

CC

2

C address.

(Pin 10): Chip Address Control Pin/External Clock

0

2

C address. When the pin is driven by an

of at least

EOSC

/5120 and sets the Chip Address CA0

EOSC

2483fa

9

LTC2483

UU

W

FU CTIO AL BLOCK DIAGRA

+

REF

1

+

IN

4

–

IN

5

+

IN

–

IN

AUTOCALIBRATION

–

REF

3

REF

3RD ORDER

∆Σ ADC

–

REF

AND CONTROL

+

V

GND

2

CC

SCL

6

CA0/F

SDA

CA1

0

2483 FB

7

9

10

I2C

SERIAL

INTERFACE

INTERNAL

OSCILLATOR

8

10

2483fa