LINEAR TECHNOLOGY LTC2453 Technical data

Ultra-Tiny, Differential,

16-Bit ΔΣ ADC With

FEATURES DESCRIPTION

■

±VCC Differential Input Range

■

16-Bit Resolution (Including Sign), No Missing

Codes

■

2LSB Offset Error

■

4LSB Full-Scale Error

■

60 Conversions Per Second

■

Single Conversion Settling Time for Multiplexed

Applications

■

Single-Cycle Operation with Auto Shutdown

■

800μA Supply Current

■

0.2μA Sleep Current

■

Internal Oscillator—No External Components

Required

■

2-Wire I2C Interface

■

Ultra-Tiny 8-Pin 3mm × 2mm DFN

and TSOT23 Packages

APPLICATIONS

■

System Monitoring

■

Environmental Monitoring

■

Direct Temperature Measurements

■

Instrumentation

■

Industrial Process Control

■

Data Acquisition

■

Embedded ADC Upgrades

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6208279, 6411242, 7088280, 7164378.

The LTC®2453 is an ultra-tiny, fully differential, 16-bit,
analog-to-digital converter. The LTC2453 uses a single

2.7V to 5.5V supply and communicates through an I
interface. The ADC is available in an 8-pin, 3mm × 2mm
DFN package or 8-pin, 3mm × 3mm TSOT package. It
includes an integrated oscillator that does not require any
external components. It uses a delta-sigma modulator
as a converter core and has no latency for multiplexed
applications. The LTC2453 includes a proprietary input
sampling scheme that reduces the average input sam­pling current several orders of magnitude lower than
conventional delta-sigma converters. Additionally, due
to its architecture, there is negligible current leakage
between the input pins.

The LTC2453 can sample at 60 conversions per second,
and due to the very large oversampling ratio, has ex-tremely
relaxed antialiasing requirements. The LTC2453 includes
continuous internal offset and full-scale calibration algo­rithms which are transparent to the user, ensuring accuracy
over time and over the operating temperature range. The
converter has external REF
input voltage range can extend up to ±(V

Following a single conversion, the LTC2453 can auto­matically enter a sleep mode and reduce its power to less
than 0.2μA. If the user reads the ADC once a second, the
LTC2453 consumes an average of less than 50μW from
a 2.7V supply.

LTC2453

2

I

C Interface

+

and REF– pins and the differential

REF

+

– V

REF

–

).

2

C

TYPICAL APPLICATION

IN

IN

REF+V

+

–

REF

LTC2453

–

CC

GND

2453 TA01

10k

10k

10k

R

0.1μF

0.1μF

0.1μF 10μF

SCL

2-WIRE I2C

SDA

INTERFACE

2.7V TO 5.5V

Integral Nonlinearity, VCC = 3V

2.0
VCC = 3V

+

= 3V

V

REF

1.5

–

V

= 0V

REF

1.0

0.5

0

INL (LSB)

–0.5

–1.0

–1.5

–2.0

–3

TA = –45°C, 25°C, 90°C

–2 –1 1

DIFFERENTIAL INPUT VOLTAGE (V)

0

2

3

2453fa

1

LTC2453

ABSOLUTE MAXIMUM RATINGS

(Notes 1, 2)

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

+

–

, V

Analog Input Voltage (V
Reference Voltage (V

REF

IN

+

, V

) .. –0.3V to (V

IN

–

) .. –0.3V to (V

REF

Digital Voltage (SDA, SCL) ............ –0.3V to (V

+ 0.3V)

CC

+ 0.3V)

CC

+ 0.3V)

CC

PIN CONFIGURATION

TOP VIEW

Storage Temperature Range ................... –65°C to 150°C

Operating Temperature Range

LTC2453C ................................................ 0°C to 70°C

LTC2453I.............................................. –40°C to 85°C

SDA

1GND

–

REF

2

+

REF

3

V

4

CC

8-LEAD (3mm × 2mm) PLASTIC DFN

C/I GRADE T

EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB

DDB PACKAGE

JMAX

8

SCL

7

9

= 125°C, θJA = 76°C/W

+

IN

6

–

IN

5

GND 1
REF¯ 2
REF

VCC4

C/I GRADE T

TOP VIEW

8 SDA

+

3

TS8 PACKAGE

8-LEAD PLASTIC TSOT-23

= 125°C, θJA = 140°C/W

JMAX

7 SCL
6 IN
5 IN¯

+

ORDER INFORMATION

Lead Free Finish

TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE

LTC2453CDDB#TRMPBF LTC2453CDDB#TRPBF LDBQ

LTC2453IDDB#TRMPBF LTC2453IDDB#TRPBF LDBQ

LTC2453CTS8#TRMPBF LTC2453CTS8#TRPBF LTDCG 8-Lead Plastic TSOT-23 0°C to 70°C

LTC2453ITS8#TRMPBF LTC2453ITS8#TRPBF LTDCG 8-Lead Plastic TSOT-23 –40°C to 85°C

TRM = 500 pieces. *Temperature grades are identifi ed by a label on the shipping container.
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/

8-Lead Plastic (3mm × 2mm) DFN

8-Lead Plastic (3mm × 2mm) DFN

0°C to 70°C

–40°C to 85°C

ELECTRICAL CHARACTERISTICS

The l denotes the specifi cations which apply over the full operating

temperature range, otherwise specifi cations are at TA = 25°C. (Note 2)

PARAMETER CONDITIONS MIN TYP MAX UNITS

l

Resolution (No Missing Codes) (Note 3)

Integral Nonlinearity (Note 4)

Offset Error

Offset Error Drift 0.02 LSB/°C

Gain Error

Gain Error Drift 0.02 LSB/°C

Transition Noise 1.4 μV

Power Supply Rejection DC 80 dB

16 Bits

l

l

l

210 LSB

210 LSB

0.01 0.02 % of FS

RMS

2453fa

2

LTC2453

The l denotes the specifi cations which apply over the full

ANALOG INPUTS AND REFERENCES

operating temperature range, otherwise specifi cations are at T

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

+

V

IN

–

V

IN

+

V

REF

–

V

REF

+

, V

V

OR

UR

–

, V

V

OR

UR

C

IN

I

DC_LEAK(IN+)

+

–

Positive Input Voltage Range

Negative Input Voltage Range

Positive Reference Voltage Range V

Negative Reference Voltage Range V

Overrange/Underrange Voltage, IN

+

V

Overrange/Underrange Voltage, IN– V

IN+, IN– Sampling Capacitance 0.35 pF

IN+ DC Leakage Current VIN = GND (Note 8)

V

I

DC_LEAK(IN–)

IN– DC Leakage Current VIN = GND (Note 8)

V

I

DC_LEAK(REF+, REF–)

I

CONV

POWER REQUIREMENTS

The l denotes the specifi cations which apply over the full operating temperature

REF+, REF– DC Leakage Current V

Input Sampling Current (Note 5) 50 nA

range, otherwise specifi cations are at TA = 25°C.

= 25°C.

A

+

– V

REF

REF

+

– V

REF

REF

= 5V, V

REF

= 5V, V

REF

= V

(Note 8)

IN

CC

= V

(Note 8)

IN

CC

= 3V (Note 8)

REF

l

0V

l

0V

–

≥ 2.5V

–

≥ 2.5V

–

= 2.5V (See Figure 2) 8 LSB

IN

+

= 2.5V (See Figure 2) 8 LSB

IN

l

VCC – 2.5 V

l

0V

l

–10

l

–10

l

–10

l

–10

l

–10 1 10 nA

1
1

1
1

CC

CC

CC

– 2.5 V

CC

10
10

10
10

nA
nA

nA
nA

V

V

V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

CC

I

CC

Supply Voltage

Supply Current
Conversion
Sleep

I2C INPUTS AND OUTPUTS

The l denotes the specifi cations which apply over the full operating temperature

l

2.7 5.5 V

l
l

800

0.2

1200

0.6

μA
μA

range, otherwise specifi cations are at TA = 25°C. (Notes 2, 7)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

IH

V

IL

I

I

V

HYS

V

OL

I

IN

C

I

C

B

High Level Input Voltage

Low Level Input Voltage

Digital Input Current

Hysteresis of Schmidt Trigger Inputs (Note 3)

Low Level Output Voltage (SDA) I = 3mA

Input Leakage 0.1VCC ≤ VIN ≤ 0.9V

Capacitance for Each I/O Pin

Capacitance Load for Each Bus Line

CC

l

0.7V

CC

l

l

–10 10 μA

l

0.05V

CC

l

l

l

10 pF

l

0.3V

CC

0.4 V

1μA

400 pF

V

V

V

2453fa

3

LTC2453

2.0

I2C TIMING CHARACTERISTICS

The
temperature range, otherwise specifi cations are at T

= 25°C. (Notes 2, 7)

A

l denotes the specifi cations which apply over the full operating

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

t

CONV

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)

t

BUF

t

OF

Conversion Time

SCL Clock Frequency

Hold Time (Repeated) START Condition

LOW Period of the SCL Pin

HIGH Period of the SCL Pin

Set-Up Time for a Repeated START Condition

Data Hold Time

Data Set-Up Time

Rise Time for SDA, SCL Signals (Note 6)

Fall Time for SDA, SCL Signals (Note 6)

Set-Up Time for STOP Condition

Bus Free Time Between a Stop and Start Condition

Output Fall Time V

IHMIN

to V

ILMAX

Bus Load CB 10pF to

l

l

l

l

l

l

l

l

l

l

l

l

l

13 16.6 23 ms

0 400 kHz

0.6

1.3

0.6

0.6

0 0.9

100 ns

20 + 0.1C

20 + 0.1C

B

B

0.6

1.3

20 + 0.1C

B

300 ns

300 ns

250 ns

400pF (Note 6)

t

SP

Input Spike Suppression

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. V

= 2.7V to 5.5V

CC

unless otherwise specifi ed.

+

V
V

REF

IN

= V

= V

–

– V

REF

+

– V

IN

, V

REF

REFCM

–

, –V

IN

≤ VIN ≤ V

REF

= (V

REF

REF

; V

+

+ V

INCM

–

)/2, FS = V

REF

= (V

+

–

– V

REF

;

REF

+

–

+ V

IN

)/2.

IN

Note 4. Integral nonlinearity is defi ned as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
Guaranteed by design and test correlation.

Note 5. Input sampling current is the average input current drawn from
the input sampling network while the LTC2453 is converting.

Note 6. C

= capacitance of one bus line in pF.

B

Note 7. All values refer to V
Note 8. A positive current is fl owing into the DUT pin.

l

IH(MIN

) and V

IL(MAX)

levels.

50 ns

Note 3. Guaranteed by design, not subject to test.

μs

μs

μs

μs

μs

μs

μs

TYPICAL PERFORMANCE CHARACTERISTICS

Integral Nonlinearity, VCC = 5V

2.0
VCC = 5V

+

= 5V

V

1.5

REF

–

= 0V

V

REF

1.0

0.5

0

INL (LSB)

–0.5

–1.0

–1.5

–2.0

–5

TA = –45°C, 25°C, 90°C

–3 –1 1 52–4 –2 0 4

DIFFERENTIAL INPUT VOLTAGE (V)

3

2453 G01

Integral Nonlinearity, VCC = 3V Maximum INL vs Temperature

2.0
VCC = 3V

+

= 3V

V

REF

1.5

1.0

INL (LSB)

–0.5

–1.0

–1.5

–2.0

–

= 0V

V

REF

0.5

0

–3

TA = –45°C, 25°C, 90°C

–2 –1 1

DIFFERENTIAL INPUT VOLTAGE (V)

0

4

(TA = 25°C, unless otherwise noted)

VCC = V

1.5

1.0

INL (LSB)

0.5

0

3

2

2453 G02

–50

+

= 5V, 4.1V, 3V

REF

–25 0 25 50

TEMPERATURE (°C)

75 100

2453 G03

2453fa

LTC2453

8

TYPICAL PERFORMANCE CHARACTERISTICS

Offset Error vs Temperature Gain Error vs Temperature Transition Noise vs Temperature

5

4

3

VCC = V

2

1

OFFSET ERROR (LSB)

VCC = V

0

–1

–50

+

= 3V

REF

VCC = V

+

= 5V

REF

02550

–25

TEMPERATURE (°C)

REF

+

= 4.1V

Transition Noise vs Output Code

3.0

2.5

REF

REF

+

= 3V

+

= 5V

VCC = V

2.0

1.5

VCC = V

1.0

TRANSITION NOISE RMS (μV)

0.5

75 100

2453 G04

5

4

VCC = V

3

2

GAIN ERROR (LSB)

1

VCC = V

0

–50

+

= 3V

REF

VCC = V

+

= 5V

REF

02550

–25

TEMPERATURE (°C)

REF

+

= 4.1V

Conversion Mode Power Supply
Current vs Temperature

1200

60Hz OUTPUT SAMPLE RATE

1000

VCC = 5V

800

600

400

CONVERSION CURRENT (μA)

200

VCC = 3V

VCC = 4.1V

(TA = 25°C, unless otherwise noted)

3.0

2.5

2.0

VCC = 4.1V

VCC = 5V VCC = 3V

0

–50

–25

02550

TEMPERATURE (°C)

75 100

2453 G05

1.5

1.0

TRANSITION NOISE RMS (μV)

0.5

Sleep Mode Power Supply
Current vs Temperature

250

200

150

100

SLEEP CURRENT (nA)

50

VCC = 5V

VCC = 4.1V

VCC = 3V

75 100

2453 G06

0

–32768 3276

–16384 163840

OUTPUT CODE

Average Power Dissipation vs
Temperature, V

10000

1000

100

10

AVERAGE POWER DISSIPATION (μW)

1

–50

25Hz OUTPUT SAMPLE RATE

10Hz OUTPUT SAMPLE RATE

1Hz OUTPUT SAMPLE RATE

–25 0 25 50

= 3V

CC

TEMPERATURE (°C)

75 100

2453 G07

2453 G10

0

–50

02550

–25

TEMPERATURE (°C)

Power Supply Rejection vs
Frequency at V

0

VCC = 4.1V

+

= 2.7V

V

REF

–

= 0V

V

REF

–20

+

= 1V

V

IN

–

= 2V

V

IN

–40

–60

REJECTIOIN (dB)

–80

–100

110

CC

1k

100

FREQUENCY AT VCC (Hz)

10k

100k

75 100

2453 G08

10M

1M

2453 G11

0

–50

02550

–25

TEMPERATURE (°C)

Conversion Time vs Temperature

21

20

VCC = 3V

19

18

VCC = 5V

17

16

CONVERSION TIME (ms)

15

14

–50

–25 0

TEMPERATURE (°C)

VCC = 4.1V

25 75

75 100

2453 G09

50 100

2453 G12

2453fa

5