Linear Technology LTC1098LCS8, LTC1098L, LTC1096LAIS8, LTC1096LACS8, LTC1096LIS8 Datasheet

Final Electrical Specifications

SAMPLE FREQUENCY (kHz)

0.1

1

SUPPLY CURRENT, I

CC

(µA)

10

100

1000

1 10 100

1096/8 TA02

LTC1096L/LTC1098L

Low Voltage, Micropower

Sampling 8-Bit Serial I/O

A/D Converters

December 1995

EATU

F

■

Specified at 2.65V Minimum Supply

■

Maximum Supply Current: 80µA

■

Auto Shutdown to 1nA

■

8-Pin SO Package

■

On-Chip Sample-and-Hold

■

Conversion Time: 32µs

■

Sample Rates: 16.5ksps

■

I/O Compatible with SPI, MICROWIRETM, etc.

PPLICATI

A

■

Battery-Operated Systems

■

Remote Data Acquisition

■

Isolated Data Acquisition

■

Battery Monitoring

■

Temperature Measurement

RE

S

O

U
S

DUESCRIPTIO

The LTC®1096L/LTC1098L are 3V micropower, 8-bit suc­cessive approximation sampling A/D converters. They
typically draw only 40µ A of supply current when convert­ing and automatically power down to a typical supply
current of 1nA between conversions. They are packaged in
8-pin SO packages and operate on a 3V supply. These 8­bit, switched capacitor, successive approximation ADCs
include a sample-and-hold. The LTC1096L has a single
differential analog input. The LTC1098L offers a software
selectable 2-channel multiplexed input.

On-chip serial ports allow efficient data transfer to a wide
range of microprocessors and microcontrollers over three
wires. This, coupled with micropower consumption, makes
remote location possible and facilitates transmitting data
through isolation barriers.

The circuits can be used in ratiometric applications or with
an external reference. The high impedance analog inputs
and the ability to operate with reduced spans (to 1V full
scale) allow direct connection to sensors and transducers
in many applications, eliminating the need for gain stages.

, LTC and LT are registered trademarks of Linear Technology Corporation.

MICROWIRE is a registered trademark of National Semiconductor Corporation.

ANALOG INPUT

0V TO 3V RANGE

A

PPLICATITYPICAL

Samples at 200Hz and Runs Off a 3V Battery

1

CS/
SHDN

2

+IN

LTC1096L

3

–IN

4

GND



U

O

Supply Current vs Sample Rate10µW, SO-8 Package, 8-Bit A/D Converter

3V1µF

8



V

CC

7

CLK

6

D



OUT

V

REF

SERIAL DATA LINK

5

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen­tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

MPU



SERIAL DATA LINK

(MICROWIRE AND
SPI COMPATIBLE)

1096/8 TA01

1

LTC1096L/LTC1098L

TOP VIEW

+IN
–IN

GND

V

CC


CLK
D

OUT



V

REF

S8 PACKAGE

8-LEAD PLASTIC SO

CS/

SHDN





1

2

3

4

8

7

6

5

A

W

O

LUTEXI T

S

A

WUW

ARB

U
G

I

S

Supply Voltage (VCC) to GND................................... 12V

Voltage

Analog and Reference ................ –0.3V to V

CC

+ 0.3V

Digital Inputs......................................... –0.3V to 12V

Digital Outputs ........................... –0.3V to V

CC

+ 0.3V

Power Dissipation.............................................. 500mW

WU

/

PACKAGE

T

JMAX

Consult factory for Military grade parts.

O

RDER I FOR ATIO

= 150°C, θJA = 175°C/W

ORDER PART

NUMBER

LTC1096LACS8
LTC1096LAIS8
LTC1096LCS8
LTC1096LIS8

S8 PART MARKING

096LIA
1096LA
1096LI
1096L

(Notes 1 and 2)

Operating Temperature

LTC1096LAC/LTC1098LAC .................... 0°C to 70°C

LTC1096LAI/LTC1098LAI .................. –40°C to 85°C

LTC1096LC/LTC1098LC......................... 0°C to 70°C

LTC1096LI/LTC1098LI ....................... –40°C to 85°C

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

Lead Temperature (Soldering, 10 sec.)................ 300°C

U

(Note 3)

ORDER PART

NUMBER

LTC1098LACS8
LTC1098LAIS8
LTC1098LCS8
LTC1098LIS8

S8 PART MARKING

098LIA
1098LA
1098LI
1098L

CS/

SHDN

CH0
CH1

GND



T

JMAX

TOP VIEW

1

2

3

4

S8 PACKAGE

8-LEAD PLASTIC SO

= 150°C, θJA = 175°C/W

8

7

6

5



V

CC(VREF)

CLK



D

OUT

D

IN



WUW

UUU

RECO E DED OPERATI G CO DITIO S

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

CC

f

CLK

t

CYC

t

hDI

t

suCS

t

WAKEUP

t

suDI

t

WHCLK

t

WLCLK

t

WHCS

t

WLCS

Supply Voltage 2.65 4.0 V
Clock Frequency VCC = 2.65V 25 250 kHz
Total Cycle Time LTC1096L, f

Hold Time, DIN After CLK↑ VCC = 2.65V 450 ns
Setup Time CS↓ Before First CLK↑ (See Operating Sequence) VCC = 2.65V, LTC1096L 1 µs

Wakeup Time CS↓ Before First CLK↓ After First CLK↑ VCC = 2.65V, LTC1096L 10 µs
(See Figure 1, LTC1096L Operating Sequence)

Wakeup Time CS↓ Before MSBF Bit CLK↓ VCC = 2.65V, LTC1098L 10 µs
(See Figure 2, LTC1098L Operating Sequence)

Setup Time, DIN Stable Before CLK↑ VCC = 2.65V 1 µs
CLK High Time VCC = 2.65V 1.6 µs
CLK Low Time VCC = 2.65V 1.6 µs
CS High Time Between Data Transfer Cycles VCC = 2.65V 2 µs
CS Low Time During Data Transfer LTC1096L, f

LTC1098L, f

VCC = 2.65V, LTC1098L 1 µs

LTC1098L, f

= 250kHz 58 µs

CLK

= 250kHz 58 µs

CLK

= 250kHz 56 µs

CLK

= 250kHz 56 µs

CLK

2

LTC1096L/LTC1098L

UU W

CO VERTER A D ULTIPLEXER CHARACTERISTICS

V

= 2.65V, V

CC

= 2.5V, f

REF

= 250kHz, unless otherwise noted.

CLK

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

Resolution (No Missing Code) ● 8 8 Bits
Offset Error (Note 4) ● ±0.5 ±1 LSB
Linearity Error ● ±0.5 ±1 LSB
Full Scale Error ● ±0.5 ±1 LSB
Total Unadjusted Error (Note 5) V
Analog Input Range (Note 6) V
REF Input Range (Note 6) 2.65 ≤ VCC ≤ 4.0V V
Analog Input Leakage Current (Note 7) ● ±1 ±1 µA

= 2.5V ● ±1 ±1.5 LSB

REF

LTC1096LA/LTC1098LA

–0.05V to V
–0.05V to V

LTC1096L/LTC1098L

+ 0.05V

CC

+ 0.05V

CC

U
D

DIGITAL

VCC = 2.65V, V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

IH

V

IL

I

IH

I

IL

V

OH

V

OL

I

OZ

I

SOURCE

I

SINK

I

REF

I

CC

A

= 2.5V, f

REF

High Level Input Voltage VCC = 3.6V ● 1.9 V
Low Level Input Voltage VCC = 2.65V ● 0.45 V
High Level Input Current VIN = V
Low Level Input Current VIN = 0V ● –2.5 µA
High Level Output Voltage VCC = 2.65V, IO = 10µA ● 2.4 2.64 V

Low Level Output Voltage VCC = 2.65V, IO = 400µA ● 0.3 V
Hi-Z Output Leakage CS =High ● ±3 µA
Output Source Current V
Output Sink Current V
Reference Current CS = V

Supply Current CS = V

DC

CLK

LECTRICAL C CHARA TER ST

E

= 250kHz, unless otherwise noted.

CC

I

= 0V –10 mA

OUT

= V

OUT

≥ 200µs, f

t

CYC

= 58µs, f

t

CYC

LTC1096L, t

LTC1098L, t

= 360µA ● 2.1 2.50 V

O

CC

CC

CC

≤ 50kHz ● 3.500 7.5 µA

CLK

= 250kHz ● 35.00 50.0 µA

CLK

≥ 200µs, f

CYC

= 58µs, f

t

CYC

≥ 200µs, f

CYC

= 58µs, f

t

CYC

ICS

I

● 2.5 µA

15 mA

● 0.001 2.5 µA

● 0.001 ± 3 µA

≤ 50kHz ● 40 80 µA

CLK

= 250kHz ● 120 180 µA

CLK

≤ 50kHz ● 44 88 µA

CLK

= 250kHz ● 155 230 µA

CLK

3