Linear Technology LTC222CJ, LTC221CN, LTC221CJ, LTC222MJ, LTC222CS Datasheet

FEATURES

■

Micropower Operation

■

Single 5V or ±15V Supply Operation

■

Low Charge Injection

■

Low R

■

■

■

■

■

■

ON

Low Leakage
Guaranteed Break Before Make
Latch Resistant Design
TLL/CMOS Compatible
Improved Second Source for DG221/DG222
Microprocessor Bus Compatible

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KEY SPECIFICATIO S

■

Supply Current ..................... I+ = 40µA, I– = 5µA Max

■

Charge Injection

±15V Supplies .................................±25pC Max

Single 5V Supply .................................. 2pC Typ

■

RON............................................................... 65ΩTyp

■

Signal Range ..................................................... ±15V

LTC221/LTC222

Micropower, Low Charge

Injection, Quad CMOS Analog

Switches with Data Latches

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DESCRIPTIO

The LTC®221 and LTC222 are micropower, quad CMOS
analog switches which typically dissipate only 250µW
from ±15V supplies and 40µW from a single 5V supply.
Onboard latches allow the LTC221 and LTC222 to inter­face directly to most microprocessor buses. The switches
have 65Ω typical on resistance and a very high off resis­tance. A break before make characteristic is inherent in
these switches to prevent the shorting of two channels.
The signal range is ±15V with a supply voltage of ±15V and
0V to 5V with a single 5V supply. The switches have special
charge compensation circuitry which greatly reduces
charge injection to a maximum of ±25pC (±15V supplies).

The LTC221 and LTC222 are designed for applications
such as microprocessor controlled programmable gain
amplifiers, automatic test equipment, communication
systems, and data acquisition systems. The LTC221 is
normally closed and the LTC222 is normally open as
shown in the Logic Table.

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

TYPICAL APPLICATIO

V

OV TO 5V

LTC221/LTC222

+

V

5V

GND IN3

–

V

V

FS

IN

WR

IN4

IN2

IN1

D1S1

D2S2

D3S3

D4S4

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Two-Channel, 12-Bit, Self Calibrating Data Acquisition System

LOGIC

DECODER

DATA BUS B0 – B3

15V

+

LT1 006

–

–15V

10k

150k 100k

120Ω

–IN

GND

5V

LTC1292

IN

12-BIT

ADC

R1

ADDRESS BUS

CLK

D

OUT

CS

V

REF

270Ω

V

FS

SERIAL PORT

LT1027

WR

15V

LTC221/222 • TA01

TO MICROPROCESSOR
e.g. TMS320C25

2212fa

1

LTC221/LTC222

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

Voltages Referenced to V

+

V

...........................................................................................

GND..................................................................... 25V

Digital Inputs, S, D (Note 2) .......... –2V to (V+ 2V) or

Digital Inputs, S, D (N2020mA, Whichever Occurs First

Current

Any Input Except S or D ................................... 30mA

Continuous S or D ............................................ 20mA

Peak S or D

(Pulsed at 1 ms, 10% Duty Cycle Max) ......... 70mA

ESD Susceptibility (Note 3) ......................................4kV

Power Dissipation (Plastic) ............................... 500mW

Power Dissipation (Ceramic) ............................. 900mW

Operating Temperature Range

LTC221C/LTC222C .................................. 0°C to 70°C

LTC221M/LTC222M (OBSOLETE).......– 55°C to 125°C

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

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

–

44V

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W

PACKAGE/ORDER I FOR ATIO

TOP VIEW

IN1

D1

S1

V

GND

S4

D4

IN4

N PACKAGE

16-LEAD PDIP

= 110°C, θJA = 120°C/W

J

MAX

1

2

3

–

4

5

6

7

8

J PACKAGE

16-LEAD CERDIP

16

IN2

15

D2

14

S2

+

13

V

12

WR

11

S3

10

D3

9

IN3

S PACKAGE

16-LEAD PLASTIC SO

= 110°C, θJA = 130°C/W

J

MAX

OBSOLETE PACKAGE

Consider the N or S Package for Alternate Source

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ORDER PART

NUMBER

LTC221CN
LTC221CS
LTC222CN
LTC222CS

LTC221MJ
LTC221CJ
LTC222MJ
LTC222CJ

LOGIC TABLE

INX WR LTC221 LTC222

00 On Off

10 Off On

X1Maintain Previous State Maintain Previous State

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DIGITAL A D DC ELECTRICAL CHARACTERISTICS

over full operating temperature range, otherwise specifications are at TA = 25°C. V+ = ±15V, V– = –15V, GND = 0V, unless noted.

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

Analog Signal Range
R

ON

Off Input Leakage IS (OFF) VD = 14V, VS = ±14V 0.01 ±1 0.01 ±5nA

Off Output Leakage ID (0FF) VIN = 2.4V, LTC221 0.01 ±1 0.01 ±5nA

On Channel Leakage lD (ON) VD = VS = ±14V, VIN = 2.4V, LTC222 0.02 ±1 0.02 ±5nA

Input High Voltage V
Input Low Voltage V
Input High or Low Current VIN = 15V, 0V

I

, I

, I

INH

INL

WRH, IWRL

CS (OFF) 55pF
CD (OFF) 12 12 pF
CD, CS (ON) 30 30 pF

+

I

INH

INL

, V

, V

VS = ±10V T
ID = 1mA 25°C65906590Ω

VIN = 0.8V, LTC222

VIN = 0.8V, LTC221

WRH

WRL

VWR = 15V, 0V

All Channels On or Off 16 40 16 40 µA
VIN = VWR = 0V or 4.0V

T

MIN

MAX

●

●

●

●

●

2.4 2.4 V

●

●

●

The ● denotes the specifications which apply

LTC221M/LTC222M LTC221C/LTC222C

±15 ±15 V

90 90 Ω

135 135 Ω

±100 ±100 nA

±100 ±100 nA

±200 ±200 nA

0.8 0.8 V
±1 ±1 µA

60 60 µA

2212fa

2

LTC221/LTC222

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DIGITAL A D DC ELECTRICAL CHARACTERISTICS

over full operating temperature range, otherwise specifications are at T

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

–

I

= 25°C. V+ = ±15V, V– = –15V, GND = 0V, unless noted.

A

LTC221M/LTC222M LTC221C/LTC222C

0.1 5 0.1 5 µA

●

The ● denotes the specifications which apply

10 10

AC ELECTRICAL CHARACTERISTICS

V+ = 15V, V– = –15V, GND = 0V, unless otherwise noted.

LTC221M/LTC222M LTC221C/LTC222C

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

t

ON

t

OFF

t

OPEN

Off Isolation VS = 2Vp-p, RL = 1kΩ 75 75 dB

Crosstalk f = 100kHz 90 90

Charge Injection O

Total Harmonic Distortion THD VS = 2Vp-p, RL = 10kΩ 0.01 0.01 %

tON, WR VS = 2V, RL = 1kΩ, CL = 35pF 270 400 270 400 ns

t

, WR 160 300 160 300

OFF

INJ

VS = 2V, RL = 1kΩ, CL = 35pF 290 400 290 400 ns

210 300 210 300

20 85 20 85 ns

R

= 0Ω, CL = 1000pF, V

GEN

= 0 5 ±25 8 ±25 pC

GEN

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DIGITAL A D DC ELECTRICAL CHARACTERISTICS

over full operating temperature range, otherwise specifications are at TA = 25°C. V+ = 5V, V– = GND = 0V, unless noted.

LTC221M/LTC222M LTC221C/LTC222C

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

Analog Signal Range

R

ON

Off Input Leakage IS (OFF) VD = 4V, 1V; VS = 1V, 4V 0.01 ±1 0.01 ± 5nA

Off Output Leakage ID (0FF) 0.01 ±1 0.01 ±5nA

On Channel Leakage lD (ON) VD = VS = 1V, 4V 0.01 ±1 0.01 ± 5nA

Input High Voltage V

Input Low Voltage V

Input High or Low Current VIN = 5V, 0V
I

, I

, I

INH

INL

WRH, IWRL

CS(OFF) 5 5 pF

CD (OFF) 12 12 pF

CD, CS (ON) 30 30 pF

+

I

INH

INL

, V

, V

WRL

VS = 1.5V, 3V T

ID = 0.25mA 25°C 280 450 280 520 Ω

(Note 4)

(Note 4)

WRH

VWR = 5V, 0V

All Channels On or Off 8 20 8 20 µA

VIN = VWR = 0V or 4.0V

T

MIN

MAX

●

0505 V

●

●

●

●

2.4 2.4 V

●

●

●

The ● denotes the specifications which apply

450 520 Ω

650 650 Ω

±100 ±100 nA

±100 ±100 nA

±200 ±200 nA

0.8 0.8 V

±1 ±1 µA

30 30 µA

2212fa

3

LTC221/LTC222

AC ELECTRICAL CHARACTERISTICS

V+ = 5V, V– = GND = 0V, unless otherwise noted.

LTC221M/LTC222M LTC221C/LTC222C

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

t

ON

t

OFF

t

OPEN

Off Isolation VS = 2V

VS = 2V, RL = 1kΩ, CL = 35pF 450 600 450 600 ns

190 300 190 300 ns

100 250 100 250 ns

, RL = 1kΩ 75 75 dB

P-P

Crosstalk f = 100kHz 90 90 dB

Charge Injection O

INJ

Total Harmonic Distortion THD VS = 2V

R

= 0Ω, CL = 1000pF, V

GEN

, RL = 10kΩ 0.01 0.01 %

P-P

= 2.5V 2 2 pC

GEN

tON, WR VS = 2V, RL = 1kΩ, CL = 35pF 430 600 430 600 ns

t

, WR 160 300 160 300 ns

OFF

Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.

Note 2: Signals on S, D, or IN exceeding V

+

or V– will be clamped by

internal diodes. Limit forward diode current to maximum current rating.

Note 3: In-circuit ESD on the switch pins (S or D) exceeds 4kV (see test
circuit).

Note 4: Leakage current with a 5V supply is guaranteed by correlation with
the ±15V leakage current.

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TYPICAL PERFOR A CE CHARACTERISTICS

RON vs VS Over Supply Voltage

TA = 25°C

250

= 1mA

I

D

200

150

(Ω)

ON

R

100

50

0

–8

–16

–12–20 16

V

SUPPLY

±5V

±10V

–4

0

4

VS (V)

Positive Supply Current vs
Logic Input Voltage

250

200

150

(µA)

+

I

100

= 5V, OV

±15V

±20V

8

12

20

LTC221/222 • TPC01

ALL LOGIC INPUTS
TIED TOGETHER

ALL I

TIED TOGETHER

NX

WR TIED TO GROUND

(Ω)

ON

R

V+ = 15V

–

= –15V

V

= 25°C

T

A

RON vs VS Over Temperature RON vs VS Over Temperature

V+ = 5V

–

100

80

60

40

20

V+ = 15V

–

= –15V

V

= 1mA

I

D

0

–6

–12

–3

–9–15 12

0

VS (V)

125°C

25°C

–55°C

3

6

9

LTC221/222 • TPC02

15

500

= 0V

V

= 1mA

I

D

400

300

(Ω)

ON

R

200

100

0

10

2

125°C

25°C

–55°C

3

VS (V)

Positive Supply Current vs
Logic Input Voltage

250

V+ = 5V

–

= 0V

V

= 25°C

T

A

200

150

(µA)

+

I

100

ALL LOGIC INPUTS
TIED TOGETHER

ALL I

TIED TOGETHER

NX

WR TIED TO GROUND

4

LTC221/222 • TPC03

5

4

50

0

3

0

6

VIN (V)

9

12

LTC221/222 • TPC04

15

50

0

1

0

2

VIN (V)

3

4

LTC221/222 • TPC05

5

2212fa