LTC222 Linear Technology Corporation, LTC222 Datasheet

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LTC222

Manufacturer Part Number
LTC222
Description
Ltc222 - Micropower, Low Charge Injection, Quad Cmos Analog Switches With Data Latches
Manufacturer
Linear Technology Corporation
Datasheet

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KEY SPECIFICATIO S
FEATURES
TYPICAL APPLICATIO
Micropower Operation
Single 5V or ±15V Supply Operation
Low Charge Injection
Low R
Low Leakage
Guaranteed Break Before Make
Latch Resistant Design
TLL/CMOS Compatible
Improved Second Source for DG221/DG222
Microprocessor Bus Compatible
Supply Current ..................... I
Charge Injection
R
Signal Range ..................................................... ±15V
ON
OV TO 5V
±15V Supplies ................................. ±25pC Max
Single 5V Supply .................................. 2pC Typ
............................................................... 65ΩTyp
ON
V
IN
V
5V
FS
GND
S1
S2
S3
S4
V
V
+
LTC221/LTC222
U
WR
IN4
IN3
IN2
IN1
D1
D2
D3
D4
Two-Channel, 12-Bit, Self Calibrating Data Acquisition System
+
U
= 40µA, I
+
LT1006
–15V
15V
150k
120Ω
= 5µA Max
DECODER
LOGIC
10k
Injection, Quad CMOS Analog
GND
–IN
IN
Switches with Data Latches
LTC1292
12-BIT
DATA BUS B0 – B3
DESCRIPTIO
ADC
The LTC
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 inter-
face directly to most microprocessor buses. The switches
have 65Ω typical on resistance and a very high off resis-
tance. 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.
5V
Micropower, Low Charge
, LTC and LT are registered trademarks of Linear Technology Corporation.
R1
CLK
D
CS
V
REF
OUT
®
ADDRESS BUS
221 and LTC222 are micropower, quad CMOS
V
FS
270Ω
100k
LT1027
SERIAL PORT
U
LTC221/LTC222
WR
15V
LTC221/222 • TA01
TO MICROPROCESSOR
e.g. TMS320C25
2212fa
1

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LTC222 Summary of contents

Page 1

... The LTC 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 inter- face directly to most microprocessor buses. The switches have 65Ω typical on resistance and a very high off resis- tance ...

Page 2

... 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 U ...

Page 3

... LTC221/LTC222 The denotes the specifications which apply + – = ±15V –15V, GND = 0V, unless noted. LTC221C/LTC222C MAX MIN TYP MAX 5 0 LTC221C/LTC222C MAX MIN TYP MAX 400 290 400 300 210 300 ±25 8 ±25 0.01 400 270 400 300 ...

Page 4

... V (V) S LTC221/222 • TPC02 + V = 15V – –15V T = 25° LTC221/222 • TPC04 LTC221C/LTC222C TYP MAX MIN TYP MAX 450 600 450 600 190 300 190 300 250 100 250 0.01 0.01 430 ...

Page 5

... IN1 LOGIC INPUT V 0 OFF LTC221/222 • AI01 Charge Injection Test Circuit 1000pF L LTC221 INX LTC221/222 • AI03 LTC222 INX ∆V O THE ERROR VOLTAGE IN COULOMBS IS ∆ CCRR-Channel to Channel Crosstalk Test Circuit 15V SIGNAL + GENERATOR 2Vp 100kHz INX V IN ANALYZER – ...

Page 6

... WR Setup Conditions 3V 1. LTC221 IN 0. 2.4V LTC222 In-Circuit ESD Test Circuit ANY SOURCE OR DRAIN PIN LTC221/ ESD TESTER LTC222 1. ±4kV 100pF – V 0.1µF GND LTC221/222 • TA07 WR Switching Time Test Circuit ...

Page 7

... LTC221/ LTC222 LT1006 – IN1 IN2 IN3 IN4 WR V – GND LTC221/LTC222 5V LT1027 15V 20kΩ 10kΩ TO MICROCONTROLLER 4.99kΩ e.g. HD64180 2.49kΩ DATA BUS B0 – LOGIC ADDRESS BUS DECODER LTC221/222 • AI11 2212fa 7 ...

Page 8

... LTC221/LTC222 U U APPLICATIO S I FOR ATIO CH0 CH1 CH2 CH3 V IN CH4 LTC1090 CH5 CH6 CH7 COM DGND 15V LTC221/ LTC222 – V GND 8-Channel, 14-Bit A/D Converter 5V ACLK SCLK OUT CS 1kΩ 1kΩ + REF – REF – V 1kΩ ...

Page 9

... RAD TYP .015 – .060 (0.380 – 1.520) .125 (1.143 – 1.651) (3.175) .014 – .026 MIN (0.360 – 0.660) OBSOLETE PACKAGE LTC221/LTC222 .840 (21.336) MAX .220 – .310 (5.588 – 7.874 .200 (5 ...

Page 10

... LTC221/LTC222 PACKAGE DESCRIPTIO .300 – .325 (7.620 – 8.255) .009 – .015 (0.229 – 0.381) +.035 .325 –.015 ( ) +0.889 8.255 –0.381 NOTE: INCHES 1. DIMENSIONS ARE MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) ...

Page 11

... N .053 – .069 (1.346 – 1.752) 0° – 8° TYP .014 – .019 (0.355 – 0.483) TYP LTC221/LTC222 .386 – .394 (9.804 – 10.008) NOTE .150 – .157 (3.810 – 3.988) ...

Page 12

... LTC221/LTC222 RELATED PARTS PART NUMBER DESCRIPTION LTC201/LTC202/LTC203 Micropower, Low Charge Injection, Quad CMOS Analog Switches DG201/DG202 Compatible LTC1380/LTC1393 8-Channel/4-Channel Analog Multiplexer with SMBus Interface LTC1390/LTC1391 8-Channel, Analog Multiplexer with Serial Interface Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 COMMENTS 3V to ± ...

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