LTC221/LTC222
Micropower, Low Charge
Injection, Quad CMOS Analog
Switches with Data Latches
DESCRIPTIO
The LTC
廬
221 and LTC222 are micropower, quad CMOS
analog switches which typically dissipate only 250碌W
from
鹵15V
supplies and 40碌W from a single 5V supply.
Onboard latches allow the LTC221 and LTC222 to inter-
face directly to most microprocessor buses. The switches
have 65鈩?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
鹵15V
with a supply voltage of
鹵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
鹵25pC
(鹵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.
FEATURES
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
Micropower Operation
Single 5V or
鹵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
KEY SPECIFICATIO S
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
Supply Current
Charge Injection
鹵15V
Supplies .................................
鹵25pC
Max
Single 5V Supply .................................. 2pC Typ
R
ON
............................................................... 65鈩yp
Signal Range .....................................................
鹵15V
..................... I
+
= 40碌A(chǔ), I
鈥?/div>
= 5碌A(chǔ) Max
TYPICAL APPLICATIO
LTC221/LTC222
WR
5V
V
+
GND
V
鈥?/div>
IN4
IN3
IN2
IN1
V
FS
V
IN
OV TO 5V
S3
S4
D3
D4
S1
S2
D1
D2
Two-Channel, 12-Bit, Self Calibrating Data Acquisition System
WR
LOGIC
DECODER
ADDRESS BUS
DATA BUS B0 鈥?B3
TO MICROPROCESSOR
e.g. TMS320C25
15V
5V
10k IN
+
LT1006
LTC1292
12-BIT
ADC
CLK
D
OUT
CS
SERIAL PORT
100k
鈥?/div>
150k
鈥揑N
GND
120鈩?/div>
鈥?5V
R1 V
REF
270鈩?/div>
LT1027
V
FS
15V
LTC221/222 鈥?TA01
U
U
U
2212fa
1
LTC222MJ相關(guān)型號(hào)PDF文件下載
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