LTC203_15 Datasheet, PDF (1/16 Pages) Linear Technology – Micropower, Low Charge Injection, Quad CMOS Analog Switches

LTC201A/LTC202/LTC203
Micropower, Low Charge
Injection, Quad CMOS Analog Switches
FEATURES
■ _{Micropower Operation}
■ _{Single 5V or ±15V Supply Operation}
■ _{Low Charge Injection}
■ _{Low RON}
■ _{Low Leakage}
■ _{Guaranteed Break Before Make}
■ _{Latch Resistant Design}
■ _{TTL/CMOS Compatible}
■ _{Improved Second Source for DG2O1A/DG202}
U
KEY SPECIFICATIO S
■ _{Supply Current ................... I}⁺ _{= 40µA, I}^– _{= 5µA Max}
■ _{Charge Injection}
±15V Supplies ................................. ±25pC Max
Single 5V Supply .................................. 2pC Typ
■ _{RON ............................................................. 65Ω Typ}
■ _{Signal Range .................................................... ±15V}
DESCRIPTIO
The LTC^®201A, LTC202, and LTC203 are micropower,
quad CMOS analog switches which typically dissipate only
250µW from ±15V supplies and 40µW from a single 5V
supply. The switches have 65Ω typical on resistance
and a very high off resistance. A break-before-make
characteristic, inherent in these switches, prevents the
shorting of two channels. With a supply voltage of ±15V,
the signal range is ±15V. These switches have special
charge compensation circuitry which greatly reduces
charge injection to a maximum of ±25pC (±15V supplies).
The LTC201A, LTC202, and LTC203 are designed for
applications such as programmable gain amplifiers,
analog multiplexers, sample-and-hold circuits, precision
charge switching and remote switching. These three
devices are differentiated by the type of switch action, as
shown in the logic table.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Micropower 100Hz to 1MHz V-to-F Converter
V_IN
OV TO 5V
220k*
100Hz TRIM
(240k* TYP)
50k
+
1/2 LT ^®1178
–
2k
0.33µF
1.5M
12k
1N4148
47k
0.01µF
3pF
2N3906
1µF
NC
2N3904
74C14
10M
V_DD
CLK CD4024 Q7
RESET
V_SS
F_OUT
2µF
100Ω
1µF
1/2 LT1178
7V TO 10V
100k
10k
LT1004-2.5
LINEARITY IS 0.02%
QUIESCENT CURRENT IS 90µA
SUPPLY CURRENT IS 360µA AT 1MHz
*1%FILM RESISTOR
S1
S3
V⁺
IN2
IN3
IN1
IN4
GND
V^–
S4
S2
0.022µF ^D1
D3
500pF
POLYSTYRENE
LTC201A/LTC202
D4
D2
LTC201A/202/203•TA01
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