LTC1390_15 Datasheet, PDF (1/8 Pages) Linear Technology – 8-Channel Analog Multiplexer with Serial Interface

FEATURES
s _{3-Wire Serial Digital Interface}
s _{Data Retransmission Allows Series Connection}
with Serial A/D Converters
s _{Single 3V to ±5V Supply Operation}
s _{Analog Inputs May Extend to Supply Rails}
s _{Low Charge Injection}
s _{Low RON: 75Ω Max}
s _{Low Leakage: ±5nA Max}
s _{Guaranteed Break-Before-Make}
s _{TTL/CMOS Compatible for All Digital Inputs}
s _{Cascadable to Allow Additional Channels}
s _{Can Be Used as a Demultiplexer}
APPLICATI S
s _{Data Acquisition Systems}
s _{Communication Systems}
s _{Signal Multiplexing/Demultiplexing}
LTC1390
8-Channel
Analog Multiplexer
with Serial Interface
DESCRIPTIO
The LTC^®1390 is a high performance CMOS 8-to-1 analog
multiplexer. It features a 3-wire digital interface with a
bidirectional data retransmission feature, allowing it to be
wired in series with a serial A/D converter while using only
one serial port. The interface also allows several LTC1390s
to be wired in series or parallel, increasing the number of
MUX channels available using only a single digital port. All
the above features are also valid when LTC1390 operates
as a demultiplexer such as with a D/A converter.
The LTC1390 features a typical R_ON of 45Ω, typical switch
leakage of 50pA, and guaranteed break-before-make op-
eration. Charge injection is ±10pC maximum. All digital
inputs are TTL and CMOS compatible when operated from
single or dual supplies. The inputs can withstand 100mA
fault currents.
The LTC1390 is available in 16-pin PDIP and narrow SO
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATI
V_CC V_EE
1 _S0
V ^{+ 16}
2
S1
15
D
3 _S2 ^LTC1390 _{V –} 14
ANALOG ^{4 S3}
INPUTS ⁵ _S4
DATA 2 ¹³
DATA 1 ¹²
6 _S5
CS ¹¹
7 _S6
CLK ¹⁰
8 _S7
GND ⁹
3-WIRE
SERIAL
INTERFACE
TO MUX AND ADC
DATA
CLK
CS
OPTIONAL A/D
INPUT FILTER
V_CC
1
CS
8
V_CC
2
+IN
7
CLK
3
LTC1096
6
–IN
D_OUT
4
GND
5
V_REF
V_CC
47k
LTC1390 • TA01
ON-Resistance vs
Analog Input Voltage
250
T_A = 25°C
200
V⁺ = 3V
V ^– = 0V
150
100
V⁺ = 5V
50
V ^– = – 5V
0
–5 –4 –3 –2 –1 0 1 2 3 4 5
ANALOG INPUT VOLTAGE, V_S (V)
LTC1390 • TA02
sn1390 1390fs
1