Datasheet LTC1390 (Analog Devices)

LTC1390 8-Channel Analog Multiplexer with Serial Interface
U FEATU S RE DESCRIPTIO
■
3-Wire Serial Digital Interface
The LTC®1390 is a high performance CMOS 8-to-1 analog ■ Data Retransmission Allows Series Connection multiplexer. It features a 3-wire digital interface with a with Serial A/D Converters bidirectional data retransmission feature, allowing it to be ■
Single 3V to
±
5V Supply Operation
wired in series with a serial A/D converter while using only ■ Analog Inputs May Extend to Supply Rails one serial port. The interface also allows several LTC1390s ■
Low Charge Injection
to be wired in series or parallel, increasing the number of ■ Low R MUX channels available using only a single digital port. All ON: 75Ω Max ■ Low Leakage: ±5nA Max the above features are also valid when LTC1390 operates ■ Guaranteed Break-Before-Make as a demultiplexer such as with a D/A converter. ■ TTL/CMOS Compatible for All Digital Inputs The LTC1390 features a typical RON of 45Ω, typical switch ■ Cascadable to Allow Additional Channels leakage of 50pA, and guaranteed break-before-make op- ■ Can Be Used as a Demultiplexer eration. Charge injection is ±10pC maximum. All digital inputs are TTL and CMOS compatible when operated from
O U
single or dual supplies. The inputs can withstand 100mA
APPLICATI S
fault currents. ■ Data Acquisition Systems ■ The LTC1390 is available in 16-pin PDIP and narrow SO Communication Systems ■ packages. Signal Multiplexing/Demultiplexing , LTC and LT are registered trademarks of Linear Technology Corporation.
O U TYPICAL APPLICATI
VCC VEE
ON-Resistance vs
VCC
Analog Input Voltage
OPTIONAL A/D 250 1 16 1 8 INPUT FILTER T CS V A = 25°C S0 V + CC 2 15 2 7 S1 D +IN CLK 200 3 LTC1390 14 LTC1096 3 6 ) V+ = 3V S2 V – –IN DOUT Ω V – = 0V 4 13 S3 DATA 2 4 5 ANALOG 150 GND V 5 12 REF INPUTS S4 DATA 1 6 11 S5 CS 100 7 10 S6 CLK VCC ON-RESISTANCE ( 8 9 V+ = 5V S7 GND 50 V – = – 5V 47k 3-WIRE DATA SERIAL CLK 0 INTERFACE LTC1390 • TA01 –5 –4 –3 –2 –1 0 1 2 3 4 5 TO MUX AND ADC CS ANALOG INPUT VOLTAGE, VS (V) LTC1390 • TA02 sn1390 1390fs 1