LTC1390 Linear Technology, LTC1390 Datasheet

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LTC1390

Manufacturer Part Number
LTC1390
Description
8-Channel Analog Multiplexer with Serial Interface
Manufacturer
Linear Technology
Datasheet

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FEATURE
A
TYPICAL
TO MUX AND ADC
PPLICATI
Data Acquisition Systems
Communication Systems
Signal Multiplexing/Demultiplexing
3-Wire Serial Digital Interface
Data Retransmission Allows Series Connection
with Serial A/D Converters
Single 3V to 5V Supply Operation
Analog Inputs May Extend to Supply Rails
Low Charge Injection
Low R
Low Leakage: 5nA Max
Guaranteed Break-Before-Make
TTL/CMOS Compatible for All Digital Inputs
Cascadable to Allow Additional Channels
Can Be Used as a Demultiplexer
INTERFACE
3-WIRE
SERIAL
ANALOG
ON
INPUTS
: 75 Max
DATA
A
S
CLK
CS
1
2
3
4
5
6
7
8
O
PPLICATI
S0
S1
S2
S3
S4
S5
S6
S7
U
LTC1390
S
DATA 2
DATA 1
GND
CLK
V
V
CS
D
+
16
15
14
13
12
11
10
9
O
V
CC
U
V
EE
OPTIONAL A/D
INPUT FILTER
1
2
3
4
CS
+IN
–IN
GND
LTC1096
D
The LTC
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
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.
V
, LTC and LT are registered trademarks of Linear Technology Corporation.
ESCRIPTIO
CC
D
V
CLK
V
OUT
REF
47k
CC
LTC1390 • TA01
8
7
6
5
®
V
1390 is a high performance CMOS 8-to-1 analog
CC
with Serial Interface
Analog Multiplexer
U
250
200
150
100
50
0
–5
T
A
–4
= 25 C
ANALOG INPUT VOLTAGE, V
–3
ON
Analog Input Voltage
ON-Resistance vs
–2
of 45 , typical switch
8-Channel
–1
V
V
V
V
+
+
= 3V
= 0V
= – 5V
LTC1390
= 5V
0
1
2
S
3
(V)
LTC1390 • TA02
1
4
5

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LTC1390 Summary of contents

Page 1

... 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. V ...

Page 2

... I = 360 4.75V 0.5mA ORDER PART TOP VIEW NUMBER + – LTC1390CN LTC1390CS 4 13 DATA DATA CLK 8 9 GND S PACKAGE 16-LEAD PLASTIC SO = 150 ( 150 C, = 100 C/ W (S) JA MIN TYP MAX – ...

Page 3

... Channel 2.7V 2.7V 400 2.7V 2.7V 300 A O LTC1390 MIN TYP MAX 5 260 400 100 200 35 155 MIN TYP MAX 0 3 255 200 255 300 20 0.5 0. ...

Page 4

... MAX 5 490 700 190 300 125 290 0.2 2 Driver Output High Voltage vs Output Current –1 – –5V DATA 2 –2 –3 –4 DATA 1 – 5 –6 –7 0.9 1.0 2.0 2.5 3.0 3.5 4.0 OUTPUT VOLTAGE (V) UNITS MHz 4.5 5.0 LTC1390 • G03 ...

Page 5

... APPLICATIO S I FOR ATIO Multiplexer Operation Figure 1 shows the block diagram of the components within the LTC1390 required for MUX operation. The LTC1390 uses Data 1 to select its 8 channels and a chip select input CS to switch on the selected channel as shown in Figure 2. CLK CONTROL ...

Page 6

... Several LTC1390s can be daisy-chained to expand the number of multiplexer inputs. No additional interface 0 0 ports are required for the expansion. Figure 5 shows two 0 1 LTC1390s connected at their analog outputs to form a 16 to-1 multiplexer at the input to an LTC1286 A/D converter ...

Page 7

... APPLICATIO S I FOR ATIO CLK DATA ENA ENB B2 DIGITAL INPUT FROM LTC1390 U TYPICAL APPLICATIONS + BYPASS CAPACITOR FROM V TO GND AND – GND REQUIRED FOR EACH LTC1390 LTC1390 – ...

Page 8

... LTC1390 U TYPICAL APPLICATIONS Interfacing LTC1390 with LTC1257 for Demultiplex Operation LTC1390 ANALOG 5 OUTPUTS DATA CLK CS PACKAGE DESCRIPTION 0.300 – 0.325 0.130 0.005 (7.620 – 8.255) (3.302 0.127) 0.015 (0.381) MIN 0.009 – 0.015 (0.229 – 0.381) ...

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