LINER LTC1391IGN

LTC1391
8-Channel
Analog Multiplexer with
Cascadable Serial Interface
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DESCRIPTION
FEATURES
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The LTC ® 1391 is a high performance CMOS 8-to-1 analog
multiplexer. It features a serial digital interface that allows
several LTC1391s to be daisy-chained together, increasing the number of MUX channels available using a single
digital port.
Low RON: 45Ω
Single 2.7V to ±5V Supply Operation
Analog Inputs May Extend to Supply Rails
Low Charge Injection
Serial Digital Interface
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
The LTC1391 features a typical RON of 45Ω, a typical
switch leakage of 50pA and guaranteed break-beforemake operation. 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 current.
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APPLICATIONS
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The LTC1391 is available in 16-pin PDIP, SSOP and
narrow SO packages. For applications requiring 2-way
serial data transmission, see the LTC1390 data sheet.
Data Acquisition Systems
Communication Systems
Signal Multiplexing/Demultiplexing
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATION
3V, 8-Channel 12-Bit ADC
On-Resistance vs
Analog Input Voltage
3V
300
2
3
ANALOG
INPUTS
4
5
6
7
8
16
V+
15
D
14
–
V
13
S0
S1
S2
S3
S4
DOUT
LTC1391
DIN
S5
CS
S6
CLK
S7
GND
SERIAL INTERFACE
TO MUX AND ADC
0.1µF
OPTIONAL A/D
INPUT FILTER
1
2
3
4
VREF
VCC
+IN
CLK
LTC1285
–IN
DOUT
GND
CS/SHDN
1µF
8
TA = 25°C
250
7
ON-RESISTANCE (Ω)
1
6
5
12
11
10
9
V + = 2.7V
V – = 0V
200
150
100
50
V + = 5V
V – = –5V
0
–5 –4 –3 –2 –1 0 1 2 3
ANALOG INPUT VOLTAGE (V)
DATA IN
CLK
CS
DATA OUT
4
5
1391 TA02
1391 TA01
1
LTC1391
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ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
(Note 1)
TOP VIEW
Total Supply Voltage (V + to V –) .............................. 15V
Input Voltage
Analog Inputs ................... (V – – 0.3V) to (V + + 0.3V)
Digital Inputs ......................................... – 0.3V to 15V
Digital Outputs ..........................– 0.3V to (V + + 0.3V)
Power Dissipation.............................................. 500mW
Operating Temperature Range
LTC1391C ............................................... 0°C to 70°C
LTC1391I........................................... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
S0 1
16 V +
S1 2
15 D
S2 3
14 V –
S3 4
13 DOUT
S4 5
12 DIN
S5 6
11 CS
S6 7
10 CLK
S7 8
9
ORDER PART
NUMBER
LTC1391CGN
LTC1391CN
LTC1391CS
LTC1391IGN
LTC1391IN
LTC1391IS
GND
GN PACKAGE
N PACKAGE
16-LEAD PLASTIC SSOP 16-LEAD PDIP
S PACKAGE
16-LEAD PLASTIC SO
GN PART MARKING
1391
1391I
TJMAX = 125°C, θJA = 110°C/ W (GN)
TJMAX = 125°C, θJA = 70°C/ W (N)
TJMAX = 125°C, θJA = 100°C/ W (S)
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
V + = 5V, V – = – 5V, GND = 0V, TA = operating temperature range, unless otherwise specified.
SYMBOL PARAMETER
Switch
VANALOG Analog Signal Range
RON
On-Resistance
IS(OFF)
ID(OFF)
ID(ON)
Digital
VINH
VINL
IINL, IINH
VOH
VOL
Dynamic
fCLK
tON
tOFF
tOPEN
OIRR
QINJ
2
∆RON vs VS
∆RON vs Temperature
Off Input Leakage
Off Output Leakage
On Channel Leakage
High Level Input Voltage
Low Level Input Voltage
Input Current
High Level Output Voltage
Low Level Output Voltage
Clock Frequency
Enable Turn-On Time
Enable Turn-Off Time
Break-Before-Make Interval
Off Isolation
Charge Injection
CONDITIONS
(Note 2)
VS = ±3.5V
ID = 1mA
VS = 4V, VD = – 4V, VS = – 4V, VD = 4V
Channel Off
VS = 4V, VD = – 4V, VS = – 4V, VD = 4V
Channel Off
VS = VD = ±4V
Channel On
V + = 5.25V
V + = 4.75V
VIN = 5V, 0V
V + = 4.75V, IO = – 10µA
IO = – 360µA
V + = 4.75V, IO = 1.6mA
MIN
●
–5
TMIN
25°C
TMAX
45
20
0.5
±0.05
●
±0.05
●
±0.05
●
●
UNITS
5
75
75
120
V
Ω
Ω
Ω
%
%/°C
nA
nA
nA
nA
nA
nA
±5
±20
±5
±20
±5
±20
0.8
±5
●
●
MAX
2.4
●
2.4
●
(Note 2)
VS = 2.5V, RL = 1k, CL = 35pF
VS = 2.5V, RL = 1k, CL = 35pF
35
VS = 2VP–P, RL = 1k, f = 100kHz
RS = 0, CL = 1000pF, VS = 1V (Note 2)
TYP
4.74
4.50
0.5
260
100
155
70
±2
0.8
5
400
200
±10
V
V
µA
V
V
V
MHz
ns
ns
ns
dB
pC
LTC1391
ELECTRICAL CHARACTERISTICS
V + = 5V, V – = – 5V, GND = 0V, TA = operating temperature range, unless otherwise specified.
SYMBOL
Dynamic
CS(OFF)
CD(0FF)
Supply
I+
I–
PARAMETER
CONDITIONS
MIN
Input Off Capacitance
Output Off Capacitance
Positive Supply Current
Negative Supply Current
TYP
MAX
5
10
All Logic Inputs Tied Together, VIN = 0V or 5V
All Logic Inputs Tied Together, VIN = 0V or 5V
●
●
UNITS
pF
pF
15
– 15
40
– 40
µA
µA
TYP
MAX
UNITS
2.7
300
300
350
V
Ω
Ω
Ω
%
%/°C
nA
nA
nA
nA
nA
nA
V + = 2.7V, V – = GND = 0V, TA = operating temperature range, unless otherwise specified.
SYMBOL PARAMETER
Switch
VANALOG Analog Signal Range
RON
On-Resistance
IS(OFF)
ID(OFF)
ID(ON)
Digital
VINH
VINL
IINL, IINH
VOH
VOL
Dynamic
fCLK
tON
tOFF
tOPEN
QIRR
QINJ
CS(OFF)
CD(OFF)
Supply
I+
∆RON vs VS
∆RON vs Temperature
Off Input Leakage
Off Output Leakage
On Channel Leakage
High Level Input Voltage
Low Level Input Voltage
Input Current
High Level Output Voltage
Low Level Output Voltage
CONDITIONS
MIN
(Note 2)
VS = 1.2V
IO = 1mA
●
VS = 2.5V, VD = 0.5V; VS = 0.5V, VD = 2.5V (Note 3)
Channel Off
VS = 2.5V, VD = 0.5V; VS = 0.5V, VD = 2.5V (Note 3)
Channel Off
VS = VD = 0.5V, 2.5V (Note 3)
Channel On
V + = 3.0V
V + = 2.4V
VIN = 2.7V, 0V
V + = 2.7V, IO = – 20µA
IO = – 400µA
V + = 2.7V, IO = 20µA
IO = 400µA
250
20
0.5
±0.05
●
±0.05
●
±0.05
●
●
0.8
±5
●
●
2.0
●
(Note 2)
VS = 1.5V, RL = 1k, CL = 35pF (Note 4)
VS = 1.5V, RL = 1k, CL = 35pF (Note 4)
(Note 4)
VS = 2VP–P, RL = 1k, f = 100kHz
RS = 0, CL = 1000pF, VS = 1V (Note 2)
Positive Supply Current
All Logic Inputs Tied Together, VIN = 0V or 2.7V
125
●
±5
±20
±5
±20
±5
±20
2.0
●
Clock Frequency
Enable Turn-On Time
Enable Turn-Off Time
Break-Before-Make Interval
Off Isolation
Charge Injection
Input Off Capacitance
Output Off Capacitance
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
0
TMIN
25°C
TMAX
2.68
2.30
0.01
0.20
490
190
290
70
±1
5
10
0.2
0.8
5
800
400
±5
2
V
V
µA
V
V
V
V
MHz
ns
ns
ns
dB
pC
pF
pF
µA
Note 2: Guaranteed by Design.
Note 3: Leakage current with a single 2.7V supply is guaranteed by
correlation with the ±5V leakage current specifications.
Note 4: Timing specifications with a single 2.7V supply are guaranteed by
correlation with the ±5V timing specifications.
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LTC1391
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TYPICAL PERFORMANCE CHARACTERISTICS
Driver Output Low Voltage
vs Output Current
On-Resistance vs Temperature
0.65
1.2
1.0
OUTPUT VOLTAGE (V)
250
200
150
100
V + = 5V
V – = –5V
VS = 0V
50
TA = 25°C
1.1
V + = 2.7V
V – = 0V
VS = 1.2V
0.60
0.8
0.7
0.6
0.5
0.4
V + = 5V
V–
0.3
–20
20
40
60
0
TEMPERATURE (°C)
0
80
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT CURRENT (mA)
1391 G01
0.30
V + = 2.7V
V – = 0V
IO = 400µA
0.25
0.10
–40
–20
40
60
0
20
TEMPERATURE (°C)
80
1391 G03
5.0
4.0
–1.0
–1.5
V + = 5V
V – = –5V
–2.0
V + = 5V
V – = –5V
IO = 1.6mA
4.5
V + = 2.7V
V – = 0V
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
0.35
Driver Output High Voltage
vs Temperature
0
–2.5
–3.0
3.5
3.0
2.5
V + = 2.7V
V – = 0V
IO = 400µA
2.0
1.5
1.0
–3.5
–4.0
2.0
0.40
1391 G02
Driver Output High Voltage
vs Output Current
–0.5
0.45
0.15
0.1
0
–40
0.50
0.20
= –5V
0.2
V + = 5V
V – = –5V
IO = 1.8mA
0.55
V + = 2.7V
V – = 0V
0.9
OUTPUT VOLTAGE (V)
300
ON-RESISTANCE (Ω)
Driver Output Low Voltage
vs Temperature
0.5
TA =25°C
2.5
3.0
3.5
4.0
OUTPUT VOLTAGE (V)
4.5
5.0
0
–40
–20
40
60
0
20
TEMPERATURE (°C)
80
1391 G05
1391 G04
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PIN FUNCTIONS
S0, S1, S2, S3, S4, S5, S6, S7 (Pins 1, 2, 3, 4, 5, 6, 7,
8): Analog Multiplexer Inputs.
DOUT into three-state and enables the selected channel for
analog signal transmission.
GND (Pin 9): Digital Ground. Connect to system ground.
DIN (Pin 12): Digital Input (TTL/CMOS Compatible). Input
for the channel selection bits.
CLK (Pin 10): System Clock (TTL/CMOS Compatible). The
clock synchronizes the channel selection bits and the
serial data transfer from DIN to DOUT.
CS (Pin 11): Channel Select Input (TTL/CMOS Compatible). A logic high on this input enables the LTC1391 to
read in the channel selection bits and allows digital data
transfer from DIN to DOUT. A logic low on this input puts
4
DOUT (Pin 13): Digital Output (TTL/CMOS Compatible).
Output from the internal shift register.
V – (Pin 14): Negative Supply.
D (Pin 15): Analog Multiplexer Output.
V + (Pin 16): Positive Supply.
LTC1391
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APPLICATIONS INFORMATION
Multiplexer Operation
Figure 1 shows the block diagram of the components
within the LTC1391 required for MUX operation. The
LTC1391 uses DIN to select the active channel and the chip
select input, CS, to switch on the selected channel as
shown in Figure 2.
When CS is high, the input data on the DIN pin is latched
into the 4-bit shift register on the rising clock edge. The
input data consists of the “EN” bit and a string of three bits
for channel selection. If “EN” bit is logic high as illustrated
in the first input data sequence, it enables the selected
channel. After the clocking in of the last channel selection
bit B0, the CS pin must be pulled low before the next rising
clock edge to ensure correct operation. Once CS is pulled
low, the previously selected channel is switched off to
ensure a break-before-make interval. After a delay of tON,
the selected channel is switched on allowing signal transmission. The selected channel remains on until the next
falling edge of CS. After a delay of tOFF, the LTC1391
terminates the analog signal transmission and allows the
CLK
CONTROL
LOGIC
DIN
4-BIT SHIFT
REGISTER
CS
selection of next channel. If the “EN” bit is logic low, as
illustrated in the second data sequence, it disables all
channels and there will be no analog signal transmission.
Table 1 shows the various bit combinations for channel
selection.
Table 1. Logic Table for Channel Selection
ACTIVE CHANNEL
EN
B2
B1
BO
All Off
0
X
X
X
S0
1
0
0
0
S1
1
0
0
1
S2
1
0
1
0
S3
1
0
1
1
S4
1
1
0
0
S5
1
1
0
1
S6
1
1
1
0
S7
1
1
1
1
Digital Data Transfer Operation
The block diagram of Figure 3 shows the components
within the LTC1391 required for serial data transfer. When
CS is held high, data is fed into the 4-bit shift register and
then shifted to DOUT. Data appears at DOUT after the fourth
rising edge of the clock as shown in Figure 4. The last four
CLK
ANALOG
OUTPUT (D)
MUX
BLOCK
ANALOG INPUTS
(S0 TO S7)
CONTROL
LOGIC
DIN
4-BIT SHIFT
REGISTER
CS
DOUT
1391 F03
1391 • F01
Figure 1. Simplified Block Diagram of the MUX Operation
Figure 3. Simplified Block Diagram of the
Digital Data Transfer Operation
CLK
CS
DIN
EN
HIGH
B2
B1
EN LO
B0
B2
B1
B0
ANY ANALOG
INPUT
D
t ON
t OFF
1391 • F02
Figure 2. Multiplexer Operation
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LTC1391
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APPLICATIONS INFORMATION
bits clocked into the LTC1391 shift register before CS is
taken low select the MUX channel that is turned on. This
allows a series of devices, with the DOUT of one device
connected to the DIN of the next device, to be programmed
with a single data stream.
CLK
DIN
1
D1
2
D2
3
D3
4
D4
DOUT
D5
D1
D2
D3
D4
D5
To ensure that only one channel is switched on at any one
time, two sets of channel selection bits are needed for
DATA as shown in Figure 6. The first data sequence is used
to switch off one MUX and the second data sequence is
used to select one channel from the other MUX or
vice versa. In other words, if bit “ENA” is high and bit
“ENB” is low, one channel of MUX A is switched on and all
channels of MUX B are switched off. If bit “ENA” is low and
bit “ENB” is high, all channels at MUX A are switched off
and one channel of MUX B is switched on. Care should be
taken to ensure that only one LTC1391 is enabled at any
one time to prevent two channels from being enabled
simultaneously.
1391 • F04
Figure 4. Digital Data Transfer Operation
CLK
1
2
3
4
5
6
7
8
Multiplexer Expansion
Several LTC1391s can be daisy-chained to expand the
number of multiplexer inputs. No additional interface
ports are required for the expansion. Figure 5 shows two
LTC1391s connected at their analog outputs to form a
16-to-1 multiplexer at the input to an LTC1400 A/D converter.
2
3
ANALOG
INPUTS
4
5
6
7
8
1
2
3
ANALOG
INPUTS
4
5
6
7
8
V+
S1
D
S2
V–
S3
S4
S5
S6
S7
S1
D
S2
V–
S5
S6
S7
A2
A1
A0
ENB
B2
B1
B0
1391 • F06
Figure 6. Data Sequence for MUX Expansion
5V
+
OPTIONAL A/D
INPUT FILTER
1
2
15
14
DOUT
LTC1391
12
DIN
A
11
CS
10
CLK
9
GND
V+
S4
16
13
S0
S3
ENA
0.1µF
0.1µF
S0
DIN
–5V
5V
1
CS
+
10µF
VCC
VSS
AIN
CONV
LTC1400
3
VREF
CLK
0.1µF 4
GND
DOUT
0.1µF
10µF
10µF
–5V
0.1µF
8
7
+
6
5
DATA
OUT
16
15
14
13
DOUT
LTC1391
12
DIN
B
11
CS
10
CLK
9
GND
DATA IN
CS
CLK
1391 • F05
Figure 5. Daisy-Chaining Two LTC1391s for Expansion
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LTC1391
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TYPICAL APPLICATIONS
Daisy-Chaining Five LTC1391s
5V
0.1µF BYPASS CAPACITORS FROM
V + TO GND FOR EACH LTC1391
1
2
3
ANALOG
INPUTS
4
5
6
7
8
1
2
3
ANALOG
INPUTS
4
5
6
7
8
1
2
3
ANALOG
INPUTS
4
5
6
7
8
1
2
3
ANALOG
INPUTS
4
5
6
7
8
1
2
3
ANALOG
INPUTS
4
5
6
7
8
16
1
15
2
– 14
3
S0
V+
S1
D
S2
S3
S4
S5
S6
S7
V
LTC1391
13
DOUT
A
12
DIN
11
CS
10
CLK
9
GND
S0
V+
S1
D
S2
S3
S4
S5
S6
S7
S1
D
S4
S5
S6
S7
S1
D
S4
S5
S6
S7
V+
S1
D
S3
S4
S5
S6
S7
DATA
OUT
16
15
16
15
16
15
14
V–
LTC1391
13
DOUT
D
12
DIN
11
CS
10
CLK
9
GND
S0
S2
+IN
V
LTC1391
13
DOUT
C
12
DIN
11
CS
10
CLK
9
GND
V+
S3
7
CLK
LTC1286
6
–IN
DOUT
4
5
CS
GND
0.1µF
– 14
S0
S2
8
LTC1391
13
DOUT
B
12
DIN
11
CS
10
CLK
9
GND
V+
S3
VCC
14
V–
S0
S2
VREF
16
15
14
V–
LTC1391
13
DOUT
E
12
DIN
11
CS
10
CLK
9
GND
DATA IN
CS
CLK
1391 TA04
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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LTC1391
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PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
GN Package
16-Lead Plastic SSOP (Narrow 0.150)
(LTC DWG # 05-08-1641)
0.189 – 0.196*
(4.801 – 4.978)
0.015 ± 0.004
× 45°
(0.38 ± 0.10)
0.007 – 0.0098
(0.178 – 0.249)
0.053 – 0.068
(1.351 – 1.727)
0.009
(0.229)
REF
16 15 14 13 12 11 10 9
0.004 – 0.0098
(0.102 – 0.249)
0° – 8° TYP
0.016 – 0.050
(0.406 – 1.270)
0.008 – 0.012
(0.203 – 0.305)
0.229 – 0.244
(5.817 – 6.198)
0.0250
(0.635)
BSC
0.150 – 0.157**
(3.810 – 3.988)
* DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
GN16 (SSOP) 1098
1
2 3
5 6
4
7
8
N Package
16-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.130 ± 0.005
(3.302 ± 0.127)
0.300 – 0.325
(7.620 – 8.255)
0.009 – 0.015
(0.229 – 0.381)
(
0.015
(0.381)
MIN
+0.025
0.325 –0.015
+0.635
8.255
–0.381
)
0.770*
(19.558)
MAX
0.045 – 0.065
(1.143 – 1.651)
0.065
(1.651)
TYP
0.125
(3.175)
MIN
0.005
(0.127)
MIN
0.100 ± 0.010
(2.540 ± 0.254)
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
0.255 ± 0.015*
(6.477 ± 0.381)
0.018 ± 0.003
(0.457 ± 0.076)
N16 0695
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
S Package
16-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.386 – 0.394*
(9.804 – 10.008)
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
15
14
13
12
11
10
9
0.004 – 0.010
(0.101 – 0.254)
0° – 8° TYP
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
8
16
0.053 – 0.069
(1.346 – 1.752)
0.050
(1.270)
TYP
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
2
3
4
5
6
7
8
S16 0695
LTC1391
U
TYPICAL APPLICATION
Interfacing LTC1391 with LTC1257 for Demultiplex Operation
1
2
3
ANALOG
OUTPUTS
4
5
6
7
8
V+
S0
S1
D
S3
DOUT
LTC1391
DIN
S5
CS
S6
CLK
S7
TTL COMPATIBLE
AT V + = 5V
GND
5V ≤ V + ≤ 12V
15
14
V–
S2
S4
16
0.1µF
47k
13
12
OPTIONAL D/A
OUTPUT FILTER
11
10
1
9
2
DATA
CLK
CS
CLK
VCC
8
7
VOUT
LTC1257
6
3
LOAD
VREF
5
4
DOUT
GND
DIN
0.1µF
1391 TA03
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC1285
LTC1286
LTC1390
LTC1451
3V 12-Bit ADC
5V 12-Bit ADC
Serial-Controlled 8-to-1 Analog Multiplexer
5V 12-Bit DAC
Micropower, Auto Shutdown, SO-8 Package, SPI, QSPI + MICROWIRETM Compatible
Micropower, Auto Shutdown, SO-8 Package, SPI, QSPI + MICROWIRE Compatible
Low RON, Bidirectional Serial Interface, Low Power, 16-Pin SO
Complete VOUT DAC, SO-8 Package, Daisy-Chainable, Low Power
LTC1452
LTC1453
5V and 3V 12-Bit DAC
3V 12-Bit DAC
Multiplying VOUT DAC, SO-8 Package, Rail-to-Rail Output, Low Power
Complete VOUT DAC, SO-8 Package, Daisy-Chainable, Low Power
MICROWIRE is a trademark of National Semiconductor.
9
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977
1391f, sn1391 LT/GP 0896 7K • PRINTED IN USA
9
 LINEAR TECHNOLOGY CORPORATION 1995