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LTC1292DIN8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
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LTC1292/LTC1297
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FEATURES
DESCRIPTIO
U
KEY SPECIFICATIO S
U
TYPICAL APPLICATIO
U
Single Chip 12-Bit
Data Acquisition Systems
■
Resolution: 12 Bits
■
Fast Conversion Time: 12µs Max Over Temp
■
Low Supply Current: 6.0mA
■
Shutdown Supply Current: 5µA (LTC1297)
■
Single Supply 5V Operation
■
Power Shutdown After Each Conversion (LTC1297)
■
Built-In Sample-and-Hold
■
60kHz Maximum Throughput Rate (LTC1292)
■
Direct 3-Wire Interface to Most MPU Serial Ports and
All MPU Parallel Ports
■
Analog Inputs Common Mode to Supply Rails
The LTC
®
1292/LTC1297 are data acquisition systems that
contain a 12-bit, switched-capacitor successive approxi-
mation A/D, a differential input, sample-and-hold on the
(+) input, and serial I/O. When the LTC1297 is idle between
conversions it automatically powers down reducing the
supply current to 5µA, typically. The LTC1292 is capable
of digitizing signals at a 60kHz rate and with the device’s
excellent AC characteristics, it can be used for DSP appli-
cations. All these features are packaged in an 8-pin DIP
and are made possible using LTCMOS
TM
switched-capaci-
tor technology.
The serial I/O is designed to communicate without external
hardware to most MPU serial ports and all MPU parallel
I/O ports allowing data to be transmitted over three wires.
Because of their accuracy, ease of use and small package
size these devices are well suited for digitizing analog
signals in remote applications where minimum number of
interconnects and power consumption are important.
12-Bit Differential Input Data Acquisition System
+
–
DIFFERENTIAL
INPUTS
COMMON MODE
RANGE
0V TO 5V
*
1N4148
V
REF
D
OUT
CLK
V
CC
LTC1297
+IN
GND
CS
–IN
LT1027
4.7µF
TANTALUM
8V TO 40V
1µF
22µF
TANTALUM
DO
MC68HC11
SCK
MISO
*FOR OVERVOLTAGE PROTECTION LIMIT THE INPUT CURRENT TO 15mA
PER PIN OR CLAMP THE INPUTS TO V
CC
AND GND WITH 1N4148 DIODES.
CONVERSION RESULTS ARE NOT VALID WHEN ANY INPUT IS OVERVOLTAGED
(V
IN
< GND OR V
IN
> V
CC
). SEE SECTION ON OVERVOLTAGE PROTECTION IN
THE APPLICATIONS INFORMATION.
LTC1292/7 TA01
5V
+
+
f
SAMPLE
(Hz)
10
AVERAGE I
CC
(µA)
100
1000
10000
1 100 10k
LTC1297• TA02
1
10
1k 100k
Power Supply Current
vs Sampling Frequency
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS is trademark of Linear Technology Corporation
2
LTC1292/LTC1297
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WU
U
PACKAGE
/
O
RDER I FOR ATIO
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
(Notes 1 and 2)
Supply Voltage (V
CC
) to GND.................................. 12V
Voltage
Analog and Reference
Inputs..................................... –0.3V to V
CC
+ 0.3V
Digital Inputs........................................ –0.3V to 12V
Digital Outputs .......................... –0.3V to V
CC
+ 0.3V
Power Dissipation.............................................. 500mW
Operating Temperature Range
LTC1292/LTC1297BC, LTC1292/LTC1297CC,
LTC1292/LTC1297DC ............................ 0°C to 70°C
LTC1292BI, LTC1292CI,
LTC1292DI ......................................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................ 300°C
ORDER PART NUMBER
T
JMAX
= 150°C, θ
JA
=100°C/W (J8)
CO VERTER A D ULTIPLEXER CHARACTERISTICS
UU W
N8 PACKAGE
8-LEAD PLASTIC DIP
1
2
3
4
TOP VIEW
CS
+IN
–IN
GND
J8 PACKAGE
8-LEAD CERAMIC DIP
8
7
6
5
V
CC
CLK
D
OUT
V
REF
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
Offset Error (Note 4) ● ±3.0 ±3.0 ±3.0 LSB
Linearity Error (INL) (Note 4 & 5) ● ±0.5 ±0.5 ±0.75 LSB
Gain Error (Note 4) ● ±0.5 ±1.0 ±4.0 LSB
Minimum Resolution for Which No 12 12 12 Bits
Missing Codes are Guaranteed
Analog and REF Input Range (Note 7) ● –0.05V to V
CC
+ 0.05V V
On Channel Leakage Current On Channel = 5V ● ±1 ±1 ±1 µA
(Note 8) Off Channel = 0V
On Channel = 0V ● ±1 ±1 ±1 µA
Off Channel = 5V
Off Channel Lekage Current On Channel = 5V ● ±1 ±1 ±1 µA
(Note 8) Off Channel = 0V
On Channel = 0V ● ±1 ±1 ±1 µA
Off Channel = 5V
LTC1292C
LTC1297C
LTC1292B
LTC1297B
LTC1292D
LTC1297D
LTC1292BIN8
LTC1292CIN8
LTC1292DIN8
LTC1292BCN8
LTC1292CCN8
LTC1292DCN8
Consult LTC Marketing for parts specified with wider operating temperature ranges.
T
JMAX
= 100°C, θ
JA
=130°C/W (N8)
LTC1292BCJ8 LTC1297BCJ8
LTC1292CCJ8 LTC1297CCJ8
LTC1292DCJ8 LTC1297DCJ8
LTC1297BCN8
LTC1297CCN8
LTC1297DCN8
The ● denotes the specifications
which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
3
LTC1292/LTC1297
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SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
CLK
Clock Frequency V
CC
= 5V (Note 6) (Note 9) 1.0 MHz
t
SMPL
Analog Input Sample Time See Operating Sequence LTC1292 1.5CLK
LTC1297 0.5CLK+5.5µs
t
CONV
Conversion Time See Operating Sequence 12 CLK
Cycles
t
CYC
Total Cycle Time See Operating Sequence LTC1292 14CLK+2.5µs
(Note 6) LTC1297 14CLK+6µs
t
dDO
Delay Time, CLK↓ to D
OUT
Data Valid See Test Circuits ● 160 300 ns
t
dis
Delay Time, CS↑ to D
OUT
Hi-Z See Test Circuits ● 80 150 ns
t
en
Delay Time, CLK↓ to D
OUT
Enabled See Test Circuits ● 80 200 ns
t
hDO
Time Output Data Remains Valid After CLK↓ 130 ns
t
f
D
OUT
Fall Time See Test Circuits ● 65 130 ns
t
r
D
OUT
Rise Time See Test Circuits ● 25 50 ns
t
WHCLK
CLK High Time V
CC
= 5V (Note 6) 300 ns
t
WLCLK
CLK Low Time V
CC
= 5V (Note 6) 400 ns
t
suCS
Setup Time, CS↓ Before CLK↑ V
CC
= 5V (Note 6) LTC1292 50 ns
(LTC1297 Wakeup Time) LTC1297 5.5 µs
t
WHCS
CS High Time Between Data Transfer Cycles V
CC
= 5V (Note 6) LTC1292 2.5 µs
LTC1297 0.5 µs
t
WLCS
CS Low Time During Data Transfer V
CC
= 5V (Note 6) LTC1292 14CLK
LTC1297 14CLK+5.5µs
C
IN
Input Capacitance Analog Inputs On Channel 100 pF
Analog Inputs Off Channel 5 pF
Digital Inputs 5 pF
AC CHARACTERISTICS
LTC1292B/LTC1297B
LTC1292C/LTC1297C
LTC1292D/LTC1297D
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
High Level Input Voltage V
CC
= 5.25V ● 2.0 V
V
IL
Low Level Input Voltage V
CC
= 4.75V ● 0.8 V
I
IH
High Level Input Current V
IN
= V
CC
● 2.5 µA
I
IL
Low Level Input Current V
IN
= 0V ● –2.5 µA
V
OH
High Level Output Voltage V
CC
= 4.75V, I
O
= –10µA 4.7 V
I
O
= 360µA ● 2.4 4.0 V
V
OL
Low Level Output Voltage V
CC
= 4.75V, I
O
= 1.6mA ● 0.4 V
I
OZ
High Z Output Leakage V
OUT
= V
CC
, CS High ● 3 µA
V
OUT
= 0V, CS High ● –3 µA
I
SOURCE
Output Source Current V
OUT
= 0V –20 mA
I
SINK
Output Sink Current V
OUT
= V
CC
20 mA
LTC1292B/LTC1297B
LTC1292C/LTC1297C
LTC1292D/LTC1297D
DIGITAL A D DC ELECTRICAL CHARACTERISTICS
U
The ● denotes the specifications which
apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
The ● denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. (Note 3)
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LTC1292DIN8#PBF

Mfr. #:
Buy LTC1292DIN8#PBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 12-Bit Serial I/O Diff Input ADC
Lifecycle:
New from this manufacturer.
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