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LTC1286IS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
1
LTC1286/LTC1298
Micropower Sampling
12-Bit A/D Converters In
S0-8 Packages
■
12-Bit Resolution
■
8-Pin SOIC Plastic Package
■
Low Cost
■
Low Supply Current: 250µA Typ.
■
Auto Shutdown to 1nA Typ.
■
Guaranteed ±3/4LSB Max DNL
■
Single Supply 5V to 9V Operation
■
On-Chip Sample-and-Hold
■
60µs Conversion Time
■
Sampling Rates:
12.5 ksps (LTC1286)
11.1 ksps (LTC1298)
■
I/O Compatible with SPI, Microwire, etc.
■
Differential Inputs (LTC1286)
■
2-Channel MUX (LTC1298)
■
3V Versions Available: LTC1285/LTC1288
The LTC1286/LTC1298 are micropower, 12-bit, succes-
sive approximation sampling A/D converters. They typi-
cally draw only 250µA of supply current when converting
and automatically power down to a typical supply current
of 1nA whenever they are not performing conversions.
They are packaged in 8-pin SO packages and operate on
5V to 9V supplies. These 12-bit, switched-capacitor, suc-
cessive approximation ADCs include sample-and-holds.
The LTC1286 has a single differential analog input. The
LTC1298 offers a software selectable 2-channel MUX.
On-chip serial ports allow efficient data transfer to a wide
range of microprocessors and microcontrollers over three
wires. This, coupled with micropower consumption, makes
remote location possible and facilitates transmitting data
through isolation barriers.
These circuits can be used in ratiometric applications or
with an external reference. The high impedance analog
inputs and the ability to operate with reduced spans (to
1.5V full scale) allow direct connection to sensors and
transducers in many applications, eliminating the need for
gain stages.
5V4.7µF
ANALOG INPUT
–IN
GND
V
CC
CLK
D
OUT
V
REF
LTC1286
MPU
(e.g., 8051)
P1.4
P1.3
P1.2
+IN
0V TO 5V RANGE
LTC1286/98 • TA01
CS/SHDN
6
5
8
7
3
4
1
2
SERIAL DATA LINK
■
Battery-Operated Systems
■
Remote Data Acquisition
■
Battery Monitoring
■
Handheld Terminal Interface
■
Temperature Measurement
■
Isolated Data Acquisition
SAMPLE FREQUENCY (Hz)
0.1k
1
SUPPLY CURRENT (µA)
10
100
1000
1k 10k 100k
LTC1286/98 • TA02
T
A
= 25°C
V
CC
= V
REF
= 5V
f
CLK
= 200kHz
DESCRIPTION
U
25µW, S0-8 Package, 12-Bit ADC
Samples at 200Hz and Runs Off a 5V Supply
Supply Current vs Sample Rate
FEATURES
APPLICATIONS
U
TYPICAL APPLICATIONS N
U
2
LTC1286/LTC1298
1298
1298I
ORDER PART
NUMBER
LTC1286CN8
LTC1286IN8
T
JMAX
= 150°C, θ
JA
= 130°C/W
T
JMAX
= 150°C, θ
JA
= 175°C/W
ORDER PART
NUMBER
PACKAGE/ORDER INFORMATION
W
UU
ABSOLUTE MAXIMUM RATINGS
W
WW
(Notes 1 and 2)
Power Dissipation..............................................500mW
Operating Temperature Range
LTC1286C/LTC1298C............................. 0°C to 70°C
LTC1286I/LTC1298I........................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................ 300°C
Supply Voltage (V
CC
) to GND................................... 12V
Voltage
Analog and Reference ................ –0.3V to V
CC
+ 0.3V
Digital Inputs.........................................–0.3V to 12V
Digital Output ............................. –0.3V to V
CC
+ 0.3V
PART MARKING
1286
1286I
ORDER PART
NUMBER
LTC1298CN8
LTC1298IN8
ORDER PART
NUMBER
PART MARKING
LTC1298CS8
LTC1298IS8
LTC1286CS8
LTC1286IS8
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage (Note 3) LTC1286 4.5 9.0 V
LTC1298 4.5 5.5 V
f
CLK
Clock Frequency V
CC
= 5V (Note 4) 200 kHz
t
CYC
Total Cycle Time LTC1286, f
CLK
= 200kHz 80 µs
LTC1298, f
CLK
= 200kHz 90 µs
t
hDI
Hold Time, D
IN
After CLK↑ V
CC
= 5V 150 ns
t
suCS
Setup Time CS↓ Before First CLK↑ (See Operating Sequence) LTC1286, V
CC
= 5V 2 µs
LTC1298, V
CC
= 5V 2 µs
t
suDI
Setup Time, D
IN
Stable Before CLK↑ V
CC
= 5V 400 ns
t
WHCLK
CLK High Time V
CC
= 5V 2 µs
t
WLCLK
CLK Low Time V
CC
= 5V 2 µs
t
WHCS
CS High Time Between Data Transfer Cycles V
CC
= 5V 2 µs
t
WLCS
CS Low Time During Data Transfer LTC1286, f
CLK
= 200kHz 75 µs
LTC1298, f
CLK
= 200kHz 85 µs
RECOM ENDED OPERATING CONDITIONS
UUUU
W
W
Consult factory for military grade parts.
1
2
3
4
8
7
6
5
TOP VIEW
V
REF
+IN
–IN
GND
V
CC
CLK
D
OUT
N8 PACKAGE
8-LEAD PLASTIC DIP
CS/SHDN
1
2
3
4
8
7
6
5
TOP VIEW
CH0
CH1
GND
V
CC
(V
REF
)
CLK
D
OUT
D
IN
N8 PACKAGE
8-LEAD PLASTIC DIP
CS/SHDN
1
2
3
4
8
7
6
5
TOP VIEW
V
CC
(V
REF
)
CLK
D
OUT
D
IN
CH0
CH1
GND
S8 PACKAGE
8-LEAD PLASTIC SOIC
CS/SHDN
1
2
3
4
8
7
6
5
TOP VIEW
V
CC
CLK
D
OUT
V
REF
+IN
–IN
GND
S8 PACKAGE
8-LEAD PLASTIC SOIC
CS/SHDN
T
JMAX
= 150°C, θ
JA
= 130°C/W
T
JMAX
= 150°C, θ
JA
= 175°C/W
3
LTC1286/LTC1298
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
S/(N +D) Signal-to-Noise Plus Distortion Ratio 1kHz/7kHz Input Signal 71/68 dB
THD Total Harmonic Distortion (Up to 5th Harmonic) 1kHz/7kHz Input Signal –84/–80 dB
SFDR Spurious-Free Dynamic Range 1kHz/7kHz Input Signal 90/86 dB
Peak Harmonic or Spurious Noise 1kHz/7kHz Input Signal –90/–86 dB
f
SMPL
= 12.5kHz (LTC1286), f
SMPL
= 11.1kHz (LTC1298) (Note 5)
CONVERTER AND MULTIPLEXER CHARACTERISTICS
UW
U
(Note 5)
DYNAMIC ACCURACY
UW
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
High Level Input Voltage V
CC
= 5.25V ● 2V
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 ● 4.0 4.64 V
V
CC
= 4.75V, I
O
= 360µA ● 2.4 4.62 V
V
OL
Low Level Output Voltage V
CC
= 4.75V, I
O
= 1.6mA ● 0.4 V
I
OZ
Hi-Z Output Leakage CS = High ● ±3 µA
I
SOURCE
Output Source Current V
OUT
= 0V –25 mA
I
SINK
Output Sink Current V
OUT
= V
CC
45 mA
R
REF
Reference Input Resistance CS = V
CC
5000 MΩ
(LTC1286) CS = GND 55 kΩ
I
REF
Reference Current (LTC1286) CS = V
CC
● 0.001 2.5 µA
t
CYC
≥ 640µs, f
CLK
≤ 25kHz ● 90 140 µA
t
CYC
= 80µs, f
CLK
= 200kHz ● 90 140 µA
I
CC
Supply Current CS = V
CC
● 0.001 ±3.0 µA
LTC1286, t
CYC
≥ 640µs, f
CLK
≤ 25kHz ● 220 460 µA
LTC1286, t
CYC
= 80µs, f
CLK
= 200kHz ● 260 500 µA
LTC1298, t
CYC
≥ 720µs, f
CLK
≤ 25kHz ● 320 600 µA
LTC1298, t
CYC
= 90µs, f
CLK
= 200kHz ● 360 640 µA
(Note 5)
1.5V to V
CC
+ 0.05V
1.5V to 5.55V
–0.05V to V
CC
+ 0.05V
LTC1286 LTC1298
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Resolution (No Missing Codes) ● 12 12 Bits
Integral Linearity Error (Note 6) ● ±3/4 ±2 ±3/4 ±2 LSB
Differential Linearity Error ● ±1/4 ±3/4 ±1/4 ±3/4 LSB
Offset Error ● 3/4 ±33/4±3 LSB
Gain Error ● ±2 ±8 ±2 ±8 LSB
Analog Input Range (Note 7 and 8) ● V
REF Input Range (LTC1286) 4.5 ≤ V
CC
≤ 5.5V V
(Notes 7, 8, and 9) 5.5V < V
CC
≤ 9V V
Analog Input Leakage Current (Note 10) ● ±1 ±1 µA
DIGITAL AND DC ELECTRICAL CHARACTERISTICS
U
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LTC1286IS8#PBF

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Buy LTC1286IS8#PBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC uP Smpl 12-B A/D Convs In S0-8 Packages
Lifecycle:
New from this manufacturer.
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