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LTC1285IS8#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
1
LTC1285/LTC1288
3V Micropower Sampling
12-Bit A/D Converters in
SO-8 Packages
■
12-Bit Resolution
■
8-Pin SO Plastic Package
■
Low Cost
■
Low Supply Current: 160µA Typ
■
Auto Shutdown to 1nA Typ
■
Guaranteed ±3/4LSB Max DNL
■
Single Supply 3V to 6V Operation
■
Differential Inputs (LTC1285)
■
2-Channel MUX (LTC1288)
■
On-Chip Sample-and-Hold
■
100µs Conversion Time
■
Sampling Rates:
7.5ksps (LTC1285)
6.6ksps (LTC1288)
■
I/O Compatible with SPI, Microwire, etc.
The LTC
®
1285/LTC1288 are 3V micropower, 12-bit, suc-
cessive approximation sampling A/D converters. They
typically draw only 160µA of supply current when con-
verting and automatically power down to a typical supply
current of 1nA whenever they are not performing conver-
sions. They are packaged in 8-pin SO packages and
operate on 3V to 6V supplies. These 12-bit, switched-
capacitor, successive approximation ADCs include
sample-and-holds. The LTC1285 has a single differential
analog input. The LTC1288 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.
APPLICATIONS
U
SAMPLE FREQUENCY (kHz)
0.1
1
SUPPLY CURRENT (µA)
10
100
1000
1 10 100
LTC1285/88 • TA02
T
A
= 25°C
V
CC
= 2.7V
V
REF
= 2.5V
f
CLK
= 120kHz
Supply Current vs Sample Rate
■
Pen Screen Digitizing
■
Battery-Operated Systems
■
Remote Data Acquisition
■
Isolated Data Acquisition
■
Battery Monitoring
■
Temperature Measurement
12µW, S0-8 Package, 12-Bit ADC
Samples at 200Hz and Runs Off a 3V Supply
3V1µF
ANALOG INPUT
0V TO 3V RANGE
–IN
GND
V
CC
CLK
D
OUT
V
REF
LTC1285
MPU
(e.g., 8051)
P1.4
P1.3
P1.2
+IN
LTC1285/88 • TA01
CS/SHDN
6
5
8
7
3
4
1
2
SERIAL DATA LINK
FEATURES
DESCRIPTION
U
TYPICAL APPLICATIONS N
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
2
LTC1285/LTC1288
(Notes 1 and 2)
Power Dissipation.............................................. 500mW
Operating Temperature Range .................... 0°C to 70°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................ 300°C
PART MARKING
T
JMAX
= 150°C, θ
JA
= 130°C/W
Consult factory for Industrial and Military grade parts.
ORDER PART
NUMBER
LTC1285CN8
ORDER PART
NUMBER
LTC1285CS8
1285C
PART MARKING
ORDER PART
NUMBER
LTC1288CN8
ORDER PART
NUMBER
LTC1288CS8
1288C
T
JMAX
= 150°C, θ
JA
= 130°C/W
T
JMAX
= 150°C, θ
JA
= 175°C/W
T
JMAX
= 150°C, θ
JA
= 175°C/W
PACKAGE/ORDER INFORMATION
W
UU
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
ABSOLUTE MAXIMUM RATINGS
W
WW
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage (Note 3) LTC1285 2.7 6 V
LTC1288 2.7 6 V
f
CLK
Clock Frequency V
CC
= 2.7V (Note 4) 120 kHz
t
CYC
Total Cycle Time LTC1285, f
CLK
= 120kHz 125.0 µs
LTC1288, f
CLK
= 120kHz 141.5 µs
t
hDI
Hold Time, D
IN
After CLK↑ V
CC
= 2.7V 450 ns
t
suCS
Setup Time CS↓ Before First CLK↑ (See Operating Sequence) LTC1285, V
CC
= 2.7V 2 µs
LTC1288, V
CC
= 2.7V 2 µs
t
suDI
Setup Time, D
IN
Stable Before CLK↑ V
CC
= 2.7V 600 ns
t
WHCLK
CLK High Time V
CC
= 2.7V 3.5 µs
t
WLCLK
CLK Low Time V
CC
= 2.7V 3.5 µs
t
WHCS
CS High Time Between Data Transfer Cycles V
CC
= 2.7V 2 µs
t
WLCS
CS Low Time During Data Transfer LTC1285, f
CLK
= 120kHz 123.0 µs
LTC1288, f
CLK
= 120kHz 139.5 µs
RECOM ENDED OPERATING CONDITIONS
UUUU
W
W
1
2
3
4
8
7
6
5
TOP VIEW
V
REF
+IN
–IN
GND
V
CC
CLK
D
OUT
N8 PACKAGE
8-LEAD PDIP
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 PDIP
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 SO
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 SO
CS/SHDN
3
LTC1285/LTC1288
LTC1285 LTC1288
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 ±3 ±3/4 ±3 LSB
Gain Error ● ±2 ±8 ±2 ±8 LSB
Analog Input Range (Note 7 and 8) ● V
REF Input Range (LTC1285) 2.7 ≤ V
CC
≤ 6V V
(Notes 7, 8, and 9) V
Analog Input Leakage Current (Note 10) ● ±1 ±1 µA
1.5V to V
CC
+ 0.05V
–0.05V to V
CC
+ 0.05V
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
S/(N +D) Signal-to-Noise Plus Distortion Ratio 1kHz Input Signal 67 dB
THD Total Harmonic Distortion (Up to 5th Harmonic) 1kHz Input Signal –80 dB
SFDR Spurious-Free Dynamic Range 1kHz Input Signal 88 dB
Peak Harmonic or Spurious Noise 1kHz Input Signal –88 dB
DYNAMIC ACCURACY
UW
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
High Level Input Voltage V
CC
= 3.6V ● 2V
V
IL
Low Level Input Voltage V
CC
= 2.7V ● 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
= 2.7V, I
O
= 10µA ● 2.4 2.64 V
V
CC
= 2.7V, I
O
= 360µA ● 2.1 2.30 V
V
OL
Low Level Output Voltage V
CC
= 2.7V, I
O
= 400µA ● 0.4 V
I
OZ
Hi-Z Output Leakage CS = High ● ±3 µA
I
SOURCE
Output Source Current V
OUT
= 0V –10 mA
I
SINK
Output Sink Current V
OUT
= V
CC
15 mA
R
REF
Reference Input Resistance CS = V
IH
2700 MΩ
(LTC1285) CS = V
IL
54 kΩ
I
REF
Reference Current (LTC1285) CS = V
CC
● 0.001 2.5 µA
t
CYC
≥ 640µs, f
CLK
≤ 25kHz 50 µA
t
CYC
= 134µs, f
CLK
= 120kHz ● 50 70 µA
I
CC
Supply Current CS = V
CC
● 0.001 ±3.0 µA
LTC1285, t
CYC
≥ 640µs, f
CLK
≤ 25kHz 150 µA
LTC1285, t
CYC
= 134µs, f
CLK
= 120kHz ● 160 320 µA
LTC1288, t
CYC
≥ 720µs, f
CLK
≤ 25kHz 200 µA
LTC1288, t
CYC
= 150µs, f
CLK
= 120kHz ● 210 390 µA
DIGITAL AND DC ELECTRICAL CHARACTERISTICS
U
CONVERTER AND MULTIPLEXER CHARACTERISTICS
UW U
(Note 5)
(Note 5)
f
SMPL
= 7.5kHz (LTC1285), f
SMPL
= 6.6kHz (LTC1288) (Note 5)
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LTC1285IS8#TRPBF

Mfr. #:
Buy LTC1285IS8#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 3V uP Smpl 12-B A/D Convs in SO-8 Packag
Lifecycle:
New from this manufacturer.
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