LTC1285CS8
3V Micropower Sampling 12-Bit A/D Converters in SO-8 Packages

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Datasheet

Size: 412.91KB
Page: 24
PDF: LTC1285CS8.pdf
  • Description:
    3V Micropower Sampling 12-Bit A/D Converters in SO-8 Packages
  • MFG:
    LINER [Linear Technology]
 

Abstract


1
LTC1285/LTC1288
3V Micropower Sampling
12-Bit A/D Converters in
SO-8 Packages
n
12-Bit Resolution
n
8-Pin SO Plastic Package
n
Low Cost
n
Low Supply Current: 160?A Typ
n
Auto Shutdown to 1nA Typ
n
Guaranteed ±3/4LSB Max DNL
n
Single Supply 3V to 6V Operation
n
Differential Inputs (LTC1285)
n
2-Channel MUX (LTC1288)
n
On-Chip Sample-and-Hold
n
100?s Conversion Time
n
Sampling Rates:
7.5ksps (LTC1285)
6.6ksps (LTC1288)
n
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 160?A 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 (
?
A)
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
n
Pen Screen Digitizing
n
Battery-Operated Systems
n
Remote Data Acquisition
n
Isolated Data Acquisition
n
Battery Monitoring
n
Temperature Measurement
12?W, S0-8 Package, 12-Bit ADC
Samples at 200Hz and Runs Off a 3V Supply
3V1?F
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.

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