LTC1286C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1286C' PDF : 24 Pages View PDF
TEST CIRCUITS
Voltage Waveforms for tdis
CS
VIH
LTC1286
CS
DOUT
WAVEFORM 1
(SEE NOTE 1)
90%
tdis
DOUT
WAVEFORM 2
(SEE NOTE 2)
10%
NOTE 1: WAVEFORM 1 IS FOR AN OUTPUT WITH INTERNAL CONDITIONS SUCH
THAT THE OUTPUT IS HIGH UNLESS DISABLED BY THE OUTPUT CONTROL.
NOTE 2: WAVEFORM 2 IS FOR AN OUTPUT WITH INTERNAL CONDITIONS SUCH
THAT THE OUTPUT IS LOW UNLESS DISABLED BY THE OUTPUT CONTROL.
LTC1286/98 • TC05
CLK
DOUT
LTC1298
Voltage Waveforms for ten
CS
LTC1286/LTC1298
Voltage Waveforms for ten
1
2
VOL
ten
B11
LTC1286/98 • TC06
DIN
START
CLK
1
2
3
4
DOUT
VOL
ten
B11
LTC1286/98 • TC07
APPLICATION INFORMATION
OVERVIEW
The LTC1286 and LTC1298 are micropower, 12-bit, suc-
cessive approximation sampling A/D converters. The
LTC1286 typically draws 250µA of supply current when
sampling at 12.5kHz while the LTC1298 nominally con-
sumes 350µA of supply current when sampling at
11.1 kHz. The extra 100µA of supply current on the
LTC1298 comes from the reference input which is inten-
tionally tied to the supply. Supply current drops linearly as
the sample rate is reduced (see Supply Current vs Sample
Rate). The ADCs automatically power down when not
performing conversions, drawing only leakage current.
They are packaged in 8-pin SO and DIP packages. The
LTC1286 operates on a single supply from 4.5V to 9V,
while the LTC1298 operates from a 4.5V to 5.5V supply.
Both the LTC1286 and the LTC1298 contain a 12-bit,
switched-capacitor ADC, a sample-and-hold, and a
serial port (see Block Diagram). Although they share
the same basic design, the LTC1286 and LTC1298
differ in some respects. The LTC1286 has a differential
input and has an external reference input pin. It can
measure signals floating on a DC common-mode volt-
age and can operate with reduced spans to 1V. Reduc-
ing the spans allows it to achieve 244µV resolution. The
LTC1298 has a two-channel input multiplexer and can
convert either channel with respect to ground or the
difference between the two. The reference input is tied
to the supply pin.
9
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