Datasheet

LTC1863L/LTC1867L
14
1863l7lfc
APPLICATIONS INFORMATION
Figure 7. Example 2, CS/CONV Starts a Conversion With Short Active HIGH Pulse.
With CS/CONV Returning LOW Before the Conversion, the ADC Remains Powered Up
INPUT VOLTAGE (V)
OUTPUT CODE
1863L7L F09
111...111
111...110
100...001
100...000
000...000
000...001
011...110
011...111
FS – 1LSB0V
UNIPOLAR
ZERO
FS = 2.5V
1LSB = FS/2
n
1LSB (LTC1863L) = 610μV
1LSB (LTC1867L) = 38.1μV
Figure 8. LTC1863L/LTC1867L Bipolar Transfer
Characteristics (Two’s Complement)
Figure 9. LTC1863L/LTC1867L Unipolar Transfer
Characteristics (Straight Binary)
S0SD 0S S1 COM UNI SLP
MSB = D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
CS/CONV
SCK
SDI
SDO
(LTC1867)
Hi-Z
12345678910111213141516
t
CONV
D12MSB = D15 D14 D13 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Hi-Z
1863L7L F07
t
CONV
DON'T CAREDON'T CARE
NOT NEEDED FOR LTC1863
t
ACQ
SDO
(LTC1863)
DON'T CARE
INPUT VOLTAGE (V)
0V
OUTPUT CODE (TWO’S COMPLEMENT)
–1
LSB
1863L7L F08
011...111
011...110
000...001
000...000
100...000
100...001
111...110
1
LSB
BIPOLAR
ZERO
111...111
FS/2 – 1LSB–FS/2
FS = 2.5V
1LSB = FS/2
n
1LSB (LTC1863L) = 610μV
1LSB (LTC1867L) = 38.1μV