ltc1867l Linear Technology Corporation, ltc1867l Datasheet - Page 14

• Manufacturer Part Number: ltc1867l
• Description: Ltc1863l - Micropower, 3v, 12-bit, 8-channel 175ksps Adcs
• Manufacturer: Linear Technology Corporation

LTC1863L/LTC1867L
APPLICATIO S I FOR ATIO
14
(LTC1863L)
(LTC1867L)
CS/CONV
SDO
SDO
SCK
SDI
Figure 8. LTC1863L/LTC1867L Bipolar Transfer
Characteristics (Two’s Complement)
Hi-Z
Hi-Z
011...111
011...110
000...001
000...000
111...111
111...110
100...001
100...000
DON'T CARE
t
t
CONV
CONV
–FS/2
U
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)
MSB = D11
MSB = D15
FS = 2.5V
1LSB = FS/2
1LSB (LTC1863L) = 610µV
1LSB (LTC1867L) = 38.1µV
BIPOLAR
LSB
–1
U
ZERO
0V
SD
LSB
1
1
n
D10
D14 D13
0S
2
FS/2 – 1LSB
W
S1
D9
1863L7L F08
3
D12
S0
D8
4
COM UNI SLP
D11 D10
D7
5
D6
U
6
D5
D9
7
D4
D8
8
D7
D3
9
D2
D6
10
D5
D1
t
11
ACQ
D4
D0
12
Figure 9. LTC1863L/LTC1867L Unipolar Transfer
Characteristics (Straight Binary)
NOT NEEDED FOR LTC1863L
D3
111...111
111...110
100...001
100...000
011...111
011...110
000...001
000...000
13
D2
14
UNIPOLAR
D1
0V
15
ZERO
D0
16
INPUT VOLTAGE (V)
DON'T CARE
FS = 2.5V
1LSB = FS/2
1LSB (LTC1863L) = 610µV
1LSB (LTC1867L) = 38.1µV
n
FS – 1LSB
1863L7L F09
1863l7lfa
1863L7L F07