ltc1867lign-trpbf Linear Technology Corporation, ltc1867lign-trpbf Datasheet - Page 14

• Manufacturer Part Number: ltc1867lign-trpbf
• Description: Ltc1863 - 12-bit, 8-channel 200ksps Adcs
• Manufacturer: Linear Technology Corporation

LTC1863/LTC1867
APPLICATIO S I FOR ATIO
14
(LTC1863)
(LTC1867)
CS/CONV
SDO
SCK
SDO
SDI
Hi-Z
Hi-Z
Figure 8. LTC1863/LTC1867 Bipolar Transfer
DON'T CARE
Characteristics (Two’s Complement)
t
t
CONV
CONV
011...111
011...110
000...001
000...000
111...111
111...110
100...001
100...000
U
–FS/2
With CS/CONV Returning LOW Before the Conversion, the ADC Remains Powered Up.
Figure 7. Example 2, CS/CONV Starts a Conversion with Short Active HIGH Pulse.
MSB = D11
MSB = D15
U
INPUT VOLTAGE (V)
SD
1
FS = 4.096
1LSB = FS/2
1LSB = (LTC1863) = 1mV
1LSB = (LTC1867) = 62.5 V
BIPOLAR
–1
LSB
ZERO
D10
D14 D13
0S
2
0V
LSB
W
S1
D9
1
n
3
D12
S0
D8
FS/2 – 1LSB
4
COM UNI SLP
D11 D10
1867 F08
D7
5
D6
6
U
D5
D9
7
D4
D8
8
D3
D7
9
D2
D6
10
D5
D1
t
11
ACQ
D4
D0
12
NOT NEEDED FOR LTC1863
Figure 9. LTC1863/LTC1867 Unipolar Transfer
D3
13
111...111
111...110
100...001
100...000
011...111
011...110
000...001
000...000
D2
14
Characteristics (Straight Binary)
D1
15
UNIPOLAR
0V
D0
ZERO
16
DON'T CARE
INPUT VOLTAGE (V)
FS = 4.096
1LSB = FS/2
1LSB = (LTC1863) = 1mV
1LSB = (LTC1867) = 62.5 V
n
FS – 1LSB
1867 F09
18637f
1867 F07