Datasheet

LTC2471/LTC2473
11
24713fb
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applicaTions inForMaTion
Figure 6. Read Sequence Timing Diagram
not accept the request and issues a NACK by leaving the
SDA line HIGH. If the conversion is complete, the LTC2471/
LTC2473 issue an ACK by pulling the SDA line LOW.
Following the ACK, the LTC2471/LTC2473 can output data.
The data output stream is 16 bits long and is shifted out
on the falling edges of SCL (see Figure 6).
The DATA INPUT/OUTPUT state is concluded once all 16
data bits have been read or after a STOP condition.
1 7 8 9 2 31 8
D8D13D14
MSB
D15RSDA
SCL
7-BIT
ADDRESS
START BY
MASTER
D7 D6 D5 D0
LSB
9 1 2 3 8 9
ACK BY
MASTER
NACK BY
MASTER
SLEEP DATA OUTPUT CONVERSION
24713 F06
ACK BY
LTC2471/LTC2473
Table 1. LTC2471/LTC2473 Output Data Format
SINGLE ENDED INPUT V
IN
(LTC2471)
DIFFERENTIAL INPUT VOLTAGE
V
IN
+
– V
IN
–
(LTC2473)
D15
(MSB)
D14 D13 D12...D2 D1 D0
(LSB)
CORRESPONDING
DECIMAL VALUE
≥V
REF
≥V
REF
1 1 1 1 1 1 65535
V
REF
– 1LSB V
REF
– 1LSB 1 1 1 1 1 0 65534
0.75 • V
REF
0.5 • V
REF
1 1 0 0 0 0 49152
0.75 • V
REF
– 1LSB 0.5 • V
REF
– 1LSB 1 0 1 1 1 1 49151
0.5 • V
REF
0 1 0 0 0 0 0 32768
0.5 • V
REF
– 1LSB –1LSB 0 1 1 1 1 1 32767
0.25 • V
REF
–0.5 • V
REF
0 1 0 0 0 0 16384
0.25 • V
REF
– 1LSB –0.5 • V
REF
– 1LSB 0 0 1 1 1 1 16383
0 ≤ –V
REF
0 0 0 0 0 0 0
The LTC2473 (differential input) output code is given by
INT(32767.5 • (V
IN
+
– V
IN
–
)/V
REF
+ 32767.5. The first bit
output by the LTC2473, D15, is the MSB, which is 1 for
V
IN
+
≥ V
IN
–
and 0 for V
IN
+
< V
IN
–
. This bit is followed by
successively less significant bits (D14, D13, …) until the
LSB is output by the LTC2473, see Table 1.
The LTC2471 (single-ended input) output code is a direct
binary encoded result, see Table 1.