參數(shù)資料
型號(hào)： LTC1859CG
廠商： Linear Integrated Systems
英文描述： 8-Channel, 12-/14-/16-Bit, 100ksps SoftSpan A/D Converters with Shutdown
中文描述： 8通道，12-/14-/16-Bit，100ksps的具有關(guān)斷SoftSpan的A / D轉(zhuǎn)換器
文件頁(yè)數(shù)： 15/20頁(yè)
文件大?。?/td> 265K
代理商： LTC1859CG
15
LTC1857/LTC1858/LTC1859
185789f
APPLICATIU
three-state at this time. When the conversion is complete
(BUSY goes high), CONVST and RD go low to enable the
data output for the previous conversion.
W
U
U
SERIAL DATA INPUT (SDI) INTERFACE
The
LTC1857/LTC1858/LTC1859
communicate with mi-
croprocessors and other external circuitry via a synchro-
nous, full duplex, 3-wire serial interface (see Figure 7).
The shift clock (SCK) synchronizes the data transfer with
each bit being transmitted on the falling SCK edge and
captured on the rising SCK edge in both transmitting and
receiving systems. The data is transmitted and received
simultaneously (full duplex).
An 8-bit input word is shifted into the SDI input which
configures the LTC1857/LTC1858/LTC1859 for the next
conversion. Simultaneously, the result of the previous
conversion is output on the SDO line. At the end of the data
exchange the requested conversion begins by applying a
rising edge on CONVST. After t
CONV
, the conversion is
complete and the results will be available on the next data
transfer cycle. As shown below, the result of a conversion
is delayed by one conversion from the input word re-
questing it.
SGL/
DIFF
SELECT
1
SELECT
0
UNI
GAIN
NAP
MUX ADDRESS
INPUT RANGE
POWER DOWN
SELECTION
1859 AI02
ODD
SIGN
SLEEP
SDI
SDO
SDO
WORD 0
SDI
WORD 1
DATA
TRANSFER
SDO
WORD 2
SDI
WORD 3
SDO
WORD 1
SDI
WORD 2
DATA
TRANSFER
t
CONV
CONVERSION
t
CONV
CONVERSION
1859 AI01
Figure 8. Examples of Multiplexer Options on the LTC1857/LTC1858/LTC1859
0
1
2
3
4
5
6
7
CHANNEL
COM (
–
)
8 Single-Ended
+
+
+
+
+
+
+
0,1
CHANNEL
{
4 Differential
2,3
4,5
6,7
+
(
–
)
–
(
+
)
+
+
(
–
)
–
(
+
)
+
(
–
)
–
(
+
)
+
(
–
)
–
(
+
)
4
5
6
7
CHANNEL
{
COM (
–
)
Combinations of
Differential and Single-Ended
+
+
+
+
+
+
–
–
0,1
2,3
COM (UNUSED)
Changing the
MUX Assignment “On the Fly”
COM (
–
)
2ND CONVERSION
4,5
6,7
4,5
1ST CONVERSION
+
–
+
–
+
+
+
–
7
6
{
{
{
{
{
{
{
1859 F08
MUX ADDRESS
SGL/
DIFF
SIGN
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
DIFFERENTIAL CHANNEL SELECTION
Table 1. Multiplexer Channel Selection
MUX ADDRESS
SGL/
DIFF
SIGN
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
SELECT
1 0
0
0
1
1
0
0
1
1
ODD
0
1
0
1
0
1
0
1
+
–
–
–
–
–
–
–
–
+
+
+
+
+
+
+
ODD
SELECT
1 0
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
+
–
+
–
+
–
+
–
–
+
–
+
–
+
–
+
0
1
2
3
4
5
6
7
0 1 2 3 4 5 6 7 COM
SINGLE-ENDED CHANNEL SELECTION
INPUT DATA WORD
The LTC1857/LTC1858/LTC1859 8-bit data word is clocked
into the SDI input on the first eight rising SCK edges.
Further inputs on the SDI pin are then ignored until the next
conversion. The eight bits of the input word are defined as
follows:
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