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參數(shù)資料
| 型號(hào)： | LTC1287CI |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 3V Single Chip 12-Bit Data Acquisition System |
| 中文描述： | 3V的單芯片12位數(shù)據(jù)采集系統(tǒng) |
| 文件頁(yè)數(shù)： | 7/16頁(yè) |
| 文件大?。?/td> | 324K |
| 代理商： | LTC1287CI |
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LTC1287
7
TEST CIRCUITS
Voltage Waveforms for t
en
U
S
A
O
PPLICATI
IU
U
The LTC1287 is a data acquisition component which
contains the following functional blocks:
1. 12-bit successive approximation capacitive A/D
converter
2. Analog multiplexer (MUX)
3. Sample-and-hold (S/H)
4. Synchronous, half-duplex serial interface
5. Control and timing logic
DIGITAL CONSIDERATIONS
Serial Interface
The LTC1287 communicates with microprocessors and
other external circuitry via a synchronous, half-duplex,
three-wire serial interface (see Operating Sequence). The
clock (CLK) synchronizes the data transfer with each bit
being transmitted on the falling CLK edge. The LTC1287
does not require a configuration input word and has no D
IN
pin. It is permanently configured to have a single differen-
tial input and to operate in unipolar mode. A falling CS
initiates data transfer. The first CLK pulse enables D
OUT
.
After one null bit, the A/D conversion result is output on the
D
OUT
line with a MSB-first sequence followed by a LSB-
first sequence. With the half duplex serial interface the
D
OUT
data is from the current conversion. This provides
easy interface to MSB- or LSB-first serial ports. Bringing
CS high resets the LTC1287 for the next data exchange.
Logic Levels
The logic level standards for this supply range have not
been well defined. What standards that do exist are not
universally accepted. The trip point on the logic inputs of
the LTC1287 is 0.28
×
V
CC
. This makes the logic inputs
compatible with HC-type levels and processors that are
D
OUT
0.6V
t
en
B11
CS
CLK
LTC1287 TC07
CLK
t
CYC
CS
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
t
CONV
D
OUT
Hi-Z
t
SMPL
t
SMPL
LTC1287 F01
Figure 1. LTC1287 Operating Sequence
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1287CCN | 3V Single Chip 12-Bit Data Acquisition System |
| LTC1287BIJ | 3V Single Chip 12-Bit Data Acquisition System |
| LTC1287BIN | 3V Single Chip 12-Bit Data Acquisition System |
| LTC1287CIJ | 3V Single Chip 12-Bit Data Acquisition System |
| LTC1287CIN | 3V Single Chip 12-Bit Data Acquisition System |
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