參數資料
型號: LTC1291CIN8
廠商: LINEAR TECHNOLOGY CORP
元件分類: ADC
英文描述: Single Chip 12-Bit Data Acquisition System
中文描述: 2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP8
封裝: PLASTIC, DIP-8
文件頁數: 7/20頁
文件大?。?/td> 376K
代理商: LTC1291CIN8
7
LTC1291
TEST CIRCUITS
Voltage Waveforms for D
OUT
Rise and Fall Times, t
r
, t
f
Voltage Waveforms for D
OUT
Delay Time, t
dDO
CLK
D
OUT
0.8V
t
dDO
0.4V
2.4V
1291 TC03
D
OUT
0.4V
2.4V
t
r
t
f
1291 TC04
Voltage Waveforms for t
en
D
OUT
CS
START
0.8V
t
en
B11
1291 TC07
1
2
3
4
5
D
IN
CLK
U
S
A
The LTC1291 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
O
PPLICATI
U
U
being transmitted on the falling CLK edge and captured on
the rising CLK edge in both transmitting and receiving
systems.
DIGITAL CONSIDERATIONS
Serial Interface
The LTC1291 communicates with microprocessors and
other external circuitry via a synchronous, half duplex,
four-wire serial interface (see Operating Sequence). The
clock (CLK) synchronizes the data transfer with each bit
Figure 1
The input data is first received and then the A/D conversion
result is transmitted (half duplex). Because of the half
duplex operation D
IN
and D
OUT
may be tied together
allowing transmission over just 3 wires: CS, CLK and
CS
D
OUT
1
D
IN
1
SHIFT MUX
ADDRESS IN
1 NULL
BIT
SHIFT A/D CONVERSION
RESULT OUT
1291 F01
D
IN
2
D
OUT
2
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