LTC1291DCN8 Linear Technology, LTC1291DCN8 Datasheet - Page 7

• Manufacturer Part Number: LTC1291DCN8
• Description: IC DATA ACQ SYSTEM 12BIT 8-DIP
• Manufacturer: Linear Technology
• Type: Data Acquisition System (DAS)r

Specifications of LTC1291DCN8

• Resolution (bits): 12 b
• Data Interface: Serial, Parallel
• Voltage Supply Source: Single Supply
• Voltage - Supply: 5V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Sampling Rate (per Second): -

The LTC1291 is a data acquisition component which
contains the following functional blocks:
1. 12-bit successive approximation capacitive A/D
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 LTC1291 communicates with microprocessors and
other external circuitry via a synchronous, half duplex,
4-wire serial interface (see Operating Sequence). The
clock (CLK) synchronizes the data transfer with each bit
A
TEST CIRCUITS
PPLICATI
converter
D
OUT
Voltage Waveforms for D
t
r
D
CLK
OUT
D
CS
IN
O
U
S
I FOR ATIO
OUT
START
U
Rise and Fall Times, t
1
W
2
t
f
Voltage Waveforms for t
U
1291 TC04
r
, t
2.4V
0.4V
f
3
being transmitted on the falling CLK edge and captured on
the rising CLK edge in both transmitting and receiving
systems.
The input data is first received and then the A/D conversion
result is transmitted (half duplex). Because of the half
duplex operation D
allowing transmission over just 3 wires: CS, CLK and
ADDRESS IN
CS
SHIFT MUX
4
D
CLK
OUT
D
IN
en
Voltage Waveforms for D
1
1 NULL
BIT
5
SHIFT A/D CONVERSION
RESULT OUT
D
OUT
0.8V
t
dDO
1
IN
0.8V
t
en
and D
Figure 1
OUT
OUT
D
IN
2
B11
Delay Time, t
may be tied together
1291 TC07
D
OUT
LTC1291
2
1291 TC03
dDO
2.4V
0.4V
1291 F01
1291fa
7