LTC1297DCN8 Linear Technology, LTC1297DCN8 Datasheet - Page 9

• Manufacturer Part Number: LTC1297DCN8
• Description: IC DATA ACQ SYSTEM 12BIT 8-DIP
• Manufacturer: Linear Technology
• Type: Data Acquisition System (DAS)r

Specifications of LTC1297DCN8

• Resolution (bits): 12 b
• Sampling Rate (per Second): 60k
• 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

D
A
Microprocessor Interfaces
The LTC1292/LTC1297 can interface directly (without
external hardware) to most popular microprocessors’
(MPU) synchronous serial formats (see Table 1). If an
MPU without a dedicated serial port is used, then three of
the MPU’s parallel port lines can be programmed to form
the serial link to the LTC1292/LTC1297. Included here are
one serial interface example and one example showing a
parallel port programmed to form the serial interface.
CLK
OUT
CS
D
CLK
PPLICATI
OUT
CS
t
SMPL
t
suCS
t
RECEIVED WORD
SMPL
Hi-Z
Hi-Z
D
O
MPU
CLK
OUT
CS
B11
U
B11
B10
S
B10
?
B9
I FOR ATIO
U
?
B9
B8
?
B8
Figure 1. Data Exchange Between LTC1292 and MC68HC11
1ST TRANSFER
B7
t
CONV
O
B7
t
BYTE 1
CONV
W
B6
B11
B11
B6
B5
B10
B10
B5
B4
B9
B9
LTC1297 Operating Sequence
B4
LTC1292 Operating Sequence
B3
U
B8
B8
B3
B2
B2
B1
t
B7
B1
CYC
t
CYC
B0
B0
Motorola SPI (MC68HC11)
The MC68HC11 has been chosen as an example of an MPU
with a dedicated serial port. This MPU transfers data MSB
first and in 8-bit increments. A dummy D
data register starts the SPI process. With two 8-bit transfers,
the A/D result is read into the MPU (Figure 1). For the
LTC1292 the first 8-bit transfer clocks B11 through B8 of
the A/D conversion result into the processor. The second
8-bit transfer clocks the remaining bits B7 through B0 into
B7
B1
B1
B6
B6
B2
B2
B5
B5
B3
2ND TRANSFER
B3
B4
B4
BYTE 2
B4
B4
B3
B3
B5
B5
B2
B2
B6
B6
B1
B1
B7
LTC1292/LTC1297
B7
B0
B0
B8
B8
B1
B9
POWER SHUTDOWN MODE
B9
B10
B10
B11
B11
IN
word sent to the
LTC1292/7 F01
LTC1292/7 AI01
LTC1292/7 AI02
t
SMPL
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