LTC1290C(Rev_C) View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1290C Datasheet PDF : 28 Pages
| |||
LTC1290
APPLICATI S I FOR ATIO
CS
SCLK
DIN
DOUT
SHIFT
MUX ADDRESS
IN
tSMPL
SAMPLE ANALOG
INPUT
48 TO 52
ACLK CYC
SHIFT RESULT OUT
AND NEW ADDRESS IN
DON’T CARE
B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
Figure 3. CS High During Conversion
LTC1290 F03
CS
SCLK
SHIFT
MUX ADDRESS
IN
tSMPL
SAMPLE ANALOG
INPUT
48 TO 52
ACLK CYC
SCLK MUST
REMAIN LOW
SHIFT RESULT OUT
AND NEW ADDRESS IN
DIN
DON’T CARE
DOUT
B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
LTC1290 F04
Figure 4. CS Low During Conversion (CS Must go High to Low Once to Insure Proper Operation in this Mode)
Microprocessor Interfaces
The LTC1290 can interface directly (without external hard-
ware) to most popular microprocessor (MPU) synchro-
nous serial formats (see Table 2). If an MPU without a
serial interface is used, then four of the MPU’s parallel port
lines can be programmed to form the serial link to the
LTC1290. Included here are two serial interface examples
and one example showing a parallel port programmed to
form the serial interface
Serial Port Microprocessors
Most synchronous serial formats contain a shift clock
(SCLK) and two data lines, one for transmitting and one for
receiving. In most cases data bits are transmitted on the
falling edge of the clock (SCLK) and captured on the rising
edge. However, serial port formats vary among MPU
manufactures as to the smallest number of bits that can be
sent in one group (e.g., 4-bit, 8-bit or 16-bit transfers).
They also vary as to the order in which the bits are
transmitted (LSB or MSB first). The following examples
show how the LTC1290 accommodates these differences.
14
Share Link: 