LTC1417ACGN Linear Technology, LTC1417ACGN Datasheet - Page 29

• Manufacturer Part Number: LTC1417ACGN
• Description: IC A/D CONV 14BIT SAMPLNG 16SSOP
• Manufacturer: Linear Technology

Specifications of LTC1417ACGN

• Number Of Bits: 14
• Sampling Rate (per Second): 400k
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 27.5mW Unipolar; 44mW Bipolar
• Voltage Supply Source: Dual ±
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP (0.150", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

TYPICAL APPLICATIONS
*
*
GETDATAPSHX
*
*****************************************
* Setup indecies
*****************************************
*
*
*
*****************************************
* Initialize the LTC1417’s CONVST input *
* to a logic high before a conversion
* start
*****************************************
*
*
*
*****************************************
* Retrieve the MUX address from memory
* and send it to the DG408
*****************************************
*
*
*****************************************
* Initiate a LTC1417 conversion
*****************************************
*
*
*
*
*****************************************
* The next short loop ensures that the
* LTC1417’s conversion is finished
* before starting the SPI data transfer *
*****************************************
*
CONVENDLDAA
*
*
*
*
*
*************************************************************************
* This routine sends data to the LTC1417 and sets its MUX channel. The
* very first time this routine is entered produces invalid data. Each
* time thereafter, the data will correspond to the previous active
* CONVST signal sent to the LTC1417.
*************************************************************************
*
PSHY
PSHA
LDX
LDY
BSET
LDAA
ORAA
STAA
BCLR
BSET
ANDA
BPL
#$0
#$1000
PORTC,Y %01000000
PORTC
MUX
PORTC
PORTC,Y %01000000
PORTC,Y %01000000
PORTC
#%10000000
CONVEND
E-Clock frequencies, change the above value of $50 to a
value that ensures the SCK frequency is 2MHz or less.)
The X register is used as a pointer to the memory
locations that hold the conversion data
Capture the contents of PortC
“Add” the MUX address
Select the MUX channel
Retrieve the contents of port D
Look at Bit7
Bit7 = Hi; the LTC1417’s conversion is complete
Bit7 = Lo; the LTC1417’s conversion is not
complete
Branch to the loop’s beginning while Bit7
remains high
U
This sets PORTC, Bit6 output to a logic
high, forcing CONVST to a logic high
This sets PORTC, Bit6 output to a logic
low, initiating a conversion
This resets PORTC, Bit6 output to a logic
high, returning CONVST to a logic high
*
*
*
*
*
*
*
*
*
*
*
*
LTC1417
sn1417 1417fas
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