LTC2408CG Linear Technology, LTC2408CG Datasheet - Page 31

• Manufacturer Part Number: LTC2408CG
• Description: IC A/D CONV 24BIT 8-CHAN 28-SSOP
• Manufacturer: Linear Technology

Specifications of LTC2408CG

• Number Of Bits: 24
• Sampling Rate (per Second): 7.5
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 1mW
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP (0.200", 5.30mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIONS
*
***************************************
* The SPI data transfer
***************************************
*
TRFLP1
*
WAIT1
*
*
*
*
*
*
LDAA
STAA
LDAA
BPL
LDAA
STAA
INX
CPX
BNE
BSET
PULA
PULY
PULX
RTS
CH10
CH11
CH12
CH13
CH14
CH15
CH8
CH9
#$0
SPDR
SPSR
SPDR
0,X
PORTD,Y %00100000 This sets the SS* output bit to a logic
1
2
3
4
5
6
7
8
U
S0
S1
S2
S3
S4
S5
S6
S7
LTC1391
Load accumulator A with a null byte for SPI transfer
This writes the byte into the SPI data register and
starts the transfer
This loop waits for the SPI to complete a serial
transfer/exchange by reading the SPI Status Register
WAIT1
MSB and is set to one at the end of an SPI transfer. The
branch will occur while SPIF is a zero.
Load accumulator A with the current byte of LTC2408 data
that was just received
Transfer the LTC2408’s data to memory
Increment the pointer
#DIN4+1 Has the last byte been transferred/exchanged?
TRFLP1 If the last byte has not been reached, then proceed to
the next byte for transfer/exchage
Restore the A register
Restore the Y register
Restore the X register
INFORMATION
U
Figure 29. Combining the LTC2408 with the LTC1391 for 16 Input Channels
D
CLK
OUT
D
CS
IN
D
15
10
11
13
12
*
The SPIF (SPI transfer complete flag) bit is the SPSR’s
high, de-selecting the LTC2408
Figure 28. LTC2408-68HC11 MCU Digital Interface Routine
W
TO
17
9
CH0 TO
CH7
LTC2408
1, 5, 6, 16, 18, 22, 27, 28
U
MUXOUT
7
4
ADCIN
24-BIT
GND
ADC
3
V
REF
V
CC
2, 8
CSMUX
CSADC
SDO
SCK
CLK
D
F
IN
O
26
23
20
25
19
21
24
5V
V
10 F
CC
LTC2404/LTC2408
2404/08
SS (PD5)
SCK (PD4)
MOSI (PD3)
MISO (PD2)
F29
68HC11
31