LTC1852I View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1852I' PDF : 24 Pages View PDF
LTC1852/LTC1853
TYPICAL APPLICATION
Data buffering using two IDT7202LA15 1k x 9-bit FIFOs reset before a burst of conversions, the empty, half full,
allowsrapidcollectionof1024samplesandsimpleinterface and full flags from only one FIFO need to be monitored.
to low power, low speed, 8-bit microcontrollers. Data and The retransmit inputs may also be tied together. Retransmit
channel information are clocked in simultaneously and read may be used to read data repeatedly, allowing a memory
out as two bytes using READ HIGH FIFO and READ LOW limited processor to perform transform and filtering func-
FIFO lines. In the event of bus contention, resistors limit tions that would otherwise be difficult.
peak output current. If both FIFOs are read completely or
INPUT
CONFIGURATION:
ALL 8 CHANNELS
SINGLE ENDED TO COM
CH0–CH7: 0V TO 4.096V 14
VDD
5V
15
VDD
10μF
LTC1853
0.1μF
1 CH0
2 CH1
3 CH2
4 CH3
5 CH4
6 CH5
8-CHANNEL
MULTIPLEXER
INTERNAL
CLOCK
CONTROL LOGIC
AND
PROGRAMMABLE
SEQUENCER
5V
OVDD 35
10μF
0.1μF
M1 48
M0 36
SHDN 47 5V
CS 46 5V
CONVST 45
RD 44
WR 43
DIFF 42
A2 41
A1 40
A0 39
UNI/BIP 38
PGA 37 5V
0.1μF
5V
28
2
IDT7202LA15
D8
Q8
13
24 D7
18
Q7
8 × 1k
25 D6
18
Q6
26 D5
17
Q5
27 D4
16
Q4
3 D3
12
Q3
4 D2
11
Q2
5 D1
10
Q1
6 D0
9
Q0
1 WR
R
15
READ_HIGH_FIFO
8 FF
EF
21
HIGH_FIFO_EMPTY
22 RS
HF
20
HIGH_FIFO_HALF_FULL
RT
23
HIGH BYTE_FIFO_RETRANSMIT
XI GND
7
14
8-BIT
DATA BUS
D7
D6
D5
D4
D3
D2
D1
D0
7 CH6
8 CH7
9 COM
2.5V
10 REFOUT 2.5V
REFERENCE
+ 12-BIT
–
SAMPLING
ADC
11 REFIN
REF AMP
1μF
1.6384X
DATA
LATCHES
REFCOMP
12
4.096V
0.1μF
10μF
GND
13
GND
16
OUTPUT
DRIVERS
BUSY 33
DIFFOUT/S6 17
A2OUT/S5 18
A1OUT/S4 19
A0OUT/S3 20
D11/S2 21
D10/S1 22
D9/S0 23
D8 24
D7 25
D6 26
D5 27
D4 28
D3 29
D2 30
D1 31
D0 32
OGND 34
*CONVERT
CLOCK
UP TO 1024
HIGH_FIFO_FULL_FLAG
LOW_FIFO_FULL_FLAG
FIFO_RESET
0.1μF
5V
28
2
IDT7202LA15
D8
Q8
13
24 D7
Q7 19
8 × 1k
25 D6
18
Q6
26 D5
Q5 17
27 D4
16
Q4
3 D3
Q3 12
4 D2
11
Q2
5 D1
Q1 10
6 D0
Q0 9
1 WR
R 15 READ_LOW_FIFO
8 FF
EF 21 LOW_FIFO_EMPTY
22 RS
HF 20 LOW_FIFO_HALF_FULL
RT 23 LOW BYTE_FIFO_RETRANSMIT
XI GND
7
14
18523 TA03
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PART NUMBER DESCRIPTION
COMMENTS
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LTC1850/LTC1851 10-Bit/12, 8-Channel, 1.25Msps ADCs Pin-Compatible, Programmable Multiplexer and Sequencer
18523fa
24 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LT 0108 REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2001
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