LTC1850 Datasheet, PDF (28/28 Pages) Linear Technology – 8-Channel, 10-Bit/12-Bit, 1.25Msps Sampling ADCs

LTC1850/LTC1851
TYPICAL APPLICATIO
Data buffering using two IDT7202LA15 1k x 9-bit FIFOs
allows rapid collection of 1024 samples and simple inter-
face to low power, low speed, 8-bit microcontrollers. Data
and channel information are clocked in simultaneously
and read out as two bytes using READ HIGH FIFO and
READ LOW FIFO lines. In the event of bus contention,
resistors limit peak output current. If both FIFOs are read
completely or reset before a burst of conversions, the
empty, half full, and full flags from only one FIFO need to
be monitored. The retransmit inputs may also be tied
together. Retransmit may be used to read data repeatedly,
allowing a memory limited processor to perform trans-
form and filtering functions that would otherwise be
difficult.
INPUT
CONFIGURATION:
ALL 8 CHANNELS
SINGLE ENDED TO COM
CH0–CH7: 0V TO 4.096V 14
V_DD
5V
15
V_DD
10µF
LTC1851
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
OV_{DD 35}
10µF
0.1µF
M1 48
M0 36
5V
SHDN 47
5V
CS 46
CONVST 45
RD 44
WR 43
DIFF 42
A2 41
A1 40
A0 39
UNI/BIP 38
PGA
37
5V
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
DIFF_OUT/S6 17
A2_OUT/S5 18
A1_OUT/S4 19
A0_OUT/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
0.1µF
5V
28
2
IDT7202LA15
D8
Q8
13
24 _D7
18
Q7
8 × 1k
25 _D6
18
Q6
26 _D5
27 _D4
17
Q5
16
Q4
3 _D3
12
Q3
4 _D2
5 _D1
11
Q2
10
Q1
6 _D0
9
Q0
1 _WR
8 _FF
22 _RS
15
R READ_HIGH_FIFO
21
EF HIGH_FIFO_EMPTY
20
HF HIGH_FIFO_HALF_FULL
23
RT HIGH BYTE_FIFO_RETRANSMIT
XI GND
7
14
8-BIT
DATA BUS
D7
D6
D5
D4
D3
D2
D1
D0
HIGH_FIFO_FULL_FLAG
LOW_FIFO_FULL_FLAG
FIFO_RESET
0.1µF
5V
28
2
IDT7202LA15
D8
Q8
13
24 _D7
19
Q7
8 × 1k
25 _D6
18
Q6
26 _D5
Q5 ¹⁷
27 _D4
16
Q4
3 _D3
Q3 ¹²
4 _D2
11
Q2
5 _D1
10
Q1
6 _D0
9
Q0
1 _WR
15
R READ_LOW_FIFO
8 _FF
22 _RS
EF ²¹ LOW_FIFO_EMPTY
20
HF LOW_FIFO_HALF_FULL
RT ²³ LOW BYTE_FIFO_RETRANSMIT
XI GND
7
14
18501 TA01
RELATED PARTS
PART NUMBER
LTC1410
LTC1415
LTC1418
LTC1419
LTC1604
LTC1852/LTC1853
DESCRIPTION
12-Bit, 1.25Msps, ±5V ADC
12-Bit, 1.25Msps, Single 5V ADC
14-Bit, 200ksps, Single 5V ADC
Low Power 14-Bit, 800ksps ADC
16-Bit, 333ksps, ±5V ADC
10-Bit/12-Bit, 8-Channel, 400ksps ADCs
28 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^q FAX: [phone] ^q www.linear.com
COMMENTS
71.5dB SINAD at Nyquist, 150mW Dissipation
55mW Power Dissipation, 72dB SINAD
15mW, Serial/Parallel ±10V
True 14-Bit Linearity, 81.5dB SINAD, 150mW Dissipation
90dB SINAD, 220mW Power Dissipation, Pin Compatible with LTC1608
Pin-Compatible, Programmable Multiplexer and Sequencer
18501f
LT/TP 0303 2K • PRINTED IN THE USA
© LINEAR TECHNOLOGY CORPORATION 2001