LTC1292 LINER [Linear Technology], LTC1292 Datasheet - Page 8

• Manufacturer Part Number: LTC1292
• Description: Single Chip 12-Bit Data Acquisition Systems
• Manufacturer: LINER [Linear Technology]

LTC1292/LTC1297
8
TEST CIRCUITS
A
The LTC1292/LTC1297 are data acquisition components
which contain the following functional blocks:
1. 12-Bit Succesive Approximation Capacitive A/D
2. Differential Input
3. Sample-and-Hold (S/H)
4. Synchronous, Half-Duplex Serial Interface
5. Control and Timing Logic
DIGITAL CONSIDERATIONS
Serial Interface
The LTC1292/LTC1297 communicate with microproces-
sors and other external circuitry via a synchronous, half-
duplex, three-wire serial interface (see Operating Se-
quence). The clock (CLK) synchronizes the data transfer
with each bit being transmitted on the falling CLK edge.
The LTC1292/LTC1297 do not require a configuration
input word and have no D
configured to have a single differential input and to per-
form a unipolar conversion. A falling CS initiates data
transfer. To allow the LTC1297 to recover from the power
shutdown mode, t
pulse enables D
result is output on the D
followed by a LSB-first sequence. With the half-duplex
serial interface the D
sion. This provides easy interface to MSB-first or LSB-first
PPLICATI
Converter
D
CLK
OUT
CS
OUT
O
suCS
. After one null bit, the A/D conversion
U
OUT
S
OUT
has to be met. Then the first CLK
data is from the current conver-
I FOR ATIO
U
IN
line with a MSB-first sequence
pin. They are permanently
W
Voltage Waveforms for t
U
t
en
Table 1. Microprocessor with Hardware Serial Interfaces
Compatible with the LTC1292/LTC1297**
Motorola
RCA
Hitachi
National Semiconductor
Texas Instruments
** Contact factory for interface information for processors not on this list
serial ports. Bringing CS high resets the LTC1292/LTC1297
for the next data exchange and puts the LTC1297 into its
power shutdown mode.
* Requires external hardware
†
MICROWIRE and MICROWIRE/PLUS are trademarks of National
Semiconductor Corp.
0.8V
PART NUMBER
MC6805S2, S3
MC68HC11
MC68HC05
CDP68HC05
HD6305
HD6301
HD63701
HD6303
HD64180
COP400 Family
COP800 Family
NS8050U
HPC16000 Family
TMS7002
TMS7042
TMS70C02
TMS70C42
TMS32011*
TMS32020*
TMS370C050
en
B11
TYPE OF INTERFACE
SPI
SPI
SPI
SCI Synchronous
SCI Synchronous
SCI Synchronous
MICROWIRE/PLUS
Serial Port
Serial Port
Serial Port
Serial Port
Serial Port
Serial Port
SPI
SPI
SCI Synchronous
SCI Synchronous
MICROWIRE
MCROWIRE/PLUS
MICROWIRE/PLUS
LTC1292/7 TC07
†
†