LTC1292(RevB) 데이터 시트보기 (PDF) - Linear Technology
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LTC1292 Datasheet PDF : 24 Pages
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LTC1292/LTC1297
TEST CIRCUITS
CS
Voltage Waveforms for ten
CLK
DOUT
0.8V
ten
B11
LTC1292/7 TC07
APPLICATI S I FOR ATIO
The LTC1292/LTC1297 are data acquisition components
which contain the following functional blocks:
1. 12-Bit Succesive Approximation Capacitive A/D
Converter
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 DIN pin. They are permanently
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, tsuCS has to be met. Then the first CLK
pulse enables DOUT. After one null bit, the A/D conversion
result is output on the DOUT line with a MSB-first sequence
followed by a LSB-first sequence. With the half-duplex
serial interface the DOUT data is from the current conver-
sion. This provides easy interface to MSB-first or LSB-first
8
serial ports. Bringing CS high resets the LTC1292/LTC1297
for the next data exchange and puts the LTC1297 into its
power shutdown mode.
Table 1. Microprocessor with Hardware Serial Interfaces
Compatible with the LTC1292/LTC1297**
PART NUMBER
TYPE OF INTERFACE
Motorola
MC6805S2, S3
MC68HC11
MC68HC05
RCA
CDP68HC05
Hitachi
HD6305
HD6301
HD63701
HD6303
HD64180
National Semiconductor
COP400 Family
COP800 Family
NS8050U
HPC16000 Family
Texas Instruments
TMS7002
TMS7042
TMS70C02
TMS70C42
TMS32011*
TMS32020*
TMS370C050
SPI
SPI
SPI
SPI
SCI Synchronous
SCI Synchronous
SCI Synchronous
SCI Synchronous
SCI Synchronous
MICROWIRE†
MCROWIRE/PLUS†
MICROWIRE/PLUS
MICROWIRE/PLUS
Serial Port
Serial Port
Serial Port
Serial Port
Serial Port
Serial Port
SPI
* Requires external hardware
** Contact factory for interface information for processors not on this list
† MICROWIRE and MICROWIRE/PLUS are trademarks of National
Semiconductor Corp.
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