参数资料
型号: LTC1402IGN#TRPBF
厂商: LINEAR TECHNOLOGY CORP
元件分类: ADC
英文描述: Serial 12-Bit, 2.2Msps Sampling ADC with Shutdown; Package: SSOP; No of Pins: 16; Temperature Range: -40°C to +85°C
中文描述: 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16
封装: 0.150 INCH, PLASTIC, SSOP-16
文件页数: 10/24页
文件大小: 280K
代理商: LTC1402IGN#TRPBF
18
LTC1402
Figure 14. DSP Serial Interface to TMS320C54x
HARDWARE INTERFACE TO TMS320C54x
The LTC1402 is a serial output ADC whose interface has
been designed for high speed buffered serial ports in fast
digital signal processors (DSPs). Figure 14 shows an
example of this interface using a TMS320C54X.
The buffered serial port in the TMS320C54x has direct
access to a 2kB segment of memory. The ADC’s serial data
can be collected in two alternating 1kB segments, in real
time, at the full 2.2Msps conversion rate of the LTC1402.
The DSP assembly code sets frame sync mode at the BFSR
pin to accept an external positive going pulse, and the
serial clock at the BCLKR pin to accept an external positive
edge clock. Buffers near the LTC1402 may be added to
drive long tracks to the DSP to prevent corruption of the
signal to LTC1402. This configuration is adequate to
traverse a typical system board, but source resistors at the
buffer outputs, and termination resistors at the DSP may
be needed to match the characteristic impedance of very
long transmission lines. If you need to terminate the DOUT
transmission line, buffer it first with one or two 74ACxx
gates. The TTL threshold inputs of the DSP port respond
properly to the 2.5V swing of the terminated transmission
lines. The OVDD supply output driver supply voltage can be
driven directly from the DSP.
APPLICATIONS INFORMATION
WU
U
1402 F14
11
16
15
10
9
3-WIRE SERIAL
INTERFACELINK
OVDD
CONV
SCK
LTC1402
DOUT
VCC
BFSR
BCLKR
TMS320C54x
BDR
OGND
CONV
CLK
5V
REF
B11
B10
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LTC1403ACMSE-1#PBF Serial 12-Bit, 2.8Msps Sampling ADCs with Shutdown; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C
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