参数资料
型号: LTC1605-2IG#TR
厂商: Linear Technology
文件页数: 7/20页
文件大小: 0K
描述: IC ADC 16BIT 5V SAMPLING 28SSOP
标准包装: 2,000
位数: 16
采样率(每秒): 100k
数据接口: 并联
转换器数目: 1
功率耗散(最大): 80mW
电压电源: 模拟和数字
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
供应商设备封装: 28-SSOP
包装: 带卷 (TR)
输入数目和类型: 1 个单端,双极
配用: DC1255A-A-ND - BOARD SAR ADC LTC1605
15
LTC1605-1/LTC1605-2
The circuit in Figure 16 is an example showing the LTC1605
16-bit A/D converter and LTC1391 8-channel MUX con-
nected to a 68HC11 controller. The LTC1605’s 16-bit data
output is read in two 8-bit bytes using Pins 6 (MSB, Bit7)
through 13 (Bit8, Bit0), connected to the HC11’s PORTC.
The MUX’s 4-bit serial address data is sent using the
controller’s SPI.
The process to convert a channel’s input signal is shown
in sample listing A. It begins with shifting in the MUX’s
channel data while the SS signal is a logic high. The MUX
channel address is latched on the falling edge of SS and the
chosen channel’s input is applied at the LTC1605’s input,
Pin 1. Through the processor’s PORTA, a low-going pulse
is applied to the LTC1605’s R/C pin, initiating a conver-
sion. The processor then monitors the BUSY output.
When this signal becomes a logic high, signaling the end
of conversion, the processor reads the high byte of the
conversion through PORTC. The low byte is read through
PORTC when the processor changes the BYTE signal to a
logic high. The timing relationship of the control signals
and data are shown in Figure 17.
Sample Listing A
*************************************************************************
*
* This example program selects the an LTC1391 MUX channel, initiates a *
* conversion, and retrieves conversion data. It stores the 16-bit data *
* in two consecutive memory locations. The program is designed for use *
* with the LTC1605’s /CS tied to ground (see timing diagram in
*
* Figure 17).
*
*************************************************************************
*
*****************************************
* 68HC11 register definitions
*
*****************************************
*
PORTA
EQU
$1000
Parallel port A
*
Use Bit0 as an input for the LTC1605’s /BUSY signal
*
Use Bit3 as an output driving the LTC1605’s BYTE
*
input
PIOC
EQU
$1002
Parallel I/O control register
*
“STAF,STAI,CWOM,HNDS, OIN, PLS, EGA,INVB”
PORTC
EQU
$1003
Port C data register
*
“Bit7,Bit6,Bit5,Bit4,Bit3,Bit2,Bit1,Bit0”
DDRC
EQU
$1007
Port D data direction register
*
“Bit7,Bit6,Bit5,Bit4,Bit3,Bit2,Bit1,Bit0”
*
1 = output, 0 = input
PORTD
EQU
$1008
Port D data register
*
“ -
, -
, SS* ,CSK ;MOSI,MISO,TxD ,RxD “
DDRD
EQU
$1009
Port D data direction register
SPCR
EQU
$1028
SPI control register
*
“SPIE,SPE ,DWOM,MSTR;SPOL,CPHA,SPR1,SPR0”
SPSR
EQU
$1029
SPI status register
*
“SPIF,WCOL, -
,MODF; -
, -
SPDR
EQU
$102A
SPI data register; Read-Buffer; Write-Shifter
*
* RAM variables to hold the LTC1605’s 14 conversion result
*
DIN1
EQU
$00
This memory location holds the LTC1605’s bits 15 - 08
DIN2
EQU
$01
This memory location holds the LTC1605’s bits 07 - 00
MUX
EQU
$02
This memory location holds the MUX address data
*
TYPICAL APPLICATIO S
U
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