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參數(shù)資料
| 型號： | LTC1199LIS8#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 6/28頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 10BIT 210KHZ W/SD 8-SOIC |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 位數(shù)： | 10 |
| 采樣率（每秒）： | 210k |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 25mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個單端，單極 |
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14
LTC1197/LTC1197L
LTC1199/LTC1199L
Dummy Bit
The dummy bit is a placeholder that extends the acquisi-
tion time of the ADC. This bit can be either high or low and
does not affect the conversion of the ADC.
Operation with DIN and DOUT Tied Together
The LTC1199/LTC1199L can be operated with DIN and
DOUT tied together. This eliminates one of the lines
required to communicate to the microprocessor (MPU).
Data is transmitted in both directions on a single wire. The
processor pin connected to this data line should be
configurable as either an input or an output. The LTC1199/
LTC1199L will take control of the data line and drive it low
on the 4th falling CLK edge after the start bit is received
(see Figure 3). Therefore the processor port line must be
switched to an input before this happens to avoid a
conflict.
In the Typical Applications section, there is an example of
interfacing the LTC1199/LTC1199L with DIN and DOUT
tied together to the Intel 8051 MPU.
Unipolar Transfer Curve
The LTC1197/LTC1197L/LTC1199/LTC1199L are perma-
nently configured for unipolar only. The input span and
code assignment for this conversion type are shown in the
following figures for a 5V reference.
1
2
3
4
CS
CLK
DATA (DIN/DOUT)
START
SGL/DIFF
ODD/SIGN
DUMMY
B9
NULL BITS
B8
LTC1199/LTC1199L CONTROL DATA LINE
AND SEND A/D RESULT BACK TO MPU
MPU CONTROLS DATA LINE AND SENDS
MUX ADDRESS TO LTC1199/LTC1199L
PROCESSOR MUST RELEASE
DATA LINE AFTER 4TH RISING CLK
AND BEFORE THE 4TH FALLING CLK
LTC1199/LTC1199L TAKE CONTROL OF
DATA LINE ON 4TH FALLING CLK
1197/99 F03
Figure 3. LTC1199/LTC1199L Operation with DIN and DOUT Tied Together
Unipolar Transfer Curve
0V
1LSB
V
REF
–
2LSB
V
REF
–
1LSB
V
REF
VIN
0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 0
1197/99 AI03
Unipolar Output Code
OUTPUT CODE
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 0
0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0
INPUT VOLTAGE
VREF – 1LSB
VREF – 2LSB
1LSB
0V
INPUT VOLTAGE
(VREF = 5.000V)
4.99512V
4.99023V
4.88mV
0V
1197/99 AI04
ACHIEVING MICROPOWER PERFORMANCE
With typical operating currents of 5mA (LTC1197/
LTC1199) at 5V and 0.8mA (LTC1197L/LTC1199L) at
2.7V it is possible for these ADCs to achieve true
micropower performance by taking advantage of the
automatic shutdown between conversions. In systems
APPLICATIO S I FOR ATIO
WU
UU
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