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参数资料
| 型号： | LTC1289CIJ#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | ADC |
| 英文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP20 |
| 封装： | 0.300 INCH, LEAD FREE, CERDIP-20 |
| 文件页数： | 16/28页 |
| 文件大小： | 663K |
| 代理商： | LTC1289CIJ#PBF |
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LTC1289
1289fb
A “Quick Look” Circuit for the LTC1289
Users can get a quick look at the function and timing of the
LTC1289 by using the following simple circuit. REF+ and
DIN are tied to VCC selecting a 3V input span, CH7 as a
single-ended input, unipolar mode, MSB-first format and
16-bit word length. ACLK is driven by an external clock and
SCLK is driven by one half the clock rate. CS is driven at
1/128 the clock rate by the 74HC393 and DOUT outputs the
data. All other pins are tied to a ground plane. The output
data from the DOUT pin can be viewed on an oscilloscope
which is set up to trigger on the falling edge of CS.
A “Quick Look” Circuit for the LTC1289
Scope Trace of LTC1289 “Quick Look” Circuit
Showing A/D Output of 010101010101 (555HEX)
U
S
A
O
PPLICATI
TYPICAL
LTC1289 TA02
LTC1289
0.1
F
22
F
f
CHO
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
DGND
VIN
{
TO
OSCILLOSCOPE
74HC393
A1
CLR1
1QA
1QB
1QC
1QD
GND
VCC
A2
CLR2
2QA
2QB
2QC
2QD
CLOCK IN
2MHz MAX
3.0V
f/2
f/128
VCC
ACLK
SCLK
DIN
DOUT
CS
REF+
REF–
V–
AGND
ACLK
SCLK
CS
D
OUT
MSB
(B11)
DEGLITCHER
TIME
LSB
(B0)
FILLS
ZEROES
VERTICAL: 5V/DIV
HORIZONTAL: 2
s/DIV
SNEAK-A-BIT
TM
The LTC1289’s unique ability to software select the polar-
ity of the differential inputs and the output word length is
used to achieve one more bit of resolution. Using the
circuit below with two conversions and some software, a
2’s complement 12-bit + sign word is returned to memory
inside the MPU. The MC68HC05C4 was chosen as an
example, however, any processor that operates at 3.3V
could be used.
Two 12-bit unipolar conversions are performed: the first
over a 0V to 2.5V span and the second over a 0V to –2.5V
span (by reversing the polarity of the inputs). The sign of
the input is determined by which of the two spans con-
tained it. Then the resulting number (ranging from –4095
to +4095 decimal) is converted to 2’s complement nota-
tion and stored in RAM.
2.5V
1ST CONVERSION
(+) CH6
(–) CH7
0V
1ST CONVERSION
4096 STEPS
2ND CONVERSION
4096 STEPS
–2.5V
2ND CONVERSION
(–) CH6
(+) CH7
0V
VIN
2.5V
–2.5V
SOFTWARE
8191 STEPS
LTC1289 TA04
SNEAK-A-BIT
SNEAK-A-BIT is a trademark of Linear Technology Corp.
SNEAK-A-BIT Circuit
LTC1289 TA03
10
F
22
F
LT1019
–2.5
MC68HC05C4
SCLK
MOSI
MISO
CO
1k
–3.3V
0.1
F
2MHz
ACLK
+3.3V
OTHER CHANNELS
OR SNEAK-A-BIT
INPUTS
VIN
–2.5V TO +2.5V
LTC1289
CHO
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
DGND
VCC
ACLK
SCLK
DIN
DOUT
CS
REF+
REF–
V–
AGND
相关PDF资料 |
PDF描述 |
|---|---|
| LTC1289CIJ#TRPBF | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP20 |
| LTC1289BCJ#TRPBF | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP20 |
| LTC1289CIJ#TR | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP20 |
| LTC1289CCN#TR | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP20 |
| LTC1289BCJ#PBF | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1290BCJ | 制造商:Linear Technology 功能描述:ADC Single SAR 50ksps 12-bit Serial 20-Pin CDIP |
| LTC1290BCN | 功能描述:IC DATA ACQ SYS 12BIT 20-DIP RoHS:否 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| LTC1290BCN#PBF | 功能描述:IC DATA ACQ SYS 12BIT 20-DIP RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| LTC1290BCSW | 功能描述:IC DATA ACQ SYS 12BIT 20-SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| LTC1290BCSW#PBF | 功能描述:IC DATA ACQ SYS 12BIT 20-SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
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