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參數(shù)資料
| 型號： | LTC1289CCSW#TR |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 18/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DATA ACQ SYS 12BIT 3V 20SOIC |
| 標準包裝： | 1,000 |
| 類型： | 數(shù)據(jù)采集系統(tǒng)（DAS） |
| 分辨率（位）： | 12 b |
| 采樣率（每秒）： | 25k |
| 數(shù)據(jù)接口： | 串行，并聯(lián) |
| 電壓電源： | 雙 ± |
| 電源電壓： | ±3.3V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 20-SOIC |
| 包裝： | 帶卷 (TR) |
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LTC1289
1289fb
U
S
A
O
PPLICATI
TYPICAL
Power Shutdown
For battery-powered applications it is desirable to keep
power dissipation at a minimum. The LTC1289 can be
powered down when not in use reducing the supply
current from a nominal value of 1mA to typically 1
A (with
ACLK turned off). See the Curve for Supply Current (Power
Shutdown) vs ACLK if ACLK cannot be turned off when the
LTC1289 is powered down. In this case the supply current
is proportional to the ACLK frequency and is independent
of temperature until it reaches the magnitude of the supply
current attained with ACLK turned off.
As an example of how to use this feature let’s add this to
the previous application, SNEAK-A-BIT. After the CHK
SIGN subroutine call insert the following:
JSR CHK SIGN
Determines which reading has valid
data, converts to 2’s complement
and stores in RAM
JSR SHUTDOWN
LTC1289 power shutdown routine
The actual subroutine is:
SHUTDOWN: LDA #$3D
Load DIN word for
LTC1289 into ACC
JSR TRANSFER Read LTC1289 routine
RTS
Return
To place the device in power shutdown the word length
bits are set to WL1 = 0 and WL0 = 1. The LTC1289 is
powered up on the next request for conversion and it's
ready to digitize an input signal immediately.
Power Shutdown Timing Considerations
After power shutdown has been requested, the LTC1289
is powered up on the next request for a conversion. This
request can be initiated either by bringing CS low or by
starting the next cycle of SCLKs if CS is kept low (see
Figures 3 and 4). When the SCLK frequency is much
slower than the ACLK frequency a situation can arise
where the LTC1289 could power down and then prema-
turely power back up. Power shutdown begins at the
negative going edge of the 10th SCLK once it has been
requested. A dummy conversion is executed and the
LTC1289 waits for the next request for conversion. If the
SCLKs have not finished once the LTC1289 has finished its
dummy conversion, it will recognize the next remaining
SCLKs as a request to start a conversion and power up the
LTC1289 (see Figure 23). To prevent this, bring either CS
high at the 19th SCLK (Figure 24) or clock out only 10
SCLKs (Figure 25) when power shutdown is requested.
Figure 23. Power Shutdown Timing Problem
Figure 24. Power Shutdown Timing
110
SCLK
CS
POWER SHUTDOWN STARTS
DUMMY CONVERSION FINISHES AFTER 52 ACLK PERIODS
POWER UP
LTC1289 TAF23
110
SCLK
CS
POWER SHUTDOWN STARTS
DUMMY CONVERSION FINISHES AFTER 52 ACLK PERIODS
POWER UP
LTC1289 TAF24
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| LTC1290BCN | 功能描述:IC DATA ACQ SYS 12BIT 20-DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| LTC1290BCN#PBF | 功能描述:IC DATA ACQ SYS 12BIT 20-DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| LTC1290BCSW | 功能描述:IC DATA ACQ SYS 12BIT 20-SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
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