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參數(shù)資料
| 型號： | AS1542-BTST |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | ADC |
| 英文描述： | 12-bit 16-CH 1Msps w Sequencer; Package Type: TSSOP-28 |
| 封裝： | TSSOP-28 |
| 文件頁數(shù)： | 23/29頁 |
| 文件大?。?/td> | 964K |
| 代理商： | AS1542-BTST |
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Revision 1.00
23 - 29
AS1542
Data Sheet - Detailed Description
Auto Shutdown (PM1 = 0, PM0 = X)
In this mode, the AS1542 automatically enters shutdown after the 14th SLK falling edge of each conversion is updated.
When the device is in shutdown mode, the track/hold circuitry is in hold mode.
Note:
The control register maintains its data while in shutdown mode.
Figure 34
shows the operation of the AS1542 when it is in automatic shutdown mode The AS1542 remains in shut-
down until the next CSN falling edge it receives. On this CSN falling edge, the track and hold that was in hold while the
device was in shutdown will return to track.
Note:
Wake-up time from auto shutdown is 1μs.
Figure 34. Auto Shutdown Mode Operation
Notes:
1. Control register data is loaded on the 1st 13 SCLK cycles.
2. Set control register bits PM1 = 1 and PM0 = 1 to keep the device in normal mode.
When running the AS1542 with a 20MHz clock, one dummy cycle of 1μs
(see Figure 34)
(16 SCLKs plus Track&Hold
aquisation time) should be sufficient to ensure the part is fully powered up.
This dummy cycle effectively halves the throughput rate, with every other conversion result being valid. In this mode,
the power consumption of the part is greatly reduced with the part entering shutdown at the end of each conversion.
Note:
The end of shutdown can be controlled by the CSN signal.
Power vs. Throughput Rate
By operating the AS1542 in auto shutdown
(see page 23)
the average power consumption of the ADC decreases at
lower throughput rates. The Power vs. Throughput Rate graph
in the Typical Operating Characteristics section shows
how as the throughput rate is reduced, the part remains in its shutdown state longer and the average power consump-
tion over time drops accordingly.
If the AS1542 is operated in a continuous sampling mode with a throughput rate of 100ksps and a SCLK of 20 MHz
(V
DD
= 5V), with bit
PM1 (page 14)
= 0, i.e., the device is in auto shutdown mode
(see page 23)
, then the power con-
sumption is calculated as follows:
The maximum power dissipation during normal operation is 18.4mW (V
DD
= 5.25V). If the power-up time from auto
shutdown is one dummy cycle (i.e., 1μs) and the remaining conversion time is another cycle (i.e., 1μs) then the
AS1542 will dissipate approximately 18.4mW for 2μs during each conversion cycle. For the remainder of the conver-
sion cycle (8μs), the device remains in shutdown mode. The AS1542 will dissipate approximately 2.5μW for the
remaining 8μs of the conversion cycle. If the throughput rate is 100ksps, the cycle time is 10μs and the average power
dissipated during each cycle is:
((2/10) x 18.4mW) + ((8/10) x 2.5μW) = 3.682mW
(EQ 1)
1
14 16
DOUT
Data into Control/Shadow Register
Data into Control/Shadow Register
Data into Control/Shadow Register
1
14 16
1
14 16
SCLK
DIN
Channel ID Bits + Conversion Results
Invalid Data
Channel ID Bits + Conversion Results
CSN
Device enters automatic
shutdown on 14th SCLK
falling edge as PM1 = 0
Device begins to power
up on falling CSN edge
and remains powered-up
on PM1=1 and PM0=1
Device is fully
powered up
Device enters shutdown
on the 14th SCLK falling
edge as PM1 = 0
Dummy Conversion
Valid Conversion
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相關代理商/技術參數(shù) |
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| AS1542-BTSU | 功能描述:模數(shù)轉換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| AS1543 | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:8/4-Channel, 1 Msps, 12-Bit ADC with Sequencer |
| AS1543BQFT | 制造商:AMS 功能描述:IC ADC 12BIT 1MSPS TQFN-20 制造商:AMS 功能描述:IC, ADC, 12BIT, 1MSPS, TQFN-20; Resolution (Bits):12bit; Sampling Rate:1MSPS; Supply Voltage Type:Single; Supply Voltage Min:2.75V; Supply Voltage Max:5.25V; Supply Current:3mA; Digital IC Case Style:TQFN; No. of Pins:20; DNL:1.2LSB;RoHS Compliant: Yes |
| AS1543-BQFT | 功能描述:IC ADC 12BIT 8CH 1M 20-TQFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:250 系列:- 位數(shù):12 采樣率（每秒）:1.8M 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:1 功率耗散（最大）:1.82W 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-LQFP 供應商設備封裝:48-LQFP（7x7） 包裝:管件 輸入數(shù)目和類型:2 個單端，單極 |
| AS1543-BTST | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:8/4-Channel, 1 Msps, 12-Bit ADC with Sequencer |
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