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參數(shù)資料
| 型號： | ADCS7476AIMF |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | 1MSPS, 12-/10-/8-Bit A/D Converters in 6-Lead SOT-23 |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁數(shù)： | 20/22頁 |
| 文件大?。?/td> | 514K |
| 代理商： | ADCS7476AIMF |
Applications Information
(Continued)
10.0 EXITING SHUTDOWN MODE
To exit shutdown mode, bring CS back low. Upon bringing
CS low, the ADCS7476/77/78 will begin powering up. Power
up typically takes 1 μs. This microsecond of power-up delay
results in the first conversion result being unusable. The
second conversion performed after power-up, however, is
valid, as shown in Figure 11.
If CS is brought back high before the 10th falling edge of
SCLK, the device will return to shutdown mode. This is done
to avoid accidentally entering normal mode as a result of
noise on the CS line. To exit shutdown mode and remain in
normal mode, CS must be kept low until after the 10th falling
edge
of
SCLK.
The
ADCS7476/77/78
powered-up after 16 SCLK cycles.
will
be
fully
11.0 POWER-UP TIMING
The ADCS7476/77/78 typically requires 1 μs to power up,
either after first applying V
, or after returning to normal
mode from shutdown mode. This corresponds to one
"dummy" conversion for any SCLK frequency within the
specifications in this document. After this first dummy con-
version, theADCS7476/77/78 will perform conversions prop-
erly. Note that the t
QUIET
time must still be included between
the first dummy conversion and the second valid conversion.
12.0 STARTUP MODE
When the V
DD
supply is first applied, the ADCS7476/77/78
may power up in either of the two modes: normal or shut-
down.As such, one dummy conversion should be performed
after start-up, exactly as described in Section 11.0. The part
may then be placed into either normal mode or the shutdown
mode, as described in Sections 8.0 and 9.0.
13.0 POWER MANAGEMENT
When the ADCS7476/77/78 is operated continuously in nor-
mal mode, throughput up to 1 MSPS can be achieved. The
user may trade throughput for power consumption by simply
performing fewer conversions per unit time, and putting the
ADCS7476/77/78 into shutdown mode between conver-
sions. This method is not advantageous beyond 350 kSPS
throughput.
A plot of maximum power consumption versus throughput is
shown in Figure 12 below. To calculate the power consump-
tion for a given throughput, remember that each time the part
exits shutdown mode and enters normal mode, one dummy
conversion is required. Generally, the user will put the part
into normal mode, execute one dummy conversion followed
by one valid conversion, and then put the part back into
shutdown mode. When this is done, the fraction of time
spent in normal mode may be calculated by multiplying the
throughput (in samples per second) by 2 μs, the time taken
to perform one dummy and one valid conversion. The power
consumption can then be found by multiplying the fraction of
time spent in normal mode by the normal mode power
consumption figure. The power dissipated while the part is in
shutdown mode is negligible.
For example, to calculate the power consumption at 300
kSPS with V
DD
= 5V, begin by calculating the fraction of time
spent in normal mode: 300,000 samples/second · 2 μs = 0.6,
or 60%. The power consumption at 300 kSPS is then 60% of
17.5 mW (the maximum power consumption at V
DD
= 5V) or
10.5 mW.
20057716
FIGURE 10. Entering Shutdown Mode
20057717
FIGURE 11. Entering Normal Mode
A
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADCS7476AIMF | 制造商:Texas Instruments 功能描述:12BIT ADC 1MSPS SMD 7476 SOT236 |
| ADCS7476AIMF/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 1MSPS,12-/10-/8B ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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 |
| ADCS7476AIMFE | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1MSPS, 12-/10-/8-Bit A/D Converters in SOT-23 & LLP |
| ADCS7476AIMFE/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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 |
| ADCS7476AIMFNOPB | 制造商:Texas Instruments 功能描述:Analog Digital Converter, Single, 12 Bit, 6 Pin, TSOP |
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