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参数资料
| 型号： | LTC2482CDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/32页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT 10-DFN |
| 标准包装： | 2,500 |
| 位数： | 16 |
| 采样率（每秒）： | 6.8 |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 480µW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，双极 |
| 配用： | DC941A-ND - BOARD DELTA SIGMA ADC LTC2482 |
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LTC2482
13
2482fc
APPLICATIONS INFORMATION
Conversion Clock
A major advantage the delta-sigma converter offers over
conventional type converters is an on-chip digital lter
(commonly implemented as a SINC or Comb lter). For
high resolution, low frequency applications, this lter is
typically designed to reject line frequencies of 50Hz or 60Hz
plus their harmonics. The lter rejection performance is
directly related to the accuracy of the converter system
clock. The LTC2482 incorporates a highly accurate on-chip
oscillator. This eliminates the need for external frequency
setting components such as crystals or oscillators.
Frequency Rejection Selection (fO)
The LTC2482 internal oscillator provides better than
87dB normal mode rejection at the line frequency and all
its harmonics (up to the 255th) for the frequency range
48Hz to 62.4Hz.
Whenafundamentalrejectionfrequencydifferentfrom50Hz/
60Hz is required, when more than 87dB rejection is needed
for 50Hz/60Hz, or when the converter must be synchronized
with an outside source, the LTC2482 can operate with an
external conversion clock. The converter automatically
detects the presence of an external clock signal at the fO pin
and turns off the internal oscillator. The frequency fEOSC of
the external signal must be at least 10kHz to be detected. The
external clock signal duty cycle is not signicant as long as
the minimum and maximum specications for the high and
low periods tHEO and tLEO are observed.
While operating with an external conversion clock of a
frequency fEOSC, the LTC2482 provides better than 110dB
normal mode rejection in a frequency range of fEOSC/5120
±4% and its harmonics. The normal mode rejection as a
DIFFERENTIAL INPUT SIGNAL FREQUENCY
DEVIATION FROM NOTCH FREQUENCY fEOSC/5120(%)
–12
–8
–4
0
4
8
12
NORMAL
MODE
REJECTION
(dB)
2480 F03
–80
–85
–90
–95
–100
–105
–110
–115
–120
–125
–130
–135
–140
Figure 3. LTC2482 Normal Mode Rejection When Using
an External Oscillator
function of the input frequency deviation from fEOSC/5120
is shown in Figure 3.
Whenever an external clock is not present at the fO pin, the
converter automatically activates its internal oscillator and
enters the internal conversion clock mode. The LTC2482
operation will not be disturbed if the change of conversion
clock source occurs during the sleep state or during the
data output state while the converter uses an external serial
clock. If the change occurs during the conversion state,
the result of the conversion in progress may be outside
specications but the following conversions will not be
affected. If the change occurs during the data output state
and the converter is in the Internal SCK mode, the serial
clock duty cycle may be affected but the serial data stream
will remain valid.
Table 3 summarizes the duration of each state and the
achievable output data rate as a function of fO.
Table 3. LTC2482 State Duration
STATE
OPERATING MODE
DURATION
CONVERT
Internal Oscillator
50Hz/60Hz Rejection
147ms, Output Data Rate ≤ 6.8 Readings/s
External Oscillator
fO = External Oscillator
with Frequency fEOSC kHz
(fEOSC/5120 Rejection)
41036/fEOSCs, Output Data Rate ≤ fEOSC/41036 Readings/s
SLEEP
As Long As CS = High, After a Conversion is Complete
DATA OUTPUT Internal Serial Clock
fO = Low/High
(Internal Oscillator)
As Long As CS = Low But Not Longer Than 0.62ms (24 SCK Cycles)
fO = External Oscillator with
Frequency fEOSC kHz
As Long As CS = Low But Not Longer Than 192/fEOSCms (24 SCK Cycles)
External Serial Clock with Frequency fSCK kHz
As Long As CS = Low But Not Longer Than 24/fSCKms (24 SCK Cycles)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC2482IDD | 制造商:Linear Technology 功能描述:ADC Single Delta-Sigma 6.8sps 16-bit Serial 10-Pin DFN EP |
| LTC2482IDD#PBF | 功能描述:IC ADC 16BIT 10-DFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| LTC2482IDD#PBF | 制造商:Linear Technology 功能描述:IC, ADC, 16BIT, DFN-10 |
| LTC2482IDD#TR | 制造商:Linear Technology 功能描述:ADC Single Delta-Sigma 6.8sps 16-bit Serial 10-Pin DFN EP T/R |
| LTC2482IDD#TRPBF | 功能描述:IC ADC 16BIT 10-DFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 电压电源:单电源 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:38-WFQFN 裸露焊盘 供应商设备封装:38-QFN（5x7） 包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
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