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| 型号： | LTC6803IG-3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 37/40页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR BATT STACK 44-SSOP |
| 标准包装： | 2,000 |
| 功能： | 电池监控器，过压/欠压保护 |
| 电池化学： | 多化学成分，超级电容器 |
| 电源电压： | 4 V ~ 55 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-FSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 44-SSOP |
| 包装： | 带卷 (TR) |
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LTC6803-1/LTC6803-3
APPLICATIONS INFORMATION
required for each channel. A low frequency filter cannot
reside between a multiplexer and an ADC and achieve a
high scan rate across multiple channels. Another conse-
quence of filtering a SAR ADC is that any noise reduction
gained by filtering the input cancels the benefit of having
a high sample rate in the first place, since the filter will
take many conversion cycles to settle.
For a given sample rate, a delta-sigma converter can
achieve excellent noise rejection while settling completely
in a single conversion—something that a filtered SAR con-
verter cannot do. Noise rejection is particularly important
in high voltage switching controllers, where switching
noise will invariably be present in the measured voltage.
Other advantages of delta-sigma converters are that they
are inherently monotonic, meaning they have no missing
codes, and they have excellent DC specifications.
Converter Details
The LTC6803’s ADC has a second order delta-sigma
modulator followed by a SINC2, finite impulse response
(FIR) digital filter. The front-end sample rate is 512ksps,
which greatly reduces input filtering requirements. A
simple 16kHz, 1-pole filter composed of a 100Ω resistor
and a 0.1μF capacitor at each input will provide adequate
filtering for most applications. These component values
will not degrade the DC accuracy of the ADC.
Each conversion consists of two phases—an autozero
phase and a measurement phase. The ADC is autozeroed
at each conversion, greatly improving CMRR. The second
half of the conversion is the actual measurement.
Noise Rejection
Figure 28 shows the frequency response of the ADC. The
roll-off follows a SINC2 response, with the first notch at
4kHz. Also shown is the response of a 1-pole, 850Hz filter
(187μs time constant) which has the same integrated
response to wideband noise as the LTC6803’s ADC, which
10
0
–10
–20
–30
–40
–50
–60
10 100 1k 10k 100k
FREQUENCY (Hz)
680313 F28
Figure 28. Noise Filtering of the LTC6803 ADC
is about 1350Hz. This means that if wideband noise is
applied to the LTC6803 input, the increase in noise seen
at the digital output will be the same as an ADC with a
wide bandwidth (such as a SAR) preceded by a perfect
1350Hz brick wall lowpass filter.
Thus if an analog filter is placed in front of a SAR converter
to achieve the same noise rejection as the LTC6803 ADC,
the SAR will have a slower response to input signals. For
example, a step input applied to the input of the 850Hz
filter will take 1.55ms to settle to 12 bits of precision, while
the LTC6803 ADC settles in a single 1ms conversion cycle.
This also means that very high sample rates do not provide
any additional information because the analog filter limits
the frequency response.
While higher order active filters may provide some im-
provement, their complexity makes them impractical for
high channel count measurements as a single filter would
be required for each input.
Also note that the SINC2 response has a 2nd order roll-
off envelope, providing an additional benefit over a single
pole analog filter.
680313fa
37
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6803IG-4#PBF | 功能描述:IC MONITOR BATT STACK MC 44-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTC6803IG-4#TRPBF | 功能描述:IC MONITOR BATT STACK 44-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC6803IG-4PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Multicell Battery Stack Monitor |
| LTC6804-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effciency Bidirectional Multicell Battery Balancer |
| LTC6804-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effciency Bidirectional Multicell Battery Balancer |
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