参数资料
型号: LTC2497IUHF#PBF
厂商: Linear Technology
文件页数: 16/28页
文件大小: 0K
描述: IC ADC 16BIT W/PGA 38-QFN
标准包装: 52
位数: 16
采样率(每秒): 7.5
数据接口: I²C,串行
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: 管件
输入数目和类型: 16 个单端,双极;8 个差分,双极
配用: DC1012A-B-ND - BOARD DELTA SIGMA ADC LTC2497
LTC2497
2497fa
INPUT SIGNAL FREQUENCY (Hz)
INPUT
NORMAL
MODE
REJECTION
(dB)
2497 F16
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
fN
0
2fN 3fN 4fN 5fN 6fN 7fN 8fN
fN = fEOSC/5120
INPUT SIGNAL FREQUENCY (Hz)
250fN 252fN 254fN 256fN 258fN 260fN 262fN
INPUT
NORMAL
MODE
REJECTION
(dB)
2497 F17
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
fN = fEOSC/5120
Figure 17. Input Normal Mode Rejection at fS = 256 fN
Figure 16. Input Normal Mode Rejection at DC
The SINC4 digital filter provides excellent normal mode
rejection at all frequencies except DC and integer multiples
of the modulator sampling frequency (fS). The modulator
sampling frequency is fS = 15,360Hz while operating with
itsinternaloscillatorandfS=fEOSC/20whenoperatingwith
an external oscillator of frequency fEOSC.
Whenusingtheinternaloscillator,theLTC2497isdesigned
to reject line frequencies. As shown in Figure 16, rejection
nulls occur at multiples of frequency fN, where fN = 55Hz
for simultaneous 50Hz/60Hz rejection. Multiples of the
modulator sampling rate (fS = fN 256) only reject noise
to 15dB (see Figure 17); if noise sources are present at
these frequencies antialiasing will reduce their effects.
Theusercanexpecttoachievethislevelofperformance us-
ing the internal oscillator, as shown in Figure 18. Measured
values of normal mode rejection are shown superimposed
over the theoretical values.
Traditional high order delta-sigma modulators suffer from
potential instabilities at large input signal levels. The
proprietary architecture used for the LTC2497 third order
modulator resolves this problem and guarantees stability
with input signals 150% of full scale. In many industrial
applications, it is not uncommon to have microvolt level
signals superimposed over unwanted error sources with
several volts if peak-to-peak noise. Figure 19 shows mea-
surement results for the rejection of a 7.5V peak-to-peak
noise source (150% of full scale) applied to the LTC2497.
This curve shows that the rejection performance is main-
tained even in extremely noisy environments.
Output Data Rate
When using its internal oscillator, the LTC2497 produces
up to 7.5 samples per second (sps) with a notch frequency
of60Hz.Theactualoutputdataratedependsuponthelength
of the sleep and data output cycles which are controlled
applicaTions inForMaTion
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