参数资料
型号: LTC2418IGN#TRPBF
厂商: Linear Technology
文件页数: 29/48页
文件大小: 0K
描述: IC ADC 24BIT DIFF INPUT 28SSOP
标准包装: 2,500
位数: 24
采样率(每秒): 7.5
数据接口: MICROWIRE?,串行,SPI?
转换器数目: 1
功率耗散(最大): 1mW
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: 28-SSOP(0.154",3.90mm 宽)
供应商设备封装: 28-SSOP
包装: 带卷 (TR)
输入数目和类型: 16 个单端,单极;16 个单端,双极;8 个差分,单极;8 个差分,双极
配用: DC571A-ND - BOARD DELTA SIGMA ADC LTC2418
LTC2414/LTC2418
35
241418fa
Traditional high order delta-sigma modulators, while
providing very good linearity and resolution, suffer from
potential instabilities at large input signal levels. The pro-
prietary architecture used for the LTC2414/LTC2418 third
order modulator resolves this problem and guarantees a
predictable stable behavior at input signal levels of up to
150% of full scale. In many industrial applications, it is not
uncommon to have to measure microvolt level signals
superimposed over volt level perturbations and LTC2414/
LTC2418 is eminently suited for such tasks. When the
perturbation is differential, the specification of interest is
the normal mode rejection for large input signal levels.
With a reference voltage VREF = 5V, the LTC2414/LTC2418
has a full-scale differential input range of 5V peak-to-peak.
Figures 39 and 40 show measurement results for the
LTC2414/LTC2418 normal mode rejection ratio with a 7.5V
peak-to-peak (150% of full scale) input signal superim-
posed over the more traditional normal mode rejection
ratio results obtained with a 5V peak-to-peak (full scale)
input signal. In Figure 39, the LTC2414/LTC2418 uses the
internal oscillator with the notch set at 60Hz (FO = LOW)
and in Figure 40 it uses the internal oscillator with the
notch set at 50Hz (FO = HIGH). It is clear that the LTC2414/
LTC2418 rejection performance is maintained with no com-
promises in this extreme situation. When operating with
large input signal levels, the user must observe that such
signals do not violate the device absolute maximum
ratings.
Figure 39. Measured Input Normal Mode Rejection vs Input Frequency with Input Perturbation of 150% Full Scale (60Hz Notch)
Figure 40. Measured Input Normal Mode Rejection vs Input Frequency with Input Perturbation of 150% Full Scale (50Hz Notch)
INPUT FREQUENCY (Hz)
0
15
30
45
60
75
90
105 120 135 150 165 180 195 210 225 240
NORMAL
MODE
REJECTION
(dB)
2414/18 F39
0
–20
–40
–60
–80
–100
–120
VCC = 5V
REF+ = 5V
REF = GND
VINCM = 2.5V
SDI = GND
FO = GND
TA = 25°C
VIN(P-P) = 5V
VIN(P-P) = 7.5V
(150% OF FULL SCALE)
INPUT FREQUENCY (Hz)
0
NORMAL
MODE
REJECTION
(dB)
2414/18 F40
0
–20
–40
–60
–80
–100
–120
VCC = 5V
REF+ = 5V
REF = GND
VINCM = 2.5V
SDI = GND
FO = 5V
TA = 25°C
VIN(P-P) = 5V
VIN(P-P) = 7.5V
(150% OF FULL SCALE)
12.5
25
37.5
50
62.5
75
87.5 100 112.5 125 137.5 150 162.5 175 187.5 200
APPLICATIO S I FOR ATIO
WU
UU
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