参数资料
型号: LTC1603CG#PBF
厂商: Linear Technology
文件页数: 9/20页
文件大小: 0K
描述: IC ADC SMPL SHTDWN 16BIT 36-SSOP
标准包装: 37
位数: 16
采样率(每秒): 250k
数据接口: 并联
转换器数目: 1
功率耗散(最大): 350mW
电压电源: 模拟和数字,双 ±
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 36-SSOP(0.209",5.30mm 宽)
供应商设备封装: 36-SSOP
包装: 管件
输入数目和类型: 2 个单端,双极;1 个差分,双极
产品目录页面: 1346 (CN2011-ZH PDF)
1603f
17
LTC1603
APPLICATIONS INFORMATION
WU
U
Signal-to-Noise Ratio
The signal-to-noise plus distortion ratio [S/(N + D)] is the
ratio between the RMS amplitude of the fundamental input
frequency to the RMS amplitude of all other frequency
components at the A/D output. The output is band limited
to frequencies from above DC and below half the sampling
frequency. Figure 18a shows a typical spectral content
with a 250kHz sampling rate and a 5kHz input. The
dynamic performance is excellent for input frequencies up
to and beyond the Nyquist limit of 125kHz.
Effective Number of Bits
The effective number of bits (ENOBs) is a measurement of
the resolution of an ADC and is directly related to the
S/(N + D) by the equation:
N = [S/(N + D) – 1.76]/6.02
where N is the effective number of bits of resolution and
S/(N + D) is expressed in dB. At the maximum sampling
rate of 250kHz the LTC1603 maintains above 14 bits up to
the Nyquist input frequency of 125kHz (refer to Figure 19).
Total Harmonic Distortion
Total harmonic distortion (THD) is the ratio of the RMS
sum of all harmonics of the input signal to the fundamental
itself. The out-of-band harmonics alias into the frequency
band between DC and half the sampling frequency. THD is
expressed as:
THD
Log
VVV
Vn
V
=
++
+
20
23
4
1
22
2
...
where V1 is the RMS amplitude of the fundamental fre-
quency and V2 through Vn are the amplitudes of the
second through nth harmonics. THD vs Input Frequency is
shown in Figure 20. The LTC1603 has good distortion
performance up to the Nyquist frequency and beyond.
Figure 18b. Even with Inputs at 100kHz, the LTC1603’s
Dymanic Linearity Remains Robust
Figure 20. Distortion vs Input Frequency
Figure 19. Effective Bits and Signal/(Noise + Distortion)
vs Input Frequency
FREQUENCY (kHz)
AMPLITUDE
(dB)
–60
–40
–20
1603 F18b
–80
–100
–120
–140
0
060
20
40
80
100
120
fSAMPLE = 250kHz
fIN = 97.152kHz
SINAD = 89dB
THD = –96dB
FREQUENCY (Hz)
1k
EFFECTIVE
BITS
SINAD
(dB)
16
15
14
13
12
11
10
9
8
98
92
86
80
74
68
62
56
50
10k
100k
1M
1603 F19
INPUT FREQUENCY (Hz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
AMPLITUDE
(dB
BELOW
THE
FUNDAMENTAL)
1603 F20
1k
10k
100k
1M
THD
3RD
2ND
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