參數(shù)資料
型號(hào)： LTC1608ACG
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： ADC
英文描述： High Speed, 16-Bit, 500ksps Sampling A/D Converter with Shutdown
中文描述： 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO36
封裝： 5.30 MM, PLASTIC, SSOP-36
文件頁(yè)數(shù)： 18/20頁(yè)
文件大?。?/td> 1000K
代理商： LTC1608ACG
18
LTC1608
APPLICATIOU
W
U
U
The
dynamic performance is excellent for input frequen-
cies up to and beyond the Nyquist limit of 250kHz.
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:
ENOB = [S/(N + D) – 1.76]/6.02
where ENOB is the effective number of bits of resolution
and S/(N + D) is expressed in dB. At the maximum
sampling rate of 500kHz, the LTC1608 maintains above 14
bits up to the Nyquist input frequency of 250kHz (refer to
Figure 20).
FREQUENCY (kHz)
0
–40
–20
0
200
1608 F19b
–60
–80
50
100
150
250
–100
–120
–140
A
f
SAMPLE
= 500kHz
f
SINAD = 86.7dB
THD = –92.6dB
Figure 19b. Even with Inputs at 100kHz, the
LTC1608’s Dynamic Linearity Remains Robust
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
V
V
V
Vn
V
=
+
+
+
20
2
3
4
1
2
2
2
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 21. The LTC1608 has good distortion
performance up to the Nyquist frequency and beyond.
Intermodulation Distortion
If the ADC input signal consists of more than one spectral
component, the ADC transfer function nonlinearity can
produce intermodulation distortion (IMD) in addition to
THD. IMD is the change in one sinusoidal input caused by
the presence of another sinusoidal input at a different
frequency.
If two pure sine waves of frequencies fa and fb are applied
to the ADC input, nonlinearities in the ADC transfer
function can create distortion products at the sum and
difference frequencies of mfa
±
nfb, where m and n = 0,
1, 2, 3, etc. For example, the 2nd order IMD terms include
FREQUENCY (kHz)
0
–40
–20
0
200
1608 F19a
–60
–80
50
100
150
250
–100
–120
–140
A
f
SAMPLE
= 500kHz
f
SINAD = 88.9dB
THD = –98dB
Figure 19a. This FFT of the LTC1608’s Conversion of a
Full-Scale 3kHz Sine Wave Shows Outstanding Response
with a Very Low Noise Floor When Sampling at 500ksps
FREQUENCY (Hz)
1k
E
S
16
15
14
13
12
11
10
9
8
98
92
86
80
74
68
62
56
50
10k
100k
1M
1608 F20
Figure 20. Effective Bits and Signal/(Noise + Distortion)
vs Input Frequency
相關(guān)PDF資料
PDF描述
LTC1608CG 8-Bit, 45.5 kSPS ADC Serial Out, Low Power, Compatible to TLC540/545/1540, Single Ch. 8-SOIC
LTC1645 Dual-Channel Hot Swap Controller/Power Sequencer
LTC1645C 8-Bit, 40 MSPS ADC Single Ch., Internal S&H, Low Power 24-TSSOP -40 to 85
LTC1645CS Low Power Timer 8-SOIC 0 to 70
LTC1645CS8 Low Power Timer 8-SOIC 0 to 70
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