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參數(shù)資料
| 型號： | LTC1598LCG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | Replaced by ADS7961 : 8-Bit, 76 kSPS ADC Serial Out, On-Chip 20 Ch. Analog Mux, 19 Ch. 28-PLCC |
| 中文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO24 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 18/24頁 |
| 文件大?。?/td> | 278K |
| 代理商： | LTC1598LCG |
18
LTC1594L/LTC1598L
Conversion Speed with Reduced V
REF
With reduced reference voltages, the LSB step size is
reduced and the LTC1594L/LTC1598L internal compara-
tor overdrive is reduced. Therefore, it may be necessary
to reduce the maximum CLK frequency when low values
of V
REF
are used.
DYNAMIC PERFORMANCE
The LTC1594L/LTC1598L have exceptional sampling
capability. Fast Fourier Transform (FFT) test techniques
are used to characterize the ADC’s frequency response,
distortion and noise at the rated throughput. By applying
a low distortion sine wave and analyzing the digital
output using an FFT algorithm, the ADC’s spectral con-
tent can be examined for frequencies outside the funda-
mental. Figure 10 shows a typical LTC1594L/LTC1598L
plot.
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Effective Number of Bits
The Effective Number of Bits (ENOBs) is a measurement of
the resolution of an ADC and is directly related to S/(N + D)
by the equation:
ENOB = [S/(N + D) – 1.76]/6.02
where S/(N + D) is expressed in dB. At the maximum
sampling rate of 10.5kHz with a 5V supply, the LTC1594L/
LTC1598L maintain above 10.7 ENOBs at 10kHz input
frequency. Above 10kHz the ENOBs gradually decline, as
shown in Figure 11, due to increasing second harmonic
distortion. The noise floor remains low.
Total Harmonic Distortion
Total Harmonic Distortion (THD) is the ratio of the RMS
sum of all harmonics of the input signal to the fundamen-
tal itself. The out-of-band harmonics alias into the fre-
quency band between DC and half of the sampling
frequency. THD is defined as:
THD
=
+
+
+
+
20log
V
V
V
V
V
2
2
3
2
4
2
N
2
1
...
where V
1
is the RMS amplitude of the fundamental
frequency and V
2
through V
N
are the amplitudes of the
second through the N
th
harmonics. The typical THD
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 fre-
quency components at the ADC’s output. The output is
band limited to frequencies above DC and below one half
the sampling frequency. Figure 11 shows a typical spec-
tral content with a 10.5kHz sampling rate.
Figure 10. LTC1594L/LTC1598L Nonaveraged,
4096 Point FFT Plot
FREQUENCY (kHz)
0
–120
M
–100
–80
–60
–40
1.0
2.0
3.0
4.0
1594L/98L G13
–20
0
0.5
1.5
2.5
3.5
T
A
= 25
°
C
V
CC
= 2.7V
V
REF
= 2.5V
f
IN
= 3.05kHz
f
CLK
= 120kHz
f
SMPL
= 7.5kHz
Figure 11. Effective Bits and S/(N + D) vs Input Frequency
INPUT FREQUENCY (kHz)
1
0
E
S
3
2
5
4
7
6
10
10
100
1594L/98L G09
1
9
8
12
11
62
56
50
74
68
T
A
= 25
°
C
V
CC
= 2.7V
f
CLK
= 200kHz
f
SMPL
= 10.5kHz
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