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參數(shù)資料
| 型號： | LTC1863LIGN#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT 8CH 175KSPS 16SSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 175k |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 2.7mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 8 個單端，單極；8 個單端，雙極；4 個差分，單極；4 個差分，雙極 |
LTC1863L/LTC1867L
11
1863l7lfc
many applications. For instance, Figure 1 shows a 50Ω
source resistor and a 2000pF capacitor to ground on the
input will limit the input bandwidth to 1.6MHz. The source
impedance has to be kept low to avoid gain error and
degradation in the AC performance. The capacitor also
acts as a charge reservoir for the input sample-and-hold
and isolates the ADC input from sampling glitch sensitive
circuitry. High quality capacitors and resistors should be
used since these components can add distortion. NPO
and silver mica type dielectric capacitors have excellent
linearity. Carbon surface mount resistors can also generate
distortion from self heating and from damage that may
occur during soldering. Metal lm surface mount resistors
are much less susceptible to both problems.
DC Performance
One way of measuring the transition noise associated
with a high resolution ADC is to use a technique where
a DC signal is applied to the input of the ADC and the
resulting output codes are collected over a large number
of conversions. For example, in Figure 2 the distribution
of output codes is shown for a DC input that had been
digitized 4096 times. The distribution is Gaussian and the
RMS code transition noise is about 1.6LSB.
APPLICATIONS INFORMATION
Dynamic Performance
FFT (Fast Fourier Transform) test techniques are used to
test 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
Figure 2. LTC1867L Histogram for 4096 Conversions
Figure 3a. LTC1867L Nonaveraged 4096 Point
FFT Plot with 2.7V Supply
Figure 3b. LTC1867L Nonaveraged 4096 Point
FFT Plot with 3V Supply
CODE
20
7
0
COUNTS
200
400
600
800
1200
22
24
26
28
1863L7L G12
30
21
23
25
27
29
31
1000
58
465
1044
895
830
261
23 9 1
170
333
VDD = 2.7V
INTERNAL REF
algorithm, the ADC’s spectral content can be examined
for frequencies outside the fundamental.
Signal-to-Noise Ratio
The Signal-to-Noise and Distortion Ratio (SINAD) 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 3a shows a typical SINAD of 81.4dB
with a 175kHz sampling rate and a 1kHz input. Higher
SINAD can be obtained with a 3V supply. For example,
when an external 3V is applied to REFCOMP (tie VREF to
GND), a SINAD of 83.5dB can be achieved as shown in
Figure 3b.
FREQUENCY (kHz)
0
–60
–40
0
65.625
1863L7L G03
–80
–100
21.875
43.75
87.5
–120
–140
–20
AMPLITUDE
(dB)
fSAMPLE = 175ksps
fIN = 1kHz
SNR = 82.9dB
SINAD = 81.4dB
THD = 86.8dB
FREQUENCY (kHz)
0
–60
–40
0
65.625
1863L7L F03b
–80
–100
21.875
43.75
87.5
–120
–140
–20
AMPLITUDE
(dB)
fSAMPLE = 175ksps
fIN = 1kHz
SNR = 84.7dB
SINAD = 83.5dB
THD = 90dB
REFCOMP = EXT 3V
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