參數(shù)資料
型號(hào)： DC1813A-E
廠商： Linear Technology
文件頁(yè)數(shù)： 5/24頁(yè)
文件大小： 0K
描述： BOARD SAR ADC LTC2369-18
軟件下載： QuikEval II System
設(shè)計(jì)資源： DC1813A Schematic
DC1813A Design File
標(biāo)準(zhǔn)包裝： 1
系列： QuikEval-II™
ADC 的數(shù)量： 1
位數(shù)： 18
采樣率（每秒）： 1.6M
數(shù)據(jù)接口： 串行，SPI?
輸入范圍： 0 ~ VREF
在以下條件下的電源（標(biāo)準(zhǔn)）： 18mW @ 1.6MSPS
工作溫度： 0°C ~ 70°C
已用 IC / 零件： LTC2369-18
已供物品： 板
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LTC2369-18
13
236918fa
APPLICATIONS INFORMATION
code. In applications where the transient response of the
reference is important, the fast settling LTC6655-5 refer-
ence is also recommended.
In applications where power management is critical and
the external reference may be powered down, it is rec-
ommended that REF is kept greater than 2V in order to
guarantee a maximum shutdown current of 140μA. In such
applications, a Schottky diode can be placed between REF
and VDD, as shown in Figure 7.
the RMS amplitude of all other frequency components
except the first five harmonics and DC. Figure 8 shows
that the LTC2369-18 achieves a typical SNR of 96.5dB at
a 1.6MHz sampling rate with a 2kHz input.
FREQUENCY (kHz)
0
100 200 300 400
800
700
600
500
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
236918 F08
SNR = 96.5dB
THD = –127dB
SINAD = 96.5dB
SFDR = 134dB
Figure 8. 32k Point FFT with fIN = 2kHz of the LTC2369-18
Figure 7. A Schottky Diode Between REF and VDD Maintains
REF > 2V for Applications Where the Reference May Be
Powered Down
REF
236918 F07
LTC2369-18
VDD
DYNAMIC PERFORMANCE
Fast Fourier Transform (FFT) 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 algorithm,
the ADC’s spectral content can be examined for frequen-
cies outside the fundamental. The LTC2369-18 provides
guaranteed tested limits for both AC distortion and noise
measurements.
Signal-to-Noise and Distortion Ratio (SINAD)
The signal-to-noise and distortion ratio (SINAD) is the
ratio between the RMS amplitude of the fundamental input
frequency and 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 8 shows that the LTC2369-18 achieves
a typical SINAD of 96.5dB at a 1.6MHz sampling rate with
a 2kHz input.
Signal-to-Noise Ratio (SNR)
The signal-to-noise ratio (SNR) is the ratio between the
RMS amplitude of the fundamental input frequency and
Total Harmonic Distortion (THD)
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 (fSMPL/2).
THD is expressed as:
THD
=20log
V2
2 + V32 + V42 +…+ V
N
2
V1
where V1 is the RMS amplitude of the fundamental fre-
quency and V2 through VN aretheamplitudesofthesecond
through Nth harmonics.
POWER CONSIDERATIONS
The LTC2369-18 provides two power supply pins: the
2.5V power supply (VDD), and the digital input/output
interface power supply (OVDD). The flexible OVDD supply
allows the LTC2369-18 to communicate with any digital
logic operating between 1.8V and 5V, including 2.5V and
3.3V systems.
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