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參數(shù)資料
| 型號(hào)： | LTC2380IMS-16#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 6/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT 2MSPS 16-MSOP |
| 產(chǎn)品培訓(xùn)模塊： | LTC2379- 18-/16-bit Fully-Differential SAR ADC Family Overview |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 2M |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 22mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-TFSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-MSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | * |
| 配用： | DC1783A-A-ND - BOARD SAR ADC LTC2380-16 |
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LTC2380-16
14
238016fa
Figure 11. 32k Point FFT with fIN = 2kHz of the LTC2380-16
FREQUENCY (kHz)
0 100 200 300 400
1000
900
800
700
600
500
–180
AMPLITUDE
(dBFS)
–60
–40
–20
–80
–100
–120
–140
–160
0
238016 F11
SNR = 96.4dB
THD = –119dB
SINAD = 96.3dB
SFDR = 122dB
APPLICATIONS INFORMATION
0μA to a maximum of 1.4mA at 2Msps. This step in DC
current draw triggers a transient response in the reference
that must be considered since any deviation in the refer-
ence output voltage will affect the accuracy of the output
code. In applications where the transient response of the
reference is important, the fast settling LTC6655-5 refer-
ence is also recommended.
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 LTC2380-16 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 11 shows that the LTC2380-16 achieves
a typical SINAD of 96dB at a 2MHz 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
the RMS amplitude of all other frequency components
except the first five harmonics and DC. Figure 11 shows
that the LTC2380-16 achieves a typical SNR of 96.2dB at
a 2MHz sampling rate with a 2kHz input.
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 LTC2380-16 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 LTC2380-16 to communicate with any digital
logic operating between 1.8V and 5V, including 2.5V and
3.3V systems.
Power Supply Sequencing
The LTC2380-16 does not have any specific power supply
sequencing requirements. Care should be taken to adhere
to the maximum voltage relationships described in the
Absolute Maximum Ratings section. The LTC2380-16
has a power-on-reset (POR) circuit that will reset the
LTC2380-16 at initial power-up or whenever the power
supply voltage drops below 1V. Once the supply voltage
re-enters the nominal supply voltage range, the POR will
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