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参数资料
| 型号： | DC1339A |
| 厂商： | Linear Technology |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | BOARD SAR ADC LTC2302 |
| 软件下载： | QuikEval System |
| 设计资源： | DC1339A Design File DC1339A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 500k |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 输入范围： | ±VREF/2 |
| 在以下条件下的电源（标准）： | 14mW @ 500kSPS |
| 已用 IC / 零件： | LTC2302 |
| 已供物品： | 板 |
| 相关产品： | LTC2302IDD#TRPBF-ND - IC ADC 12-BIT 1CH 500KSPS 10DFN LTC2302IDD#PBF-ND - IC ADC 12BIT 1CH 500KSPS 10-DFN LTC2302CDD#TRPBF-ND - IC ADC 12-BIT 1CH 500KSPS 10DFN LTC2302CDD#PBF-ND - IC ADC 12BIT 1CH 500KSPS 10-DFN |
LTC2302/LTC2306
15
23026fa
APPLICATIONS INFORMATION
Figure 3a. Optional RC Input Filtering for Single-Ended Input
Figure 3b. Optional RC Input Filtering for Differential Inputs
Figure 4. 1kHz Sine Wave 8192 Point FFT Plot (LTC2306)
Figures 3a and 3b show respective examples of input
ltering for single-ended and differential inputs. For the
single-ended case in Figure 3a, a 50Ω source resistor
and a 2000pF capacitor to ground on the input will limit
the input bandwidth to 1.6MHz. High quality capacitors
and resistors should be used in the RC lter since these
components can add distortion. NPO and silver mica type
dielectric capacitors have excellent linearity. Carbon surface
mount resistors can 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.
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 algorithm, the
ADC’s spectral content can be examined for frequencies
outside the fundamental.
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 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 4 shows a typical SINAD of 72.8dB with
a 500kHz sampling rate and a 1kHz input. A SNR of 73.2dB
can be achieved with the LTC2302/LTC2306.
23026 F03a
CH0, CH1
LTC2306
VREF
2000pF
10μF
0.1μF
50Ω
ANALOG
INPUT
LT1790A-4.096
VOUT
VIN
5V
1000pF
23026 F03b
CH0, IN+
CH1, IN–
LTC2302
LTC2306
VREF
1000pF
10μF
0.1μF
50Ω
DIFFERENTIAL
ANALOG
INPUTS
0.1μF
LT1790A-4.096
VOUT
VIN
5V
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
VVV
V
N
=
++
+
20
2
3
2
4
22
1
log
...
where V1 is the RMS amplitude of the fundamental fre-
quency and V2 through VN are the amplitudes of the second
through Nth harmonics.
FREQUENCY (kHz)
0
–40
–20
0
200
23026 F04
–60
–80
50
100
150
250
–100
–120
–50
–30
–10
–70
–90
–110
–130
–140
MAGNITUDE
(dB)
SNR = 73.2dB
SINAD = 72.8dB
THD = –88.7dB
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