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| 型号： | DC1444A-B |
| 厂商： | Linear Technology |
| 文件页数： | 7/26页 |
| 文件大小： | 0K |
| 描述： | BOARD SAR ADC LTC2305 |
| 软件下载： | QuikEval System |
| 设计资源： | DC1444A Design File DC1444A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 2 |
| 位数： | 12 |
| 采样率（每秒）： | 14k |
| 数据接口： | I²C，串行 |
| 在以下条件下的电源（标准）： | 1.5mW @ 1kSPS |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2305 |
| 已供物品： | 板 |
| 相关产品： | LTC2305IMS#TRPBF-ND - IC ADC 12-BIT 2CHN 12-MSOP LTC2305IDE#TRPBF-ND - IC ADC 12-BIT 2CHN 12-DFN LTC2305IDE#PBF-ND - IC ADC 12-BIT 2CHN 12-DFN LTC2305HMS#TRPBF-ND - IC ADC 12-BIT 2CHN 12-MSOP LTC2305HMS#PBF-ND - IC ADC 12-BIT 2CHN 12-MSOP LTC2305CMS#TRPBF-ND - IC ADC 12-BIT 2CHN 12-MSOP LTC2305CMS#PBF-ND - IC ADC 12-BIT 2CHN 12-MSOP LTC2305CDE#TRPBF-ND - IC ADC 12-BIT 2CHN 12-DFN LTC2305CDE#PBF-ND - IC ADC 12-BIT 2CHN 12-DFN LTC2305IMS#PBF-ND - IC ADC 12BIT I2C 12-MSOP |
LTC2301/LTC2305
15
23015fb
APPLICATIONS INFORMATION
frequency. Figure 4 shows a typical SINAD of 73.2dB with
a 14kHz sampling rate and a 1kHz input. A SNR of 73.3dB
can be achieved with the LTC2301/LTC2305.
Figure 4. 1kHz Sine Wave 8192 Point FFT Plot
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
V
2
2 + V
3
2 + V
4
2...+ V
N
2
V
1
where V1 is the RMS amplitude of the fundamental fre-
quency and V2 through VN aretheamplitudesofthesecond
through Nth harmonics.
Internal Reference
The LTC2301/LTC2305 have an on-chip, temperature
compensated bandgap reference that is factory trimmed
to 2.5V (Refer to Figure 5a). It is internally connected to
a reference amplier and is available at VREF (Pin 7). VREF
should be bypassed to GND with a 2.2μF ceramic capacitor
to minimize noise. An 8k resistor is in series with the output
so that it can be easily overdriven by an external reference
if more accuracy and/or lower drift are required, as shown
in Figure 5b. The reference amplier gains the VREF volt-
age by 1.638 to 4.096V at REFCOMP. To compensate the
reference amplier, bypass REFCOMP with a 10μF ceramic
capacitor in parallel with a 0.1μF ceramic capacitor for best
noise performance. The internal reference buffer can also
be overdriven from 1V to VDD with an external reference at
REFCOMP, as shown in Figure 5c. To do so, VREF must be
grounded to disable the reference buffer. This will result
in an input range of 0V to VREFCOMP in unipolar mode and
±0.5 VREFCOMP in bipolar mode.
R2
R3
REFERENCE
AMP
0.1μF
10μF
2.2μF
REFCOMP
GND
VREF
R1
8k
2.5V
4.096V
LTC2301
LTC2305
23015 F05a
BANDGAP
REFERENCE
Figure 5a. LTC2301/LTC2305 Reference Circuit
Figure 5b. Using the LT1790A-2.5 as an External Reference
Figure 5c. Overdriving REFCOMP Using the LT1790A-4.096
0.1μF
10μF
23015 F05b
LT1790A-2.5
VOUT
VIN
5V
VREF
LTC2301
LTC2305
GND
REFCOMP
2.2μF
0.1μF
10μF
23015 F05c
LT1790A-4.096
VOUT
VIN
5V
VREF
LTC2301
LTC2305
GND
REFCOMP
0.1μF
FREQUENCY (kHz)
0
MAGNITUDE
(dB)
0
–70
–60
–50
–40
–30
–20
–10
–90
–110
–130
–80
–100
–120
–140
5
1234
6
23015 F04
7
SNR = 73.2 dB
SINAD = 73.1 dB
THD = –90dB
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