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參數(shù)資料
| 型號： | LTC2308IUF#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT 8CH 500KSPS 24-QFN |
| 標準包裝： | 91 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 500k |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 轉換器數(shù)目： | 1 |
| 功率耗散（最大）： | 17.5mW |
| 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： | 24-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 24-QFN 裸露焊盤（4x4） |
| 包裝： | 管件 |
| 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 |
| 產(chǎn)品目錄頁面： | 1349 (CN2011-ZH PDF) |
| 配用： | DC1186A-ND - BOARD SAR ADC LTC2308 |
LTC2308
13
2308fb
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.
Internal Reference
The LTC2308 has an on-chip, temperature compensated
bandgap reference that is factory trimmed to 2.5V (Refer
to Figure 6a). 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 tantalum 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 6b. The reference amplier gains the
VREF voltage by 1.638 to 4.096V at REFCOMP (Pin 8). To
compensate the reference amplier, bypass REFCOMP
with a 10μF ceramic or tantalum capacitor in parallel with
a 0.1μF ceramic capacitor for best noise performance. The
internal reference buffer can also be overdriven from 1V
to AVDD with an external reference at REFCOMP as shown
in Figure 6c. 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.
Internal Conversion Clock
The internal conversion clock is factory trimmed to
achieve a typical conversion time (tCONV) of 1.3μs and a
maximum conversion time of 1.6μs over the full operat-
ing temperature range. With a typical acquisition time of
240ns, a throughput sampling rate of 500ksps is tested
and guaranteed.
APPLICATIONS INFORMATION
Figure 6a. LTC2308 Reference Circuit
Figure 6b. Using the LT1790A-2.5 as an External Reference
R2
R3
REFERENCE
AMP
0.1μF
10μF
2.2μF
REFCOMP
GND
VREF
R1
8k
2.5V
4.096V
LTC2308
2308 F06a
BANDGAP
REFERENCE
0.1μF
10μF
2308 F06b
LT1790A-2.5
VOUT
VIN
5V
VREF
LTC2308
GND
REFCOMP
+
2.2μF
0.1 F
0.1μF
10μF
2308 F06c
LT1790A-4.096
VOUT
VIN
5V
VREF
LTC2308
GND
REFCOMP
+
Figure 6c. Overdriving REFCOMP Using the LT1790A-4.096
Digital Interface
The LTC2308 communicates via a standard 4-wire SPI
compatible digital interface. The rising edge of CONVST
initiates a conversion. After the conversion is nished, pull
CONVST low to enable the serial output (SDO). The ADC
shifts out the digital data in 2’s complement format when
operating in bipolar mode or in straight binary format when
in unipolar mode, based on the setting of the UNI bit.
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