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參數(shù)資料
| 型號(hào)： | DC1082A-F |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 3/18頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | BOARD SAR ADC LTC2355-14 |
| 軟件下載： | QuikEval II System |
| 設(shè)計(jì)資源： | DC1082A Design File DC1082A Schematic |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | QuikEval-II™ |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 3M |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 輸入范圍： | 0 ~ 2.5 V |
| 已用 IC / 零件： | LTC2355-14 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | LTC2355IMSE-14#TRPBF-ND - IC ADC 14BIT 3.5MSPS 10-MSOP LTC2355CMSE-14#TRPBF-ND - IC ADC 14BIT 3.5MSPS 10-MSOP LTC2355CMSE-12#TRPBF-ND - IC ADC 12BIT 3.5MSPS 10-MSOP LTC2355IMSE-12#TRPBF-ND - IC ADC 12BIT 3.5MSPS 10-MSOP LTC2355IMSE-14#PBF-ND - IC ADC 14BIT 3.5MSPS 10-MSOP LTC2355IMSE-12#PBF-ND - IC ADC 12BIT 3.5MSPS 10-MSOP LTC2355CMSE-14#PBF-ND - IC ADC 14BIT 3.5MSPS 10-MSOP LTC2355CMSE-12#PBF-ND - IC ADC 12BIT 3.5MSPS 10-MSOP |
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LTC2355-12/LTC2355-14
2355fa
applications inFormation
INPUT FILTERING AND SOURCE IMPEDANCE
The noise and the distortion of the input amplifier and
other circuitry must be considered since they will add to
the LTC2355-12/LTC2355-14 noise and distortion. The
small-signal bandwidth of the sample-and-hold circuit is
50MHz. Any noise or distortion products that are pres-
ent at the analog inputs will be summed over this entire
bandwidth. Noisy input circuitry should be filtered prior
to the analog inputs to minimize noise. A simple 1-pole
RC filter is sufficient for many applications. For example,
Figure 1 shows a 47pF capacitor from AIN+togroundanda
51Ωsourceresistortolimittheinputbandwidthto47MHz.
The 47pF capacitor also acts as a charge reservoir for the
input sample-and-hold and isolates the ADC input from
sampling-glitchsensitivecircuitry.Highqualitycapacitors
and resistors should be used since these components
can add distortion. NPO and silvermica 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 film
surface mount resistors are much less susceptible to both
problems.Whenhighamplitudeunwantedsignalsareclose
in frequency to the desired signal frequency, a multiple
pole filter is required. High external source resistance,
combined with the 13pF of input capacitance, will reduce
the rated 50MHz bandwidth and increase acquisition time
beyond 39ns.
INPUT RANGE
The analog inputs of the LTC2355-12/LTC2355-14 may be
driven fully differentially with a single supply. Each input
may swing up to 2.5VP-P individually. When using the
internal reference, the noninverting input should never be
more than 2.5V more positive than the inverting input. The
0V to 2.5V range is also ideally suited for single-ended
input use with single supply applications. The common
mode range of the inputs extend from ground to the sup-
ply voltage VDD. If the difference between the AIN+ and
AIN– inputs exceeds 2.5V, the output code will stay fixed
at all ones and if this difference goes below 0V, the ouput
code will stay fixed at all zeros.
INTERNAL REFERENCE
TheLTC2355-12/LTC2355-14hasanon-chip,temperature
compensated, bandgap reference that is factory trimmed
to 2.5V to obtain a unipolar 0V to 2.5V input span. The
reference amplifier output VREF, (Pin 3) must be bypassed
with a capacitor to ground. The reference amplifier is
stable with capacitors of 1F or greater. For the best noise
performance,a10Fceramicora10Ftantaluminparallel
with a 0.1F ceramic is recommended. The VREFpincanbe
overdriven with an external reference as shown in Figure
2. The voltage of the external reference must be higher
than the 2.5V output of the internal reference. The recom-
mended range for an external reference is 2.55V to VDD.
An external reference at 2.55V will see a DC quiescent load
of 0.75mA and as much as 3mA during conversion.
Figure 1. RC Input Filter
Figure 2. Overdriving VREF Pin with an External Reference
10F
11
3
AIN–
LTC2355-12/
LTC2355-14
AIN+
47pF
2
1
51
GND
VREF
2355 F01
GND
LTC2355-12/
LTC2355-14
LT1790-3
VREF
10F
3.5V TO 18V
11
3
3V
2355 F02
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