參數(shù)資料
型號(hào)： LTC1403AIMSE-1#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 4/22頁(yè)
文件大小： 0K
描述： IC ADC 14BIT 2.8MSPS DIFF 10MSOP
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 14
采樣率（每秒）： 2.8M
數(shù)據(jù)接口： 串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 12mW
電壓電源： 單電源
工作溫度： -40°C ~ 125°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 10-MSOP 裸露焊盤(pán)
包裝： 帶卷 (TR)
輸入數(shù)目和類(lèi)型： 2 個(gè)單端，單極；1 個(gè)差分，單極
配用： DC1082A-D-ND - BOARD SAR ADC LTC1403A
DC1082A-C-ND - BOARD SAR ADC LTC1403A-1
LTC1403-1/LTC1403A-1
12
14031fc
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 LTC1403-1/LTC1403A-1 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+ to ground and a
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.
Figure 1. RC Input Filter
±1.25V range is also ideally suited for AC-coupled signals
in single supply applications. Figure 2 shows how to AC
couple signals in a single supply system without needing
a mid-supply 1.5V external reference. The DC common
mode level is supplied by the previous stage that is already
bounded by the single supply voltage of the system. The
common mode range of the inputs extend from ground
to the supply voltage VDD. If the difference between the
AIN+ and AIN– inputs exceeds 1.25V, the output code will
stay fixed at zero and all ones and if this difference goes
below –1.25V, the output code will stay fixed at one and
all zeros.
10F
VCM
1.5V DC
11
3
AIN–
LTC1403-1/
LTC1403A-1
AIN+
47pF
2
1
51
GND
VREF
1403A F01
+
AIN+
C4
10F
14031 F02
R2
1.6k
C2
1F
C1
1F
C1, C2: FILM TYPE
C3: COG TYPE
C4: CERAMIC BYPASS
R1
1.6k
1
2
3
LTC1403-1/
LTC1403A-1
AIN–
VREF
R3
51
C3
56pF
VIN
Figure 2. AC Coupling of AC Signals with 1kHz Low Cut
INPUT RANGE
The analog inputs of the LTC1403-1/LTC1403A-1 may be
driven fully differentially with a single supply. Each input
may swing up to 3VP-P individually. In the conversion
range, each input is always up to 1.25V more positive or
morenegativethantheinvertinginputofeachchannel.The
INTERNAL REFERENCE
The LTC1403-1/LTC1403A-1 has an on-chip, temperature
compensated, bandgap reference that is factory trimmed
near 2.5V to obtain ±1.25V 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 per-
formance, a 10F ceramic or a 10F tantalum in parallel
with a 0.1F ceramic is recommended. The VREF pin can
be overdriven with an external reference as shown in
Figure 3. The voltage of the external reference must be
higher than the 2.5V of the class A pull-up output of the
Figure 3
GND
LTC1403-1/
LTC1403A-1
VREF
10F
11
3
3VREF
14031 F03
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