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| 型号： | LTC2356IMSE-14#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/18页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 3.5MSPS 10-MSOP |
| 标准包装： | 50 |
| 位数： | 14 |
| 采样率（每秒）： | 3.5M |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 18mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
| 包装： | 管件 |
| 输入数目和类型： | 2 个单端，双极；1 个差分，双极 |
| 产品目录页面： | 1349 (CN2011-ZH PDF) |
| 配用： | DC1082A-E-ND - BOARD SAR ADC LTC2356-14 |
LTC2356-12/LTC2356-14
12
2356fb
GND
LTC2356-12/
LTC2356-14
LT1790-3
VREF
10F
3.5V TO 18V
11
3
3V
2356 F03
+
AIN+
C4
10F
2356 F02
R2
1.6k
C2
1F
C1
1F
C1, C2: FILM TYPE
C3: COG TYPE
C4: CERAMIC BYPASS
R1
1.6k
1
2
3
LTC2356-12/
LTC2356-14
AIN–
VREF
R3
51
C3
56pF
VIN
10F
VCM
1.5V DC
11
3
AIN–
LTC2356-12/
LTC2356-14
AIN+
47pF
2
1
51
GND
VREF
2356 F01
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 LTC2356-12/LTC2356-14 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.
Figure 1. RC Input Filter
inverting input. The ±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
withoutneedingamid-supply1.5Vexternalreference.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.
Figure 2. AC Coupling of AC Signals with 1kHz
Low Cutoff Frequency
INPUT RANGE
The analog inputs of the LTC2356-12/LTC2356-14 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 non-inverting input should never be
more than 1.25V more positive or more negative than the
INTERNAL REFERENCE
TheLTC2356-12/LTC2356-14hasanon-chip,temperature
compensated, bandgap reference that is factory trimmed
to 2.5V to obtain a bipolar ±1.25V input span. The refer-
ence 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, a 10F ceramic or a 10F tantalum in paral-
lel with a 0.1F ceramic is recommended. The VREF pin
can be overdriven with an external reference as shown in
Figure 3. Overdriving VREF Pin with an External Reference
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