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| 型号： | LTC1403ACMSE#TR |
| 厂商： | Linear Technology |
| 文件页数： | 20/20页 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT 2.8MSPS DIFF 10MSOP |
| 标准包装： | 2,500 |
| 位数： | 14 |
| 采样率（每秒）： | 2.8M |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 12mW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°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： | 带卷 (TR) |
| 输入数目和类型： | 2 个单端，单极；1 个差分，单极 |
| 配用： | DC1082A-D-ND - BOARD SAR ADC LTC1403A DC1082A-C-ND - BOARD SAR ADC LTC1403A-1 |
LTC1403/LTC1403A
9
1403fb
APPLICATIONS INFORMATION
DRIVING THE ANALOG INPUT
The differential analog inputs of the LTC1403/LTC1403A
are easy to drive. The inputs may be driven differentially or
as a single-ended input (i.e., the AIN– input is grounded).
Both differential analog inputs, AIN+ with AIN–, are sampled
at the same instant. Any unwanted signal that is common
to both inputs of each input pair will be reduced by the
common mode rejection of the sample-and-hold circuit.
The inputs draw only one small current spike while charging
the sample-and-hold capacitors at the end of conversion.
During conversion, the analog inputs draw only a small
leakage current. If the source impedance of the driving
circuit is low, then the LTC1403/LTC1403A inputs can be
driven directly. As source impedance increases, so will
acquisition time. For minimum acquisition time with high
source impedance, a buffer amplier must be used. The
main requirement is that the amplier driving the analog
input(s) must settle after the small current spike before
the next conversion starts (settling time must be 39ns for
full throughput rate). Also keep in mind while choosing an
input amplier, the amount of noise and harmonic distor-
tion added by the amplier.
CHOOSING AN INPUT AMPLIFIER
Choosing an input amplier is easy if a few requirements
are taken into consideration. First, to limit the magnitude
of the voltage spike seen by the amplier from charging
the sampling capacitor, choose an amplier that has a low
output impedance (<100Ω) at the closed-loop bandwidth
frequency. For example, if an amplier is used in a gain
of 1 and has a unity-gain bandwidth of 50MHz, then the
output impedance at 50MHz must be less than 100Ω. The
second requirement is that the closed-loop bandwidth must
be greater than 40MHz to ensure adequate small-signal
settling for full throughput rate. If slower op amps are
used, more time for settling can be provided by increasing
the time between conversions. The best choice for an op
amp to drive the LTC1403/LTC1403A will depend on the
application. Generally, applications fall into two categories:
AC applications where dynamic specications are most
critical and time domain applications where DC accuracy
and settling time are most critical. The following list is
a summary of the op amps that are suitable for driving
the LTC1403/LTC1403A. (More detailed information is
available in the Linear Technology Databooks and on the
LinearViewTM CD-ROM.)
LTC1566-1:
Low Noise 2.3MHz Continuous Time Low-
Pass Filter.
LT1630: Dual 30MHz Rail-to-Rail Voltage FB Amplier.
2.7V to ±15V supplies. Very high AVOL, 500μV offset and
520ns settling to 0.5LSB for a 4V swing. THD and noise
are –93dB to 40kHz and below 1LSB to 320kHz (AV = 1,
2VP-P into 1kΩ, VS = 5V), making the part excellent for AC
applications (to 1/3 Nyquist) where rail-to-rail performance
is desired. Quad version is available as LT1631.
LT1632: Dual 45MHz Rail-to-Rail Voltage FB Amplier.
2.7V to ±15V supplies. Very high AVOL, 1.5mV offset and
400ns settling to 0.5LSB for a 4V swing. It is suitable
for applications with a single 5V supply. THD and noise
are –93dB to 40kHz and below 1LSB to 800kHz (AV = 1,
2VP-P into 1kΩ, VS = 5V), making the part excellent for
AC applications where rail-to-rail performance is desired.
Quad version is available as LT1633.
LT1813: Dual 100MHz 750V/μs 3mA Voltage Feedback
Amplier. 5V to ±5V supplies. Distortion is –86dB to
100kHz and –77dB to 1MHz with ±5V supplies (2VP-P
into 500Ω). Excellent part for fast AC applications with
±5V supplies.
LT1801: 80MHz GBWP, –75dBc at 500kHz, 2mA/Amplier,
8.5nV/√Hz.
LT1806/LT1807: 325MHz GBWP, –80dBc Distortion at
5MHz, Unity-Gain Stable, R-R In and Out, 10mA/Ampli-
er, 3.5nV/√Hz.
LT1810: 180MHz GBWP, –90dBc Distortion at 5MHz, Unity-
Gain Stable, R-R In and Out, 15mA/Amplier, 16nV/√Hz.
LT1818/LT1819: 400MHz, 2500V/μs,9mA, Single/Dual
Voltage Mode Operational Amplier.
LT6200: 165MHz GBWP, –85dBc Distortion at 1MHz,
Unity-Gain Stable, R-R In and Out, 15mA/Amplier,
0.95nV/√Hz.
LT6203: 100MHz GBWP, –80dBc Distortion at 1MHz, Unity-
Gain Stable, R-R In and Out, 3mA/Amplier, 1.9nV/√Hz.
LT6600-10: Amplier/Filter Differential In/Out with 10MHz
Cutoff.
LinearView is a trademark of Linear Technology Corporation.
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