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| 型号： | LTC1407IMSE-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/26页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 3MSPS 10-MSOP |
| 标准包装： | 50 |
| 位数： | 12 |
| 采样率（每秒）： | 3M |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 14mW |
| 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： | 4 个单端，单极；2 个差分，单极 |
| 产品目录页面： | 1346 (CN2011-ZH PDF) |
| 配用： | DC1082A-B-ND - BOARD SAR ADC LTC1407A DC1082A-A-ND - BOARD SAR ADC LTC1407A-1 |
LTC1407-1/LTC1407A-1
13
14071fb
APPLICATIONS INFORMATION
DRIVING THE ANALOG INPUT
The differential analog inputs of the LTC1407-1/LTC1407A-1
are easy to drive. The inputs may be driven differentially or
as a single-ended input (i.e., the CH0– input is AC grounded
at VCC/2). All four analog inputs of both differential analog
input pairs, CH0+ with CH0– and CH1+ with CH1–, 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 LTC1407-1/LTC1407A-1 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
distortion 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 LTC1407-1/LTC1407A-1 depends 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
LTC1407-1/LTC1407A-1.
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 perfor-
mance 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.
LT1801: 80MHz GBWP, –75dBc at 500kHz, 2mA/ampli-
er, 8.5nV/√Hz.
LT1806/LT1807: 325MHz GBWP, –80dBc distortion at
5MHz, unity-gain stable, rail-to-rail in and out, 10mA/am-
plier, 3.5nV/√Hz.
LT1810: 180MHz GBWP, –90dBc distortion at 5MHz,
unity-gain stable, rail-to-rail in and out, 15mA/amplier,
16nV/√Hz.
LinearView is a trademark of Linear Technology Corporation.
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