参数资料
| 型号： | LTC6360CDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC DRIVER TRUE ZERO 8DFN |
| 标准包装： | 121 |
| 类型： | ADC 驱动器 |
| 应用： | 数据采集 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（3x3） |
| 包装： | 管件 |
LTC6360
17
6360f
applicaTions inForMaTion
routing. The CPI pin can be filtered with several high qual-
ity X5R or X7R capacitors returned to GND with minimal
trace routing. Small geometry (e.g., 0603) surface mount
ceramic capacitors have a much higher self resonant
frequency than do leaded capacitors, and perform best
with the LTC6360.
Stray parasitic capacitance at the –IN pin should be kept
to a minimum to prevent degraded stability response re-
sulting in excessive ringing or oscillations. Traces at –IN
should be kept as short as possible, and any ground plane
should be stripped from under the pin and trace.
The RC filter network at the output serves both as a filter
and compensation network. Parasitic trace inductance
in this path will tend to destabilize the amplifier. The RC
filter network at the output should return directly to a
low impedance ground plane and trace routing should be
minimized in this path. A high quality COG/NPO surface
mount capacitor should be used to optimize distortion
performanceandreducedestabilizingseriesresistanceand
inductance.Whenlargefiltercapacitorvaluesarerequired,
multiple surface mount capacitors may be necessary with
the smallest-valued capacitor placed closest to the output.
TheDC1639Ademoboardhasbeendesignedfortheevalu-
ation of the LTC6360 following the above layout practices.
Its schematic and layout are shown in Figures 10 and 11.
Lower value gain and feedback resistors, RG and RF, will
result in lower output noise at the expense of increased
distortion due to increased loading of the amplifier.
External loading should not be less than 2kΩ to avoid de-
grading distortion performance. When using RS equal to
RF||RG, wideband noise can be substantially reduced by
bypassing with a small capacitor across RF.
Using a single pole passive RC filter network at the output
of the LTC6360 reduces the output noise bandwidth and
thereby increases the signal to noise ratio of the system.
For example, in a typical system with an output sig-
nal of 4VP-P, an RC output filter with RFILT = 10Ω and
CFILT = 330pF will reduce the total integrated noise from
57V (250MHz –3dB bandwidth at OUT) to 27V (48MHz
–3dBbandwidth)andimprovetheSNRfrom90dBto97dB.
Keep in mind that long RC time constants in the output
filter can increase the settling time at the inputs of the
ADC.Incompletesettlingcancausegainerrorsorincrease
apparent crosstalk in multiplexed systems.
Board Layout and Bypass Capacitors/DC1639A
Demoboard
It is recommended that a high quality X5R or X7R, 0.1μF
bypass capacitor be placed directly between the VCC and
the GND pin; the GND pin (exposed pad) should be tied
directly to a low impedance ground plane with minimal
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