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| 型号： | LTC1415ISW#TR |
| 厂商： | Linear Technology |
| 文件页数： | 7/24页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 1.25MSPS SMP 28SOIC |
| 标准包装： | 1,000 |
| 位数： | 12 |
| 采样率（每秒）： | 1.25M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 100mW |
| 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： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个单端，双极；1 个差分，双极 |
15
LTC1415
APPLICATIONS INFORMATION
WU
U
width for these tracks should be as wide as possible. In
applications where the ADC data outputs and control
signals are connected to a continuously active micropro-
cessor bus, it is possible to get errors in the conversion
results. These errors are due to feedthrough from the
microprocessor to the successive approximation com-
parator. The problem can be eliminated by forcing the
microprocessor into a WAIT state during conversion or by
using three-state buffers to isolate the ADC data bus. The
traces connecting the pins and bypass capacitors must be
kept short and should be made as wide as possible.
The LTC1415 has differential inputs to minimize noise
coupling. Common mode noise on the + AIN and – AIN
leads will be rejected by the input CMRR. The – AIN input
can be used as a ground sense for the + AIN input; the
LTC1415 will hold and convert the difference voltage
between + AIN and –AIN. The leads to + AIN (Pin 1) and – AIN
(Pin 2) should be kept as short as possible. In applications
where this is not possible, the + AIN and – AIN traces should
be run side by side to equalize coupling.
SUPPLY BYPASSING
High quality, low series resistance ceramic, 10
F bypass
capacitors should be used at the VDD and REFCOMP pins
as shown in the Typical Application on the fist page of this
data sheet. Surface mount ceramic capacitors such as
Murata GRM235Y5V106Z016 provide excellent bypass-
ing in a small board space. Alternatively 10
F tantalum
capacitors in parallel with 0.1
F ceramic capacitors can be
used. Bypass capacitors must be located as close to the
pins as possible. The traces connecting the pins and the
bypass capacitors must be kept short and should be made
as wide as possible.
Example Layout
Figures 13a, 13b, 13c and 13d show the schematic and
layout of a suggested evaluation board. The layout demon-
strates the proper use of decoupling capacitors and ground
plane with a two layer printed circuit board.
LTC1415 F12
+AIN
AGND
REFCOMP
AVDD
DVDD
OGND
LTC1415
DIGITAL
SYSTEM
0.1
F
+
–
ANALOG
INPUT
CIRCUITRY
5
4
2
28
27
OVDD
26
19
DGND
14
1
0.1
F
10
F
10
F
–AIN
+
ANALOG GROUND PLANE
Figure 12. Power Supply Grounding Practice
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