参数资料
型号: LTC1744IFW#TRPBF
厂商: Linear Technology
文件页数: 10/24页
文件大小: 0K
描述: IC ADC 14BIT 50MSPS 48-TSSOP
标准包装: 1,800
位数: 14
采样率(每秒): 50M
数据接口: 并联
转换器数目: 1
功率耗散(最大): 1.5W
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: 48-TFSOP(0.240",6.10mm 宽)
供应商设备封装: 48-TSSOP
包装: 带卷 (TR)
输入数目和类型: 2 个单端,双极;1 个差分,双极
18
LTC1744
1744f
DIGITAL OUTPUTS
Digital Output Buffers
Figure 9 shows an equivalent circuit for a single output
buffer. Each buffer is powered by OVDD and OGND, iso-
lated from the ADC power and ground. The additional
N-channel transistor in the output driver allows operation
down to low voltages. The internal resistor in series with
the output makes the output appear as 50
to external
circuitry and may eliminate the need for external damping
resistors.
Output Loading
As with all high speed/high resolution converters the
digital output loading can affect the performance. The
digital outputs of the LTC1744 should drive a minimal
capacitive load to avoid possible interaction between the
digital outputs and sensitive input circuitry. The output
should be buffered with a device such as an ALVCH16373
CMOS latch. For full speed operation the capacitive load
should be kept under 10pF. A resistor in series with the
output may be used but is not required since the ADC has
a series resistor of 43
on chip.
Lower OVDD voltages will also help reduce interference
from the digital outputs.
Format
The LTC1744 parallel digital output can be selected for
offset binary or 2’s complement format. The format is
selected with the MSBINV pin; high selects offset binary.
Overflow Bit
An overflow output bit indicates when the converter is
overranged or underranged. When OF outputs a logic high
the converter is either overranged or underranged.
Output Clock
The ADC has a delayed version of the ENC input available
as a digital output, CLKOUT. The CLKOUT pin can be used
to synchronize the converter data to the digital system.
This is necessary when using a sinusoidal ENCODE. Data
will be updated just after CLKOUT falls and can be latched
on the rising edge of CLKOUT.
APPLICATIO S I FOR ATIO
WU
U
LTC1744
1744 F09
OVDD
VDD
0.1
F
43
TYPICAL
DATA
OUTPUT
OGND
OVDD
0.5V TO
VDD
PREDRIVER
LOGIC
DATA
FROM
LATCH
OE
Figure 9. Equivalent Circuit for a Digital Output Buffer
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