参数资料
型号: LTC2174CUKG-14#TRPBF
厂商: Linear Technology
文件页数: 15/34页
文件大小: 0K
描述: IC ADC 14BIT 105MSPS QUAD 52QFN
标准包装: 2,000
位数: 14
采样率(每秒): 105M
数据接口: Serial LVDS
转换器数目: 4
功率耗散(最大): 533mW
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: 52-WFQFN 裸露焊盘
供应商设备封装: 52-QFN(7x8)
包装: 带卷 (TR)
输入数目和类型: 2 Differential; 2 Single-Ended
配用: DC1371A-ND - BOARD USB DATA ACQUISITION HS
LTC2175-14/
LTC2174-14/LTC2173-14
22
21754314fa
applicaTions inForMaTion
The differential encode mode is recommended for sinu-
soidal, PECL, or LVDS encode inputs (Figures 12 and 13).
The encode inputs are internally biased to 1.2V through
10k equivalent resistance. The encode inputs can be taken
above VDD (up to 3.6V), and the common mode range is
from 1.1V to 1.6V. In the differential encode mode, ENC
should stay at least 200mV above ground to avoid falsely
triggering the single-ended encode mode. For good jitter
performance ENC+ should have fast rise and fall times.
Thesingle-endedencodemodeshouldbeusedwithCMOS
encode inputs. To select this mode, ENCis connected
to ground and ENC+ is driven with a square wave encode
input. ENC+ can be taken above VDD (up to 3.6V) so 1.8V
to3.3VCMOSlogiclevelscanbeused.TheENC+threshold
is 0.9V. For good jitter performance ENC+ should have fast
rise and fall times.
Clock PLL and Duty Cycle Stabilizer
The encode clock is multiplied by an internal phase-locked
loop (PLL) to generate the serial digital output data. If the
encode signal changes frequency or is turned off, the PLL
requires 25s to lock onto the input clock.
A clock duty cycle stabilizer circuit allows the duty cycle
of the applied encode signal to vary from 30% to 70%.
In the serial programming mode it is possible to disable
the duty cycle stabilizer, but this is not recommended. In
the parallel programming mode the duty cycle stabilizer
is always enabled.
Figure 13. PECL or LVDS Encode Drive
Figure 12. Sinusoidal Encode Drive
50
100
0.1F
T1
T1 = MA/COM ETC1-1-13
RESISTORS AND CAPACITORS
ARE 0402 PACKAGE SIZE
50
LTC2175-14
217514 F12
ENC–
ENC+
ENC+
ENC
PECL OR
LVDS
CLOCK
0.1F
217514 F13
LTC2175-14
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