參數資料
型號: LTC1748CFW
廠商: LINEAR TECHNOLOGY CORP
元件分類: ADC
英文描述: 14-Bit, 80Msps Low Noise ADC
中文描述: 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO48
封裝: 6.10 MM, PLASTIC, TSSOP-48
文件頁數: 15/20頁
文件大小: 533K
代理商: LTC1748CFW
15
LTC1748
1748fa
Any noise present on the encode signal will result in
additional aperture jitter that will be RMS summed with the
inherent ADC aperture jitter.
In applications where jitter is critical (high input frequen-
cies) take the following into consideration:
1. Differential drive should be used.
2. Use as large an amplitude as possible; if transformer
coupled use a higher turns ratio to increase the
amplitude.
3. If the ADC is clocked with a sinusoidal signal, filter the
encode signal to reduce wideband noise.
4. Balance the capacitance and series resistance at both
encode inputs so that any coupled noise will appear at
both inputs as common mode noise.
APPLICATIOU
W
U
U
V
DD
LTC1748
1748 F07
BIAS
V
DD
5V
ENC
ENC
ANALOG INPUT
2V BIAS
2V BIAS
1:4
0.1
μ
F
CLOCK
INPUT
50
6k
6k
TO INTERNAL
ADC CIRCUITS
Figure 7. Transformer Driven ENC/ENC
1748 F08a
ENC
2V
V
THRESHOLD
= 2V
ENC
0.1
μ
F
LTC1748
1748 F08b
ENC
ENC
130
3.3V
3.3V
130
Q0
D0
Q0
MC100LVELT22
LTC1748
83
83
Figure 8a. Single-Ended ENC Drive,
Not Recommended for Low Jitter
Figure 8b. ENC Drive Using a CMOS-to-PECL Translator
The encode inputs have a common mode range of 1.8V to
V
DD
. Each input may be driven from ground to V
DD
for
single-ended drive.
Maximum and Minimum Encode Rates
The maximum encode rate for the LTC1748 is 80Msps. For
the ADC to operate properly the encode signal should have
a 50% (
±
4%) duty cycle. Each half cycle must have at least
6ns for the ADC internal circuitry to have enough settling
time for proper operation. Achieving a precise 50% duty
cycle is easy with differential sinusoidal drive using a
transformer or using symmetric differential logic such as
PECL or LVDS. When using a single-ended encode signal
asymmetric rise and fall times can result in duty cycles that
are far from 50%.
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