參數(shù)資料
型號(hào)： LTC2205IUK-14#PBF
廠商： Linear Technology
文件頁數(shù)： 14/28頁
文件大?。?/td> 0K
描述： IC ADC 14BIT 65MSPS 48-QFN
標(biāo)準(zhǔn)包裝： 52
位數(shù)： 14
采樣率（每秒）： 65M
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 776mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 48-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 48-QFN-EP（7x7）
包裝： 管件
輸入數(shù)目和類型： 1 個(gè)差分
配用： DC890B-ND - BOARD USB DATA COLLECTION
LTC2205-14
21
220514fb
Figure 12. Functional Equivalent of Digital Output Randomizer
Data Format
The LTC2205-14 parallel digital output can be selected
for offset binary or 2’s complement format. The format
is selected with the MODE pin. This pin has a four level
logic input, centered at 0, 1/3VDD, 2/3VDD and VDD. An
external resistor divider can be user to set the 1/3VDD
and 2/3VDD logic levels. Table 1 shows the logic states
for the MODE pin.
Table 1. MODE Pin Function
MODE
OUTPUT FORMAT
CLOCK DUTY CYCLE
STABILIZER
0(GND)
Offset Binary
Off
1/3VDD
Offset Binary
On
2/3VDD
2’s Complement
On
VDD
2’s Complement
Off
Overow Bit
An overow output bit (OF) indicates when the converter
is over-ranged or under-ranged. A logic high on the OF
pin indicates an overow or underow.
Output Clock
The ADC has a delayed version of the encode input available
as a digital output. Both a noninverted version, CLKOUT+
and an inverted version CLKOUT– are provided. The
CLKOUT+/CLKOUT– can be used to synchronize the
converter data to the digital system. This is necessary
when using a sinusoidal encode. Data can be latched on
the rising edge of CLKOUT+ or the falling edge of CLKOUT–.
CLKOUT+ falls and CLKOUT– rises as the data outputs
are updated.
Digital Output Randomizer
Interference from the ADC digital outputs is sometimes
unavoidable. Interference from the digital outputs may be
from capacitive or inductive coupling or coupling through
the ground plane. Even a tiny coupling factor can result in
discernible unwanted tones in the ADC output spectrum.
By randomizing the digital output before it is transmitted
off chip, these unwanted tones can be randomized, trading
a slight increase in the noise oor for a large reduction in
unwanted tone amplitude.
APPLICATIONS INFORMATION
CLKOUT
OF
D13/D0
D12/D0
D2/D0
D1/D0
D0
D1
RAND = HIGH,
SCRAMBLE
ENABLED
D2
D12
D13
OF
LTC2205-14
CLKOUT
RAND
220514 F12
The digital output is “Randomized” by applying an
exclusive-OR logic operation between the LSB and all
other data output bits. To decode, the reverse operation
is applied; that is, an exclusive-OR operation is applied
between the LSB and all other bits. The LSB, OF and
CLKOUT output are not affected. The output Randomizer
function is active when the RAND pin is high.
Output Driver Power
Separate output power and ground pins allow the output
drivers to be isolated from the analog circuitry. The power
supply for the digital output buffers, OVDD, should be tied
to the same power supply as for the logic being driven.
OVDD can be powered with any logic voltage up to the VDD
of the ADC. OGND can be powered with any voltage from
ground up to 1V and must be less than OVDD. The logic
outputs will swing between OGND and OVDD.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC2205IUK-PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 65Msps/40Msps
LTC2205IUK-TR 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 65Msps/40Msps
LTC2205IUK-TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 65Msps/40Msps
LTC2205UK 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 65Msps/40Msps
LTC2205UK-14 制造商:LINER 制造商全稱:Linear Technology 功能描述:14-Bit, 65Msps ADC
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