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參數(shù)資料
| 型號： | LTC2291 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual 12-Bit, 65/40/25Msps Low Power 3V ADCs |
| 中文描述： | 雙12位，65/40/25Msps低功耗3V的模數(shù)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大小： | 1020K |
| 代理商： | LTC2291 |
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LTC2293/LTC2292/LTC2291
16
229321f
sensitive applications, the analog inputs can be driven
single-ended with slightly worse harmonic distortion. The
CLK input is single-ended. The LTC2293/LTC2292/
LTC2291 have two phases of operation, determined by the
state of the CLK input pin.
Each pipelined stage shown in Figure 1 contains an ADC,
a reconstruction DAC and an interstage residue amplifier.
In operation, the ADC quantizes the input to the stage and
the quantized value is subtracted from the input by the
DAC to produce a residue. The residue is amplified and
output by the residue amplifier. Successive stages operate
out of phase so that when the odd stages are outputting
their residue, the even stages are acquiring that residue
and vice versa.
When CLK is low, the analog input is sampled differentially
directly onto the input sample-and-hold capacitors, inside
the “Input S/H” shown in the block diagram. At the instant
that CLK transitions from low to high, the sampled input is
held. While CLK is high, the held input voltage is buffered
by the S/H amplifier which drives the first pipelined ADC
stage. The first stage acquires the output of the S/H during
this high phase of CLK. When CLK goes back low, the first
stage produces its residue which is acquired by the
second stage. At the same time, the input S/H goes back
to acquiring the analog input. When CLK goes back high,
the second stage produces its residue which is acquired
by the third stage. An identical process is repeated for the
APPLICATIU
W
U
U
third, fourth and fifth stages, resulting in a fifth stage
residue that is sent to the sixth stage ADC for final
evaluation.
Each ADC stage following the first has additional range to
accommodate flash and amplifier offset errors. Results
from all of the ADC stages are digitally synchronized such
that the results can be properly combined in the correction
logic before being sent to the output buffer.
SAMPLE/HOLD OPERATION AND INPUT DRIVE
Sample/Hold Operation
Figure 2 shows an equivalent circuit for the LTC2293/
LTC2292/LTC2291 CMOS differential sample-and-hold.
The analog inputs are connected to the sampling capaci-
tors (C
SAMPLE
) through NMOS transistors. The capacitors
shown attached to each input (C
PARASITIC
) are the summa-
tion of all other capacitance associated with each input.
During the sample phase when CLK is low, the transistors
connect the analog inputs to the sampling capacitors and
they charge to and track the differential input voltage.
When CLK transitions from low to high, the sampled input
voltage is held on the sampling capacitors. During the hold
phase when CLK is high, the sampling capacitors are
disconnected from the input and the held voltage is passed
to the ADC core for processing. As CLK transitions from
high to low, the inputs are reconnected to the sampling
Figure 2. Equivalent Input Circuit
V
DD
V
DD
V
DD
15
15
C
PARASITIC
1pF
C
PARASITIC
1pF
C
SAMPLE
C
SAMPLE
LTC2293/LTC2292/LTC2291
A
IN
+
A
IN
–
CLK
229321 F02
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC2291UP | Dual 12-Bit, 65/40/25Msps Low Power 3V ADCs |
| LTC2292CUP | Dual 12-Bit, 65/40/25Msps Low Power 3V ADCs |
| LTC2292IUP | Dual 12-Bit, 65/40/25Msps Low Power 3V ADCs |
| LTC2292UP | Dual 12-Bit, 65/40/25Msps Low Power 3V ADCs |
| LTC2293CUP | Dual 12-Bit, 65/40/25Msps Low Power 3V ADCs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2291CUP | 制造商:Linear Technology 功能描述:ADC Dual Pipelined 25Msps 12-bit Parallel 64-Pin QFN EP |
| LTC2291CUP#PBF | 功能描述:IC ADC DUAL 12BIT 25MSPS 64QFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個單端，單極；2 個差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| LTC2291CUP#TRPBF | 功能描述:IC ADC DUAL 12BIT 25MSPS 64QFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| LTC2291CUPPBF | 制造商:Linear Technology 功能描述:ADC Dual 25Msps 12-Bit Parallel QFN64EP |
| LTC2291IUP | 制造商:Linear Technology 功能描述:MS-ADC/High Speed, Dual 12-bit, 25Msps Low Power ADC |
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