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參數(shù)資料
| 型號： | LTC2249CUH#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 14-Bit, 80Msps Low Power 3V ADC; Package: QFN; No of Pins: 32; Temperature Range: 0°C to +70°C |
| 中文描述： | 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC32 |
| 封裝： | 5 X 5 MM, PLASTIC, MO-220-WHHD, QFN-32 |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 547K |
| 代理商： | LTC2249CUH#TR |
LTC2249
17
2249fa
APPLICATIO S I FOR ATIO
WU
UU
DIGITAL OUTPUTS
Table 1 shows the relationship between the analog input
voltage, the digital data bits, and the overflow bit.
As with all high speed/high resolution converters, the
digital output loading can affect the performance. The
digital outputs of the LTC2249 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.
Lower OVDD voltages will also help reduce interference
from the digital outputs.
Data Format
Using the MODE pin, the LTC2249 parallel digital output
can be selected for offset binary or 2’s complement
format. Connecting MODE to GND or 1/3VDD selects offset
binary output format. Connecting MODE to
2/3VDD or VDD selects 2’s complement output format.
An external resistor divider can be used to set the 1/3VDD
or 2/3VDD logic values. Table 2 shows the logic states for
the MODE pin.
Table 1. Output Codes vs Input Voltage
AIN+ – AIN–
D13 – D0
(2V Range)
OF
(Offset Binary)
(2’s Complement)
>+1.000000V
1
11 1111 1111 1111
01 1111 1111 1111
+0.999878V
0
11 1111 1111 1111
01 1111 1111 1111
+0.999756V
0
11 1111 1111 1110
01 1111 1111 1110
+0.000122V
0
10 0000 0000 0001
00 0000 0000 0001
0.000000V
0
10 0000 0000 0000
00 0000 0000 0000
–0.000122V
0
01 1111 1111 1111
11 1111 1111 1111
–0.000244V
0
01 1111 1111 1110
11 1111 1111 1110
–0.999878V
0
00 0000 0000 0001
10 0000 0000 0001
–1.000000V
0
00 0000 0000 0000
10 0000 0000 0000
<–1.000000V
1
00 0000 0000 0000
10 0000 0000 0000
Digital Output Buffers
Figure 14 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.
Figure 14. Digital Output Buffer
LTC2249
2249 F12
OVDD
VDD
0.1
F
43
TYPICAL
DATA
OUTPUT
OGND
OVDD
0.5V
TO 3.6V
PREDRIVER
LOGIC
DATA
FROM
LATCH
OE
Table 2. MODE Pin Function
Clock Duty
MODE Pin
Output Format
Cycle Stablizer
0
Offset Binary
Off
1/3VDD
Offset Binary
On
2/3VDD
2’s Complement
On
VDD
2’s Complement
Off
Overflow Bit
When OF outputs a logic high the converter is either
overranged or underranged.
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| LTC2249IUH | 制造商:Linear Technology 功能描述:ADC Single Pipelined 80Msps 14-bit Parallel 32-Pin QFN EP |
| LTC2249IUH#PBF | 功能描述:IC ADC 14BIT 80MSPS LP 32-QFN 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(biāo)準(zhǔn)包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| LTC2249IUH#PBF | 制造商:Linear Technology 功能描述:IC, ADC, 14BIT, 80MSPS, QFN-32 |
| LTC2249IUH#TR | 制造商:Linear Technology 功能描述:ADC Single Pipelined 80Msps 14-bit Parallel 32-Pin QFN EP T/R |
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