參數資料
型號: LTC2249IUH#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: -40°C to +85°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: 9/24頁
文件大?。?/td> 547K
代理商: LTC2249IUH#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.
相關PDF資料
PDF描述
LTC2250CUH 10-Bit, 105Msps Low Noise 3V ADCs; Package: QFN; No of Pins: 32; Temperature Range: 0&deg;C to +70&deg;C
LTC2250CUH#TR 10-Bit, 105Msps Low Noise 3V ADCs; Package: QFN; No of Pins: 32; Temperature Range: 0&deg;C to +70&deg;C
LTC2250IUH 10-Bit, 105Msps Low Noise 3V ADCs; Package: QFN; No of Pins: 32; Temperature Range: -40&deg;C to +85&deg;C
LTC2250IUH#TR 10-Bit, 105Msps Low Noise 3V ADCs; Package: QFN; No of Pins: 32; Temperature Range: -40&deg;C to +85&deg;C
LTC2251CUH 10-Bit, 125Msps Low Noise 3V ADCs; Package: QFN; No of Pins: 32; Temperature Range: 0&deg;C to +70&deg;C
相關代理商/技術參數
參數描述
LTC2250 制造商:LINER 制造商全稱:Linear Technology 功能描述:10-Bit, 125/105Msps Low Noise 3V ADCs
LTC2250CUH 制造商:Linear Technology 功能描述:ADC Single Pipelined 105Msps 10-bit Parallel 32-Pin QFN EP
LTC2250CUH#PBF 功能描述:IC ADC 10-BIT 105MSPS 3V 32-QFN RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:12 采樣率(每秒):300k 數據接口:并聯 轉換器數目: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) 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數目和類型:1 個單端,單極;1 個單端,雙極
LTC2250CUH#PBF 制造商:Linear Technology 功能描述:A/D Converter (A-D) IC
LTC2250CUH#TRPBF 功能描述:IC ADC 10BIT 105MSPS 3V 32-QFN RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率(每秒):45k 數據接口:串行 轉換器數目:2 功率耗散(最大):315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC(0.295",7.50mm 寬) 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端,單極