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参数资料
| 型号： | LTC2246HLU#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | ADC |
| 英文描述： | 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP32 |
| 封装： | 5 X 5 MM, PLASTIC, MS-026, TQFP-32 |
| 文件页数： | 6/16页 |
| 文件大小： | 273K |
| 代理商： | LTC2246HLU#TR |
LTC2246H
14
2246hf
APPLICATIONS INFORMATION
Sleep and Nap Modes
The converter may be placed in shutdown or nap modes
to conserve power. Connecting SHDN to GND results in
normal operation. Connecting SHDN to VDD and OE to VDD
results in sleep mode, which powers down all circuitry
including the reference and typically dissipates 1mW. When
exiting sleep mode it will take milliseconds for the output
data to become valid because the reference capacitors
have to recharge and stabilize. Connecting SHDN to VDD
and OE to GND results in nap mode, which typically dis-
sipates 15mW. In nap mode, the on-chip reference circuit
is kept on, so that recovery from nap mode is faster than
that from sleep mode, typically taking 100 clock cycles. In
both sleep and nap modes, all digital outputs are disabled
and enter the Hi-Z state.
Grounding and Bypassing
The LTC2246H requires a printed circuit board with a clean,
unbroken ground plane. A multilayer board with an internal
ground plane is recommended. Layout for the printed
circuit board should ensure that digital and analog signal
lines are separated as much as possible. In particular, care
should be taken not to run any digital track alongside an
analog signal track or underneath the ADC.
High quality ceramic bypass capacitors should be used at
the VDD, OVDD, VCM, REFH, and REFL pins. Bypass capaci-
tors must be located as close to the pins as possible. Of
particular importance is the 0.1μF capacitor between REFH
and REFL. This capacitor should be placed as close to the
device as possible (1.5mm or less). A size 0402 ceramic
capacitor is recommended. The large 2.2μF capacitor be-
tween REFH and REFL can be somewhat further away. The
traces connecting the pins and bypass capacitors must be
kept short and should be made as wide as possible.
The LTC2246H differential inputs should run parallel and
close to each other. The input traces should be as short
as possible to minimize capacitance and to minimize
noise pickup.
Data Format
Using the MODE pin, the LTC2246H 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 2. MODE Pin Function
MODE Pin
Output Format
Clock Duty
Cycle Stablizer
0
Offset Binary
Off
1/3VDD
Offset Binary
On
2/3VDD
2’s Complement
On
VDD
2’s Complement
Off
Overow Bit
When OF outputs a logic high the converter is either over-
ranged or underranged.
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.
For example if the converter is driving a DSP powered
by a 1.8V supply, then OVDD should be tied to that same
1.8V supply.
OVDD can be powered with any voltage from 500mV up to
3.6V. OGND can be powered with any voltage from GND
up to 1V and must be less than OVDD. The logic outputs
will swing between OGND and OVDD.
Output Enable
The outputs may be disabled with the output enable pin,
OE. OE high disables all data outputs including OF.
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| LTC2246HLX | 制造商:LINER 制造商全称:Linear Technology 功能描述:14-Bit, 25Msps 125°C ADC In LQFP |
| LTC2246HLX#PBF | 功能描述:IC ADC 14BIT 25MSPS 48-LQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| LTC2246HLX-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:14-Bit, 25Msps 125°C ADC In LQFP |
| LTC2246HLX-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:14-Bit, 25Msps 125°C ADC In LQFP |
| LTC2246HLX-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:14-Bit, 25Msps 125°C ADC In LQFP |
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