參數(shù)資料
型號: DDC114EK
廠商: Diodes Inc.
英文描述: NPN PRE-BIASED SMALL SIGNAL SOT-26 DUAL SURFACE MOUNT TRANSISTOR
中文描述: npn型預(yù)偏置信號小的SOT - 26表面貼裝晶體管雙
文件頁數(shù): 26/30頁
文件大?。?/td> 389K
代理商: DDC114EK
""#
SBAS255A JUNE 2004 REVISED NOVEMBER 2004
www.ti.com
26
Integrate Side B
PowerUp
Initialization
Release State
Start
Integration
CONV
Power Supplies
t
33
t
32
Figure 27. Timing Diagram at Power-Up of the DDC114
Table 12. Timing for the DDC114 Power-Up Sequence
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNITS
t32
Power-On Initialization Period
50
μ
s
t33
From Release Edge to Integration Start
50
μ
s
POWER-UP SEQUENCING
Prior to power-up, all digital and analog inputs (excluding
the complementary inputs) must be low. At the time of
power-up, all of these signals should remain low until the
power supplies have stabilized, as shown in Figure 28.
Table 12 shows the timing for the power-up sequence.
LAYOUT
POWER SUPPLIES AND GROUNDING
Both AVDD and DVDD should be as quiet as possible. It
is particularly important to eliminate noise from AVDD that
is non-synchronous with the DDC114 operation. Figure 28
illustrates two acceptable ways to supply power to the
DDC114. The first case shows two separate +5V supplies
for AVDD and DVDD. In this case, each +5V supply of the
DDC114 should be bypassed with 10
μ
F solid tantalum
capacitors and 0.1
μ
F ceramic capacitors. The second
case shows the DVDD power supply derived from the
AVDD supply with a < 10
isolation resistor. In both cases,
the 0.1
μ
F capacitors should be placed as close to the
DDC114 package as possible. It is recommended that
both the analog and digital grounds (AGND and DGND) be
connected to a single ground plane on the PCB.
THERMAL PAD
It is strongly recommended that the thermal pad on the
DDC114 be connected to ground on the PCB. Under no
circumstances should PCB traces be routed underneath
the thermal pad.
DDC114
0.1
μ
F
< 10
10
μ
F
+5V
One +5V Supply
AVDD
DVDD
AVDD
DVDD
AGND
DGND
AGND
DGND
DDC114
0.1
μ
F
0.1
μ
F
0.1
μ
F
10
μ
F
VA
Separate Supplies
10
μ
F
VD
Figure 28. Power-Supply Connection Options
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