參數(shù)資料
型號(hào)： LTC1272-8ACN
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： ADC
英文描述： 12-Bit, 3us, 250kHz Sampling A/D Converter
中文描述： 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDIP24
封裝： 0.300 INCH, PLASTIC, DIP-24
文件頁(yè)數(shù)： 11/20頁(yè)
文件大?。?/td> 340K
代理商： LTC1272-8ACN
11
LTC1272
U
S
A
O
PPLICATI
U
U
the foil width for these tracks should be as wide as
possible.
Noise:
Input signal leads to A
IN
and signal return leads
from AGND (pin 3) should be kept as short as possible to
minimize input noise coupling. In applications where this
is not possible, a shielded cable between source and ADC
is recommended. Also, since any potential difference in
grounds between the signal source and ADC appears as an
error voltage in series with the input signal, attention
should be paid to reducing the ground circuit impedances
as much as possible.
In applications where the LTC1272 data outputs and
control signals are connected to a continuously active
microprocessor bus, it is possible to get LSB errors in
conversion results. These errors are due to feedthrough
from the microprocessor to the successive approximation
comparator. The problem can be eliminated by forcing the
microprocessor into a Wait state during conversion (see
Slow Memory Mode interfacing), or by using three-state
buffers to isolate the LTC1272 data bus.
Timing and Control
Conversion start and data read operations are controlled
by three LTC1272 digital inputs; HBEN, CS and RD. Figure
12 shows the logic structure associated with these inputs.
The three signals are internally gated so that a logic “0” is
required on all three inputs to initiate a conversion. Once
initiated it cannot be restarted until conversion is com-
plete. Converter status is indicated by the BUSY output,
and this is low while conversion is in progress.
LTC1272 TA13
A
IN
AGND
V
REF
V
DD
DGND
LTC1272
DIGITAL
SYSTEM
C1
C2
C3
C4
+
–
ANALOG GROUND PLANE
GROUND CONNECTION
TO DIGITAL CIRCUITRY
ANALOG
INPUT
CIRCUITRY
3
2
24
12
1
Figure 11. Power Supply Grounding Practice
Application Hints
Wire wrap boards are not recommended for high resolu-
tion or high speed A/D converters. To obtain the best
performance from the LTC1272 a printed circuit board is
required. 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 LTC1272. The analog input should be
screened by AGND.
A single point analog ground separate from the logic
system ground should be established with an analog
ground plane at pin 3 (AGND) or as close as possible to the
LTC1272, as shown in Figure 11. Pin 12 (LTC1272 DGND)
and all other analog grounds should be connected to this
single analog ground point. No other digital grounds
should be connected to this analog ground point. Low
impedance analog and digital power supply common
returns are essential to low noise operation of the ADC and
R3
15
LTC1272 TA12
–
+
A
IN
AGND
R2
20k
R1
200
V
IN
0V TO 5V
ANALOG
INPUT
A1
LT1007
*ADDITIONAL PINS OMITTED FOR CLARITY
LTC1272
1
3
Figure 10. Unipolar 0V to 5V Operation with Gain Error Adjust
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LTC1272-8ACSW#PBF 功能描述:IC A/D CONV 12BIT SAMPLNG 24SOIC RoHS:是 類(lèi)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:1,000 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(lèi)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(lèi)型:1 個(gè)單端，單極；1 個(gè)單端，雙極
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LTC1272-8ACSW#TRPBF 功能描述:IC A/D CONV 12BIT SAMPLNG 24SOIC RoHS:是 類(lèi)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:1,000 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(lèi)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(lèi)型:1 個(gè)單端，單極；1 個(gè)單端，雙極
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