參數(shù)資料
型號(hào): LTC1278-4ISW
廠商: Linear Technology
文件頁(yè)數(shù): 15/16頁(yè)
文件大?。?/td> 0K
描述: IC A/DCONV SAMPLNG W/SHTDN24SOIC
標(biāo)準(zhǔn)包裝: 32
位數(shù): 12
采樣率(每秒): 400k
數(shù)據(jù)接口: 并聯(lián)
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 150mW
電壓電源: 雙 ±
工作溫度: -40°C ~ 85°C
安裝類型: 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: 管件
輸入數(shù)目和類型: 1 個(gè)單端,單極;1 個(gè)單端,雙極
其它名稱: LTC1278-4IS
8
LTC1278
CONVERSION DETAILS
The LTC1278 uses a successive approximation algorithm
and an internal sample-and-hold circuit to convert an
analog signal to a 12-bit parallel output. The ADC is
complete with a precision reference and an internal clock.
The control logic provides easy interface to microproces-
sors and DSPs. (Please refer to the Digital Interface
section for the data format.)
Conversion start is controlled by the CS and CONVST
inputs. At the start of conversion the successive approxi-
mation register (SAR) is reset. Once a conversion cycle
has begun it cannot be restarted.
During conversion, the internal 12-bit capacitive DAC
output is sequenced by the SAR from the most significant
bit (MSB) to the least significant bit (LSB). Referring to
Figure 1, the AIN input connects to the sample-and-hold
capacitor during the acquire phase, and the comparator
TEST CIRCUITS
Load Circuits for Output Float Delay
Load Circuits for Access Timing
3k
CL
DBN
DGND
A) HIGH-Z TO VOH (t8)
AND VOL TO VOH (t6)
CL
DBN
3k
5V
B) HIGH-Z TO VOL (t8)
AND VOH TO VOL (t6)
DGND
LTC1278 TA08
3k
10pF
DBN
DGND
A) VOH TO HIGH-Z
10pF
DBN
3k
5V
B) VOL TO HIGH-Z
DGND
1278 TA08
SHDN to CONVST Wake-Up Timing
t3
SHDN
CONVST
LTC1278 TC03
APPLICATIONS INFORMATION
WU
U
offset is nulled by the feedback switch. In this acquire
phase, a minimum delay of 200ns will provide enough
time for the sample-and-hold capacitor to acquire the
analog signal. During the convert phase, the comparator
feedback switch opens, putting the comparator into the
VDAC
LTC1278 F1
+
CDAC
DAC
SAMPLE
HOLD
CSAMPLE
S
A
R
12-BIT
LATCH
COMPARATOR
SAMPLE
SI
AIN
Figure 1. AIN Input
CS to RD Setup Timing
t1
CS
RD
LTC1278 TC01
CS to CONVST Setup Timing
t2
CS
CONVST
LTC1278 TC02
TI I G DIAGRA S
WU
W
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LTC1278-4ISW#PBF 功能描述:IC A/DCONV SAMPLNG W/SHTDN24SOIC 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:1,000 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)目和類型:1 個(gè)單端,單極;1 個(gè)單端,雙極
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