參數(shù)資料
型號(hào)： LTC2440IGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 24-Bit High Speed Differential delta-sigma ADC with Selectable Speed/Resolution
中文描述： 1-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁(yè)數(shù)： 11/28頁(yè)
文件大?。?/td> 316K
代理商： LTC2440IGN
LTC2440
11
sn2440, 2440fas
indicator (SIG). If V
IN
is >0, this bit is HIGH. If V
IN
is <0,
this bit is LOW.
Bit 28 (fourth output bit) is the most significant bit (MSB)
of the result. This bit in conjunction with Bit 29 also
provides the underrange or overrange indication. If both
Bit 29 and Bit 28 are HIGH, the differential input voltage is
above +FS. If both Bit 29 and Bit 28 are LOW, the
differential input voltage is below –FS.
The function of these bits is summarized in Table 1.
Table 1. LTC2440 Status Bits
Bit 31
EOC
0
0
0
0
Bit 30 Bit 29 Bit 28
DMY
SIG
0
1
0
1
0
0
0
0
Input Range
V
IN
≥
0.5 V
REF
0V
≤
V
IN
< 0.5 V
REF
–0.5 V
REF
≤
V
IN
< 0V
V
IN
< –0.5 V
REF
MSB
1
0
1
0
Bits ranging from 28 to 5 are the 24-bit conversion result
MSB first.
Bit 5 is the Least Significant Bit (LSB).
Bits ranging from 4 to 0 are sub LSBs below the 24-bit
level. Bits 4 to bit 0 may be included in averaging or
discarded without loss of resolution.
Data is shifted out of the SDO pin under control of the serial
clock (SCK), see Figure 3. Whenever CS is HIGH, SDO
remains high impedance.
In order to shift the conversion result out of the device, CS
must first be driven LOW. EOC is seen at the SDO pin of the
device once CS is pulled LOW. EOC changes real time from
HIGH to LOW at the completion of a conversion. This
REF
+
– REF
–
. Outside this range, the converter indicates
the overrange or the underrange condition using distinct
output codes.
Output Data Format
The LTC2440 serial output data stream is 32-bits long. The
first 3-bits represent status information indicating the sign
and conversion state. The next 24-bits are the conversion
result, MSB first. The remaining 5-bits are sub LSBs
beyond the 24-bit level that may be included in averaging
or discarded without loss of resolution. In the case of
ultrahigh resolution modes, more than 24 effective bits of
performance are possible (see Table 3). Under these
conditions, sub LSBs are included in the conversion result
and represent useful information beyond the 24-bit level.
The third and fourth bit together are also used to indicate
an underrange condition (the differential input voltage is
below –FS) or an overrange condition (the differential
input voltage is above +FS).
For input conditions in excess
of twice full scale (|V
IN
|
≥
V
REF
), the converter may
indicate either overrange or underrange. Once the input
returns to the normal operating range, the conversion
result is immediately accurate within the specifications of
the device.
Bit 31 (first output bit) is the end of conversion (EOC)
indicator. This bit is available at the SDO pin during the
conversion and sleep states whenever the CS pin is LOW.
This bit is HIGH during the conversion and goes LOW
when the conversion is complete.
Bit 30 (second output bit) is a dummy bit (DMY) and is
always LOW.
Bit 29 (third output bit) is the conversion result sign
APPLICATIU
W
U
U
Figure 3. Output Data Timing
MSB
SIG
“0”
1
2
3
4
5
26
27
32
BIT 0
BIT 27
BIT 5
LSB
24
BIT 28
BIT 29
BIT 30
SDO
SCK
BUSY
CS
EOC
BIT 31
SLEEP
DATA OUTPUT
CONVERSION
2440 F03
Hi-Z
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC2440IGN#PBF 功能描述:IC ADC DIFFER 24-BIT HS 16-SSOP 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 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤(pán)（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個(gè)單端，單極 產(chǎn)品目錄頁(yè)面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6
LTC2440IGN#PBF 制造商:Linear Technology 功能描述:A/D Converter (A-D) IC 制造商:Linear Technology 功能描述:IC, ADC, 24BIT, 3.5KHZ, SSOP-16
LTC2440IGN#TR 功能描述:IC CONV A/D 24-BIT DIFF 16-SSOP RoHS:否 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):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)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(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個(gè)單端，單極
LTC2440IGN#TRPBF 功能描述:IC ADC DIFFER 24-BIT HS 16-SSOP 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):16 采樣率（每秒）:45k 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:315mW 電壓電源:模擬和數(shù)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(yīng)商設(shè)備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數(shù)目和類型:2 個(gè)單端，單極
LTC2440IGNPBF 制造商:Linear Technology 功能描述:24-Bit Diff. ADC Speed/Resolution SSOP16
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