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參數(shù)資料
| 型號： | LTC1098 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 串行ADC |
| 英文描述： | Micropower Sampling 8-Bit I/O A/D Converters(5V，微功耗，采樣8位串行I/O模數(shù)轉(zhuǎn)換器) |
| 中文描述： | 微采樣8位I /辦公自動化/ D轉(zhuǎn)換器（5V的，微功耗，采樣8位串行的I / O模數(shù)轉(zhuǎn)換器） |
| 文件頁數(shù)： | 20/28頁 |
| 文件大?。?/td> | 368K |
| 代理商： | LTC1098 |
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20
LTC1096/LTC1096L
LTC1098/LTC1098L
U
S
A
cycle. Large external source resistors and capacitances
will slow the settling of the inputs. It is important that the
overall RC time constants be short enough to allow the
analog inputs to completely settle within the allowed time.
O
PPLICATI
U
U
tive current spike will be generated on the reference pin by
the ADC. These current spikes settle quickly and do not
cause a problem.
Using a slower CLK will allow more time for the reference
to settle. Even at the maximum CLK rate of 500kHz most
references and op amps can be made to settle within the
2
μ
s bit time.
RC Input Filtering
It is possible to filter the inputs with an RC network as
shown in Figure 9. For large values of C
F
(e.g., 1
μ
F), the
capacitive input switching currents are averaged into a net
DC current. Therefore, a filter should be chosen with a
small resistor and large capacitor to prevent DC drops
across the resistor. The magnitude of the DC current is
approximately I
DC
= 25pF(V
IN
/t
CYC
) and is roughly pro-
portional to V
IN
. When running at the minimum cycle time
of 29
μ
s, the input current equals 4.3
μ
A at V
IN
= 5V. In this
case, a filter resistor of 390
will cause 0.1LSB of full-
scale error. If a larger filter resistor must be used, errors
can be eliminated by increasing the cycle time.
R
FILTER
V
IN
C
FILTER
LTC1096/8 F9
LTC1098
“+”
“–”
I
DC
Figure 9. RC Input Filtering
Input Leakage Current
Input leakage currents can also create errors if the source
resistance gets too large. For instance, the maximum
input leakage specification of 1
μ
A (at 125
°
C) flowing
through a source resistance of 3.9k will cause a voltage
drop of 3.9mV or 0.2LSB. This error will be much reduced
at lower temperatures because leakage drops rapidly (see
typical curve of Input Channel Leakage Current vs Tem-
perature).
REFERENCE INPUTS
The voltage on the reference input of the LTC1096 defines
the voltage span of the A/D converter. The reference input
transient capacitive switching currents due to the switched-
capacitor conversion technique (see Figure 10). During
each bit test of the conversion (every CLK cycle), a capaci-
Figure 10. Reference Input Equivalent Circuit
R
ON
5pF TO 30pF
LTC1096
REF
+
5
R
OUT
V
REF
EVERY CLK CYCLE
4
GND
LTC1096/8 F10
Reduced Reference Operation
The minimum reference voltage of the LTC1098 is limited
to 3V because the V
CC
supply and reference are internally
tied together. However, the LTC1096 can operate with
reference voltages below 1V.
The effective resolution of the LTC1096 can be increased
by reducing the input span of the converter. The LTC1096
exhibits good linearity and gain over a wide range of
reference voltages (see typical curves of Linearity and Full
Scale Error vs Reference Voltage). However, care must be
taken when operating at low values of V
REF
because of the
reduced LSB step size and the resulting higher accuracy
requirement placed on the converter. The following fac-
tors must be considered when operating at low V
REF
values.
1. Offset
2. Noise
3. Conversion speed (CLK frequency)
Offset with Reduced V
REF
The offset of the LTC1096 has a larger effect on the output
code when the ADC is operated with reduced reference
voltage. The offset (which is typically a fixed voltage)
becomes a larger fraction of an LSB as the size of the LSB
is reduced. The typical curve of Unadjusted Offset Error vs
Reference Voltage shows how offset in LSBs is related to
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1098AC | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower Sampling 8-Bit Serial I/O A/D Converters |
| LTC1098ACN8 | 功能描述:IC A/D CONV 8BIT SRL IN/OUT 8DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:480µW 電壓電源:單電源 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:38-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)目和類型:16 個單端，雙極；8 個差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| LTC1098ACN8#PBF | 功能描述:IC A/D CONV 8BIT SRL IN/OUT 8DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:480µW 電壓電源:單電源 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:38-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)目和類型:16 個單端，雙極；8 個差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| LTC1098ACN8-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower Sampling 8-Bit Serial I/O A/D Converters |
| LTC1098ACN8-TR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower Sampling 8-Bit Serial I/O A/D Converters |
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