VREF GAIN
參數(shù)資料
型號(hào): LTC1405CGN#TRPBF
廠商: Linear Technology
文件頁(yè)數(shù): 3/20頁(yè)
文件大?。?/td> 0K
描述: IC ADC 12BIT 5MSPS SAMPLE 28SSOP
標(biāo)準(zhǔn)包裝: 2,500
位數(shù): 12
采樣率(每秒): 5M
數(shù)據(jù)接口: 并聯(lián)
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 145mW
電壓電源: 雙 ±
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 28-SSOP(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 28-SSOP
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 2 個(gè)單端,雙極;1 個(gè)差分,雙極
11
LTC1405
1405fa
Table 2. Comparison of Analog Input Configurations
SUPPLIES
COUPLING
VREF
GAIN
AIN
+
AIN
COMMENTS
±5V
DC
4.096V
1x
±2.048
0
Best SNR, THD
5V
DC
4.096V
2x
2.5 ± 1.024
2.5
Best SINAD, THD for Single Supply
5V
DC
2.048V
1x
2.5 ± 1.024
2.5
Worse Noise than Above Case
5V
DC
4.096V
1x
2.5 ± 2.048
2.5
Best Single Supply Noise, THD Is Not Optimal
5V
DC
4.096V
1x
0 to 4.096
2.048
Same As Above
±5V
AC
4.096V
1x
±1.024
Very Best SNR, THD
(Transformer)
5V
AC
4.096V
1x
2.5 ± 1.024
Very Best SNR, THD for Single Supply
(Transformer)
APPLICATIO S I FOR ATIO
WU
U
1405 F05
1F
+AIN
VSS
VIN
2.5V
LTC1405
5V
–AIN
VCM
1405 F06
+AIN
VSS
VIN
4.096V
0V
5V
2.048V
LTC1405
5V
–AIN
SENSE
Figure 4. DC Coupling a Ground
Centered Signal (Dual Supply System)
Figure 5. DC Coupling a Signal Centered
Around 2.5V (Single Supply System)
Figure 6. DC Coupling a 0V to 4.096V Signal
AC Coupling the Input
The analog inputs to the LTC1405 can also be AC coupled
through a capacitor, though in most cases it is simpler to
directly couple the input to the ADC. Figure 7 shows an
example where the input signal is centered around ground
and the ADC operates from a single 5V supply. Note that
the performance would improve if the ADC was operated
from a dual supply and the input was directly coupled (as
in Figure 4). With AC coupling the DC resistance to ground
should be roughly matched for AIN+ and AIN– to maintain
offset accuracy.
DC Coupling the Input
In most applications the analog input signal can be directly
coupled to the LTC1405 inputs. If the input signal is
centered around ground, such as when dual supply op
amps are used, simply connect AIN– to ground and con-
nect VSS to – 5V (Figure 4). In a single power supply
system with the input signal centered around 2.5V, con-
nect AIN– to VCM and VSS to ground (Figure 5). If the input
signal is not centered around ground or 2.5V, the voltage
for AIN– must be generated externally by a resistor divider
or a voltage reference (Figure 6).
1405 F07
+AIN
VSS
VIN
1F
0V
C
RR
LTC1405
5V
–AIN
VCM
Figure 7. AC Coupling to the LTC1405. Note That the Input Signal
Can Almost Always Be Directly Coupled with Better Performance
1405 F04
1F
+AIN
VSS
VIN
0V
LTC1405
5V
–5V
–AIN
VCM
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