參數(shù)資料
型號(hào): LTC1403IMSE
廠商: LINEAR TECHNOLOGY CORP
元件分類: ADC
英文描述: MB 61C 61#20 PIN PLUG
中文描述: 1-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO10
封裝: PLASTIC, MSOP-10
文件頁(yè)數(shù): 11/20頁(yè)
文件大?。?/td> 323K
代理商: LTC1403IMSE
11
LTC1403/LTC1403A
1403af
INPUT SPAN VERSUS REFERENCE VOLTAGE
The differential input range has a unipolar voltage span
that equals the difference between the voltage at the
reference buffer output V
REF
at Pin 3, and the voltage at the
ground (Exposed Pad Ground). The differential input
range of the ADC is 0V to 2.5V when using the internal
reference. The internal ADC is referenced to these two
nodes. This relationship also holds true with an external
reference.
DIFFERENTIAL INPUTS
The LTC1403/LTC1403A has a unique differential sample-
and-hold circuit that allows inputs from ground to V
DD
.
The ADC will always convert the unipolar difference of
A
IN+
– A
IN–
, independent of the common mode voltage at
the inputs. The common mode rejection holds up at
extremely high frequencies, see Figure 3. The only require-
ment is that both inputs not go below ground or exceed
V
DD
. Integral nonlinearity errors (INL) and differential
nonlinearity errors (DNL) are largely independent of the
common mode voltage. However, the offset error will
vary. The change in offset error is typically less than 0.1%
of the common mode voltage.
Figure 4 shows the ideal input/output characteristics for
the LTC1403/LTC1403A. The code transitions occur mid-
way between successive integer LSB values (i.e., 0.5LSB,
1.5LSB, 2.5LSB, FS – 1.5LSB). The output code is natural
binary with 1LSB = 2.5V/16384 = 153
μ
V for the LTC1403A,
and 1LSB = 2.5V/4096 = 610
μ
V for the LTC1403. The
LTC1403A has 1LSB RMS of random white noise.
Figure 3
Figure 4
APPLICATIU
W
U
U
LTC1403/LTC1403A Transfer
Characteristic
CMRR vs Frequency
FREQUENCY (Hz)
100
C
0
–20
–40
–60
–80
–100
–120
1k
10k
100k
1M
1403A F03
10M
100M
INPUT VOLTAGE (V)
1403A F05
111...111
111...110
111...101
000...000
000...001
000...010
FS – 1LSB
0
相關(guān)PDF資料
PDF描述
LTC1403CMSE Serial 12-Bit/14-Bit, 2.8Msps Sampling ADCs with Shutdown
LTC1403 Serial 12-Bit/14-Bit, 2.8Msps Sampling ADCs with Shutdown
LTC1403A Serial 12-Bit/14-Bit, 2.8Msps Sampling ADCs with Shutdown
LTC1403AIMSE Serial 12-Bit/14-Bit, 2.8Msps Sampling ADCs with Shutdown
LTC1404IS8 Complete SO-8, 12-Bit, 600ksps ADC with Shutdown
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