參數(shù)資料
型號(hào)： MAX1403EAI+T
廠商： Maxim Integrated Products
文件頁數(shù)： 17/36頁
文件大?。?/td> 0K
描述： IC ADC 18BIT LP 28-SSOP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,000
位數(shù)： 18
采樣率（每秒）： 480
數(shù)據(jù)接口： QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 21.45mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 28-SSOP（0.209"，5.30mm 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： 3 個(gè)差分，單極；3 個(gè)差分，雙極；5 個(gè)偽差分，單極；5 個(gè)偽差分，雙極
MAX1403
+3V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
24
______________________________________________________________________________________
Table 13c. REXT, CEXT Values for Less than 16-Bit Gain Error in Unbuffered (BUFF = 0)
Mode—4x Modulator Sampling Frequency (MF1, MF0 = 10 ); X2CLK = 0; CLKIN =
2.4576MHz
Table 13d. REXT, CEXT Values for Less than 16-Bit Gain Error in Unbuffered (BUFF = 0)
Mode—8x Modulator Sampling Frequency (MF1, MF0 = 11); X2CLK = 0; CLKIN =
2.4576MHz
REXT
CEXT
RMUX
CPIN
RIN
CST
CAMP
CSAMPLE
CC
Figure 6. Analog Input, Buffered Mode (BUFF = 1)
8.3
3.7
8.3
3.7
2.4
2
6.2
3.2
4.1
2.5
1.8
8, 16, 32,
64, 128
2.2
2.4
4
1
CEXT = 0pF
CEXT = 50pF
CEXT = 100pF
0.72
0.40
0.72
0.40
0.11
0.67
0.38
0.60
0.35
0.09
0.10
PGA GAIN
0.11
CEXT = 500pF
CEXT = 1000pF
CEXT = 5000pF
EXTERNAL RESISTANCE, REXT (k
)
4.1
1.8
4.1
1.8
1.2
2
3.0
1.5
2.0
1.2
0.88
8, 16, 32,
64, 128
1.1
1.2
4
1
CEXT = 0pF
CEXT = 50pF
CEXT = 100pF
0.35
0.20
0.35
0.20
0.05
0.32
0.18
0.29
0.17
0.04
0.05
PGA GAIN
0.05
CEXT = 500pF
CEXT = 1000pF
CEXT = 5000pF
EXTERNAL RESISTANCE, REXT (k
)
Input Buffers
The MAX1403 provides a pair of input buffers to isolate
the inputs from the capacitive load presented by the
PGA/modulator (Figure 6). The buffers are chopper sta-
bilized to reduce the effect of their DC offsets and low-
frequency noise. Since the buffers can represent more
than 50% of the total analog power dissipation, they may
be shut down in applications where minimum power dis-
sipation is required and the capacitive input load is not a
concern. Disable the buffers in applications where the
inputs must operate close to AGND or V+.
When used in buffered mode, the buffers isolate the
inputs from the sampling capacitors. The sampling-
related gain error is dramatically reduced in this mode.
A small dynamic load remains from the chopper stabi-
lization. The multiplexer exhibits a small input leakage
current of up to 10nA. With high source resistances,
this leakage current may result in a DC offset.
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