- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄2085 > MAX1148BCUP+ (Maxim Integrated Products)IC ADC 14BIT 116KSPS 20-TSSOP PDF資料下載
參數(shù)資料
| 型號： | MAX1148BCUP+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 4/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 116KSPS 20-TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 74 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 116k |
| 數(shù)據(jù)接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 879mW |
| 電壓電源： | 單電源 |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-TSSOP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 8 個單端，單極；8 個單端，雙極；4 個差分，單極；4 個差分，雙極 |
MAX1146–MAX1149
Multichannel, True-Differential,
Serial, 14-Bit ADCs
12
______________________________________________________________________________________
Detailed Description
The MAX1146–MAX1149 ADCs use a successive-
approximation conversion technique and input T/H cir-
cuitry to convert an analog signal to a 14-bit digital
output. A flexible serial interface provides easy inter-
face to microprocessors (Ps). Figure 4 shows the typi-
cal application circuit and Figure 5 shows a functional
diagram of the MAX1148/MAX1149.
True-Differential Analog Input and
Track/Hold
The MAX1146–MAX1149 analog input architecture con-
tains an analog input multiplexer (MUX), two T/H
capacitors, T/H switches, a comparator, and two
switched capacitor digital-to-analog converters (DACs)
(Figure 6).
In single-ended mode, the analog input MUX connects
IN+ to the selected input channel and IN- to COM. In
differential mode, IN+ and IN- are connected to the
selected analog input pairs such as CH0/CH1. Select
the analog input channels according to Tables 1–5.
The analog input multiplexer switches to the selected
channel on the control byte’s fifth SCLK falling edge. At
this time, the T/H switches are in the track position and
CT/H+ and CT/H- track the analog input signal. At the
control byte’s eighth SCLK falling edge, the MUX opens
and the T/H switches move to the hold position, retain-
ing the charge on CT/H+ and CT/H- as a sample of the
input signal. See Figures 8–11 for input MUX and T/H
switch positioning.
During the conversion interval, the switched capacitive
DAC adjusts to restore the comparator-input voltage to
0 within the limits of 14-bit resolution. This action
requires 15 conversion clock cycles and is equivalent
to transferring a charge of 18pF
× (VIN+ - VIN-) from
CT/H+ and CT/H- to the binary-weighted capacitive
DAC, forming a digital representation of the analog
input signal.
After conversion, the T/H switches move from the hold
position to the track position and the MUX switches
back to the last specified position. In internal clock
mode, the conversion is complete on the rising edge of
SSTRB. In external clock mode, the conversion is com-
plete on the eighteenth SCLK falling edge.
The time required for the T/H to acquire an input signal
is a function of the analog input source impedance. If
the input signal source impedance is high, the acquisi-
tion time lengthens. The MAX1146–MAX1149 provide
three SCLK cycles (tACQ) in which the T/H capacitance
must acquire a charge representing the input signal,
typically the last three SCLKs of the control word. The
input source impedance (RSOURCE) should be mini-
mized to allow the T/H capacitance to charge within
this allotted time.
tACQ = 11.5
× (RSOURCE + RIN) × CIN
where RSOURCE is the analog input source impedance,
RIN is 2.6k
(which is the sum of the analog input MUX
and T/H switch resistances), and CIN is 18pF (which is
the sum of CT/H+, CT/H-, and input stray capacitance).
To minimize sampling errors with higher source imped-
ances, connect a 100pF capacitor from the analog
input to AGND. This input capacitor reduces the input’s
AC impedance but forms an RC filter with the source
impedance, limiting the analog input bandwidth. For
larger source impedance, use a buffer amplifier such as
the MAX4430 to maintain analog input signal integrity.
MAX1148
MAX1149
SCLK
DIN
DOUT
SSTRB
VDD
VSS
REFADJ
COM
ANALOG
INPUTS
CH4
CH5
CH6
CH7
CH0
CH1
CH2
CH3
REF
AGND
DGND
0.01
F
0.1
F4.7F
2.2
F
P
I/O
SCK
MOSI
MISO
10
SHDN
CS
Figure 4. Typical Application Circuit
MAX1149
ANALOG
INPUT
MUX
CONTROL
LOGIC
INTERNAL
CLOCK
INPUT
SHIFT
REGISTER
OUTPUT
SHIFT
REGISTER
+1.250V
BANDGAP
REFERENCE
T/H
DOUT
SSTRB
VDD
AGND
SCLK
DIN
COM
REFADJ
REF
CH6
CH7
CH4
CH5
CH1
CH2
CH3
CH0
DGND
SAR
ADC
REF
CLOCK
IN
OUT
20k
AV = 2.0V/V
CS
SHDN
Figure 5. Functional Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX11500USA+T | IC HD VIDEO FILTER 3CH 8-SOIC |
| MAX11501USA+T | IC STD VIDEO FILTER 3CH 8-SOIC |
| MAX11503EUA+T | IC VIDEO Y/C SUMMER W/DVR 8-MSOP |
| MAX11505CUB+T | IC STD VIDEO FILTER 4CH 10UMAX |
| MAX11507CEE+T | IC FILTER VIDEO HD/SD 16-QSOP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1148BCUP+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-Bit 8Ch 116ksps 5V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1148BCUP+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-Bit 8Ch 116ksps 5V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1148BCUP-T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1148BEUP | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1148BEUP+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14-Bit 8Ch 116ksps 5V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。