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參數(shù)資料
| 型號： | MAX2078CTK+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 11/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC FRNT-END ULTRASOUND 8CH 68QFN |
| 應用說明： | Ultrasound Imaging Systems Application Note |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 特色產(chǎn)品： | MAX2078 Octal-Channel Ultrasound Front-End with CW Doppler Mixers |
| 標準包裝： | 30 |
| 類型： | 超聲波接收器 |
| 應用： | 醫(yī)療用超聲波成像，聲納 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 68-TQFN 裸露焊盤 |
| 供應商設備封裝： | 68-TQFN-EP（10x10） |
| 包裝： | 管件 |
MAX2078
Octal-Channel Ultrasound Front-End
with CW Doppler Mixers
______________________________________________________________________________________
19
VGA and CW Mixer Operation
During normal operation, the MAX2078 is configured so
that either the VGA path is enabled while the mixer
array is powered down (VGA mode), or the quadrature
mixer array is enabled while the VGA path is powered
down (CW mode). For VGA mode, set V/C to a logic-
high and for CW mode, set V/C to a logic-low.
Power-Down and Low-Power Mode
The MAX2078 can also be powered down with PD. Set
PD to VCC1 for power-down mode. In power-down
mode, the device draws a total supply current less than
1A. Set PD to logic-low for normal operation.
A low-power mode is available to lower the required
power for CWD operation. When selected, the complex
mixers operate at lower quiescent currents and the total
per-channel current is lowered to 34.2mA. Note that
operation in this mode slightly reduces the dynamic
performance of the device. Table 4 shows the logic
function of the standard operating modes.
Applications Information
Mode Select Response Time
The mode select response time is the time that the
device takes to switch between CW and VGA modes.
Figure 2 depicts one possible approach to interfacing
the CW outputs to an instrumentation amplifier, which is
used to drive an ADC. In this implementation, there are
four large-value (in the range of 470nF to 1F) capaci-
tors between each of the CQ+, CQ-, CI+, CI- outputs
and the circuitry they are driving. The output of the CW
mixer usually drives the input of an instrumentation
amplifier made up of op amps whose input impedance
is set by common-mode setting resistors.
There are clearly both a highpass corner and a lowpass
corner present in this output network. The lowpass cor-
ner is set primarily by the 162
Ω mixer pullup resistors,
the series 50
Ω resistors, and the shunt 0.022F capaci-
tor. This lowpass corner is used to filter a combination
of LO leakage and upper sideband. The highpass cor-
ner, however, is of a larger concern since it is dominat-
ed by the combination of a 1F DC-blocking capacitor
and the pair of shunt 31.6k
Ω resistors.
PD
INPUT
V/C
CLP
VGA
CW
MIXER
INTERNAL
SWITCH
TO VGA
INTERNAL
SWITCH
TO CW
MIXER
3.3V VCC
CURRENT
CONSUMPTION
5V VCC
CURRENT
CONSUMPTION
11V VMIX
CURRENT
CONSUMPTION
1
N/A
Off
0.3A
0.4A
0
1
0
N/A
Off
0.1A
0.6A
0
Off
On
Off
On
3.2mA
248mA
90.4mA
0
1
Off
On
Off
On
3.2mA
216mA
54.4mA
0
1
N/A
On
Off
On
Off
88mA
48mA
0
Table 4. Logic Function of Standard Operating Modes
N/A = Not applicable.
162
Ω
CI-
CI+
162
Ω
1
μF
1
μF
0.022
μF
31.6k
Ω
31.6k
Ω
50
Ω
Figure 2. Typical Example of a CW Mixer’s Output Circuit
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX2078CTK+ | 功能描述:射頻前端 8Ch Ultrasound Front-End RoHS:否 制造商:Skyworks Solutions, Inc. 類型: 工作頻率:2.4 GHz, 5 GHz 最大數(shù)據(jù)速率:54 Mbps 噪聲系數(shù): 工作電源電壓:3.3 V 電源電流:180 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-32 |
| MAX2078CTK+T | 功能描述:射頻前端 8Ch Ultrasound Front-End RoHS:否 制造商:Skyworks Solutions, Inc. 類型: 工作頻率:2.4 GHz, 5 GHz 最大數(shù)據(jù)速率:54 Mbps 噪聲系數(shù): 工作電源電壓:3.3 V 電源電流:180 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-32 |
| MAX2078EVKIT | 功能描述:射頻前端 Ultrasound Integrated Analog Front End Octal LNA RoHS:否 制造商:Skyworks Solutions, Inc. 類型: 工作頻率:2.4 GHz, 5 GHz 最大數(shù)據(jù)速率:54 Mbps 噪聲系數(shù): 工作電源電壓:3.3 V 電源電流:180 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-32 |
| MAX2079 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:每個通道具有獨立的混頻器，以優(yōu)化CWD靈敏度 |
| MAX2079CXE+ | 功能描述:射頻接收器 8Ch Ultrasound Front End w/ADC+CW Doppler RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
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