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| 型号： | MAX2077CTK+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC FRONT-END ULTRASOUND 68TQFN |
| 应用说明： | Ultrasound Imaging Systems Application Note |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 30 |
| 类型： | 超声波接收器 |
| 应用： | 医疗用超声波成像，声纳 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 68-TQFN 裸露焊盘 |
| 供应商设备封装： | 68-TQFN-EP（10x10） |
| 包装： | 管件 |
MAX2077
Octal-Channel Ultrasound Front-End
14
______________________________________________________________________________________
Consequently, the switches that control the feedback
resistance (RF) have to be changed. For instance, the
100
Ω mode in high gain becomes the 200Ω mode in
low gain (see Table 2).
Variable-Gain Amplifier (VGA)
The MAX2077’s VGAs are optimized for high linearity,
high dynamic range, and low output-noise perfor-
mance, all of which are critical parameters for ultra-
sound imaging applications. Each VGA path includes
circuitry for adjusting analog gain, as well as an output
buffer with differential output ports (OUT_+, OUT_-) for
driving ADCs.
The VGA gain can be adjusted through the differential
gain control input VG+ and VG-. Set the differential gain
control input voltage at -3V for minimum gain and +3V
for maximum gain. The differential analog control com-
mon-mode voltage is 1.65V (typ).
Overload Recovery
The device is also optimized for quick overload recovery
for operation under the large input signal conditions that
are typically found in ultrasound imaging applications. See
the
Typical Operating Characteristics for an illustration of
the rapid recovery time from a transmit-related overload.
Power-Down Mode
The MAX2077CTN+ can also be powered down with PD
(the same feature is not available in the MAX2077CTK+).
Set PD to logic-high for power-down mode. In power-
down mode, the device consumes 3.0W (typ) power.
Set PD to logic-low for normal operation.
Setting NP to logic-high places the MAX2077 in stand-
by mode. In standby mode, the device consumes less
power (5.6mW typ), but input/output pins remain biased
to provide quick power-up response time. Standby
mode is available for both MAX2077CTN+ and
MAX2077CTK+ versions.
Applications Information
Serial Interface
The MAX2077 is programmed using a serial shift regis-
ter arrangement. This greatly simplifies the complexity
of the program circuitry, reduces the number of IC pins
necessary for programming, and reduces the PCB lay-
out complexity. The data in (DIN) and data out (DOUT)
can be daisy-chained from device to device and all
front-ends can run off a single programming clock.
The data can be entered after CS goes low. Once a
whole word is entered, CS needs to rise. When pro-
gramming the part, enter LSB first and MSB last. The
chip-select line (CS) is used to load the programming
information in multiple MAX2077 devices at the same
time. The line is pulled down before the programming
begins and pulled up after it is complete for all devices
used. On the rising edge, the information is stored in
internal registers.
Active Impedance Matching
To provide exceptional noise-figure characteristics, the
input impedance of each amplifier uses a feedback
topology for active impedance matching. A feedback
resistor of the value (1 + (A/2)) x RS is added between
the inverting input of the amplifier to the output. The
input impedance is the feedback resistor (ZF) divided
by 1 + (A/2). The factor of two is due to the gain of the
amplifier (A) being defined with a differential output. For
common input impedances, the internal digitally pro-
grammed impedances can be used (see Table 2). For
other input impedances, use an externally supplied
resistor in series with the existing programmable feed-
back impedances to set the input impedance accord-
ing to the above formula.
Noise Figure
The MAX2077 is designed to provide maximum input sen-
sitivity with exceptionally low noise figure. The input active
devices are selected for very low-equivalent input-noise
voltage and current, optimized for source impedances
from 50
Ω to 1000Ω. Additionally, the noise contribution of
the matching resistor is effectively divided by 1 + (A/2).
Using this scheme, typical noise figure of the amplifier is
approximately 2.4dB for RIN = RS = 200
Ω. Table 3 illus-
trates the noise figure for other input impedances.
Input Clamp
The MAX2077 includes configurable integrated input-
clamping diodes. The diodes are clamped to ground at
±0.8V. The input-clamping diodes can be used to pre-
vent large transmit signals from overdriving the inputs of
the amplifiers. Overdriving the inputs could possibly
place charge on the input-coupling capacitor, causing
longer transmit overload recovery times. Input signals
are AC-coupled to the single-ended inputs IN1–IN8, but
are clamped with the INC1–INC8 inputs. See the
Typical
Application Circuits. If external clamping devices are
preferred, simply leave INC1–INC8 unconnected.
RS ( )RIN ( )NF (dB)
50
4.5
100
3.4
200
2.4
1000
2.2
Table 3. Noise Figure vs. Source and
Input Impedances
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX2077CTK+ | 功能描述:射频前端 8Ch Ultrasound Front-End RoHS:否 制造商:Skyworks Solutions, Inc. 类型: 工作频率:2.4 GHz, 5 GHz 最大数据速率:54 Mbps 噪声系数: 工作电源电压:3.3 V 电源电流:180 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-32 |
| MAX2077CTK+T | 功能描述:射频前端 8Ch Ultrasound Front-End RoHS:否 制造商:Skyworks Solutions, Inc. 类型: 工作频率:2.4 GHz, 5 GHz 最大数据速率:54 Mbps 噪声系数: 工作电源电压:3.3 V 电源电流:180 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-32 |
| MAX2077CTN+ | 功能描述:射频前端 8Ch Ultrasound Front-End RoHS:否 制造商:Skyworks Solutions, Inc. 类型: 工作频率:2.4 GHz, 5 GHz 最大数据速率:54 Mbps 噪声系数: 工作电源电压:3.3 V 电源电流:180 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-32 |
| MAX2077CTN+T | 功能描述:射频前端 8Ch Ultrasound Front-End RoHS:否 制造商:Skyworks Solutions, Inc. 类型: 工作频率:2.4 GHz, 5 GHz 最大数据速率:54 Mbps 噪声系数: 工作电源电压:3.3 V 电源电流:180 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-32 |
| MAX2077EVKIT# | 功能描述:射频前端 Octal-Channel Ultrasound Front-End RoHS:否 制造商:Skyworks Solutions, Inc. 类型: 工作频率:2.4 GHz, 5 GHz 最大数据速率:54 Mbps 噪声系数: 工作电源电压:3.3 V 电源电流:180 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-32 |
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