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MAX2034CTM+T Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX2034CTM+T Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 13 page Detailed Description The MAX2034 is a four-channel, ultra-low-noise pream- plifier. Each amplifier features single-ended inputs, dif- ferential outputs, and provides an accurate fixed gain of 19dB with a wide -3dB bandwidth of 70MHz. The high- gain accuracy of the amplifier allows for exceptional channel-to-channel gain matching, which is necessary for high-performance ultrasound-imaging applications. The device has an exceptionally low noise figure, making it ideal for use in ultrasound front-end designs. Noise fig- ure is typically 2.2dB for a source impedance and pro- grammed input impedance of 200Ω. The MAX2034 is optimized for excellent dynamic range and linearity performance characteristics, making it ideal for ultrasound-imaging modalities including second har- monic 2D imaging and continuous wave Doppler. The device achieves an HD2 of -68dBc at VOUT = 1VP-P and fIN_ = 5MHz, and an ultrasound-specific two-tone IMD3 performance of -55dBc at VOUT = 1VP-P and fIN_ = 5MHz. See the Ultrasound-Specific IMD3 Specification in the Applications Information section. 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 output of the amplifier to the input. 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 1). For other input impedances, program the impedance for external resistor operation, and then use an externally supplied resistor to set the input impedance according to the above formula. The gain and input impedance of the MAX2034 vs. fre- quency are shown in the Typical Operating Char- acteristics. Both gain and input impedance are well behaved, with no peaking characteristics. This allows the device to be used with a variety of input networks, with no requirement for series ferrite beads or shunt capacitors for stability control. Quad-Channel, Ultra-Low-Noise Amplifier with Digitally Programmable Input Impedance _______________________________________________________________________________________ 7 Pin Description (continued) PIN NAME FUNCTION 18, 19, 42 D1, D0, D2 Digitally Programmable Inputs. Programs the input impedance of each amplifier. See Table 1 on input impedance programming information. 23 OUT4- Channel 4 LNA Analog Inverting Output 24 OUT4+ Channel 4 LNA Analog Noninverting Output 28 OUT3- Channel 3 LNA Analog Inverting Output 29 OUT3+ Channel 3 LNA Analog Noninverting Output 31 OUT2- Channel 2 LNA Analog Inverting Output 32 OUT2+ Channel 2 LNA Analog Noninverting Output 35 OUT1- Channel 1 LNA Analog Inverting Output 36 OUT1+ Channel 1 LNA Analog Noninverting Output 43 PD Power-Down. Drive PD high to put the device in sleep mode. Drive PD low for normal mode. 47 ZF1 Channel 1 Active Impedance-Matching Port. AC-couple to the source circuit with a capacitor. 48 IN1 Channel 1 LNA Analog Input. Single-ended input for channel 1 amplifier. Connect the analog input to the source circuit through a series capacitor. EP GND Exposed Paddle. Solder the exposed paddle to the ground plane using multiple vias. D2 D1 D0 RIN ( Ω) 000 50 001 100 010 200 011 1k 100 101 110 111 Defined by external resistor Table 1. Digitally Programmable Input Impedance |
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