MAX2037 データシートの表示（PDF） - Maxim Integrated

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MAX2037

Ultrasound Variable-Gain Amplifier

Maxim Integrated 

Ultrasound Variable-Gain Amplifier

Pin Description (continued)

PIN

NAME

FUNCTION

61

VGOUT5-

VGA Channel 5 Inverting Differential Output

62

VG_CTL-

VGA Analog Gain-Control Inverting Input

63

VG_CTL+

VGA Analog Gain-Control Noninverting Input

67

VGOUT4+

VGA Channel 4 Noninverting Differential Output

68

VGOUT4-

VGA Channel 4 Inverting Differential Output

70

VGOUT3+

VGA Channel 3 Noninverting Differential Output

71

VGOUT3-

VGA Channel 3 Inverting Differential Output

74

VGOUT2+

VGA Channel 2 Noninverting Differential Output

75

VGOUT2-

VGA Channel 2 Inverting Differential Output

77

VGOUT1+

VGA Channel 1 Noninverting Differential Output

78

VGOUT1-

VGA Channel 1 Inverting Differential Output

VGA Clamp Mode Enable. Drive VG_CLAMP_MODE low to enable VGA clamping. VGA output

86

VG_CLAMP_MODE will be clamped at typically 2.4VP-P differential. Drive VG_CLAMP_MODE high to disable VGA

clamp mode.

94

VGIN1-

VGA Channel 1 Inverting Differential Input

95

VGIN1+

VGA Channel 1 Noninverting Differential Input

99

VGIN2-

VGA Channel 2 Inverting Differential Input

100

VGIN2+

VGA Channel 2 Noninverting Differential Input

—

EP

Exposed paddle. Solder the exposed paddle to the ground plane using multiple vias.

Detailed Description

The MAX2037’s VGAs are optimized for high linearity,

high dynamic range, and low output noise perfor-

mance, making this component ideal for ultrasound-

imaging applications. The VGA paths also exhibit a

channel-to-channel crosstalk of -80dB at 10MHz and an

absolute gain error of less than ±0.25dB for minimal

channel-to-channel focusing error in an ultrasound sys-

tem. Each VGA path includes circuitry for adjusting

analog gain, an output buffer with differential output

ports (VGOUT_+, VGOUT_-) for driving ADCs, and dif-

ferential input ports (VGIN_+, VGIN_-) that are ideal for

directly interfacing to the MAX2034 quad LNA. See the

Functional Diagram for details.

The VGA has an adjustable gain range from -12.5dB to

+29.5dB, achieving a total dynamic range of typically

42dB. The VGA gain can be adjusted with the differen-

tial gain-control input VG_CTL+ and VG_CTL-. Set the

differential gain-control input voltage at -2V for maxi-

mum gain and +2V for minimum gain. The differential

analog control common-mode voltage is typically 3.0V.

VGA Clamp

A clamp is provided to limit the VGA output signals to

avoid overdriving the ADC or to prevent ADC satura-

tion. Set VG_CLAMP_MODE low to clamp the VGA dif-

ferential outputs at 2.4VP-P. Set the VG_CLAMP_MODE

high to disable the clamp.

Power Down

The device can also be powered down with PD. Set PD

to logic-high for power-down mode. In power-down

mode, the device draws a total supply current of 27mA.

Set PD to a logic-low for normal operation

Overload Recovery

The device is also optimized for quick overload recov-

ery for operation under the large input signal conditions

that are typically found in ultrasound input buffer imag-

ing applications. See the Typical Operating

Characteristics for an illustration of the rapid recovery

time from a transmit-related overload.

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