MAX2035EVKIT Maxim Integrated Products, MAX2035EVKIT Datasheet - Page 9

• Manufacturer Part Number: MAX2035EVKIT
• Description: EVAL KIT FOR MAX2035
• Manufacturer: Maxim Integrated Products
• Type: Amplifierr

Specifications of MAX2035EVKIT

• For Use With/related Products: MAX2035
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX2035’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 ±0.5dB 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 -10.5dB to
+39.5dB, achieving a total dynamic range of typically
50dB. 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.
100
PIN
61
62
63
67
68
70
71
74
75
77
78
86
94
95
99
—
V G_C LAMP _M OD E
_______________________________________________________________________________________
VGOUT4+
VGOUT3+
VGOUT2+
VGOUT1+
VG_CTL+
VGOUT5-
VGOUT4-
VGOUT3-
VGOUT2-
VGOUT1-
VG_CTL-
VGIN1+
VGIN2+
VGIN1-
VGIN2-
NAME
Detailed Description
EP
Ultrasound Variable-Gain Amplifier
VGA Channel 5 Inverting Differential Output
VGA Analog Gain-Control Inverting Input
VGA Analog Gain-Control Noninverting Input
VGA Channel 4 Noninverting Differential Output
VGA Channel 4 Inverting Differential Output
VGA Channel 3 Noninverting Differential Output
VGA Channel 3 Inverting Differential Output
VGA Channel 2 Noninverting Differential Output
VGA Channel 2 Inverting Differential Output
VGA Channel 1 Noninverting Differential Output
VGA Channel 1 Inverting Differential Output
V GA C l am p M od e E nab l e. D r i ve V G _C LAM P _M OD E l ow to enab l e V GA cl am p i ng . V G A outp ut
w i l l b e cl am p ed at typ i cal l y 2.2V
cl am p m od e.
VGA Channel 1 Inverting Differential Input
VGA Channel 1 Noninverting Differential Input
VGA Channel 2 Inverting Differential Input
VGA Channel 2 Noninverting Differential Input
Exposed Pad. Internally connected to GND. Solder the exposed pad to the ground plane
using multiple vias.
A clamp is provided to limit the VGA output signals to
avoid overdriving the ADC or to prevent ADC saturation.
Set VG_CLAMP_MODE low to clamp the VGA differential
outputs at 2.2V
disable the clamp.
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
The device is also optimized for quick overload recovery
for operation under the large input signal conditions that
are typically found in ultrasound input buffer imaging
applications. See the Typical Operating Characteristics
for an illustration of the rapid recovery time from a trans-
mit-related overload.
P - P
d i ffer enti al . D r i ve V G_C LAM P _M O D E hi g h to d i sab l e V G A
FUNCTION
Pin Description (continued)
P-P
. Set the VG_CLAMP_MODE high to
Overload Recovery
Power Down
VGA Clamp
9