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What is MAX2035?

This electronic component, produced by the manufacturer "Maxim Integrated Products", performs the same function as "Ultrasound Variable Gain Amplifier".


MAX2035 Datasheet PDF - Maxim Integrated Products

Part Number MAX2035
Description Ultrasound Variable Gain Amplifier
Manufacturers Maxim Integrated Products 
Logo Maxim Integrated Products Logo 


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19-0630; Rev 0; 10/06
Ultrasound Variable-Gain Amplifier
General Description
The MAX2035 8-channel variable-gain amplifier (VGA)
is designed for high linearity, high dynamic range, and
low-noise performance targeting ultrasound imaging
and Doppler applications. Each amplifier features dif-
ferential inputs and outputs and a total gain range of
typically 50dB. In addition, the VGAs offer very low out-
put-referred noise performance suitable for interfacing
with 10-bit ADCs.
The MAX2035 VGA is optimized for less than ±0.5dB
absolute gain error to ensure minimal channel-to-chan-
nel ultrasound beamforming focus error. The device’s
differential outputs are designed to directly drive ultra-
sound ADCs through an external passive anti-aliasing
filter. A switchable clamp is also provided at each ampli-
fier’s outputs to limit the output signals, thereby prevent-
ing ADC overdrive or saturation.
Dynamic performance of the device is optimized to
reduce distortion to support second-harmonic imaging.
The device achieves a second-harmonic distortion
specification of -62dBc at VOUT = 1.5VP-P and fIN =
5MHz, and an ultrasound-specific* two-tone third-order
intermodulation distortion specification of -52dBc at
VOUT = 1.5VP-P and fIN = 5MHz.
The MAX2035 operates from a +5.0V power supply,
consuming only 127mW/channel. The device is avail-
able in a 100-pin TQFP package with an exposed paddle.
Electrical performance is guaranteed over a 0°C to
+70°C temperature range.
Applications
Ultrasound Imaging
Sonar
Features
o 8-Channel Configuration
o High Integration for Ultrasound Imaging
Applications
o Pin Compatible with the MAX2036 Ultrasound
VGA Plus CW Doppler Beamformer
o Maximum Gain, Gain Range, and Output-Referred
Noise Optimized for Interfacing with 10-Bit ADCs
Maximum Gain of 39.5dB
Total Gain Range of 50dB
60nV/Hz Ultra-Low Output-Referred Noise at
5MHz
Pin-for-Pin 12-Bit Compatibility Supported By
MAX2037/MAX2038
o ±0.5dB Absolute Gain Error
o Switchable Output VGA Clamp Eliminating ADC
Overdrive
o Fully Differential VGA Outputs for Direct ADC
Drive
o Variable Gain Range Achieves 50dB Dynamic
Range
o -62dBc HD2 at VOUT = 1.5VP-P and fIN = 5MHz
o Two-Tone Ultrasound-Specific* IMD3 of -52dBc at
VOUT = 1.5VP-P and fIN = 5MHz
o 127mW Consumption per Channel
*See the Ultrasound-Specific IMD3 Specification in the
Applications Information section.
Functional Diagram
VCC VREF
VG_CTL+
VG_CTL-
VG_IN1+
VG_IN1-
VG_IN8+
VG_IN8-
PD
MAX2035
-10.5dB TO +39.5dB
VGA 50
VGA
••
••
••
50
50
50
BIAS
CIRCUITRY
VG_CLAMP_MODE
VG_OUT1+
VG_OUT1-
VG_OUT8+
VG_OUT8-
GND EXT_RES
Ordering Information
PART
TEMP
RANGE
PIN-PACKAGE PKG
CODE
MAX2035CCQ-D
0°C to +70°C
100 TQFP-EP
(14mm x 14mm)
C100E-3
MAX2035CCQ-TD
0°C to +70°C
100 TQFP-EP
(14mm x 14mm)
C100E-3
MAX2035CCQ+D
0°C to +70°C
100 TQFP-EP
(14mm x 14mm)
C100E-3
MAX2035CCQ+TD
0°C to +70°C
100 TQFP-EP
(14mm x 14mm)
C100E-3
EP = Exposed paddle.
+Denotes lead-free package.
T = Tape-and-reel package.
D = Dry packing.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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MAX2035 equivalent
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Ultrasound Variable-Gain Amplifier
Typical Operating Characteristics (continued)
(Figure 2, VCC = VREF = 4.75V to 5.25V, GND = 0V, PD = 0, VG_CLAMP_MODE = 1, fRF = 5MHz, capacitance to GND at each of the
VGA differential outputs is 60pF, differential capacitance across the VGA outputs is 10pF, RL = 1k, TA = 0°C to +70°C. Typical val-
ues are at VCC = VREF = 5V, VCM = 3.0V, TA = +25°C, unless otherwise noted.)
SECOND-HARMONIC DISTORTION
vs. GAIN
0
-10 VOUT = 1VP-P DIFFERENTIAL
-20
-30
-40 f = 12MHz
-50 f = 5MHz
-60
-70
-80 f = 2MHz
-90
-100
-15 -5 5 15 25 35 45
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-15
THIRD-HARMONIC DISTORTION
vs. GAIN
VOUT = 1VP-P DIFFERENTIAL
f = 12MHz
f = 5MHz
f = 2MHz
-5 5 15 25 35
45
GAIN (dB)
GAIN (dB)
OVERLOAD RECOVERY TIME
MAX2035 toc06
f = 5MHz DIFFERENTIAL
INPUT
200mV/div
OVERLOAD RECOVERY TIME
MAX2035 toc07
f = 5MHz DIFFERENTIAL
INPUT
200mV/div
DIFFERENTIAL
OUTPUT
500mV/div
DIFFERENTIAL
OUTPUT
500mV/div
OUTPUT OVERLOAD TO 1VP-P
OUTPUT OVERLOAD TO 100mVP-P
CHANNEL-TO-CHANNEL CROSSTALK
vs. GAIN
-60
VOUT = 1.5VP-P DIFFERENTIAL
-65 f = 10MHz, ADJACENT CHANNELS
-70
-75
CHANNEL-TO-CHANNEL CROSSTALK
vs. FREQUENCY
-30
VOUT = 1VP-P DIFFERENTIAL
-40 GAIN = 20dB, ADJACENT CHANNELS
-50
-60
-80 -70
-85 -80
-90 -90
-95 -100
-100
-15 -5
5 15 25 35 45
GAIN (dB)
-110
1
10
FREQUENCY (MHz)
100
_______________________________________________________________________________________ 5


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1. - Ultrasound Variable Gain Amplifier

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