max2036ccq Maxim Integrated Products, Inc., max2036ccq Datasheet

max2036ccq

Manufacturer Part Number

max2036ccq

Description

Ultrasound Vga Integrated With Cw Octal Mixer

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.MAX2036CCQ.pdf (23 pages)

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The MAX2036 8-channel variable-gain amplifier (VGA)

and programmable octal mixer array is designed for

high linearity, high dynamic range, and low-noise per-

formance targeting ultrasound imaging and Doppler

applications. Each amplifier features differential inputs

and outputs and a total gain range of 50dB (typ). In

addition, the VGAs offer very low output-referred noise

performance suitable for interfacing with 10-bit ADCs.

The MAX2036 VGA is optimized for less than ±0.5dB

absolute gain error to ensure minimal channel-to-channel

ultrasound beamforming focus error. The device’s differ-

ential outputs are designed to directly drive ultrasound

ADCs through an external passive anti-aliasing filter. A

switchable clamp is also provided at each amplifier’s

output to limit the output signals, thereby preventing

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 V

5MHz, and an ultrasound-specific* two-tone third-order

intermodulation distortion specification of -52dBc at

The MAX2036 also integrates an octal quadrature mixer

array and programmable LO phase generators for a

complete CW beamforming solution. The LO phase

selection for each channel can be programmed using a

digital serial interface and a single high-frequency

clock or the LOs for each complex mixer pair can be

directly driven using separate 4 x LO clocks. The serial

interface is designed to allow multiple devices to be

easily daisy-chained in order to minimize program inter-

face wiring. The LO phase dividers can be pro-

grammed to allow 4, 8, or 16 quadrature phases. The

input path of each CW mixer consists of a selectable

lowpass filter for optimal CWD noise performance. The

outputs of the mixers are summed into I and Q differen-

tial current outputs. The mixers and LO generators are

designed to have exceptionally low noise performance

of -155dBc/Hz at 1kHz offset from a 1.25MHz carrier.

The MAX2036 operates from a +5.0V power supply,

consuming only 120mW/channel in VGA mode and

269mW/channel in normal power CW mode. A low-

power CW mode is also available and consumes only

226mW/channel. The device is available in a lead-free

100-pin TQFP package (14mm x 14mm) with an

exposed pad. Electrical performance is guaranteed

over a 0°C to +70°C temperature range.

19-4420; Rev 0; 1/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

OUT

= 1.5V

Ultrasound Imaging

P-P

and f

________________________________________________________________ Maxim Integrated Products

General Description

= 5MHz.

OUT

Sonar

= 1.5V

Applications

P-P

and f

Ultrasound VGA Integrated

♦ 8-Channel Configuration

♦ High Integration for Ultrasound Imaging

♦ Pin Compatible with the MAX2035 Ultrasound

VGA Features

♦ Maximum Gain, Gain Range, and Output-Referred

♦ ±0.5dB Absolute Gain Error

♦ 120mW Consumption per Channel

♦ Switchable Output VGA Clamp Eliminating ADC

♦ Fully Differential VGA Outputs for Direct ADC

♦ Variable Gain Range Achieves 50dB Dynamic

♦ -62dBc HD2 at V

♦ Two-Tone Ultrasound-Specific* IMD3 of -52dBc at

CWD Mixer Features

♦ Low Mixer Noise of -155dBc/Hz at 1kHz Offset

♦ Serial-Programmable LO Phase Generator for 4, 8,

♦ Optional Individual Channel 4 x f

♦ 269mW Power Consumption per Channel (Normal

♦ CWD Implementation Is Fully Compliant with All

+ Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape-and-reel package.

D = Dry packing.

†

* See the Ultrasound-Specific IMD3 Specification in the

Applications Information section.

Pin Configuration appears at end of data sheet.

MAX2036CCQ+D

MAX2036CCQ+TD

EP = Exposed pad.

Applications

VGA

Noise Optimized for Interfacing with 10-Bit ADCs

Overdrive

Drive

Range

from 1.25MHz Carrier

16 LO Quadrature Phase Resolution

Drive Capability

Power Mode) and 226mW Power Consumption

per Channel (Low-Power Mode)

Patents Related to Ultrasound Imaging

Techniques

OUT

Maximum Gain of 39.5dB

Total Gain Range of 50dB

-60nV/ √ √ Hz Ultra-Low Output-Referred Noise at

5MHz

with CW Octal Mixer

PART

= 1.5V

P-P

and f

OUT

TEMP RANGE

Ordering Information

0°C to +70°C

= 1.5V

= 5MHz

P-P

and f

100 TQFP-EP †

PIN-PACKAGE

LO Input

Features

= 5MHz

Related parts for max2036ccq

max2036ccq Summary of contents

Page 1

... Power Mode) and 226mW Power Consumption per Channel (Low-Power Mode) ♦ CWD Implementation Is Fully Compliant with All Patents Related to Ultrasound Imaging Techniques PART MAX2036CCQ+D MAX2036CCQ+TD + Denotes a lead(Pb)-free/RoHS-compliant package Tape-and-reel package Dry packing. † Exposed pad. * See the Ultrasound-Specific IMD3 Specification in the Applications Applications Information section ...

Page 2

Ultrasound VGA Integrated with CW Octal Mixer ABSOLUTE MAXIMUM RATINGS GND .................................................-0.3V to +5.5V CC REF Any Other Pins to GND...............................-0. Mixer Output Voltage to GND (CW_IOUT+, CW_IOUT-, CW_QOUT+, CW_QOUT-) ................................................13V VGA Differential ...

Page 3

DC ELECTRICAL CHARACTERISTICS—CM MIXER MODE (Figure 4.75V to 5.25V REF = CW_VG = 0, CW_M1 = 0, CW_M2 = signals applied, capacitance to GND at each of the ...

Page 4

Ultrasound VGA Integrated with CW Octal Mixer AC ELECTRICAL CHARACTERISTICS—VGA MODE (Figure 4.75V to 5.25V REF TMODE = CW_VG = 1, CW_M1 = 0, CW_M2 = 0, VG_CLAMP_MODE = ...

Page 5

AC ELECTRICAL CHARACTERISTICS—CW MIXER MODE (continued) (Figure 4.75V to 5.25V REF CW_VG = 0, CW_M1 = 0, CW_M2 = 0, VG_CLAMP_MODE = 1, f VGA differential outputs is 60pF, differential ...

Page 6

Ultrasound VGA Integrated with CW Octal Mixer AC ELECTRICAL CHARACTERISTICS—CW MIXER MODE (continued) (Figure 4.75V to 5.25V REF CW_VG = 0, CW_M1 = 0, CW_M2 = 0, VG_CLAMP_MODE = 1, ...

Page 7

4.75V to 5.25V REF VGA differential outputs is 60pF, differential capacitance across the VGA outputs is 10pF, R ues are 5V 3.0V REF ...

Page 8

Ultrasound VGA Integrated with CW Octal Mixer (Figure 4.75V to 5.25V REF VGA differential outputs is 60pF, differential capacitance across the VGA outputs is 10pF, R ues are ...

Page 9

4.75V to 5.25V REF VGA differential outputs is 60pF, differential capacitance across the VGA outputs is 10pF, R ues are 5V 3.0V REF ...

Page 10

Ultrasound VGA Integrated with CW Octal Mixer (Figure 4.75V to 5.25V REF CW_M1 = 0, CW_M2 = 0, CW mixer outputs pulled up to +11V through four separate ±0.1% 115Ω resistors, differential mixer ...

Page 11

PIN NAME 1 CWIN2- CW Mixer Channel 2 Inverting Differential Input 2 CWIN2+ CW Mixer Channel 2 Noninverting Differential Input 3 VGIN3- VGA Channel 3 Inverting Differential Input 4 VGIN3+ VGA Channel 3 Noninverting Differential Input 5, 10, 19, 24, ...

Page 12

Ultrasound VGA Integrated with CW Octal Mixer PIN NAME External Resistor. Connect a 0.1% 7.5k 38 EXT_RES the bias for the internal biasing circuitry. CW Mixer VGA Enable. Selects for VGA or CW mixer operation. Set CW_VG to a logic-high ...

Page 13

PIN NAME 76 LO1 CW LO Input for Channel 1. LO clock input for modes 3 and 4. 77 VGOUT1+ VGA Channel 1 Noninverting Differential Output 78 VGOUT1- VGA Channel 1 Inverting Differential Output 80 DIN Serial Port Data Input. ...

Page 14

Ultrasound VGA Integrated with CW Octal Mixer Detailed Description The MAX2036 is an 8-channel VGA integrated with a programmable octal quadrature mixer array designed for ultrasound imaging and Doppler applications. The device is optimized for efficient power consumption, high dynamic ...

Page 15

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 . Set the VG_CLAMP_MODE high to P-P disable the ...

Page 16

Ultrasound VGA Integrated with CW Octal Mixer CW Mixer Output Summation The outputs from the octal mixer array are summed inter- nally to produce the total CWD summed beamformed signal. The octal array produces eight differential quad- rature (Q) outputs ...

Page 17

The LO_LVDS input frequency operation. The CWD LO frequency range is 1MHz to 7.5MHz, and the input frequency ranges from 8MHz to 60MHz. This high LO clock frequency requires a differ- ential LVDS input. The ...

Page 18

Ultrasound VGA Integrated with CW Octal Mixer CHANNEL DATA_IN CLOCK CHANNEL Figure 1. Data Flow of Serial Shift ...

Page 19

Applications Information Mode Select Response Time The mode select response time is the time that the device takes to switch between CW and VGA modes. One possible approach to interfacing the CW outputs to an instrumentation amplifier used to drive ...

Page 20

Ultrasound VGA Integrated with CW Octal Mixer The serial interface of the MAX2036 programs the LO for 16 quadrature phases using a serial shift register implementation. Data is shifted into the device on DIN. The serial shift ...

Page 21

CW Mixer Output Summation The maximum differential current output is typically 3mA and the mixer output compliance voltage P-P ranges from 4.75V to 12V per mixer channel. The mixer common-mode current in each of the differential mixer outputs is typically ...

Page 22

Ultrasound VGA Integrated with CW Octal Mixer Figure 7. Typical per-Channel Ultrasound Imaging Application 22 ______________________________________________________________________________________ ...

Page 23

... TQFP For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 100 TQFP-EP Maxim is a registered trademark of Maxim Integrated Products, Inc. Pin Configuration VGOUT8 VGOUT8+ LO8 ...

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