MAX2038CCQ+ Maxim Integrated Products, MAX2038CCQ+ Datasheet

IC VGA W/OCTAL MIXER 8CH 100TQFP

MAX2038CCQ+

Manufacturer Part Number
MAX2038CCQ+
Description
IC VGA W/OCTAL MIXER 8CH 100TQFP
Manufacturer
Maxim Integrated Products
Type
Variable Gain Amplifierr
Datasheet

Specifications of MAX2038CCQ+

Applications
Medical Ultrasound Imaging, Sonar
Mounting Type
Surface Mount
Package / Case
100-TQFP Exposed Pad, 100-eTQFP, 100-HTQFP, 100-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX2038 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 42dB (typ). In
addition, the VGAs offer very low output-referred noise
performance suitable for interfacing with 12-bit ADCs.
The MAX2038 VGA is optimized for less than ±0.25dB
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
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 -70dBc at V
5MHz and an ultrasound-specific*, two-tone, third-order
intermodulation distortion specification of -52dBc at
V
The MAX2038 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 to minimize program interface wiring. The LO
phase dividers can be programmed 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 differential current outputs. The
mixers and LO generators are designed to have excep-
tionally low noise performance of -155dBc/Hz at 1kHz
offset from a 1.25MHz carrier.
The MAX2038 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 x 1mm) with an
exposed pad. Electrical performance is guaranteed
over a 0°C to +70°C temperature range.
19-4375; Rev 1; 5/10
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
IN
= 5MHz.
General Description
OUT
Sonar
= 1.5V
Applications
P-P
and f
Ultrasound VGA Integrated
IN
=
o 8-Channel Configuration
o High Integration for Ultrasound Imaging
o Pin Compatible with the MAX2037 Ultrasound VGA
VGA Features
o Maximum Gain, Gain Range, and Output-Referred
o ±0.25dB Absolute Gain Error
o 120mW Consumption per Channel
o Switchable Output VGA Clamp Eliminating ADC
o Fully Differential VGA Outputs for Direct ADC
o Variable Gain Range Achieves 42dB Dynamic
o -70dBc HD2 at V
o Two-Tone Ultrasound-Specific* IMD3 of
CW Doppler Mixer Features
o Low Mixer Noise of -155dBc/Hz at 1kHz Offset
o Serial-Programmable LO Phase Generator for 4, 8,
o Optional Individual Channel 4 x f
o 269mW Power Consumption per Channel (Normal
+ Denotes a lead(Pb)-free/RoHS-compliant package.
D = Dry packing.
T = Tape and reel.
* EP = Exposed pad.
* See the Ultrasound-Specific IMD3 Specification in the
Applications Information section.
Pin Configuration appears at end of data sheet.
MAX2038CCQ+D
MAX2038CCQ+TD
Applications
Noise Optimized for Interfacing with 12-Bit ADCs
Overdrive
Drive
Range
-52dBc at V
from 1.25MHz Carrier
16 LO Quadrature Phase Resolution
Drive Capability
Power Mode) and 226mW Power Consumption
per Channel (Low-Power Mode)
Maximum Gain of 29.5dB
Total Gain Range of 42dB
22nV/ √ √ Hz Ultra-Low Output-Referred Noise at
5MHz
with CW Octal Mixer
PART
OUT
= 1.5V
OUT
Ordering Information
TEMP RANGE
0°C to +70°C
0°C to +70°C
= 1.5V
P-P
and f
P-P
and f
IN
LO
= 5MHz
PIN-PACKAGE
100 TQFP-EP*
100 TQFP-EP*
IN
LO Input
Features
= 5MHz
1

Related parts for MAX2038CCQ+

MAX2038CCQ+ Summary of contents

Page 1

... Optional Individual Channel Drive Capability o 269mW Power Consumption per Channel (Normal Power Mode) and 226mW Power Consumption per Channel (Low-Power Mode) PART MAX2038CCQ+D MAX2038CCQ+TD + Denotes a lead(Pb)-free/RoHS-compliant package Dry packing Tape and reel 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—CW MIXER MODE ( Typical Application Circuit , Figure 7. V M4_EN = 0, CW_FILTER = TEST_MODE = CW_VG = 0, CW_M1 = 0, CW_M2 = signals applied, ...

Page 4

Ultrasound VGA Integrated with CW Octal Mixer AC ELECTRICAL CHARACTERISTICS—VGA MODE ( Typical Application Circuit , Figure M4_EN = 0, CW_FILTER = 1, TEST_MODE = CW_VG = 1, CW_M1 = 0, CW_M2 = ...

Page 5

AC ELECTRICAL CHARACTERISTICS—CW MIXER MODE ( Typical Application Circuit , Figure 7. V CW_FILTER = 1, TEST_MODE = CW_VG = 0, CW_M1 = 0, CW_M2 = 0, VG_CLAMP_MODE = 1, f capacitance to GND at each ...

Page 6

Ultrasound VGA Integrated with CW Octal Mixer AC ELECTRICAL CHARACTERISTICS—CW MIXER MODE (continued) ( Typical Application Circuit , Figure 7. V CW_FILTER = 1, TEST_MODE = CW_VG = 0, CW_M1 = 0, CW_M2 = 0, VG_CLAMP_MODE ...

Page 7

4.75V to 5.25V REF the VGA differential outputs is 60pF, differential capacitance across the VGA outputs is 10pF, R values are 5V +25°C, unless otherwise ...

Page 8

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

Page 9

4.75V to 5.25V REF the VGA differential outputs is 60pF, differential capacitance across the VGA outputs is 10pF, R values are 5V +25°C, unless otherwise ...

Page 10

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

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 +5V Reference Supply. Connect to a low-noise power supply. Bypass to GND with a 0.1µF capacitor as close as possible to the pins. Note that noise performance of the device is ...

Page 13

PIN NAME 70 VGOUT3+ VGA Channel 3 Noninverting Differential Output 71 VGOUT3- VGA Channel 3 Inverting Differential Output 73 LO2 CW LO Input for Channel 2. LO clock input for modes 3 and 4. 74 VGOUT2+ VGA Channel 2 Noninverting ...

Page 14

Ultrasound VGA Integrated with CW Octal Mixer Detailed Description The MAX2038 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 satura- tion. Set VG_CLAMP_MODE low to clamp the VGA dif- ferential outputs at 2.4V . Set the VG_CLAMP_MODE P-P high to ...

Page 16

Ultrasound VGA Integrated with CW Octal Mixer CW Mixer Output Summation The outputs from the octal mixer array are summed internally to produce the total CWD summed beam- formed signal. The octal array produces eight differen- tial quadrature (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 MAX2038 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

TOP VIEW LO1 76 VGOUT1+ 77 VGOUT1- 78 GND 79 DIN 80 GND CLK 83 CW_M1 84 CW_M2 85 VG_CLAMP_MODE LOAD 88 CW_QOUT+ 89 CW_QOUT- 90 CW_IOUT- 91 CW_IOUT ...

Page 24

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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