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PDF MAX2036 Data sheet ( Hoja de datos )
| Número de pieza | MAX2036 | |
| Descripción | Ultrasound VGA Integrated | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-4420; Rev 0; 1/09
www.DataSheet4U.com
Ultrasound VGA Integrated
with CW Octal Mixer
General Description
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 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 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.
Applications
Ultrasound Imaging
Sonar
Features
♦ 8-Channel Configuration
♦ High Integration for Ultrasound Imaging
Applications
♦ Pin Compatible with the MAX2035 Ultrasound
VGA
VGA Features
♦ 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
♦ ±0.5dB Absolute Gain Error
♦ 120mW Consumption per Channel
♦ Switchable Output VGA Clamp Eliminating ADC
Overdrive
♦ Fully Differential VGA Outputs for Direct ADC
Drive
♦ Variable Gain Range Achieves 50dB Dynamic
Range
♦ -62dBc HD2 at VOUT = 1.5VP-P and fIN = 5MHz
♦ Two-Tone Ultrasound-Specific* IMD3 of -52dBc at
VOUT = 1.5VP-P and fIN = 5MHz
CWD Mixer Features
♦ Low Mixer Noise of -155dBc/Hz at 1kHz Offset
from 1.25MHz Carrier
♦ Serial-Programmable LO Phase Generator for 4, 8,
16 LO Quadrature Phase Resolution
♦ Optional Individual Channel 4 x fLO LO Input
Drive Capability
♦ 269mW Power Consumption per Channel (Normal
Power Mode) and 226mW Power Consumption
per Channel (Low-Power Mode)
♦ CWD Implementation Is Fully Compliant with All
Patents Related to Ultrasound Imaging
Techniques
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX2036CCQ+D
0°C to +70°C
100 TQFP-EP†
MAX2036CCQ+TD 0°C to +70°C 100 TQFP-EP†
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape-and-reel package.
D = Dry packing.
†EP = Exposed pad.
*See the Ultrasound-Specific IMD3 Specification in the
Applications Information section.
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
www.DataSheet4U.com
Ultrasound VGA Integrated
with CW Octal Mixer
AC ELECTRICAL CHARACTERISTICS—CW MIXER MODE (continued)
(Figure 7, VCC = VREF = 4.75V to 5.25V, TA = 0°C to +70°C, VGND = 0, LOW_PWR = 0, M4_EN = 0, CW_FILTER = 1, TMODE = 0,
PD = 0, CW_VG = 0, CW_M1 = 0, CW_M2 = 0, VG_CLAMP_MODE = 1, fRF = fLO/16 = 5MHz, capacitance to GND at each of the
VGA differential outputs is 60pF, differential capacitance across the VGA outputs is 10pF, RL = 1kΩ, CW mixer outputs pulled up to
+11V through four separate ±0.1% 115Ω resistors, differential mixer inputs are driven from a low-impedance source. Typical values
are at VCC = VREF = 5V, TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETER
Maximum Output Voltage at
Clamp ON
Maximum Output Voltage at
Clamp OFF
CW MIXER MODE
Mixer RF Frequency Range
Mixer LO Frequency Range
Mixer IF Frequency Range
SYMBOL
CONDITIONS
VG_CLAMP_MODE = 0,
VG_CTL set for +20dB of gain,
350mVP-P differential input
VG_CLAMP_MODE = 1,
VG_CTL set for +20dB of gain,
350mVP-P differential input
MIN TYP MAX UNITS
2.2
VP-P
differential
3.4
VP-P
differential
0.9 7.6 MHz
1 7.5 MHz
100 kHz
Maximum Input Voltage Range
Differential Input Resistance
Input-Referred Noise Voltage
CW_FILTER = 0
CW_FILTER = 1
Mode 3, fRF = fLO/4 = 1.25MHz, measured at a
1kHz offset frequency; clutter tone at 0.9VP-P
differential measured at the mixer input
Mode 3, RF terminated into 50Ω;
fLO/4 = 1.25MHz, measured at 1kHz offset
633
1440
6
4.6
1.8 VP-P
differential
Ω
nV/√Hz
Third-Order Intermodulation
Distortion
IMD3
Mode 1, fRF1 = 5MHz at 0.9VP-P differential
input, Doppler tone fRF2 = 5.01MHz at 25dBc
from clutter tone, fLO/16 = 5MHz (Note 10)
-50
dBc
Mixer Output Voltage Compliance
Channel-to-Channel Phase
Matching
Channel-to-Channel Gain
Matching
Transconductance
(Note 13)
(Note 11)
Measured under zero beat conditions,
fRF = 5MHz, fLO/16 = 5MHz (Note 12)
Measured under zero beat conditions,
fRF = 5MHz, fLO/16 = 5MHz (Note 12)
CW_FILTER = 1
fRF = 1.1MHz at 1VP-P
differential,
fLO/16 = 1MHz
CW_FILTER = 0
(low LPF cutoff
frequency)
fRF = 1.1MHz at 1VP-P
differential,
fLO/16 = 1MHz
4.75
12.00
V
±3 Degrees
±2 dB
2.8
mS
2.8
_______________________________________________________________________________________ 5
5 Page 
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Ultrasound VGA Integrated
with CW Octal Mixer
Pin Description
PIN
1
2
3
4
5, 10, 19, 24,
29, 34, 58,
79, 81, 96
6
7
8
9
11
12
13
14
15
16, 42, 46,
54, 72, 82, 87
17
18
20
21
22
23
25
26
27
28
30
31
32
33
35
36
37, 93
NAME
CWIN2-
CWIN2+
VGIN3-
VGIN3+
GND
CWIN3-
CWIN3+
VGIN4-
VGIN4+
CWIN4-
CWIN4+
EXT_C1
EXT_C2
EXT_C3
VCC
VGIN5-
VGIN5+
CWIN5-
CWIN5+
VGIN6-
VGIN6+
CWIN6-
CWIN6+
VGIN7-
VGIN7+
CWIN7-
CWIN7+
VGIN8-
VGIN8+
CWIN8-
CWIN8+
VREF
FUNCTION
CW Mixer Channel 2 Inverting Differential Input
CW Mixer Channel 2 Noninverting Differential Input
VGA Channel 3 Inverting Differential Input
VGA Channel 3 Noninverting Differential Input
Ground
CW Mixer Channel 3 Inverting Differential Input
CW Mixer Channel 3 Noninverting Differential Input
VGA Channel 4 Inverting Differential Input
VGA Channel 4 Noninverting Differential Input
CW Mixer Channel 4 Inverting Differential Input
CW Mixer Channel 4 Noninverting Differential Input
External Compensation. Connect a 4.7μF capacitor to ground as close as possible to the pin to
bypass the internal biasing circuitry.
External Compensation. Connect a 4.7μF capacitor to ground as close as possible to the pin to
bypass the internal biasing circuitry.
External Compensation. Connect a 4.7μF capacitor to ground as close as possible to the pin to
bypass the internal biasing circuitry.
5V Power Supply. Connect to an external +5V power supply. Bypass each VCC supply to ground
with 0.1μF capacitors as close as possible to the pins.
VGA Channel 5 Inverting Differential Input
VGA Channel 5 Noninverting Differential Input
CW Mixer Channel 5 Inverting Differential Input
CW Mixer Channel 5 Noninverting Differential Input
VGA Channel 6 Inverting Differential Input
VGA Channel 6 Noninverting Differential Input
CW Mixer Channel 6 Inverting Differential Input
CW Mixer Channel 6 Noninverting Differential Input
VGA Channel 7 Inverting Differential Input
VGA Channel 7 Noninverting Differential Input
CW Mixer Channel 7 Inverting Differential Input
CW Mixer Channel 7 Noninverting Differential Input
VGA Channel 8 Inverting Differential Input
VGA Channel 8 Noninverting Differential Input
CW Mixer Channel 8 Inverting Differential Input
CW Mixer Channel 8 Noninverting Differential Input
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 dependent on the
noise contribution from the supply to VREF. Use a low-noise supply for VREF. VCC and VREF can be
connected together to share the same supply voltage if the supply for VCC exhibits low noise.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet MAX2036.PDF ] | |
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