MAX2078CTK+ Maxim Integrated Products, MAX2078CTK+ Datasheet - Page 16

• Manufacturer Part Number: MAX2078CTK+
• Description: IC FRNT-END ULTRASOUND 8CH 68QFN
• Manufacturer: Maxim Integrated Products
• Type: Ultrasound Receiversr

Specifications of MAX2078CTK+

• Applications: Medical Ultrasound Imaging, Sonar
• Mounting Type: Surface Mount
• Package / Case: 68-TQFN Exposed Pad
• Operating Supply Voltage: 3.13 V to 3.47 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Octal-Channel Ultrasound Front-End
with CW Doppler Mixers
** When coupled with the MAX1437B ADC.
The MAX2078 is a high-density, octal-channel ultra-
sound receiver optimized for low cost, high-channel
count, high-performance portable and cart-based ultra-
sound applications. The integrated octal LNA, VGA,
AAF, and programmable CWD beamformer offer a
complete multi-specialty, ultrasound receiver solution.
Imaging path dynamic range has been optimized for
exceptional second-harmonic performance. The com-
plete imaging receive channel exhibits an exceptional
68dBFS** SNR at 5MHz. The bipolar front-end has also
been optimized for exceptionally low near-carrier mod-
ulation noise for exceptional low-velocity pulsed and
color-flow Doppler sensitivity under high-clutter condi-
tions, achieving an impressive near-carrier SNR of
140dBc/Hz at 1kHz offset from a V
clutter signal.
Table 1. Summary of Programming Bits
Table 2. Logic Functions of Programming Bits
X = Don’t care.
16
D46
X
X
X
X
X
X
X
X
X
X
X
X
X
______________________________________________________________________________________
D45
D40, D41, D42
X
X
X
X
X
X
X
X
X
0
0
1
1
BIT NAME
D44, D45
D0–D39
D43
D46
Detailed Description
D44
X
X
X
X
X
X
X
X
X
0
1
0
1
D43
OUT
X
X
X
X
1
1
1
1
0
0
0
0
1
= 1V
Input impedance programming
LNA gain (D43 = 0 is low gain)
Anti-alias filter f
Don’t care
Beamformer programming, from channel 1 to 8
P-P
D42
X
X
X
X
0
0
0
0
0
0
0
0
1
, 5MHz
D41
C
0
0
1
1
0
0
1
1
X
X
X
X
X
programming
The MAX2078 also integrates an octal quadrature
mixer array and programmable LO phase generators
for a complete continuous-wave Doppler (CWD) beam-
forming solution. Separate mixers for each channel are
available for optimal CWD sensitivity, yielding an
impressive SNR of 154dBc/Hz at 1kHz offset from a
200mV
tion for each channel is programmed using a digital
serial interface and a single high-frequency clock. The
serial interface is designed to allow multiple devices to
be easily daisy-chained to minimize program interface
wiring. The outputs of the mixers are summed into sin-
gle I and Q differential current outputs.
The MAX2078 requires programming before it can be
used. The operating modes are controlled by 47 pro-
gramming bits. Tables 1 and 2 show the functions of
these programming bits.
D40
P-P
X
X
X
X
X
0
1
0
1
0
1
0
1
, 1.25MHz input signal. The LO phase selec-
DESCRIPTION
R
R
IN
IN
= 100Ω, LNA gain = 12.5dB
= 50Ω, LNA gain = 18.5dB
Open feedback
R
R
R
R
R
R
f
f
f
f
C
C
C
Modes of Operation
IN
IN
C
IN
IN
IN
IN
MODE
= 10MHz
= 15MHz
= 18MHz
= 9MHz
= 1000Ω
= 2000Ω
= 100Ω
= 200Ω
= 200Ω
= 400Ω