MAX2078 Datasheet, PDF (1/25 Pages) Maxim Integrated Products – Octal-Channel Ultrasound Front-End with CW Doppler Mixers

19-4570; Rev 0; 6/09
Octal-Channel Ultrasound Front-End
with CW Doppler Mixers
General Description
The MAX2078 octal-channel ultrasound front-end is a
fully integrated bipolar, high-density octal-channel ultra-
sound receiver optimized for low cost, high-channel
count, high-performance portable and cart-based ultra-
sound systems. The easy-to-use IC allows the user to
achieve high-end 2D, PW, and CW Doppler (CWD)
imaging capability using substantially less space and
power. The highly compact imaging receiver lineup,
including low-noise amplifier (LNA), variable-gain
amplifier (VGA), and anti-alias filter (AAF), achieves an
ultra-low 2.4dB noise figure at R_S = R_IN = 200Ω at a
very low 64.8mW per channel power dissipation. The
full imaging receiver channel has been optimized for
second-harmonic imaging with -64dBFS second-har-
monic distortion performance with a 1V_P-P 5MHz output
signal. The bipolar front-end has also been optimized
for excellent low-velocity PW and color-flow Doppler
sensitivity with an exceptional near-carrier SNR of
140dBc/Hz at 1kHz offset from a 5MHz 1V_P-P output
clutter signal.
A fully integrated high-performance, programmable
CWD beamformer is also included. Separate I/Q mixers
for each channel are available for optimal CWD sensi-
tivity in high-clutter environments, yielding an impres-
sive near-carrier SNR of 154dBc/Hz at 1kHz offset from
a 1.25MHz 200mV_P-P input clutter signal.
The MAX2078 octal-channel ultrasound front-end is
available in a small 10mm x 10mm, 68-pin thin QFN
package with an exposed pad and is specified over a
0°C to +70°C temperature range.
Applications
Medical Ultrasound Imaging
Sonar
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX2078CTK+
0°C to +70°C
68 Thin QFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Features
o 8 Full Channels of LNA, VGA, AAF, and CWD
Mixers in a Small, 10mm x 10mm TQFN Package
o Pin Compatible with MAX2077 with LNA, VGA,
and AAF in 10mm x 10mm TQFN Variant
o Ultra-Low Full-Channel Noise Figure of 2.4dB at
R_IN = R_S = 200Ω
o Low Output-Referred Noise of 23nV/√Hz at 5MHz,
20dB Gain, Yielding a Broadband SNR of 68dB**
for Excellent Second-Harmonic Imaging
o High Near-Carrier SNR of 140dBc/Hz at 1kHz
Offset from a 5MHz, 1V_P-P Output Signal, and
20dB of Gain for Excellent Low-Velocity PW and
Color-Flow Doppler Sensitivity in a High-Clutter
Environment
o Ultra-Low-Power 64.8mW per Full-Channel (LNA,
VGA, and AAF) Normal Imaging Mode (234mW per
Channel in CWD Mode)
o Selectable Active Input-Impedance Matching of
50Ω, 100Ω, 200Ω, and 1kΩ
o Wide Input-Voltage Range of 330mV_P-P in High LNA
Gain Mode and 550mV_P-P in Low LNA Gain Mode
o Integrated Selectable 3-Pole 9MHz, 10MHz,
15MHz, and 18MHz Butterworth AAF
o Fast-Recovery, Low-Power Modes (< 2µs)
o Fully Integrated, High Dynamic Range CWD
Beamformer with Near-Carrier SNR of 154dBc/Hz
at 1kHz Offset from a 1.25MHz, 200mV_P-P Input
Clutter Signal
**When coupled with the MAX1437B ADC.
Pin Configuration
TOP VIEW
IN2 1
INC2 2
ZF3 3
IN3 4
INC3 5
ZF4 6
IN4 7
INC4 8
GND 9
AG 10
ZF5 11
IN5 12
INC5 13
ZF6 14
IN6 15
INC6 16
ZF7 17
68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52
+
MAX2078
*EP
51 OUT1-
50 OUT2+
49 OUT2-
48 OUT3+
47 OUT3-
46 OUT4+
45 OUT4-
44 V_CC1
43 LO+
42 LO-
41 OUT5+
40 OUT5-
39 OUT6+
38 OUT6-
37 OUT7+
36 OUT7-
35 OUT8+
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
*EP = EXPOSED PAD.
THIN QFN
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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.