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參數資料
| 型號： | MAX2038CCQ+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 14/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VGA W/OCTAL MIXER 8CH 100TQFP |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 250 |
| 類型： | 可變增益放大器 |
| 應用： | 醫(yī)療用超聲波成像，聲納 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 100-TQFP 裸露焊盤 |
| 供應商設備封裝： | 100-TQFP-EP（14x14） |
| 包裝： | 帶卷 (TR) |
MAX2038
Ultrasound VGA Integrated
with CW Octal Mixer
______________________________________________________________________________________
21
CW Mixer Output Summation
The maximum differential current output is typically
3mAP-P and the mixer output compliance voltage
ranges from 4.75V to 12V per mixer channel. The mixer
common-mode current in each of the differential mixer
outputs is typically 3.25mA. The total summed current
would equal N x 3.25mA in each of the 115
Ω load resis-
tors (where N = number of channels). In this case, the
quiescent output voltage at +VSUM and -VSUM outputs
would be 11V - (N x 3.25mA x 115) = 11V - (8 x 3.25mA
x 115) = 8.05V. The voltage swing at each output, with
one channel driven at max output current (differential
3mAP-P) while the other channels are not driven, would
be 1.5mAP-P x 115
Ω or 174mVP-P and the differential
voltage would be 348mVP-P. The voltage compliance
range is defined as the valid range for +VSUM and -
VSUM in this example.
External Compensation
External compensation is required for bypassing inter-
nal biasing circuitry. Connect as close as possible a
4.7F capacitor from EXT_C1, EXT_C2, and EXT_C3
(pins 13, 14, 15) to ground.
External Bias Resistor
An external resistor at EXT_RES is required to set the
bias for the internal biasing circuitry. Connect, as close
as possible, a 7.5k
Ω (0.1%) resistor from EXT_RES (pin
38) to ground.
Analog Input and Output Coupling
In typical applications, the MAX2038 is being driven from
a low-noise amplifier (such as the MAX2034) and the
VGA is typically driving a discrete differential anti-alias fil-
ter into an ADC (such as the MAX1436 octal ADC). The
differential input impedance of the MAX2038 is typically
240
Ω. The differential outputs of the VGA are capable of
driving a differential load capacitance to GND at each of
the VGA differential outputs of 60pF, and differential
capacitance across the VGA outputs is 10pF, RL =
1k
Ω. The differential outputs have a common-mode
bias of approximately 3.75V. AC-couple these differen-
tial outputs if the next stage has a different common-
mode input range.
Ultrasound-Specific IMD3 Specification
Unlike typical communications specifications, the two
input tones are not equal in magnitude for the ultra-
sound-specific IMD3 two-tone specification. In this
measurement, f1 represents reflections from tissue and
f2 represents reflections from blood. The latter reflec-
tions are typically 25dB lower in magnitude, and hence
the measurement is defined with one input tone 25dB
lower than the other. The IMD3 product of interest (f1 -
(f2 - f1)) presents itself as an undesired Doppler error
signal in ultrasound applications. See Figure 6.
Board Layout
The pin configuration of the MAX2038 is optimized to
facilitate a very compact physical layout of the device
and its associated discrete components. A typical
application for this device might incorporate several
devices in close proximity to handle multiple channels
of signal processing.
The exposed pad (EP) of the MAX2038’s TQFP-EP
package provides a low thermal-resistance path to the
die. It is important that the PCB on which the MAX2038
is mounted be designed to conduct heat from the EP.
In addition, provide the EP with a low-inductance path
to electrical ground. The EP MUST be soldered to a
ground plane on the PCB, either directly or through an
array of plated via holes.
-25dB
ULTRASOUND
IMD3
f1 - (f2 - f1)f2 + (f2 - f1)
f1
f2
Figure 6. Ultrasound IMD3 Measurement Technique
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