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MAX2038CCQTD

Ultrasound VGA Integrated with CW Octal Mixer

Maxim Integrated 

Ultrasound VGA Integrated

with CW Octal Mixer

AC ELECTRICAL CHARACTERISTICS—CW MIXER MODE

(Typical Application Circuit, Figure 7. VCC = VREF = 4.75V to 5.25V, TA = 0°C to +70°C, VGND = 0V, LOW_PWR = 0, M4_EN = 0,

CW_FILTER = 1, TEST_MODE = 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

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

Maximum Output Voltage at

ClampOFF

CW MIXER MODE

Mixer RF Frequency Range

Mixer LO Frequency Range

Mixer IF Frequency Range

Maximum Input Voltage Range

Differential Input Resistance

Input-Referred Noise Voltage

Third-Order Intermodulation

Distortion

Mixer Output Voltage Compliance

Channel-to-Channel Phase

Matching

Channel-to-Channel Gain

Matching

Transconductance (Note 13)

VG_CLAMP_MODE = 1, VG_CTL set for

+20dB of gain, 350mVP-P differential input

2.8

VP-P

differential

IMD3

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

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)

(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, 1VP-P

CW_FILTER = 0 differential, fLO/16 = 1MHz

0.9

1

4.75

633

1440

6

4.6

-50

±3.0

±2

2.8

2.8

7.6

MHz

7.5

MHz

100

kHz

1.8

VP-P

differential

Ω

nV/√Hz

dBc

12

V

Degrees

dB

mS

_______________________________________________________________________________________ 5

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