MAX2077 查看數據表（PDF） - Maxim Integrated

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MAX2077

Octal-Channel Ultrasound Front-End

Maxim Integrated 

Octal-Channel Ultrasound Front-End

AC ELECTRICAL CHARACTERISTICS (continued)

(Typical Application Circuits, VREF = 2.475V to 2.525V, VCC1 = 3.13V to 3.47V, VCC2 = 4.5V to 5.25V, TA = 0°C to +70°C, VGND = 0V,

NP = 0, PD = 0, D3/D2/D1/D0 = 1/0/1/0 (RIN = 200Ω, LNA gain = 18.5dB), D5/D4=1/1(fC = 18MHz), fRF = 5MHz, RS = 200Ω, capaci-

tance to GND at each of the VGA differential outputs is 25pF, differential capacitance across VGA outputs is 15pF, RL = 1kΩ differen-

tial, reference noise less than 10nV/√Hz from 1kHz to 20MHz, DOUT loaded with 10MΩ and 60pF. Typical values are at VCC1 = 3.3V,

VCC2 = 4.75V, TA = +25°C, unless otherwise noted.) (Note 5)

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

3V Supply Modulation Ratio

Gain = 28dB, VG+ - VG- = 0.4V, VOUT = 1VP-P,

fRF = 5MHz, fMOD = 1kHz, VMOD = 50mVP-P, ratio of

output sideband at 5.001MHz, 1VP-P

-73

dBc

4.75V/5V Supply Modulation

Ratio

Gain = 28dB, VG+ - VG- = 0.4V, VOUT = 1VP-P,

fRF = 5MHz, fMOD = 1kHz, VMOD = 50mVP-P, ratio of

output sideband at 5.001MHz, 1VP-P

-82

dBc

Gain Control Lines Common-

Mode Rejection Ratio

Gain = 28dB, VG+ - VG- = 0.4V, VOUT = 1VP-P,

fRF = 5MHz, fMOD(CM) = 1kHz, VMOD(CM) = 50mVP-P,

ratio of output sideband at 5.001MHz to 1VP-P

-74

dBc

Overdrive Phase Delay

Output Impedance

VG+ - VG- = -3V, delay between VIN = 300mVP-P and

VIN = 30mVP-P differential

Differential

5

ns

100

AC ELECTRICAL CHARACTERISTICS—SERIAL PERIPHERAL INTERFACE

(DOUT loaded with 60pF and 10MΩ, 2ns rise and fall edges on CLK.)

PARAMETER

Clock Speed

Mininimum Data-to-Clock Setup

Time

SYMBOL

tCS

CONDITIONS

MIN TYP MAX UNITS

10

MHz

5

ns

Mininimum Data-to-Clock Hold

Time

tCH

Mininimum Clock-to-CS Setup

Time

tES

0

ns

5

ns

CS Positive Mininimum Pulse

Width

tEW

1

ns

Mininimum Clock Pulse Width

tCW

2

ns

Note 5:

Note 6:

Note 7:

Note 8:

Minimum and maximum limits at TA = +25°C and +70°C are guaranteed by design, characterization, and/or production test.

Noise performance of the device is dependent on the noise contribution from VREF. Use a low-noise supply for VREF. The

reference input noise is given for 8 channels, knowing that the reference-noise contributions are correlated in all 8 chan-

nels. If more channels are used, the reference noise must be reduced to get the best noise performance.

Not applicable to the MAX2077CTK.

See the Ultrasound-Specific IMD3 Specification section.

_______________________________________________________________________________________ 5

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