MAX2078 查看數據表（PDF） - Maxim Integrated

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MAX2078

Octal-Channel Ultrasound Front-End with CW Doppler Mixers

Maxim Integrated 

Octal-Channel Ultrasound Front-End

with CW Doppler Mixers

AC ELECTRICAL CHARACTERISTICS

(Typical Application Circuit, 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, D43/D42/D41/D40 = 1/0/1/0 (RIN = 200Ω, LNA gain = 18.5dB, D45/D44 = 1/1 (fC = 18MHz), fRF = fLO/16 = 5MHz,

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

differential, 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

Mode Select Response Time

(Note 10)

CONDITIONS

V/C stepped from 0 to 1, DC stable within 10%

V/C stepped from 1 to 0, DC stable within 10%

MIN TYP MAX

1

1

UNITS

µs

High Gain Maximum Input-

Voltage Range

High LNA gain D43/D42/D41/D40 = 1/0/1/0

0.33

VP-P

differential

Low Gain Maximum Input-Voltage

Range

Low LNA gain D43/D42/D41/D40 = 0/0/0/1

0.6

VP-P

differential

AC ELECTRICAL CHARACTERISTICS—VGA MODE

(Typical Application Circuit, 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,

V/C = 1, NP = 0, PD = 0, D43/D42/D41/D40 = 1/0/1/0 (RIN = 200Ω, LNA gain = 18.5dB), D45/D44 = 1/1 (fC = 18MHz), fRF = 5MHz,

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

differential, 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

Input Impedance

Noise Figure

Low-Gain Noise Figure

Input-Referred Noise Voltage

Input-Referred Noise Current

Maximum Gain, High Gain Setting

Minimum Gain, High Gain Setting

Maximum Gain, Low Gain Setting

Minimum Gain, Low Gain Setting

Anti-Aliasing Filter 3dB Corner

Frequency

Gain Range

CONDITIONS

D42/D41/D40 = 0/0/0, RIN = 50Ω

D42/D41/D40 = 0/0/1, RIN = 100Ω

D42/D41/D40 = 0/1/0, RIN = 200Ω

D42/D41/D40 = 0/1/1, RIN = 1000Ω, fRF = 2MHz

RS = RIN = 50Ω, VG+ - VG- = +3V

RS = RIN =100Ω, VG+ - VG- = +3V

RS = RIN = 200Ω, VG+ - VG- = +3V

RS = RIN = 1000Ω, VG+ - VG- = +3V

D43/D42/D41/D40 = 0/0/0/1, LNA gain = 12.5dB,

RS = RIN = 200Ω, VG+ - VG- = +3V

D43/D42/D41/D40 = 1/1/1/0

D43/D42/D41/D40 = 1/1/1/0

VG+ - VG- = +3V

VG+ - VG- = -3V

D43/D42/D41/D40 = 0/0/0/1, VG+ - VG- = +3V

D43/D42/D41/D40 = 0/0/0/1, VG+ - VG- = -3V

D45/D44 = 0/0, fC = 9MHz

D45/D44 = 0/1, fC = 10MHz

D45/D44 = 1/0, fC = 15MHz

D45/D44 = 1/1, fC = 18MHz

VG+ - VG- = -3V to +3V

MIN TYP MAX UNITS

47.5

50

60

90

100

110

Ω

180

200

220

700 830 1000

4.5

3.4

dB

2.4

2.1

3.9

dB

0.9

nV/√Hz

2.1

pA/√Hz

41

42.8

45

dB

8.5

10

11

dB

35

36.8

38

dB

2.5

4

6

dB

9

10

MHz

15

18

33

dB

4 _______________________________________________________________________________________

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