MAX2078CTK(2009) Ver la hoja de datos (PDF) - Maxim Integrated

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MAX2078CTK
(Rev.:2009)

Octal-Channel Ultrasound Front-End with CW Doppler Mixers

Maxim Integrated 

Octal-Channel Ultrasound Front-End

with CW Doppler Mixers

AC ELECTRICAL CHARACTERISTICS—VGA MODE (continued)

(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 2)

PARAMETER

Absolute Gain Error

Input Gain Compression

VGA Gain Response Time

CONDITIONS

MIN

Measured at TA = +25oC, VG+ - VG- = -2V

Measured at TA = +25oC, VG+ - VG- = 0V

Measured at TA = +25oC, VG+ - VG- = +2V

VG+ - VG- = -3V (VGA minimum gain), gain ratio with

330mVP-P/50mVP-P input tones

LNA low gain = 12.5dB, VG+ - VG- = -3V (VGA minimum

gain), gain ratio with 600mVP-P/50mVP-P

Gain step up (VIN = 5mVP-P, gain changed from 10dB to

44dB, settling time is measured within 1dB final value)

Gain step down (VIN = 5mVP-P, gain changed from 44dB

to 10dB, settling time is measured within 1dB final value)

TYP

±0.4

±0.4

±0.4

1.4

0.8

1.4

1.6

MAX UNITS

dB

dB

µs

VGA Output Offset Under Pulsed

Overload

Small-Signal Output Noise

Large-Signal Output Noise

Second Harmonic (HD2)

High-Gain IM3 Distortion

Overdrive is ±10mA in clamping diodes, gain at 30dB,

16 pulses at 5MHz, repetition rate 20kHz; offset is

measured at output when RF duty cycle is off

20dB of gain, VG+ - VG- = -0.85, no input signal

20dB of gain, VG+ - VG- = -0.85, fRF = 5MHz,

fNOISE = fRF + 1kHz, VOUT = 1VP-P differential

VIN = 50mVP-P, fRF = 2MHz, VOUT = 1VP-P

VIN = 50mVP-P, fRF = 5MHz, VOUT = 1VP-P

VIN = 50mVP-P, fRF1 = 5MHz, fRF2 = 5.01MHz,

VOUT = 1VP-P (Note 8)

180

23

35

-67

-64.2

-52

-61

mV

nV/√Hz

nV/√Hz

dBc

dBc

D43/D42/D41/D40 = 0/0/0/1 (RIN = 200Ω, LNA gain =

Low-Gain IM3 Distortion

12.5dB),VIN = 100mVP-P, fRF1 = 5MHz, fRF2 = 5.01MHz,

-50

-60

dBc

VOUT = 1VP-P (Note 8)

Standby Mode Power-Up

Gain set for 26dB fRF = 5MHz, VOUT = 1VP-P, settled with

2.1

µs

Response Time

in 1dB from transition on NP pin

Standby Mode Power-Down

Response Time

To reach DC current target ±10%

2.0

µs

Power-Up Response Time

Gain set for 28dB, fRF = 5MHz, VOUT = 1VP-P, settled

within 1dB from transition on PD

2.7

ms

Power-Down Response Time

Adjacent Channel Crosstalk

Nonadjacent Channel Crosstalk

Phase Matching Between

Channels

Gain set for 28dB, fRF = 5MHz, DC power reaches

6mW/channel, from transition on PD

VOUT = 1VP-P differential, fRF = 10MHz, 28dB of gain

VOUT = 1VP-P differential, fRF = 10MHz, 28dB of gain

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

fRF = 10MHz

5

-58

-71

±1.2

ns

dBc

dBc

Degrees

_______________________________________________________________________________________ 5

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