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MAX2079CXE

Low-Power, High-Performance, Fully Integrated Octal Ultrasound Receiver (Octal LNA, VGA, AAF, ADC, and CWD Beamformer)

Maxim Integrated 

MAX2079

Low-Power, High-Performance, Fully Integrated

Octal Ultrasound Receiver (Octal LNA, VGA,

AAF, ADC, and CWD Beamformer)

AC ELECTRICAL CHARACTERISTICS—VGA MODE (CWD Beamformer Off) (continued)

(VREF = 2.5V, VCC3 = 3.13V to 3.47V, VCC5 = 4.5V to 5.25V, VAVDD = VOVDD = 1.7V to 1.9V, TA = 0NC to +70NC, VGND = 0V, SHDN = 0,

CWD = 0, LOON = 0, fRF = 5MHz, 50mVP-P, ADC fCLK = 50Msps, digital HPF set to 60/64, two poles, 15/16 digital gain, VGC+ -

VGC- = -3V (minimum gain), high LNA gain. Typical values are at VREF = 2.5V, VCC3 = 3.3V, VCC5 = 4.75V, VAVDD = VOVDD = 1.8V,

VGC+ - VGC- = 0V, TA = +25NC, unless otherwise noted.) (Note 3)

PARAMETER

CONDITIONS

MIN

8-Channel Correlated Noise

Power

No input signal, ratio of 8-channel noise power to

single-channel noise power

5MHz signal applied to all 8 channels, VGC+ - VGC- = 0V,

fRF = 5MHz at -3dBFS, ratio of 8-channel noise power to

single-channel noise power

LNA Gain (Low LNA Gain)

LNA Gain (High LNA Gain)

Maximum Gain (High LNA Gain) VGC+ - VGC- = +3V (max gain), LNA input to ADC Input

Minimum Gain (High LNA Gain) VGC+ - VGC- = -3V (min gain), LNA input to ADC Input

Maximum Gain (Low LNA Gain) VGC+ - VGC- = +3V (max gain), LNA input to ADC Input

Minimum Gain (Low LNA Gain) VGC+ - VGC- = = -3V (min gain), LNA input to ADC input

Gain Range

9MHz setting

10MHz setting

AA Filter 3dB Corner Frequency

15MHz setting

18MHz setting

AA Filter 3dB Corner Frequency

Accuracy

Digital Highpass Filter 3dB

Corner Frequency

Clamp Level

2 poles, coefficients R1 = R2 = 63/64, fCLK = 50Msps

2 poles, coefficients R1 = R2 = 54/64, fCLK = 50Msps

Clamp on (VP-P on AAF Output/ADC Input, digital HPF

bypassed)

Device-to-Device Gain Matching TA = +25NC, VGC+ - VGC- = -3V to +3V (Note 6)

-1.6

Input Gain Compression

LNA = high gain, VGC+ - VGC- = -3V (VGA = min gain),

gain ratio with 330mVP-P/50mVP-P input tones

LNA = low gain, VGC+ - VGC- = -3V (VGA = min gain),

gain ratio with 600mVP-P/50mVP-P input tones

VGA Gain Response Time

Gain step up (VIN = 5mVP-P, VGC+ - VGC- changed from

-3V to +3V, settling time is measured within 1dB final value)

Gain step down (VIN = 5mVP-P, VGC+ - VGC- changed from

-3V to +3V, settling time is measured within 1dB final value)

VGA Output Offset Under

Pulsed Overload

Over drive is Q10mA in clamping diodes, VGC+ - VGC- =

1.0V (gain = 30dB), 16 pulses at 5MHz, repetition rate

20kHz; offset is measured at output when RF duty cycle is off

Signal-to-Noise Over ADC

Nyquist Band (25MHz)

VOUT_ = -1dBFS, VIN = 200mVP-P, fRF = 5MHz at -1dBFS,

anti-alias filter = 9MHz, 50Msps sample rate

TYP

9.0

8.5

12.5

18.5

44.7

5.9

40.4

1.4

38.8

9

10

15

18

Q10

0.185

1.736

92

Q0.5

0.7

0.9

0.8

1.8

< 3.3

67

MAX

+1.6

UNITS

dB

dB

dB

dB

dB

dB

dB

dB

MHz

%

MHz

%FS

dB

dB

Fs

%FS

dBFS

Maxim Integrated

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