MAX2078 查看數據表（PDF） - Maxim Integrated
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MAX2078 Datasheet PDF : 26 Pages
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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 5)
PARAMETER
Absolute Gain Error
CONDITIONS
Measured at TA = +25oC, VVG+ - VVG- = -2V
Measured at TA = +25oC, VVG+ - VVG- = 0V
Measured at TA = +25oC, VVG+ - VVG- = +2V
MIN TYP MAX UNITS
±0.4
±0.4
dB
±0.4
VVG+ - VVG- = -3V (VGA minimum gain), gain ratio with
1.4
330mVP-P/50mVP-P input tones
Input Gain Compression
dB
LNA low gain = 12.5dB, VVG+ - VVG- = -3V (VGA
0.8
minimum gain), gain ratio with 600mVP-P/50mVP-P
Gain step up (VIN = 5mVP-P, gain changed from 10dB to
1.4
44dB, settling time is measured within 1dB final value)
VGA Gain Response Time
µs
Gain step down (VIN = 5mVP-P, gain changed from 44dB
1.6
to 10dB, settling time is measured within 1dB final value)
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, VVG+ - VVG- = -0.85V, no input signal
20dB of gain, VVG+ - VVG- = -0.85V, 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 11)
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 11)
Standby Mode Power-Up
Response Time
Gain set for 26dB, fRF = 5MHz, VOUT = 1VP-P, settled
with in 1dB from transition on NP pin
2.1
µs
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, VVG+ - VVG- = 0.4V, VOUT = 1VP-P,
fRF = 10MHz
5
-58
-71
±1.2
ns
dBc
dBc
Degrees
_______________________________________________________________________________________ 5
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