MAX2077CTN 查看數據表（PDF） - Maxim Integrated
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MAX2077CTN Datasheet PDF : 19 Pages
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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
Absolute Gain Error
Input Gain Compression
VGA Gain Response Time
CONDITIONS
MIN TYP MAX UNITS
VG+ - VG- = -2V
VG+ - VG- = 0V
±0.4
±0.4
dB
VG+ - VG- = +2V
±0.4
VG+ - VG- = -3V (VGA minimum gain), gain ratio with
330mVP-P/50mVP-P input tones
1.4
dB
LNA low gain = 12.5dB, VG+ - VG- = -3V (VGA minimum
gain), gain ratio with 600mVP-P/50mVP-P
0.8
Gain step up (VIN = 5mVP-P, gain changed from 10dB to
1.4
44dB, settling time is measured within 1dB final value)
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 Overdrive is ±10mA in clamping diodes, gain at 30dB,
Overload
16 pulses at 5MHz, repetition rate 20kHz; offset is
measured at output when RF duty cycle is off
180
mV
Small-Signal Output Noise
Large-Signal Output Noise
Second Harmonic (HD2)
High-Gain IM3 Distortion
20dB of gain, VG+ - VG- = -0.85V, no input signal
20dB of gain, VG+ - VG- = -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
D3/D2/D1/D0 = 1/0/1/0 (RIN = 200, LNA gain =
18.5dB), VIN = 50mVP-P, fRF1 = 5MHz, fRF2 = 5.01MHz,
VOUT = 1VP-P (Note 8)
23
35
-67
-64.2
-52 -61
nV/Hz
nV/Hz
dBc
dBc
D3/D2/D1/D0 = 0/0/0/1 (RIN = 200, 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
2.1
μs
Response Time
within 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
4 _______________________________________________________________________________________
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