MAX2036 Maxim Integrated Products, MAX2036 Datasheet - Page 6

• Manufacturer Part Number: MAX2036
• Description: Ultrasound VGA Integrated
• Manufacturer: Maxim Integrated Products

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Ultrasound VGA Integrated
with CW Octal Mixer
AC ELECTRICAL CHARACTERISTICS—CW MIXER MODE (continued)
(Figure 7, V
PD = 0, CW_VG = 0, CW_M1 = 0, CW_M2 = 0, VG_CLAMP_MODE = 1, f
differential outputs is 60pF, differential capacitance across the VGA outputs is 10pF, R
through four separate ±0.1% 115Ω resistors, differential mixer inputs are driven from a low-impedance source. Typical values are at
V
Note 2: Specifications at T
Note 3: Noise performance of the device is dependent on the noise contribution from the supply to V
Note 4: Total on-chip power dissipation is calculated as P
Note 5: Note that the LVDS CWD LO clocks are DC-coupled. This is to ensure immediate synchronization when the clock is first
Note 6: External 100Ω resistor terminates the LVDS differential signal path.
Note 7: The mixer common-mode current (3.25mA/channel) is specified as the common-mode current in each of the differential
Note 8: Specification guaranteed only for DOUT driving DIN of the next device in a daisy-chain fashion.
Note 9: This response time does not include the CW output highpass filter. When switching to VGA mode, the CW outputs stop
Note 10: See the Ultrasound-Specific IMD3 Specification in the Applications Information section.
Note 11: Mixer output-voltage compliance is the range of acceptable voltages allowed on the CW mixer outputs.
Note 12: Channel-to-channel gain-and-phase matching measured on 30 pieces during engineering characterization at room temper-
Note 13: Transconductance is defined as the quadrature summing of the CW differential output current at baseband divided by the
6
SERIAL SHIFT REGISTER
Serial Shift Register Programming
Rate
Minimum Data Set-Up Time
Minimum Data Hold Time
Minimum Data Clock Time
Minimum Data Clock Pulse Width
High
Minimum Data Clock Pulse Width
Low
Minimum Load Line
Minimum Load Line High to Mixer
Clock On
Minimum Data Clock to Load
Line High
CC
_______________________________________________________________________________________
= V
REF
design and characterization.
for V
noise.
turned on. An AC-coupled LO is problematic in that the RC time constant associated with the coupling capacitors and the
input impedance of the pin causes there to be a period of time (related to the RC time constant) when the DC level on the
chip side of the capacitor is outside the acceptable common-mode range and the LO swing does not exceed both the
logic thresholds required for proper operation. This problem associated with AC-coupling would cause an inability to
ensure synchronization among beamforming channels. The LVDS signal is terminated differentially with an external 100Ω
resistor on the board.
mixer outputs (CW_QOUT+, CW_QOUT-, CW_IOUT+, CW_IOUT-).
drawing current and the output voltage goes to the rail. If a highpass filter is used, the recovery time can be excessive and
a switching network is recommended as shown in the Applications Information section.
ature. Each mixer is used as a phase detector and produces a DC voltage in the IQ plane. The phase is given by the angle
of the vector drawn on that plane. Multiple channels from multiple parts are compared to each other to produce the phase
variation.
mixer’s input voltage.
PARAMETER
CC
= 5V, T
REF
= V
. V
REF
A
CC
= +25°C, unless otherwise noted.) (Note 2)
= 4.75V to 5.25V, T
and V
A
REF
= +25°C and T
can be connected together to share the same supply voltage if the supply for V
t
t
SYMBOL
DCLKPWH
DCLKPWL
t
MIXCLK
t
t
DCLK
t
t
DSU
HLD
CLH
t
LD
A
A
= 0°C to +70°C, V
= +70°C are guaranteed by production. Specifications at T
DISS
GND
= V
CONDITIONS
CC
= 0, LOW_PWR = 0, M4_EN = 0, CW_FILTER = 1, TMODE = 0,
x I
RF
CC
= f
+ V
LO
REF
/16 = 5MHz, capacitance to GND at each of the VGA
x I
REF
L
= 1kΩ, CW mixer outputs pulled up to +11V
+ [11V - (I
MIN
MIX
REF
/4) x 115] x I
A
. Use a low-noise supply
TYP
100
= 0°C are guaranteed by
30
30
30
30
30
30
2
CC
MAX
exhibits low
MIX
10
.
UNITS
MHz
ns
ns
ns
ns
ns
ns
ns
ns