Datasheet
MAX2078
Octal-Channel Ultrasound Front-End
with CW Doppler Mixers
14 ______________________________________________________________________________________
Pin Description (continued)
PIN NAME FUNCTION
37 OUT7+ Channel 7 Positive Differential Output
38 OUT6- Channel 6 Negative Differential Output
39 OUT6+ Channel 6 Positive Differential Output
40 OUT5- Channel 5 Negative Differential Output
41 OUT5+ Channel 5 Positive Differential Output
42 LO-
43 LO+
Differential Local Oscillator Input. LO is divided in the beamformer.
45 OUT4- Channel 4 Negative Differential Output
46 OUT4+ Channel 4 Positive Differential Output
47 OUT3- Channel 3 Negative Differential Output
48 OUT3+ Channel 3 Positive Differential Output
49 OUT2- Channel 2 Negative Differential Output
50 OUT2+ Channel 2 Positive Differential Output
51 OUT1- Channel 1 Negative Differential Output
52 OUT1+ Channel 1 Positive Differential Output
54 CLK
Serial Port Clock Input (Positive Edge Triggered). 3.3V CMOS. Clock input for programming the serial
shift registers.
55 DIN Serial Port Data Input. 3.3V CMOS. Data input to program the serial shift registers.
56 CS
Serial Port Chip Select Input. 3.3V CMOS. Used to store programming bits in registers, as well as in
CW mode, synchronizing all channel phases (on a rising edge).
57 NP
VGA Standby Mode Select Input. Set NP to 1 to place the entire device in standby mode. Overrides
soft channel shutdown in serial shift register, but not general power-down (PD).
58 V/C
VGA/CW Mode Select Input. Set V/C to a logic-high to enable the VGAs and disable CW mode. Set
V/C to a logic-low to enable the CW mixers and disable the VGA mode.
59 CQ-
8-Channel CW Negative Quadrature Output. Connect to an external 11V power supply with a 162Ω
external pullup resistor.
60 CQ+
8-Channel CW Positive Quadrature Output. Connect to an external 11V power supply with a 162Ω
external pullup resistor.
61 CI-
8-Channel CW Negative In-Phase Output. Connect to an external 11V power supply with a 162Ω
external pullup resistor.
62 CI+
8-Channel CW Positive In-Phase Output. Connect to an external 11V power supply with a 162Ω
external pullup resistor.
65 ZF1 Channel 1 Active Impedance Matching Line. AC-couple to source with a 10nF capacitor.
66 IN1 Channel 1 Input
67 INC1
Channel 1 Clamp Input. Connect to the input coupling capacitor. See the Typical Application Circuits
for details.
68 ZF2 Channel 2 Active Impedance Matching Line. AC-couple to source with a 10nF capacitor.
—EP
Exposed Pad. Internally connected to ground. Connect to a large ground plane using multiple vias to
maximize thermal and electrical performance. Not intended as an electrical connection point.