HV7321 datasheet(20/30 Pages) MICROCHIP

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HV7321

DS20005639A-page 20

 2016 Microchip Technology Inc.

4.3.4

CW MODE-0

CW Mode-0 enables continuous wave mode provided

solely by the HV7321. OEN = 1, MODE = 0 and

PWS = 0 activate CW Mode-0. FPGA selects VPP1 and

VNN1 amplitudes via SEL/NEG/POS inputs.

In theory, VPP0 and VNN0 can be selected but this is

strongly discouraged since VPP0 and VNN0 usage

increases power consumption and causes excessive

heating in CW Mode-0.

4.3.5

CW MODE-1

CW Mode-1 is enabled using an external CW signal

source for continuous wave mode. OEN = 1 and

MODE = 1 activate CW Mode-1. External CW signals

can connect to any of CWIN0-3. In this mode, the

CW signal source also feeds the CLK input. See

Table 4-3 for details.

4.3.5.1

External CW Beamformer Option

(CW Mode-1)

The HV7321 has built-in CW switches that allow the

use of an external CW beamformer to further minimize

jitter and phase noise on CW waveforms. This mode is

called CW Mode-1.

One suggested external CW beamformer is the

MD1730, which has very low phase noise and

8-channel CW output. A pair of HV7321s can operate

with the MD1730 as an 8-channel CW waveform

generator. See Figure 4-2.

The

MD1730

supports

both

differential

and

single-ended signals using CLKP and CLKN inputs.

The MD1730 enables setting the CW output phase

delay and frequency for channels via SPI. Please refer

to the MD1730 data sheet for more information.

FIGURE 4-2:

HV7321 + MD1730 Integration.

TABLE 4-3:

MODE & PWS LOGIC INPUTS

Mode

PWS

State

CW Mode-0

Pulsed-Echo

CW Mode-1

TABLE 4-3:

MODE & PWS LOGIC INPUTS

Mode

PWS

State

1 of 4 channles

+1V to +8V

+2.5V

RX0

-10V

TXRW

to next

HV7321

CLK

to other

ICs

CTRN[3:0]

OTPN

DT[63:0]

TX FPGAI/Os

OEN

REN

MODE

PWS

OTPN

SEL0

NEG0

POS0

SEL3

NEG3

POS3

CLK

CWIN0

CWIN1

CWIN2

CWIN3

GND

VSUB

SUB

VGN

RX1-3

TX1-3

RGND

RXDMP

RX0

TX0

VNN1

VPP1

VNN0

VPP0

VGP

VPP

VLL

+5V

+10V

0V to +80V

0V to -80V

0V to +80V

TRSW

RTZSW

VPF1

VNF1

VPF0

VNF0

Decode

& Level

Shift

+2.5V +5V

+10V

VGP

VPP

VLL

CPF VCW+

CKB0

VLL

CBE1

CLK

VLL

CBE0

VCW+

CKB1

CW0

CW1

CW2

CW3

CW4~7

to next

HV7321

CWIN0 3

VCW-

CNF

VGN

DAP

GND

SUB

other CW

channels

1 of 8

channels

MD1730

VCW-

VPF

VNF

Fre. Dvdr

& Phase

Delay

SPI

LVDS

CLK

CWSW

HV7321

-1V to -8V

-10V

SPIM

SDO

SDI

SCK

CLK

CBE0,1

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