CW01 Datasheet, PDF (1/8 Pages) Supertex, Inc – Four-Channel, Low Phase Noise, Low Power, Continuous Wave Transmitter

Supertex inc.
CW01
Four-Channel, Low Phase Noise,
Low Power, Continuous Wave Transmitter
Features
►► Low phase noise
►► 100V open drain N-channel
►► High speed D flip-flop
►► High speed MOSFET gate driver
►► Up to 200MHz clock input
►► V_DD and V_LL undervoltage lockout
Applications
►► Diagnostic medical ultrasound
►► Fluid flow measurement
Typical Application Circuit
General Description
The Supertex CW01 is a four-channel, low phase noise,
continuous wave transmit IC. A high speed D flip-flop is
provided to allow the D_IN frequency to be aligned to a high
frequency clock. The output N-channel is turned on when a
logic high is clocked into the D flip-flop. Data are clocked in
during the low to high transition.
VD1, VD2, VD3 and VD4 are four individual input supply
voltages for the N-channel output MOSFET gate drivers.
High peak currents are drawn from these gate drives
when the output MOSFETs are switching. To minimize
jitter caused by voltage ripples, each channel has its own
gate drive voltage pin; VD1, VD2, VD3 and VD4. A series
ferrite bead and a decoupling capacitor are recommended
on each VDX pin to minimize output jitter and channel to
channel crosstalk.
Both V_DD and V_LL have undervoltage lockout to prevent
spurious turn-on.
8.0V
5.0V
0.1µF
2.5V
0.1µF
2.0 to
5.0MHz
96MHz
(one of four channels)
VD1
VDD
OE
VLL
D_IN1
CLK
VSS
D_IN1
Q1
CLK
V_LL V_D1
Translator
and Driver
270µH
BAV99
BAV23
HV_OUT1
PGND1
Tx
PZT
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com