MAX14808 Datasheet, PDF (12/31 Pages) Maxim Integrated Products – Octal Three-Level/Quad Five-Level High-Voltage 2A Digital Pulsers with T/R Switch

MAX14808 / MAX14809
Octal Three-Level/Quad Five-Level High-Voltage
2A Digital Pulsers with T/R Switch
AC ELECTRICAL CHARACTERISTICS (continued)
(V_DD = +3V, V_CC = +5V, V_EE = -5V, V_PPA = +100V, V_NNA = -100V, V_PPB = +100V, V_NNB = -100V, V_GNA connected to V_NNA with
1FF capacitor, V_GNB connected to V_NNB with 1FF capacitor, V_GPA connected to V_PPA with 1FF capacitor, V_GPB connected to V_PPB
with 1FF capacitor, V_{LDO_EN} = 0V, V_CC0 = 0V, V_CC1 = 0V, R_L = 1kI, C_L = 240pF, unless otherwise noted. Typical values are at
T_A = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
T/R Switch Harmonic Distortion
(MAX14808)
THD_TRSW R_LOAD = 200I, V_SIGNAL = 100mV_P-P
-50
dB
T/R Switch Turn-On/Off Voltage
Spike (MAX14808)
V_SPIKE R_LOAD = 1kI at both sides of T/R switch
50
mV
Crosstalk
CT
f = 5MHz, adjacent channels, R_{LOUT_} =
200I
-51
dB
Note 2: All devices are 100% production tested at T_A = +85NC. Limits over the operating temperature range are guaranteed by design.
Note 3: Maximum operating current from V_{GN_} and V_{GP_} external power sources can vary depending on application requirements. The
suggested minimum values assume 8 channels running in continuous transmission (CWD) at 5MHz with CC0 = CC1 = high.
Note 4: CW Doppler: continuous wave, f = 5MHz, V_DD = +3V, V_CC = -V_EE = +5V, V_{PP_} = -V_{NN_} = +5V.
Note 5: B mode: f = 5MHz, PRF = 5kHz, 1 period, V_DD = +3V, V_CC = -V_EE = +5V, V_{PP_} = -V_{NN_} = +100V.
Note 6: T/R switch turn-off time is the time required to switch off the bias current of the T/R switch. The off-isolation is not guaranteed.
Timing Diagrams
VPPA = VPPB
VNNA = VNNB
200ns
200µs
Figure 1a. High-Voltage Burst Test (Three Levels)
Maxim Integrated
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