AD8364ACPZ-WP(RevB) View Datasheet(PDF) - Analog Devices
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Description
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AD8364ACPZ-WP Datasheet PDF : 44 Pages
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AD8364
TEMPERATURE SENSOR INTERFACE
The AD8364 provides a temperature sensor output capable of
driving about 1.6 mA. A 330 Ω-equivalent internal resistance is
connected from TEMP to COMR to provide current sink
capability. The temperature scaling factor of the output voltage is
approximately 2 mV/°C. The typical absolute voltage at 25°C is
about 620 mV.
VPSR
INTERNAL
VPTAT
TEMP
4kΩ
350Ω
1kΩ
COMR
Figure 53. TEMP Interface Simplified Schematic
VREF INTERFACE
An internal voltage reference is provided to the user at Pin VREF.
The VREF voltage is a temperature stable 2.5 V reference that
can drive about 18 mA. An 830 Ω equivalent internal resistance
is connected from VREF to ACOM for 3 mA sink capability.
VPSR
INTERNAL
VOLTAGE
9kΩ
1.465kΩ
VREF
900Ω
COMR
Figure 54. VREF Interface Simplified Schematic
Data Sheet
POWER-DOWN INTERFACE
The operating and stand-by currents for the AD8364 at 25°C are
approximately 70 mA and 500 µA, respectively. The PWDN pin
is connected to an internal resistor divider made with two 42 kΩ
resistors. The divider voltage is applied to the base of an NPN
transistor to force a power-down condition when the device is
active. Typically when PWDN is pulled greater than 2 V, the
device is powered down. Figure 46 and Figure 47 show typical
response times for various RF input levels. The output reaches
to within 0.1 dB of its steady-state value in about 1.6 µs; the
reference voltage is available to full accuracy in a much shorter
time. This wake-up response vary depending on the input
coupling means and the capacitances CDEC[A, B], CHP[A, B],
and CLP[A, B].
PWDN
42kW
POWER DOWN
SIGNAL
42kW
COMR
Figure 55. PWDN Interface Simplified Schematic
VST[A, B] INTERFACE
The VST[A, B] interface has a high input impedance of 72 kΩ.
The voltage at VST[A, B] is converted to an internal current
used to steer the VGA gain. The VGA attenuation control is
set to 20 dB/V.
VST[A, B] 36kΩ
GAIN ADJUST
1.35µA/dB
36kΩ
18.5kΩ
ACOM
Figure 56. VST[A, B] Interface Simplified Schematic
Rev. B | Page 20 of 44
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