ISL3685 Ver la hoja de datos (PDF) - Intersil
Número de pieza
componentes Descripción
Fabricante
ISL3685 Datasheet PDF : 19 Pages
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ISL3685
Pin Description (Continued)
PIN
NAME
DESCRIPTION
19
REF_IN
Synthesizer Reference Frequency Input, internally DC coupled and requires an external AC coupling capacitor.
20
SYN_VCC2 Synthesizer Positive Power Supply.
21
CP_VCC2 Synthesizer Charge Pump Positive Power Supply.
22
CP_DO
Synthesizer Charge Pump Output, feeds the PLL loop filter.
23 TX_MX_VCC1 Transmit Mixer Positive Power Supply.
24 TX_MX_OUT Transmit Mixer RF output, internal AC coupled and internally matched to 50Ω.
25 TX_MX_VCC1 Transmit Mixer Positive Power Supply.
26 TX_LO_Driver_ Transmit LO Driver Positive Power Supply.
VCC1
27
LO_IN+
Local Oscillator Positive Input, internally AC coupled, internally matched to 50Ω when the LO is driven single ended
and the LO_IN- is grounded.
28
LO_IN-
Local Oscillator Negative Input, internally AC coupled, differential or single ended capability, ground externally for single
ended operation.
29
LO_VCC1 LO Buffer Positive Power Supply.
30 RX_LO_DRIVER Receiver LO Driver Positive Power Supply.
_VCC1
32
TX_MX_IN- Transmit Mixer Negative Input, internally DC coupled, high impedance input. Designed to share a common IF matching
network/IF SAW filter with the receive mixer. Care should be exercised regarding the PC board layout to avoid
interference and noise pickup. Layout symmetry and management of PC board parasitics is also critical for maximizing
the bandwidth of the IF matching network.
33 RX_MX_OUT- Receive Mixer Negative Output, open collector, high impedance output. Designed to share a common IF matching
network/IF SAW filter with the transmit mixer. Care should be exercised regarding the PC board layout to avoid
interference and noise pickup. Layout symmetry and management of PC board parasitics is also critical for maximizing
the bandwidth of the IF matching network.
34 RX_MX_OUT+ Receive Mixer Positive Output, open collector, high impedance output. Designed to share a common IF matching
network/IF SAW filter with the transmit mixer. Care should be exercised regarding the PC board layout to avoid
interference and noise pickup. Layout symmetry and management of PC board parasitics is also critical for maximizing
the bandwidth of the IF matching network.
35
TX_MX_IN+ Transmit Mixer Positive Input, internally DC coupled, high impedance input. Designed to share a common IF matching
network/IF SAW filter with the receive mixer. Care should be exercised regarding the PC board layout to avoid
interference and noise pickup. Layout symmetry and management of PC board parasitics is also critical for maximizing
the bandwidth of the IF matching network.
36
RX_MX_IN Receive Mixer RF Input, internally DC coupled and requires external AC coupling as well as RF matching. The
recommend network consists of a 3.3pF series capacitor followed by a small series inductance of 1.4nH and then a
1.2nH shunt inductor. The series inductance is best implemented on the PC board using a narrow transmission line
inductor.
37
PRE_VCC1 PLL Prescaler Positive Power Supply.
38
ITAT_RES1 Connection to external resistor sets the receive and transmit mixers tail currents, independent of Absolute Temperature.
39
PTAT_RES Connection to external resistor sets the receive and transmit mixers tail currents, proportional of Absolute Temperature.
40 BIAS2_VCC1 Bias Positive Power Supply for the receive and transmit mixers.
41
ITAT_RES2 Connection to external resistor sets the LNA and Preamplifier bias currents, independent of Absolute Temperature.
42
RF_OUT
Low Noise Amplifier RF Output, internally AC coupled and internally matched to 50Ω.
44
COL_OUT LNA Collector Output, requires a bypass capacitance which is resonant with the PC board parasitics. A small resistance
(20Ω) in series with the main PC board VCC bus is recommended to provide isolation from other VCC bypass
capacitors. This ensures the image rejection performance of the LNA is maintained.
All
Others
GND
Circuit Ground Pins (Quantity 6 each).
3
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