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參數(shù)資料
| 型號： | SA1630 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | IF Quadrature Transceiver(IF正交收發(fā)器) |
| 中文描述： | 中頻正交收發(fā)器（中頻正交收發(fā)器） |
| 文件頁數(shù)： | 3/36頁 |
| 文件大小： | 477K |
| 代理商： | SA1630 |
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Philips Semiconductors
Application note
AN2003
SA1630 IF transceiver demonstration board
1999 Jan 05
3
Pin 18 (QTX_IN) and Pin 19 (QTX_INX)
These are the differential Q-channel Tx baseband input pins. These
pins are connected to a 16:1 impedance balun transformer, which
converts the 50
single-ended input at the PCB to the required
differential inputs at the pins. Also, the DC bias point (approximately
V
CC
/2) is connected to these input pins through the secondary
center-tap of the balun. This connection is made at pin 1 of the
connector P2 on the PCB. Capacitors C12 (0.1
μ
F) and
C13 (2.2
μ
F) are ac decoupling caps.
Pin 20 (ITX_IN) and Pin 21 (ITX_IN)
These are the differential I-channel Tx baseband input pins. They
are connected to circuitry identical to that described for pins 18
and 19.
Pin 22 (V
CC
_DIG) and Pin 23 (GND_DIG)
These are the DC supply connections to the internal digital circuity.
Capacitors C14 (0.1
μ
F) and C16 (2.2
μ
F) are ac decoupling caps
and should be placed as close to the IC as possible. This supply is
connected through pin 8 of the P2 connector on the PCB.
Pin 23 (TX_ON)
This pin, together with pin 5 (RX_ON) controls the various different
Tx and Rx operational modes. Capacitor C15 (330 pF) is provided to
smooth out switching transients. A high or low voltage can be
connected to this pin through switch 4 of the 10 switch DIP SW1.
(Note: The OFF position designated on the 10 switch dip package
corresponds to V
CC
, and switch #1 should be in the ON position to
connect V
CC
to the other switches.)
Pin 25 (CLK_INX) and Pin 26 (CLK_IN)
These are the differential reference oscillator inputs. This signal is
brought to the IC single-ended by ac grounding pin 25 with capacitor
C17 (0.01
μ
F). Capacitor C18 (0.01
μ
F) is a DC blocking capacitor,
and R16(51) sets the impedance at the port to 50
to simplify input
power calculations.
Pin 27 (GND_LO)
This pin is connected to the internal ground of the LO circuitry. This
pin should be connected to PCB ground, and as close to the IC as
possible.
Pin 28 (LO_IN) and Pin 29 (LO_INX)
These are the differential local oscillator pins. These pins are
connected to a 4:1 impedance balun transformer through the DC
blocking capacitors C19 (0.01
μ
F) and C20 (0.01
μ
F). R19 (50
)
is
placed at the primary to simplify input power calculations. The
T-network composed of R20, R21 and R22 (all 18
) splits the
power delivered by the VCO evenly between the LO input circuitry
and the SMA connection port when 50
test equipment is present.
Pin 30 (LOCK)
This is the lock detect pin which should light up when lock is
achieved. This pin is also used in test modes to monitor the
comparison frequencies into the phase detector. Capacitor
C22 (0.1
μ
F) is a DC blocking capacitor when this pin is used for this
purpose. Resistor R23 (1 K) is a current limiting resistor to protect
the diode.
Pin 31 (STROBE), Pin 32 (CLOCK), and
Pin 33 (DATA)
These pins are the three wire bus interface used to program the
internal registers. They are connected to pins 1, 2, and 3 of the 6-pin
three wire bus header connector on the PCB. This header is then
connected to the three wire bus interface card on the PC via ribbon
cable.
Pin 34 (V
CC
_CP) and Pin 36 (GND_CP)
These are the internal DC supply connections for the internal phase
detector charge pump circuitry. Capacitors C27 (0.1
μ
F) and
C29 (2.2
μ
F) are ac decoupling caps, and should be placed as close
to the IC as possible.
Pin 35 (CP)
This pin is the phase detector charge pump output. It is connected to
the loop filter composed of resistor R24 (4.7 K) and capacitors
C23 (470 pF) and C24 (4.7 nF). This loop filter is connected to the
704 MHz voltage controlled oscillator through jumper SW2.
Capacitors C25 (0.1
μ
F) and C26 (2.2
μ
F) provide ac decoupling for
the VCO supply line. A jumper is provided to allow an easy way to
break the loop.
Pin 37 (I_REF)
This pin sets the current of the phase detector charge pump output.
This current is set by resistor R25 (51 K). Capacitors C28 (10 pF)
and C30 (10 pF) provide ac decoupling, and should be placed as
close to the IC as possible. The current setting resistor is calculated
according to the equation:
R
ext
(V
CC
_CP
1.6)
31.2
A
(1)
Pin 38 (V_REF)
This pin provides a 2.5 V regulated reference voltage in the two
transmit modes. Test point TP4 is provided for convenient
connection, and C31 (18 nF), R26 (20 K), and R27 (1.6 K) provide
the required load and filtering.
Pin 39 (V
CC
_TXRX), Pin 40 (GND_TXRX), and
Pin 41 (GND_TXRX)
These pins are the DC supply connections to the internal TXRX
circuitry. Pins 40 and 41 should be shorted together and connected
to PCB ground. Capacitors C32 (0.1
μ
F), C33 (2.2
μ
F), and
C34 (0.1
μ
F) are ac decoupling caps, and should be placed as close
to the IC as possible.
Pin 42 (TXIF_OUT) and Pin 43 (TXIF_OUTX)
These pins are the differential transmit open collector outputs.
Inductor L1 (150 nH) is part of the tuned balun circuitry which
resonates out the pin capacitances. R28 (430) decreases the
selectivity of the inductor to preserve wideband operation. The balun
transformer T4 provides a 4:1 impedance transformation, as well as
converting the balanced differential output signal to a single-ended
signal. It also provides a DC connection from V
CC
to the open
collector outputs through the secondary center tap. L2 (22 nH)
brings the Tx output port to 50
, and capacitor C36 (100 pF) is a
DC blocking cap.
Pin 44 (GND_SHL) and Pin 47 (GND_SHL)
These pins are connected to a ground shield internal to the IC.
These pins should be connected to PCB ground as close to the IC
as possible.
Pin 45 (RXIF_INX) and Pin 46 (RXIF_IN)
These are the differential RX IF input pins. Inductor L3 (100 nH) is
part of the tuned balun circuitry which resonates out the pin
capacitances, and the capacitance added by capacitors
C37 (2.7 pF) and C38 (2.7 pF). R29 (5.1 K) decreases the selectivity
of the inductor to preserve wideband operation. The balun
transformer T5 provides a 1:4 impedance transformation as well as
converting the single-ended input signal to a balanced differential
output signal. R30 (0) is a 0
surface mount connection where a
DC blocking cap can easily be added if needed.
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