SA638 データシートの表示（PDF） - Philips Electronics
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SA638 Datasheet PDF : 5 Pages
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Philips Semiconductors
IS-54 IF receiver
Preliminary specification
SA638
PIN DESCRIPTIONS
Pin
No.
Mnemonic
Function
1
RFIN(+)
RF Input Plus: Differential RF Plus input to mixer.
2
RFIN(–)
RF Input Minus: Differential RF Minus input to mixer.
3
OSCB
LO Oscillator Transistor Base: LO generator (Pins 3 and 4) with internal buffer to drive mixer differentially. Can
also be driven externally.
4
OSCE
LO Oscillator Transistor Emitter: Pins 3 and 4 are used to form an oscillator with external components (tank,
varactor, etc.).
5
VCC1
Supply Voltage 1: Voltage supply for mixer and main bias.
RSSI Out and AGC Input: Dual use: RSSI output in AMPS mode (no internal opamp) and AGC input in QPSK
6
RSSI/AGC
mode if needed. If no AGC, input will auto AGC to pre-defined fixed level for IQ outputs, in which case this pin
also serves as RSSI output.
7
PWRDWN
Power-Down: Chip power-down input (CMOS compatible).
8
OSCDEMOD
IF Oscillator Input (LO frequency x4): Oscillator input x4 for I/Q demodulation is needed for internally
generating quad LOs by division.
9
ModeSW
Mode Switch: Logic control signal to select between AMPS and QPSK modes of operation.
10
AUDIO/LPF
Audio Out and LPF Corner Frequency Control: Dual Use: Audio output in the AMPS mode and LPF corner
frequency control in QPSK mode.
11
DEMOD1
Demod Auxiliary Pin: Used to implement FM demodulation in AMPS mode.
12
Q
Baseband Q Ouptut: Quadrature baseband output referenced to IQREF.
13
I
Baseband I Output: In-phase baseband output referenced to IQREF.
14
VCC2
Supply Voltage 2: Voltage supply for IF amp and demodulator.
15
IQREF
I/Q Reference Voltage: Reference voltage for baseband I/Q outputs.
16
GND2
Ground 2: Ground common for IF amp and demodulator.
17
DEMOD2/Offsets
Demod Auxiliary Pin and I/Q Offset Control: Dual Use: In AMPS mode serves for FM demodulator; in QPSK
mode serves as I/Q offset control.
18
IQ DEMOD Input to the Demodulator: IF input to demodulator from AGC IF amp output.
19
GND1
Ground 1: Ground common for mixer and main bias.
20
IFAMPOUT
IF Amplifier Output: IF amplifier output.
21
VCCMID
VCC Midpoint Bypass: The internally generated VCC midpoint bias needs to be externally bypassed with a
suitable capacitor.
22
IFAMPIN
Input to IF Amplifier: Input to IF Amplifier from mixer through external filter.
23
IFAMPDC
Reference Input to IF Amp: External bypassing for low frequency feedback of IF amp to null DC offsets.
24
MIXOUT
Output from Mixer: IF output from mixer to external BPF and IF amp.
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
VCC
Single supply voltage
VIN
Voltage applied to any other pin
TSTG
TA
Storage temperature range
Operating ambient temperature range SA639
NOTE: θJA Thermal impedance (DH package) 117°C/W
RATING
UNITS
V
V
°C
°C
1995 Feb 16
2
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