UPB1008 NEC [NEC], UPB1008 Datasheet - Page 7

• Manufacturer Part Number: UPB1008
• Description: NECs LOW POWER GPS RF RECEIVER
• Manufacturer: NEC [NEC]

PIN FUNCTIONS
Pin No.
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
GNDanalog
DCoffsetIb
DCoffsetI
2IFout-Ib
Mixout2
Mixout1
2IFout-I
Symbol
GNDbb
VCCbb
VCC if
Qmag
Qsign
IF-in1
IF-in2
V
Imag
Isign
AGC
Ground pin of CMOS output driver.
Digitized Q signal. Magnitude bit of 2-bit ADC output.
Digitized Q signal. Sign bit of 2-bit ADC output
Digitized I signal. Sign bit of 2-bit ADC output.
Digitized I signal. Magnitude bit of 2-bit ADC output.
Supply voltage pin of CMOS output driver.
DC offset compensation pin for I-bar arm.
A low pass capacitor shunt to Pin 25 is required.
DC offset compensation pin for I arm.
A low pass capacitor shunt to Pin 24 is required.
Differential output pins of quadrature
demodulator I output. Adding a lowpass shunt
capacitor between these pins will define the
IF bandwidth.
Supply voltage pin of analog portion of the chip.
Gain control voltage pin of IF amplifier. This voltage
performs reverse control,(i.e., V
If this pin is left open, then it is default at
maximum gain.
Differential input pins of 1st IF AGC amplifier
Ground pin of analog portion of the chip.
Differential output pins of RF mixer. This is an emitter
follower output buffer, provide a 50Ω output load.
Function and Application
-15
30
0
0.5
1.5
Typical AGC
Gain Response
AGC
2
up → → → → → gain down).
V
AGC
(V)
Regulator
30
Regulator
29
ESD
ESD
r=21.5
See pin 16 & 17 schematic
See pin 14 & 15 schematic
Internal Equivalent Circuit
r=4k
r=4k
ESD
r=1.42k
ESD
r=5k
18
23
c=1.67p
r=2k
28
32
r=111
c=1.67p
28
32
r=2k
r=1.42k
r=21.5
r=111
r=300
r=3k
r=4k
7
4
To AGC Amp
r=4k
ESD
ESD
ESD
ESD
19, (20,21,22)
ESD
ESD
ESD
ESD
31
34
33