U2893B Datasheet, PDF (11/14 Pages) TEMIC Semiconductors – Modulation PLL for GSM, DCS and PCS Systems

Application Circuit (900 MHz)
Baseband processor
U2893B
2.7 to 3.5 V
27n
12p 12p
I NI MDLO Q NQ PUMIX PU ^MIXO
LO (–10 dBm)
1192 MHz
MIXLO
Dr Dr
4.7p MDO
NMDO
47nH
ND
1k ^NND
RD
f_Ref
v_rms = 55 mV ⁵⁰
NRD
MC
90
grd
+
I/Q modulator
N:1
divider
MUX
R:1
divider
Mode
control
GND
Voltage
reference
Mixer
PFD
U2893B
RF
NRF
VSP
50
390
6 dB ^{To PA}
attn.
VCO MQE 550
2.7
to 3.5 V 10
CPO
68p
VS1
VS2
VS3
3.3n
390
2.7 to 3.5 V
CPC
GNDP
13316
Figure 16. Power-up, charge pump control, and mode control must be connected according to the application used
TELEFUNKEN Semiconductors
Rev. A1, 29-Jan-97
Preliminary Information
11 (14)