U2730B-NFSG1 Atmel, U2730B-NFSG1 Datasheet - Page 15

• Manufacturer Part Number: U2730B-NFSG1
• Description: IC DOWN-CONV FOR DAB RCVR 28SSOP
• Manufacturer: Atmel
• Series: U2730r

Specifications of U2730B-NFSG1

• Mfg Application Notes: U2731B
• Rf Type: Broadcast Radio, DAB
• Frequency: 1.4GHz ~ 1.55GHz
• Number Of Mixers: 1
• Package / Case: 28-SSOP
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Voltage - Supply: -
• Gain: -
• Noise Figure: -
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Not Compliant

Application Circuit
for External LO
Signal
4719A–DAB–05/03
With an external LO signal it is possible to overdrive the VCO. In this case, the internal
VCO acts as a LO buffer.
Figure 9. Application Circuit for External LO Signal
Figure 10. Reference Oscillator Operation
Figure 11. Rerference Oscillator Overdriven
Reference signal
Quartz crystal
(50 W signal gen.)
P
ext. LO signal
L1
LO
68 pF
= -10 dBm
33 pF
18 pF
C1
OSCB
OSCB
50
OSCE
OSCE
100 p
1 n
470 nH
TANK
VREF
Reference devider
Reference devider
U2730B-N
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