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U2781B Datasheet

Frequency Synthesizer

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Frequency Synthesizer
U2781B
Description
The programmable frequency synthesizer IC U2781B for
µP-controlled applications is realized with Atmel
Wireless & Microcontrollers’ advanced UHF process
which is very suitable for combinations of fast ECL logic
and low-current I2L logic. The benefits are high input
sensitivity combined with low power consumption and
therefore small packages (SSO20). This makes the
device a perfect choice for cordless phones and handheld
cellular radio sets up to 1.1 GHz.
Electrostatic sensitive device.
Observe precautions for handling.
Features
D Very low current consumption (typ. 3 V/ 5 mA)
D Supply-voltage range: 2.7 to 5.5 V
D Max. input frequency: 1.1 GHz
D Programmable prescaler 64/ 65 or 128/ 129
D Controlled by 3-wire bus with fclock up to 500 kHz
D Status output for PLL lock/ unlock condition
D Very fast phase detector
D SSO20 package
D ESD protection in accordance with MIL-STD. 883
method 3015 class 2
Benefits
D Very low current consumption extends talk time
D Few external components and SSO package save costs
and space
Block Diagram
Osci
Osco
VS
GND
Clock
Data
Enable
1
3
5
7
11
13
14
Oscillator
1-bit latch
load control
RFi
10
Prescaler
64/65
128/129
14-bit
reference counter
15-bit latch
18-bit
shift register
18-bit latch
7-bit
swallow
counter
11-bit
main
counter
Phase
detector
Charge
pump
Mo
17
LDo
8
VSCP
4
CP
6
15 PS
U2781B
Figure 1. Block diagram
Rev. A4, 11-Sep-00
1 (10)
Atmel
Atmel



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