器件名称: U2781B-AFSG3
功能描述: Frequency Synthesizer
文件大小: 198.88KB 共10页
简 介:U2781B
Frequency Synthesizer
Description
The programmable frequency synthesizer IC U2781B for P-controlled application is realized with TEMIC’s advanced UHF process which is very suitable for combinations of fast ECL logic and low-current I2L logic. The benefits are high input sensitivity in connection 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 D D D D D D D D
Very low current consumption (typ. 3 V/ 5 mA) Supply voltage range: 2.7 to 5.5 V Max. input frequency: 1.1 GHz Programmable prescaler 64/ 65 or 128/ 129 Controlled by 3-wire bus with fclock up to 500 kHz Status output for PLL lock/ unlock condition Very fast phase detector SSO20 package 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 1 3 5 7 1-bit latch load control 18-bit shift register Phase detector Charge pump 15-bit latch Oscillator 14-bit reference counter Mo 17 LDo 8 VSCP 4 CP 6
Clock 11 Data 13 Enable 14
18-bit latch Prescaler 64/65 128/129 7-bit swallow counter 11-bit main counter
15
PS
RFi 10
93 7785 e
Figure 1. Block diagram
Ordering Information
Extended Type Number U2781B-AFS U2781B-AFSG3 Package SS020 SS020 Remarks Rail, MOQ 8……