器件名称: U2797B
功能描述: 1000-MHz Quadrature Modulator
文件大小: 255.15KB 共13页
简 介:TELEFUNKEN Semiconductors
U2797B
1000-MHz Quadrature Modulator
Description
The IC U2797B is a 1000-MHz quadrature modulator that uses TELEFUNKEN’s advanced UHF process. It features a frequency range from 100 MHz up to 1000 MHz, low current consumption, and single-ended RF and LO ports. The I/Q input impedance is about 150 kW. Adjustment free application makes the direct converter suitable for all digital radio systems up to 1000 MHz, e.g., GSM, DAMPS, PDC.
Features
D Supply voltage: 5 V (typical) D Low power consumption: 30 mA / 5 V (typical at D 150 kW I/Q input impedance D Excellent sideband suppression by means of duty
cycle regeneration of the LO input signal –1 dBm output level)
D 50-W single-ended LO and RF port D LO- frequency range of 100 MHz to 1 GHz D SSO 20 package
Benefits
D Extended talk time due to increased battery life D Few external components result in cost and board
space saving
D Phase control loop for precise 90° phase shifting D Power down mode D Low LO input level: –10 dBm (typical)
D Adjustment-free hence saves time
Block Diagram
SPD BBAi BBAi 10 9 8 PD 1 5,6 VS Power 7 down V 13 Ref
14 Duty cycle regenerator 19 Phase adj. 20 LO i BBBi BBBi 11 12
94 8185 e
Frequency doubler
0° 90 °
90° control loop
M
4
RFo
2, 3, 15, 16, 17, 18 GND
Ordeing Information
Extended Type Number U2797B-AFS U2797B-AFSG3 Package SSO20 SSO20 Remarks Rail, MOQ 830 pcs. Tape & reel, MOQ 4000 pcs.
Rev. A1: 06.09.1995
1 (13)
U2797B
Pin Description
SSO 20 PD GND G……