器件名称: U2794B_08
功能描述: 1000-MHz Quadrature Demodulator
文件大小: 923.67KB 共15页
简 介:Features
Supply Voltage 5V Very Low Power Consumption 125 mW Very Good Image Rejection By Means of Phase Control Loop for Precise 90° Phase
Shifting Duty-cycle Regeneration for Single-ended LO Input Signal Low LO Input Level –10 dBm LO Frequency from 70 MHz to 1 GHz Power-down Mode 25 dB Gain Control Very Low I/Q Output DC Offset Voltage Typically < 5 mV
Benefits
Low Current Consumption Easy to Implement Perfect Performance for Large Variety of Wireless Applications
1000-MHz Quadrature Demodulator U2794B
1. Description
The silicon monolithic integrated circuit U2794B is a quadrature demodulator manufactured using Atmel ’s advanced UHF technology. This demodulator features a frequency range from 70 MHz to 1000 MHz, low current consumption, selectable gain, power-down mode, and adjustment-free handling. The IC is suitable for direct conversion and image rejection applications in digital radio systems up to 1 GHz such as cellular radios, cordless telephones, cable TV, and satellite TV systems. Figure 1-1.
VS
5,6
Block Diagram
PU
14
IIX
4
II
3 1 2
IX OUTPUT I
Power down
RFin
7 8
90°Control loop
0° 90°
Frequency doubler
Duty cycle 15 LO regenerator 17 13 PC
12 19 20
PCX Q OUTPUT QX
11
16,18
10
9
GC
GND
QQX
QQ
4653F–CELL–11/08
2. Pin Configuration
Figure 2-1. Pinning SSO20
IX I II IIX V S VS RFin RFXin QQ QQX 1 2 3 4 5 6 7 8 9 10 20 QX 19 18 17 16 15 Q GND LOin GND LOXin
14 PU 13 PC
12 PCX 11 GC
Table 2-1.
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 1……