U2793B_06 Datasheet, PDF (1/13 Pages) ATMEL Corporation – 300-MHz Quadrature Modulator

Features
• Supply Voltage: 5V
• Low Power Consumption: 15 mA/5V
• Output Level and Spurious Products Adjustable (Optional)
• Excellent Sideband Suppression by Means of Duty Cycle Regeneration
of the LO Input Signal
• Phase-control Loop for Precise 90° Phase Shifting
• Power-down Mode
• Low LO Input Level: -15 dBm
• 50-Ω Single-ended LO and RF Port
• LO Frequency Range of 30 MHz to 300 MHz
Benefits
• Low Current Consumption
• Few External Components Result in Cost and Board Space Saving
• Adjustment Free Hence Saves Time
Electrostatic sensitive device.
Observe precautions for handling.
300-MHz
Quadrature
Modulator
U2793B
1. Description
The IC U2793B is a 300-MHz quadrature modulator that uses Atmel^®’s advanced
UHF process. It features low current consumption, single-ended RF ports and adjust-
ment-free application, which makes the device suitable for all digital radio systems,
e.g., GSM, PCN, JDC and WLAN. As an option, output level and spurious products
are adjustable at pins 19 and 20. In conjunction with Atmel’s U2795B mixer, an
up-converter up to 2 GHz can be realized.
Figure 1-1. Block Diagram
10
BB_Ai
9
BB_Ai
14
LO_i
Duty cycle
LO_i ^{15 regenerator}
Frequency
doubler
0°
90°
90° control
loop
S_{PD PU}
8
1
Power _6,7 ^VS
up
13 ^VRef
19
LP2
LP1
20
Σ
4 ^RFo
BB_{Bi 11}
BB_{Bi 12}
3,16,17,18
GND
2 ^ACGND
5 ^ACGND
4651E–CELL–07/06