LTC2604/LTC2614/LTC2624
16
2604fd
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2004
LT 0309 REV D • PRINTED IN USA
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC1458/LTC1458L Quad 12-Bit Rail-to-Rail Output DACs with Added Functionality LTC1458: V
CC
= 4.5V to 5.5V, V
OUT
= 0V to 4.096V
LTC1458L: V
CC
= 2.7V to 5.5V, V
OUT
= 0V to 2.5V
LTC1654 Dual 14-Bit Rail-to-Rail V
OUT
DAC Programmable Speed/Power
LTC1655/LTC1655L Single 16-Bit V
OUT
DAC with Serial Interface in SO-8 V
CC
= 5V(3V), Low Power, Deglitched
LTC1657/LTC1657L Parallel 5V/3V 16-Bit V
OUT
DAC Low Power, Deglitched, Rail-to-Rail V
OUT
LTC1660/LTC1665 Octal 8-Bit/10-Bit V
OUT
DAC in 16-Pin Narrow SSOP V
CC
= 2.7V to 5.5V, Micropower, Rail-to-Rail Output
LTC1821 Parallel 16-Bit Voltage Output DAC Precision 16-Bit Settling in 2μs for 10V Step
LTC2600/LTC2610/LTC2620 Octal 16-Bit/14-Bit/12-Bit Rail-to-Rail DACs in 16-Lead SSOP 250μA per DAC, 2.5V to 5.5V Supply Range
LTC2602/LTC2612/LTC2622 Dual 16-Bit/14-Bit/12-Bit Rail-to-Rail DACs in 8-Lead MSOP 300μA per DAC, 2.5V to 5.5V Supply Range
TYPICAL APPLICATION
0°
90°
I + Q
MODULATOR
RF
LO
Q INPUT
I INPUT
5V
5V
5V
5V
70MHz IN
OUT
1k
10k
10k
1k
10k
10k
20k
0.1μF
0.01μF
0.01μF
20Ω
49.9Ω
49.9Ω
49.9Ω
ZC830
ZC830
47pF
10pF
20pF
*ZETEX (516) 543-7100
OPTIONAL
5V
5V
LTC2604
CS/LD
SCK
SDI
DAC D
DAC B
OPTIONAL
DAC C
DAC A
0.1μF
0.1μF
20k
100k
2.74k
1%
2.74k
1%
2.74k
1%
2.74k
1%
100k
2.74k
1%
2.74k
1%
2.74k
1%
2.74k
1%
0.1μF
2604 F04
Figure 4. Using DAC A and DAC B for Nearly Continuous Attenuation Control and DAC C and
DAC D to Trim for Minimum LO Feedthrough in a Mixer
