MAX1474 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Miniature Electronically Trimmable Capacitor

19-1948; Rev 1; 3/01
Miniature Electronically Trimmable Capacitor
General Description
The MAX1474 is a fine-line (geometry) electronically trim-
mable capacitor (FLECAP) programmable through a
simple digital interface. There are 32 programmable
capacitance values ranging from 6.4pF to 13.3pF in
0.22pF increments (Table 1). The quartz dielectric
capacitance is highly stable and exhibits a very low volt-
age coefficient. It has virtually no dielectric absorption
and has a very low temperature drift coefficient
(<33ppm/°C). The MAX1474 is programmed through two
digital interface pins, which have Schmidt triggers and
pulldown resistors to secure capacitance programming.
Customization
Maxim can customize the MAX1474 for specific high-
volume applications. Contact Maxim for further informa-
tion.
Applications
Post-Trim of Low-Cost Regenerative Receivers
Tunable RF Stages
Low-Cost, Low-Temperature Drift Oscillators
Garage Door Openers
Keyless Entry
Industrial Wireless Control
Capacitive Sensor Trimming
RFID Tags
Pin Configuration
Features
o Tiny SC70 Package (1.1mm x 2.2mm x 2.4mm)
o High-Performance Electronically Trimmable
Capacitance
o Very Simple Digital Interface
o Eliminates the Need for Mechanical Tuning
o Enabling Technology for Low-Cost Production
Line Automation
o Fully Static Operation After Programming
(No Switching)
Ordering Information
PART
TEMP. RANGE ^PIN-
PACKAGE
MAX1474AXT-T -40°C to +125°C 6 SC70-6
TOP
MARK
AAT
Functional Diagram
CP
6pF
0.2pF
0.4pF
0.8pF
CM
6pF
TOP VIEW
MAX1474
CP 1
6 CM
V_DD 2
5 V_SS
EN 3
4 DAT
SC70
1.6pF
V_DD
V_SS
3.2pF
EN
LOGIC INTERFACE
DAT
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.