AN6454SH

AN6454SH Pager Direct Conversion FSK Demodulator Mixer IC s Overview The AN6454SH supports direct conversion FSK demodulation for pagers, and incorporates two mixers. Unit : mm s Features • Low current consumption : 1mA • Incorporates two mixers. 450MHz input frequency. • Small surface-mount package with 0.5mm pitch. 0.5 1 5 10 6 0.2±0.1 0.1±0.1 0.625±0.10 0.5±0.2 4.3±0.3 6.3±0.3 SOP package with 10 pins (SSOP010-P-0225) s Pin Descriptions Pin No. 1 2 3 4 5 Description MIX bias L–OSC input (1) L–OSC input (2) MIX current control VCC Pin No. 6 7 8 9 10 Description MIX (2) output MIX (1) output GND RF bias RF input s Functional Block Diagram MIX bias L-OSC input (1) L-OSC input (2) MIX Current Control VCC 1 2 3 4 5 BIAS MIX1 10 9 8 7 6 RF input RF bias GND MIX (1) output MIX (2) output MIX2 0.15 +0.1 –0.05 0.625±0.10 1.5±0.2 3.0±0.3 s Absolute Maximum Ratings (Ta=25˚C) Parameter Supply voltage Supply current Power dissipation Operating ambient temperature Storage temperature Symbol VCC ICC PD Topr Tstg Rating 4 20 143.5 (Ta=75˚C) –20 to + 70 –55 to +125 Unit V mA mW ˚C ˚C Note) Protect pins 3, 9, and 10 from electrostatic discharge. s Recommented Operating Range Parameter Operating supply voltage range Symbol VCC Range 1.8 to 3V s Electrical Characteristics (VCC=2.0V, Ta=25±2˚C) Parameter Current consumption MIX output level (1) MIX output level (2) Symbol Itot VMIX1 VMIX1 Input Level –54dBm, f=450.0045MHz Input Level –54dBm, f=450.0045MHz Condition min 0.6 –38 –38 typ 1.0 –34 –34 max 1.4 –30 –30 Unit mA dBs dBs s Electrical Characteristics (Design Values for Reference) (VCC=2.0V, Ta=25±2˚C) The following are design values for reference only (not guaranteed) Parameter RF bias voltage MIX bias current MIX output level difference Output noise level Symbol VRF VMIX DVmix Vn3 DVmix=Vmix1–Vmix2 Vn3= (Vn2)2 + (Vn2)2 2 –3.2 Condition min typ 0.745 1.3 3.2 25 max Unit V V dB dBs s Pin Descriptions Pin No. Symbol Description Equivalent circuit 1 MIX bias Local oscillator bias. Normally grounded though a capacitor. 2 3 VCC 12kΩ 1 2 L-OSC input 1 Local oscillator inputs to Pin2 w and 3 are different in phase by π/2. These inputs are different in frequency by FM Dev from Pin 10 input. 3 L-OSC input 2 4 4 MIX-current control Current input to this pin controls the IC's operation and total current. This pin may be connected to Pin 22 of AN6400. 2.4kΩ 2.4kΩ 5 VCC This is the supply voltage pin. VCC 6 MIX2 output 100Ω 6 Direct-conversion mixer outputs (FM Dev.). These outputs are different in phase by π/2 from each other. These pins may be to AN6400 or other direct conversion demodulator ICs for data retrieval. VCC 7 MIX1 output 100Ω 7 s Pin Descriptions (Cont.) Pin No. 8 GND Symbol Description This is the ground pin. Equivalent circuit 9 RF bias This is the bias pin for RF input to Pin 10. The bias us internally provided. This pin must be ground through a capacitor. 10 9 VCC 1.2kΩ 1.2kΩ 10 RF input FSK-modulated RF signals from an RF amplifier are input to this pin. RF signals with up to 450MHz are acceptable.