VA 31 20 VD LOUT/ 32 19 VIO1 MPXOUT ROUT 33 18 INTB/DFS2 RCLK/ 34 17 SCL XTAL2 XTAL1 35 16 SDA DACREF 36 15 RSTB 37 14 GPIO2 NC/DOUT2 GPIO1 38 13 NC/DCLK2 FMAGC2 39 12 A1/INTB 40 11 FMAGC1 A0 Si4770/77-A20 HIGH-PERFORMANCE CONSUMER ELECTRONICS BROADCAST RADIO RECEIVER AND HD RADIO TUNER Features Worldwide FM band support AM/FM hi-cut control (64108 MHz) AM lo-cut filter Worldwide AM band support 2 L/R analog and digital (I S) audio (5201710 kHz) outputs AM/FM HD Radio support Digital Low-IF architecture (Si4777 only) Frequency synthesizer with fully Comprehensive signal quality integrated PLL-VCO metrics: RSSI, SNR, multipath Fully integrated AM/FM front-end Ordering Information: interference, frequency offset, including high performance LNA, adjacent channel RSSI, See page 49. AGC with integrated resistor and frequency deviation, and image capacitor banks, and RF and IF RSSI peak detectors Pin Assignments Advanced patented RDS soft- Integrated crystal oscillator decision decoder 2 Digital (I S) Zero-IF AM/FM I/Q Advanced, patented FM channel Si4770/77-A20 outputs (Si4777 only) equalizer for multipath interference 1.2 to 5 V power supplies QFN 40-pin, 6x6x0.85 mm Dynamic AM/FM channel bandwidth control 1 30 Pb-free/RoHS compliant NC NC/BLEND FMXIP 2 29 DCLK Programmable AM/FM soft mute FMXIN 3 28 DFS RFGND 4 27 DOUT FM stereo-mono blend RFREG 5 26 NC/QOUT GND PAD FM hi-blend control FMO 6 25 NC/IOUT FMI 7 24 NC/IQFS 8 23 NC NC/IQCLK Applications NC 9 22 VIO2 AMI 10 21 DBYP Audio/video receivers Boom boxes Consumer electronics Home theater systems Description Patents pending The Si4770/77-A20 broadcast receiver and HD Radio tuner (Si4777 only) employs an advanced, proven digital low-IF architecture to bring outstanding receiver performance to high-performance consumer electronics. Rev. 0.9 6/12 Copyright 2012 by Silicon Laboratories Si4770/77-A20 This information applies to a product under development. Its characteristics and specifications are subject to change without notice.Si4770/77-A20 Functional Block Diagram Si4770/77 LOUT/ ADC DAC FMXIP MPXOUT DSP IF PKD RF PKD FMXIN ADC DAC ROUT RFREG REG R L DCLK DFS LNA FMO 0/90 DOUT FMI RDS RF PKD RF PKD INTB AMI LNA RSTB CNTRL ClK Gen VIO1 RFGND VIO2 2 Rev. 0.9 FMAGC1 FMAGC2 XTAL1 XTAL2/ RCLK IQFS IOUT A0 QOUT A1 IQCLK SDA SCL