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U2730B-NFSG1, U2731B, U2731BMFN

Table of contents:
Info of U2730B-NFSG1
Info of U2731B
Info of U2731BMFN

U2730B-NFSG1, U2731B, U2731BMFN Selling Leads, Datasheet

MFG:Atmel Category:RF and RFID Package Cooled:28-SSOP D/C:09+

U2730B-NFSG1, U2731B, U2731BMFN Datasheet download

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Part Number: U2730B-NFSG1

Category: RF and RFID

MFG: Atmel

Package Cooled: 28-SSOP

D/C: 09+

Description: IC DOWN-CONV FOR DAB RCVR 28SSOP

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U2730B-NFSG1 Parameters

Technical/Catalog Information	U2730B-NFSG1
Vendor	Atmel
Category	RF and RFID
RF Type	DAB, Broadcast Radio
Package / Case	28-SSOP
Frequency	1.4GHz ~ 1.55GHz
Features	DQPSK Modulation
Packaging	Tape & Reel (TR)
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	U2730B NFSG1 U2730BNFSG1

U2731B General Description

The U2731B is a monolithically integrated Digital Audio Broadcasting one-chip front end circuit manufactured using Atmel's advanced UHF5S technology. Its functionality covers a gain-controlled RF amplifier with two selectable RF inputs, a gain-controlled RF mixer, a VCO which provides the LO signal for the RF mixers, either directly or after passing a frequency divider, a SAW filter driver, an AGC block for the RF section, a gain-controlled IF amplifier, an IF mixer which can also be bypassed, an AGC block for the IF section and a fractional-N frequency synthesizer. The frequency synthesizer controls the VCO to synthesize frequencies in the range of 70 MHz to 500 MHz in a 16-kHz raster; within certain limits the reference divider factor is fully programmable. The lock status of the phase detector is indicated at a special output pin; three switching outputs can be addressed. A reference signal which is generated by an on-chip reference oscillator is available at an output pin. This reference signal is also used to generate the LO signal for the IF mixer, either by doubling the frequency or by using the reference frequency itself. Three D/A converters at a resolution of 8 bits provide a digitally controllable output voltage. The thresholds inside the AGC blocks can be digitally controlled by means of on-chip 4-bit D/A converters. All functions of this IC are controlled via a simple two-wire bus.

U2731B Maximum Ratings

Parameters	Symbol	Min.	Max.	Unit
Supply voltage	V_S	-0.3	+9.5	V
Junction temperature	T_j	-40	150	°C
Storage temperature	T_stg		+150	°C
Differential input RF amplifier, pins 12 and 13	V_RFA1,2		500	mV_rms
Pins 14 and 15	V_RFB1,2		500	mV_rms
Externally applied voltage at RF charge pump output, pin 16	V_CPRF	0.5	6.75	V
Pin 28	V_CPIF	0.5	6.25	V
WAGC input voltage, pin 22	V_WAGC	-0.3	5.5	V
SLI input voltage, pin 21	V_WAGC	-0.3	5.5	V
Differential base input VCO, pins 33 and 34	V_BiVC		500	mV_rms
Differential input IF amplifier, pins 23 and 24	V_IFIN		500	mV_rms
Differential input IF AGC block, pins 26 and 27	V_IFAGCIN		500	mV_rms
Reference input voltage (AC), pin 42	V_OSCI		1	Vpp
Two-wire bus input/output voltage, pins 1 and 2	SCL, SDA	-0.3	5.5	V
SDA output current, pin 2	SDA		5	mA
Address select voltage, pin 44	ADR	-0.3	5.5	V
Switch output voltage; pins 3, 4 and 6	SW	-0.3	9.5	V
Switch output current	SW		4	mA
PLCK output voltage, pin 41	PLCK	-0.3	5.5	V
PLCK output current, pin 41	PLCK		0.5	mA

U2731B Features

• 8.5 V Supply Voltage
• Voltage Regulator for Stable Operating Conditions
• Microprocessor-controlled Via a Simple Two-wire Bus
• Two Addresses Selectable
• Gain-controlled RF Amplifier with Two Inputs, Selectable Via a Simple Two-wire Bus Control
• Balanced RF Amplifier Inputs
• Gain-controlled RF Mixer
• Four-pin Voltage-controlled Oscillator
• SAW Filter Driver with Differential Low-impedance Output
• AGC Voltage Generation for RF Section, Available at Charge-pump Output (Can Also Be Used to Control a PIN Diode Attenuator)
• Gain-controlled IF Amplifier
• Balanced IF Amplifier Inputs
• Selectable Gain-controlled IF Mixer
• Single-ended IF Output
• AGC Voltage Generation for IF Section, Available at Charge-pump Output
• Separate Differential Input for the IF AGC Block
• All AGC Time Constants Adjustable
• AGC Thresholds Programmable Via a Simple Two-wire Bus
• Three AGC Charge Pump Currents Selectable (Zero, Low, High)
• Reference Oscillator
• Programmable 9-bit Reference Divider
• Programmable 15-bit Counter 1:2048 to 1:32767 Effectively
• Tristate Phase Detector with Programmable Charge Pump
• Superior Phase-noise Performance
• Deactivation of Tuning Output Programmable
• Three Switching Outputs (Open Collector)
• Three D/A Converters (Resolution: 8 Bits)
• Lock Status Indication (Open Collector)

U2731B Connection Diagram

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