atr2731 ATMEL Corporation, atr2731 Datasheet
atr2731
Available stocks
Related parts for atr2731
atr2731 Summary of contents
Page 1
... Tri-state Phase Detector with Programmable Charge Pump • Superior Phase-noise Performance • Programmable Deactivation of Tuning Output • Three Switching Outputs (Open Collector) • Three D/A Converters (Resolution: 8 Bits) • Lock Status Indication (Open Collector) DAB One-chip Front End ATR2731 Rev. 4904A–DAB–03/06 ...
Page 2
... Description The ATR2731 is a monolithically integrated Digital Audio Broadcasting one-chip front-end circuit manufactured using Atmel’s advanced UHF5S technology. Its functionality covers a gain-con- trolled 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 ...
Page 3
... V AGC x1/x2 D/A D/A 10, 11, 17, 30, 31, 36, 37 4-bit latch Lock detector Programmable charge pump 8-bit latch 8-bit latch MUX D/A D SWC SWB CAO CCO ATR2731 IF 26 AGCIN2 27 IF AGCIN1 21 SLI 22 WAGC 29 IFOUT 20, 25 GND 41 PLCK 8-bit latch D/A 9 CBO 3 ...
Page 4
... Pin Configuration Figure 2-1. Pinning ATR2731 4 SCl 1 44 ADR SDA 2 43 OSCO SWA 3 42 OSCI SWB 4 41 PLCK FREF SWC CAO CCO 8 37 GND CBO 9 36 VCC3 GND 10 35 C2VC GND 11 34 B1VCO RFA1 12 33 B2VCO RFA2 13 32 C1VC ...
Page 5
... Clock (simple two-wire bus) 2 SDA Data (simple two-wire bus) 3 SWA Switching output (open collector) 4 SWB Switching output (open collector) 5 FREF Reference frequency output (for ATR2731) 6 SWC Switching output (open collector) 7 CAO Output of D/A converter A 8 CCO Output of D/A converter B 9 CBO Output of D/A converter C ...
Page 6
... Functional Description The ATR2731 represents a monolithically integrated front-end IC designed for applications in DAB receivers. It covers RF and IF signal processing, the PLL section and also supporting func- tions such as D/A converters or switching outputs. Two RF input ports offer the possibility of handling various input signals such as a down-con- verted L-band signal or band II and band III RF signals ...
Page 7
... Current of Charge Pump SLI X Low High Figure 13-5 on page 12), the active buffer can be selected. The buffers are 40 dBc. – 24. The oscillator's tank is applied to the pins B1VC, Figure 12-1 on page Charge-pump Current [µA] Off 50 (slow mode) 190 (fast mode) 23. ATR2731 6 dBm without – 20. Before 12. This feature 7 ...
Page 8
... CPIF in order to charge or discharge an external capacitor. The current of this charge pump can be selected using the pins WAGC and SLI Table 5-1. The function can be seen in ATR2731 8 “RF AGC Voltage-generation Block” on page (Table Current of Charge Pump ...
Page 9
... Gain-controlled Amplifier/Mixer Combination” on page 21), this oscillator generates a highly stable reference signal external 22), the reference signal has to be applied to the pin OSCI and the pin ATR2731 Figure 6-1. 5000 6000 7000 8000 9000 10000 df/Hz 8, the LO sig- ...
Page 10
... An internal synchronization procedure ensures that such changes do not become active while the charge pump is sourcing or sinking current at its output pin. This behavior allows a smooth tuning of the output frequency without restricting the controlled VCO's frequency spectrum. ATR2731 ...
Page 11
... The output pins CAO, CBO, and CCO must be blocked externally with capacitors (100 nF) as shown in the application circuit (see Figure 12-1 on page 4904A–DAB–03/ --------- - CAj 2 128 --------- - CBj 2 128 --------- - CCj 2 128 20). ATR2731 Table 8-1 on page 12. The output 11 ...
Page 12
... CC7 8.1 Simple Two-wire Bus Functions AS1 TAi TBi TCi CAi, CBi, CCi OS T TRI ATR2731 12 Table 8-1 on page 12, and in 12. The programming information is stored in a set of internal registers. By means 16. Figure 8-1 on page 14 shows a typical two-wire bus pulse diagram ...
Page 13
... Charge-pump Current I100 (nominal) [µA] Low Low High High LO,IFMIX X f LO,IFMIX X IF mixer switched off Low RF mixer A active, f Low RF mixer B active, f High RF mixer B active, f ATR2731 50 100 150 200 Mode = f ref = 2 f ref = f LO,RFMIX VCO = f LO,RFMIX VCO = LO,RFMIX VCO 13 ...
Page 14
... LSB last. Figure 8-1. Two-wire Bus Timing Stop Start SDA t buf SCL t hdsta Figure 8-2. Typical Pulse Diagram START ADDRESS BYTE SDA SCL A BYTE 3 SDA SCL ATR2731 low hddat high sudat ACK A BYTE 1 ACK C BYTE 1 ACK “Electrical Characteristics” on page ...
Page 15
... IFIN V IFAGCIN V OSCI SCL, SDA –0.3 SDA ADR –0.3 SW –0.3 SW PLCK –0.3 PLCK Symbol Value R 40 thJA Symbol Value V 8 –40 to +85 amb ATR2731 Max. Unit +9.5 V 150 °C +150 °C 500 mV rms 500 mV rms 6.75 V 6.25 V 5.5 V 5.5 V 500 mV rms 500 mV rms ...
Page 16
... Type means 100% tested 100% correlation tested Characterized on samples Design parameter Note: 1. The phase detector’s phase-noise contribution to the VCO’s frequency spectrum is determined by the operating frequency of the phase detector divided by 4 according to the fractional-N technique (typically: 16 kHz). ATR2731 16 = 8.5V 25°C ...
Page 17
... Z out,IFOUT 65 + j35 58 – j25 ICPRF 145 180 POS,FM ICPRF –220 –180 NEG,FM ICPRF 30 40 POS,SM ICPRF –52 –40 NEG,FM VAGC 0.75 min ATR2731 Max. Unit Type 1 dBc/Hz D 400 MHz dBm C 60 ...
Page 18
... Type means 100% tested 100% correlation tested Characterized on samples Design parameter Note: 1. The phase detector’s phase-noise contribution to the VCO’s frequency spectrum is determined by the operating frequency of the phase detector divided by 4 according to the fractional-N technique (typically: 16 kHz). ATR2731 18 = 8.5V 25°C ...
Page 19
... T = 25°C S amb Pin 5. – 128 mA, ATR2731 Symbol Min. Typ. Max. I 160 200 240 PD4 I 120 150 180 PD3 I 80 100 120 PD2 ...
Page 20
... ATR2731 20 = 8.5V 25°C S amb Pin 8.5V 100p 3.3n 3.3n 22k 4.7k 2.2k 2.2k BC846B 33k 4.7k BB545 1.2n 27p 2.2p 8.5V 10n 47nH 10n 100p 4.7p 2.2p 2.2p 4. ATR2731 76k 100n 100n 1n 100n 9k RFA RFB Symbol Min. Typ. Max. t 4.7 low t 4 hdsta t 4.7 susta t 4.7 sustp t 0 ...
Page 21
... Application Circuits of the Reference Oscillator Figure 13-1. Oscillator Operation Figure 13-2. Oscillator Overdriven 4904A–DAB–03/06 OSCI 68p 33p OSCO 18p Reference signal OSCI 1n 50 OSCO ATR2731 Reference divider Reference divider 21 ...
Page 22
... Switches 9k 9k 8.5V ATR2730 Pre- selector ATR2731 22 8.5V 100p 3.3n 3.3n 22k 2.2k 2.2k BC846B 4.7k BB545 33k 1.2n 27p 2.2p 8.5V 10n 47nH 100p 4.7p 2.2p 2.2p 4.7p 10n ATR2731 76k 100n 100n 1n 100n 50 9k RFA 1k 4.7k VAGCIF 4.7k 3.3 47n 1.8k 8.5V 100p 10n 10n 10n ...
Page 23
... TCI D/A 4904A–DAB–03/06 V REF IDA TBI D/A AGC_BP AGC_RECT AGC_TP V REF R AGC_COMP AGC_THRESH IDA TAI D/A IFAMP IFMX IFAD VAGC IFAGC1 IFAGC2 CHARGE PUMP CPRF SLI WAGC ATR2731 VAGC,INT SLI WAGC AGCRF voltage CPRF CHARGE PUMP C AGC Antialiasing A/D filter converter R1 R2 AGCIF 23 ...
Page 24
... Figure 13-6. VCO Circuit V Tune 14. Phase-noise Performance (Example: SF spectrum analysis: HP7000) Figure 14-1. Phase-noise Over Frequency 10.00 dB/DIV < -70 dBc/Hz CENTER 270.384 MHz RB 100 Hz VB 100 Hz ATR2731 24 C1VC B2VC B1VC C2VC = 16899 1120, f eff ref,eff ref SPAN 10.00 kHz ST 3.050 sec V V Bias S = 17.92 MHz 200 mA ...
Page 25
... Ordering Information Extended Type Number ATR2731–ILSY ATR2731–ILQY 16. Package Information Package SSO44 Dimensions in mm 0.3 0 4904A–DAB–03/06 Package Remarks SSO44 Tube, Pb-free SSO44 Taped and reeled, Pb-free 18.05 17.80 0.25 0.10 16 ATR2731 9.15 8.65 7.50 7.30 2.35 10.50 10.20 technical drawings according to DIN specifications 0.25 25 ...
Page 26
... Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel’s products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life. © Atmel Corporation 2006. All rights reserved. Atmel marks or trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others. Atmel Operations Memory ...