AD7371JN

ANALOGDEVICES fAX-ON-DEMAND HOTLINE - Page 28 LC2MOS ANALOG LIllIDEVICES VoicebandReconstruction andAntialiasing FilterSet AD7341/AD7371 I I FEATURES AD7341 Transmit (Reconstruction) Filter for 14-Bit DAC (AD7840) Programmable Attenuation (OdB to -38dB) AD7371 Receive Filter for 14-Bit ADC (AD7871) Programmable Gain (OdS to 24dB) 7OdB Stopband Attenuation 75dB In-Band Signal-to-Noise Ratio Better Than 75dB Total Harmonic Distortion CCITT V.32 and V.33 Compatible Small. 0.3". 24-Pin Plastic Package and 28-Pin PLCe - FUNCTIONAL OPO OP1 - BLOCK DIAGRAMS v" v~. rXIN AD7341 - OBS OLE S'lNCOiJT { J GENERAL DESCRIPTION The AD7341 and AD7371 are reconstruction and antialiasing fLltersdesigned for use in high speed voiceband modems with speeds up to 14.4 kbitslsec) in accordance with CCITT V.32 and V.33 recommendations. These Hlters, along with the AD7840 DAC) the AD7871 ADC and a digital signal processor (DSP) can be used to implement a complete modern. 01'0 OP1 The AD7341 is the transmit or reconstruction ftlter. It implements the filter function using a seventh order low pass switched capacitor filter and a second order low pass continuous time filter. The cutoff frequency is 305kHz. The AD7371 is the receive fIlter. It is a high order bandpass fLlterwith a lower cUtoff frequency of 180Hz and an upper cutoff frequency of 3.5kHz. The ftlter function is implemented using a second order low pass continuous time fIlter, a fourth order high pass switched capacitor fIlter and a seventh order low pass switched capacitor fIlter. TE Vco Va. RXIN SVNCOUT (3 AD7371 oso OS; OS2 REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implicationor otherwise under any patent or patent rights of Analog Devices. One Technology Way, P,O. Box 9106, Norwood, MA 02062-9106 Tel: 617/329-4700 Fax: 617/326-8703 Twx; 710/394-6577 West Coast Central Atlantic 714/641-9391 214/231-5094 215/643-7790 - Page ANALOG DEVICES fAX-ON-DEHAND HOTLINE 29 AD7341/AD7371-SPECIFICATIONS -' = = = = Vee 5V ::f:5%; Vss -5V ::f: 5%; AGND DGND= OV;ClKIN= 288kHz(MIS Ratio set at OdB,unlessotherwise stated,) 60/40. TA +25DC. Attenuator 1 (VDD FILJER TRANSMIT = .-..--. AD734lJN AD7341JP Parameter Units INPUT CHARACTERISTICS :t3 Input Signal Range 100 Input Impedance FILTER CHARACTERISTICSz, 3 , i 288 CLKIN Frequency 3.5 Cutoff Frequency -80 Second Harmonic -80 Third and Higher Harmonics 0.4 Passband Ripple :to.5 Passband Gain Error Stopband Rejection Differential Group Delay OUTPUT CHARACTERISTICS Output Voltage Offset: Voltage Attenuation Range Relative Accuracr' 4 Output Resistance LOGIC INPUTS WR, DB2-DB7, DPO, DPl, DS(}-DS2, SYNCIN, CLKIN VINH, Input High Voltage VINL' Input Low Voltage IINH' Input Current CJN, Input Capacitance CLKIN Divider Range (Nl)5 72 75 70 70 350 :!:3 :t70 0 to -38 :!:O.l 0.2 2.0 0.8 10 10 1 to 4 kHz kHz dB typ dB typ dB Max dB max dB min dB typ dB typ dB mm fLstyp VDD Vec Vss IDD + Ice Iss Power Dissipation I to 8 fcLKIN/(NIX5xN2) lIfa.KtN 2.4 0.4 4.75/5.25 4.7515.25 -4.751-5.25 25 25 265 Test Conditions/Comments Nl = 1 (i.e., DPO= 1, DPl =0) O.ldB Down from the Lowest Point in the Passband O:5fs3.3kHz Deviation from Nominal Setting on Programmable ; Attenuator 0:5fs3.5kHz SNR Includes Noise and Harmonics Attenuator Set at - 3OdB, O:5f:53.5kHz f~6.lkHz 0:5fs3.3kHz and Referenced to the AbsolUte Group Delay at 1kHz OLE Vmax mV max dB dBtyp n typ RL = 3kfl, CL = lOOpF Determined by DB2-DB7, See Table III TE Vmin Vmax I-LAmax pF Max CLKIN Can Be Set to 288kHz, 576kHz, 864kHz or 1.152MHz. NI Is Set by DPO, DPl. LOGIC OUTPUTS SYNCOUr Divider Range (N2) Frequency Pulse Width VOH' Output High Voltage VOL' Output Low Voltage POWER SUPPLIES -- Vmax Mn typ OBS Signal-to-Noise Ratio = 40/60to N2 Is Set by DS(}-DS2. kHz fLS Vmm Vmax IsOURCE = 4OOfLA IS1NK=--1.6mA V min/V roax V minN max V minN max mA Max IDAMax roW max NOTES . IOperating temperatUre ranges as follows: J versions: 0 to + 70.C. zSpedfied fur an input frequency of 288kHz. This is internally divided by 5 to produce a switched capacitor filter frequency of 57. 6kHz. For input &equencies lower than 288kHz, the filter response is shifted down by the ratio of this input frequency to 288kHz. 'Measured using a :r3V, 1kHz sine wave. 'Measured over the full attenuation range. ~Required to derive internal frequency of 288kHz from CLKIN. 6Detennined by data transmission rate. Spedfications subj~t to change without notice. -2- REV. A - Page ANALOG DEVICES fAX-ON-DEMAND HOTLINE ' ' RECEIVEFIL JER o 30 AD7341/AD7371 = Vee= 5V:t: 5%; Vss= -5V :!:: 5%;AGND= DGND = OV;CLKIN= 288kHzMISRatio= 40/60to 60/40.TA = +25°C.PGAsetat OdD,unlessotherwise stated.) (VOII ,..., AD7371JN AD7371JP Parameter Units Test Conditions/Comments " INPUT CHARACTERISTICS Input Signal Range Input Impedance ::':3 10 "" FILTER CHARACTERISTICS2, , . 3 CLKIN Frequency Lower Cutoff Frequency Upper Cutoff Frequency Second Harmonic Third and Higher Harmonics Passband Ripple Passband Gain Error Signal-to-Noise Ratio 288 180 3.5 80 -80 0.4 :to.S 72 75 60 66 40 360 OBS Stopband Rejection Differential Group Delay OUTPUT CHARACTERISTICS Output Voltage Offset Voltage Gain Range Relative Accuracy3, 4 Output Resistance :t3 ::':70 0 to +24 :to.1 0.2 LOGIC INPUTS WR, DBO-DB7,DPO,DPl, 2.0 VINl.>Input Low Voltage lINn, Input Current 0.8 10 CIN' Input Capacitance CLKIN Divider Range (NI)s LOGIC OUTPUTS SYNCOUT Divider Range (N2) Frequency Pulse Width V on, Output High Voltage VOL> Output Low Voltage kHz Hz kHz dB typ dB typ dB max dB max dB min dB typ dB typ dB min dB typ fLSryp NI=! (i.e., DPO=I, DPl=O) O.ldB Down from the Lowest Point in the Passband O.ldB Down from the Lowest Point in the Passband 200Hzsf:-s3.3kHz DeviatIon from Nominal Setnng on PGA 180Hz:-Sf:-S3.5kHz InpUt Signal Level of -24dB; PGA Gain Set at +24dB f6.1kHz f60kHz SOOHzsfs3.3kHz and Referenced to the AbsolUte Group Delay at 1kHz OLE Vmax mV max dB 10 1 to 4 Determined Vmin Vmax fLAmax I I i pF max II 4.75/5.25 4.75/5.25 -4.75/-5.25 25 25 265 VDD Vc.c Vss Inn + Ice Is5 Power Dissipation non CLKIN Can Be Set to 288kHz, 576kHz, 864kHzor i --- N2 Is Set by DSO-DS2. ; fLS i V min Vmax ! IsouRcE=400fLA ' ISINK SUPPLIES see Table VI I 1.152MHz. Nl Is Set by DPO, DP1. 1 to 8 kHz TE by DBO-DB7, dB typ !1 typ -- fCLKIN/eNI xSxN2) l/fcLKIN 2.4 0.4 -".'..", RI,. = 3k!1, Cl. = 100pF I! DSO-DS2, SYNCIN, CLKIN VINH' Input High Voltage POWER V max kD typ = 1.6mA mm'.m- V minIV rnax V minIV max V minN max mA max mA max mW max NOTES 'Operating temperature ranges as follows: J versions: '0 to +70'C. 'Specified for an input frequency of 288kHz. This is inrernaJly divided by 5 to produce a swirched capacitor tjltc:r frequency of 57.6kHz. For inpUt frequencies lower than 288kHz, the filter response is shifted down by the ratio of this input frequency to 288kHz. 'Measured using a :t3V, 1kHz sine wave. 'Measured over the full attenuation range. 'Required to derive a switched capacimr filter frequency of 288kHz from CLKIN. 'Determined by dara transmission rate. Specifications subject to change without notice. REV. A -3- ANALOG DEVICES fAX-ON-DEMAND HOTLINE - Pag!! 31 AD7341/AD7371 TIMINGCHARACTERISTICS1 (VDD = Vee = +5V %5%. Vss = -5V 1 %5%) 080..087 Parameter Limit at TA +2S0C Umts Comments tWR 80 ns min Write Pulse Width 60 20 80 ns min ns min ns min Data Setup Time Data Hold Time SYNCIN Pulse Width tDS tDH tSYNCJN = 1 I a. 1 WR ""'" Operating Temperature Range JVersions t- .;--=.: 5V :~//////~ .. ov I I I I I I r '\. I 5V OV NOTES ,. ALL INPUT SIGNAL RISE AND FAll of +5V 1'~t1~20~.. 2. TIMING MEASUREMENT TIMES MEASURED FROM 10% 10 90% REFERENCE LEVEL IS IV," . V~112 Figure 1. AD7341/AD7371 ABSOLUTE MAXIMUM RATINGS. VootoAGND :..-O.3Vto+7V VcctoDGND O.3Vto+7V VDDtoVcc O.6Vto+O.6V VsstoDGND +O.3Vto-7V AGNDtoDGND O.3VtoVcc RXIN, TXIN to AGND Vss -O.3V to VDD + O.3V RXOUT, TXOUT to AGNDt ...Vss-O.3V to VDD + O.3V Digital Input Voltage to DGND . . . . . . -O.3V to Vcc + O.3V Power Dissipation(Any Package)to +75°C DATA VAUO :/,///////.J( NOTE 'Timing specifications are sample tested at +2S.C to ensure compliance. All input control signals are specified with tR = t,,= lOns (10% to 90% of +SV) and timed from a voltage level of + 1.6V. Specifications subject to change without notice. OBS : 10"I 10. a. 1 I Timing Diagram StorageTemperature Range. . . . . . . . . . . -65°C to + 150°C Lead Temperature (Soldering,IOsecs) +300°C OLE NOTE 'RXOUT, TXOUT may be shorted to AGND, DGND, VDD, Vcc> Vss provided that the power dissipation of the package is not exceeded. lOOOmW Oto+70°C *Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect device reliability. Only one absolute maximum rating may be applied at anyone time. CAUTION ESD (electrostatic discharge) sensitive device. The digital control inputs are diode protected; however, permanent damage may occur on unconnected devices subject to high energy electrostatic fields. Unused devices must be stored in conductive foam or shunts. The protective foam should be discharged to the destination socket before devices are removed. TE ORDERING GUIDE Model Function AD734lJN AD734lJP AD737lJN AD7371JP Transmit Filter Transmit Filter Receive Filter Receive Filter *N = Plastic DIP; P = Plastic I ; Temperature Range DoCto +700e ooe to + 70ce DoCto +70ce Doe to + 70oe i Package Option* N-24 P-28A N-24 P-28A Leaded Chip Carrier (PLCC). -4- REV. A ANALOG DEVICES fAX-ON-DEMAND HOTLINE - Page 3c AD7341/AD7371 PIN CONFIGURATIONS DIP PLCC 241TXlN TXOUT11 I . Z ~..>- .. 5 z ~ : >< I>'" :> '" " Z Q 0 " '" ~ i uz :> ".. Z .. :> '" 2> MEaUENCY.. I I j i I -.- 150 -700 3.3k Hz Figure 6. Passband Ripple in the AD7341/AD7371 ! -700 i I j i I I ",,"-..".. ! ! I >- -300 -600 - ;. ~ w '" ~ -400 0 "'" -SOD ; -500 80 ! ! ! i ..zoo - FREQUENCY , '" " i SOD ! j