a Four-Channel, Simultaneous Sampling, Fast, 14-Bit …

1 REV. BInformation furnished by analog devices is believed to be accurate andreliable. However, no responsibility is assumed by analog devices for itsuse, nor for any infringements of patents or other rights of third partieswhich may result from its use. No license is granted by implication orotherwise under any patent or patent rights of analog Technology Way, Box 9106, Norwood, MA 02062-9106, : 781/329-4700 World Wide Web Site: : 781/326-8703 analog devices , Inc., 2000 Four-Channel, SimultaneousSampling, Fast, 14-Bit ADCFEATURESFast ( s) 14-Bit ADCFour Simultaneously Sampled InputsFour Track/Hold s Track/Hold Acquisition s Conversion Time per ChannelHW/SW Select of Channel Sequence for ConversionSingle Supply OperationSelection of Input Ranges: 10 V, 5 V and V,0 V to 5 V and 0 V to VHigh Speed Parallel Interface Which Also AllowsInterfacing to 3 V ProcessorsLow Power, 115 mW TypPower Saving Mode, 15 W TypOvervoltage Protection on analog InputsAPPLICATIONSAC Motor ControlUninterruptible Power SuppliesIndustrial Power Meters/MonitorsData Acquisition SystemsCommunicationsGENERAL DESCRIPTIONThe AD7865 is a fast, low power, four-channel simultaneoussampling 14-Bit A/D converter that operates from a single 5 Vsupply.

2 The part contains a s successive approximationADC, four track/hold amplifiers, V reference, on-chip clockoscillator, signal conditioning circuitry and a high speed parallelinterface. The input signals on four channels are sampled simul-taneously thus preserving the relative phase information of thesignals on the four analog inputs. The part accepts analog inputranges of 10 V, 5 V, V, 0 V to V and 0 V to 5 part allows any subset of the four channels to be convertedin order to maximize the throughput rate on the selected channels to be converted can be selected either via hard-ware (channel select input pins) or via software (programmingthe channel select register).A single conversion start signal (CONVST) simultaneously placesall the track/holds into hold and initiates conversion sequencefor the selected channels. The EOC signal indicates the end ofeach individual conversion in the selected conversion BUSY signal indicates the end of the conversion is read from the part via a 14-Bit parallel data bus using thestandard CS and RD signals.

3 Maximum throughput for a singlechannel is 350 kSPS. For all four channels the maximum through-put is 100 AD7865 is available in a small ( sq. inch area) HIGHLIGHTS1. The AD7865 features four Track/Hold amplifiers and a fast( s) ADC allowing Simultaneous sampling and then con-version of any subset of the four The AD7865 operates from a single 5 V supply and con-sumes only 115 mW typ, making it ideal for low power andportable The part offers a high speed parallel interface for easy con-nection to microprocessors, microcontrollers and digitalsignal The part is offered in three versions with different analoginput ranges. The AD7865-1 offers the standard industrialranges of 10 V and 5 V; the AD7865-2 offers a unipolarrange of 0 V to V or 0 V to 5 V and the AD7865-3 offersthe common signal processing input range of The part features very tight aperture delay matching betweenthe four input sample and hold BLOCK DIAGRAMSIGNALSCALINGSIGNALSCALINGSIGNALS CALINGSIGNALSCALINGFRSTDATAAGNDCHANNELSE LECTREGISTERMUXDB0 DB3+ 46k AD7865 EOCVDRIVERDCLK IN/SL1 INT/EXTCLK/SL2SL3 SL4H/SSELDGNDAVDDVREF AGNDCONVSTBUSYDB13 DVDDVIN4 AVIN3 BVIN3 AVIN2 BVIN1 BSTBYVREFAGND AGNDVIN1 AVIN2A14-BITADCCONVERSIONCONTROL LOGICINTCLOCKINT/EXTCLOCKSELECTOUTPUTLAT CHWRCSDB0 VIN4 BREV.

4 B 2 AD7865 SPECIFICATIONS(VDD = 5 V 5%, AGND = DGND = 0 V, VREF = Internal. Clock = Internal; all specifi-cations TMIN to TMAX unless otherwise noted.)ParameterA, Y Versions1B VersionUnitTest Conditions/CommentsSAMPLE AND HOLD 3 dB Full Power Bandwidth33 MHz typAperture Delay2020ns maxAperture Jitter5050ps typAperture Delay Matching44ns maxDYNAMIC PERFORMANCE2fIN = 100 kHz, fS = 350 kSPSS ignal to (Noise + Distortion) Ratio3@ 25 CAD7865-1, AD7865-37878dB minTypically 80 dBAD7865-27777dB minTypically 78 dBTMIN to TMAXAD7865-1, AD7865-37777dB minAD7865-27676dB minTotal Harmonic Distortion3, 4 86 86dB maxPeak Harmonic or Spurious Noise3, 4 86 86dB maxIntermodulation Distortion3fa = 49 kHz, fb = 50 kHz2nd Order Terms 95 95dB typ3rd Order Terms 95 95dB typChannel-to-Channel Isolation3, 5 88 88dB maxfIN = 50 kHz Sine WaveDC ACCURACYAny ChannelResolution1414 BitsRelative Accuracy (INL)3 2 maxTypically LSBsDifferential Nonlinearity (DNL)3 1 1 LSB maxNo Missing Codes GuaranteedAD7865-1 Positive Gain Error3 10 8 LSB maxTypically 2 LSBsPositive Gain Error Match388 LSB maxTypically 2 LSBsNegative Gain Error3 10 8 LSB maxTypically 2 LSBsNegative Gain Error Match388 LSB maxTypically 2 LSBsBipolar Zero Error 12 10 LSB maxTypically 2 LSBsBipolar Zero Error Match66 LSB maxTypically LSBsAD7865-2 Positive Gain Error3 16 16 LSB maxTypically 2 LSBsPositive Gain Error Match388 LSB maxTypically 2 LSBsUnipolar Offset Error3 10 10 LSB maxTypically 2 LSBsUnipolar Offset Error Match31010 LSB maxTypically 2 LSBsAD7865-3 Positive Gain Error3 16 14 LSB maxTypically 6 LSBsPositive Gain Error Match388 LSB maxTypically 2 LSBsNegative Gain Error3 16 14 LSB maxTypically 6 LSBsNegative Gain Error Match388 LSB maxTypically 2 LSBsBipolar Zero Error 14 12 LSB maxTypically 5 LSBsBipolar Zero Error Match86 LSB maxTypically 2 LSBsANALOG INPUTSAD7865-1 Input Voltage Range 5, 10 5.

5 10 VoltsInput Current1, 11, 1mA maxVIN = 5 V and 10 V Respectively,Typically mAAD7865-2 Input Voltage Range0 V to V,0 V to V,0 V to 5 V0 V to 5 VVoltsInput Current1010 A maxVIN = V, 0 V to V Range, Typ 1 A11mA maxVIN = 5 V, 0 V to 5 V Range, Typ mAAD7865-3 Input Voltage Range Current11mA maxVIN = V, Typically mAREV. B 3 AD7865 ParameterA, Y Versions1B VersionUnitTest Conditions/CommentsREFERENCE INPUT/OUTPUTVREF IN Input Voltage V 5%VREF IN Input Capacitance61010pF maxVREF OUT Output nomVREF OUT Error @ 25 C 10 10mV maxVREF OUT Error TMIN to TMAX 20 20mV maxVREF OUT Temperature Coefficient2525ppm/ C typVREF OUT Output Impedance66k typSee Reference SectionLOGIC INPUTSI nput High Voltage, minVDD = 5 V 5%Input Low Voltage, maxVDD = 5 V 5%Input Current, IIN 10 10 A maxInput Capacitance, CIN61010pF maxLOGIC OUTPUTSO utput High Voltage, minISOURCE = 400 AOutput Low Voltage, maxISINK = mADB13 DB0 High ImpedanceLeakage Current 10 10 A maxCapacitance61010pF maxOutput CodingAD7865-1, AD7865-3 Two s ComplementAD7865-2 Straight (Natural)

6 BinaryCONVERSION RATEC onversion s maxFor Single ChannelTrack/Hold Acquisition Time2, s maxThroughput Time350350kSPS maxFor Single Channel100100kSPS maxFor All Four ChannelsPOWER REQUIREMENTSVDD55V nom 5% for Specified PerformanceIDDAD7865-1 Typically 23 mA, Logic Inputs = 0 V or VDDN ormal Mode3232mA maxStandby Mode2020 A maxAD7865-2 Typically 20 mA, Logic Inputs = 0 V or VDDN ormal Mode3030mA maxStandby Mode2020 A maxAD7865-3 Typically 23 mA, Logic Inputs = 0 V or VDDN ormal Mode3232mA maxStandby Mode2020 A maxPower DissipationAD7865-1 Normal Mode160160mW maxTypically 115 mW. VDD = 5 VStandby Mode100100 W maxTypically 15 WAD7865-2 Normal Mode150150mW maxTypically 100 mW. VDD = 5 VStandby Mode100100 W maxTypically 15 WAD7865-3 Normal Mode160160mW maxTypically 115 mW. VDD = 5 VStandby Mode100100 W maxTypically 15 WNOTES1 Temperature ranges are as follows : A, B Versions: 40 C to +85 C, Y Version: 40 C to +105 measured through full channel (SHA and ADC).

7 3 See Harmonic Distortion and Peak Harmonic or Spurious Noise are specified at 83 dBs for the between any two channels with the other two channels tested @ 25 C to ensure subject to change without BAD7865 4 TIMING CHARACTERISTICS1, 2 ParameterA, B, Y VersionsUnitTest s maxConversion Time, Internal s maxConversion Time, External Clock (5 MHz) s maxAcquisition TimetBUSYNo. of ChannelsSelected Number of Channels Multiplied by tCONV (tCONV) s maxtWAKE-UP External VREF31 s maxSTBY Rising Edge to CONVST Rising Edget135ns minCONVST Pulsewidtht270ns minCONVST Rising Edge to BUSY Rising EdgeRead Operationt30ns minCS to RD Setup Timet40ns minCS to RD Hold Timet535ns minRead Pulsewidtht6435ns maxData Access Time after Falling Edge of RD, VDRIVE = 5 V40ns maxData Access Time after Falling Edge of RD, VDRIVE = 3 Vt755ns minBus Relinquish Time after Rising Edge of RD30ns maxt815ns minTime Between Consecutive Readst9120ns minEOC Pulsewidth180ns maxt1070ns maxRD Rising Edge to FRSTDATA Edge (Rising or Falling)

8 T1115ns maxEOC Falling Edge to FRSTDATA Falling Delayt120ns minEOC to RD DelayWrite Operationt1320ns minWR Pulsewidtht140ns minCS to WR Setup Timet150ns minWR to CS Hold Timet165ns minInput Data Setup Time of Rising Edge of WRt175ns minInput Data Hold TimeExternal Clockt18200ns minCONVST Falling Edge to CLK Rising EdgeNOTES1 Sample tested at 25 C to ensure compliance. All input signals are measured with tr = tf = 1 ns (10% to 90% of 5 V) and timed from a voltage level of Figures 6, 7 and to the Standby Mode Operation section. The MAX specification of 1 s is valid when using a F decoupling capacitor on the VREF with the load circuit of Figure 1 and defined as the time required for an output to cross V or times are derived from the measured time taken by the data outputs to change V when loaded with the circuit of Figure 1. The measured number is thenextrapolated back to remove the effects of charging or discharging the 50 pF capacitor.

9 This means that the times quoted in the timing characteristics are the true busrelinquish times of the part and as such are independent of external bus loading subject to change without AFigure 1. Load Circuit for Access Time and Bus Relinquish Time(VDD = 5 V 5%, AGND = DGND = 0 V, VREF = Internal, Clock = Internal; all specificationsTMIN to TMAX unless otherwise noted.)REV. BAD7865 5 CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readilyaccumulate on the human body and test equipment and can discharge without the AD7865 features proprietary ESD protection circuitry, permanent damage mayoccur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESDprecautions are recommended to avoid performance degradation or loss of !ESD SENSITIVE DEVICEABSOLUTE MAXIMUM RATINGS*(TA = 25 C unless otherwise noted)VDD to AGND .. V to +7 VVDD to DGND.

10 V to +7 VVDRIVE to DGND .. VDD + VAnalog Input Voltage to AGNDAD7865-1 ( 10 V Input Range) .. 18 VAD7865-1 ( 5 V Input Range) .. 9 VAD7865-2 .. 1 V to +18 VAD7865-3 .. 4 V to +18 VReference Input Voltage to AGND .. V to VDD + VDigital Input Voltage to DGND .. V to VDD + VDigital Output Voltage to DGND .. V to VDD + VOperating Temperature RangeCommercial (A, B Versions) .. 40 C to +85 CAutomotive (Y Version) .. 40 C to +105 CStorage Temperature Range .. 65 C to +150 CJunction Temperature .. 150 CPQFP Package, Power Dissipation .. 450 mW JA Thermal Impedance .. 95 C/WLead Temperature, SolderingVapor Phase (60 sec) .. 215 CInfrared (15 sec) .. 220 C*Stresses above those listed under Absolute Maximum Ratings may cause perma-nent damage to the device. This is a stress rating only; functional operation of thedevice at these or any other conditions above those listed in the operationalsections of this specification is not implied.