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    产品型号ZN429E8的Datasheet PDF文件预览

    THIS DOCUMENT IS FOR MAINTENANCE  
    PURPOSES ONLY AND IS NOT  
    RECOMMENDED FOR NEW DESIGNS  
    MAY 1994  
    DS3008-2.0  
    ZN429E8/ZN429D  
    LOW COST 8-BIT D-A CONVERTER  
    +VCC (+5V)  
    BIT 4  
    BIT 5  
    1
    14  
    13  
    12  
    11  
    10  
    9
    BIT 3  
    BIT 2  
    (MSB) BIT 1  
    The ZN429 is  
    containing an R-2R ladder network of diffused resistors with  
    precision bipolar switches.  
    a
    monolithic 8-bit D-A converter  
    2
    3
    4
    5
    6
    7
    ANALOG OUTPUT  
    BIT 6  
    BIT 7  
    BIT 8 (LSB)  
    NC  
    ZN429E8  
    VREF IN  
    NC  
    FEATURES  
    1
    ■ Linearity Error ± / LSB  
    ■ Single +5V Supply  
    2
    0V  
    8
    ■ Low Power Consumption 25mW Typical  
    ■ Settling Time 1 Microsecond Typical  
    ■ TTL and 5V CMOS Compatible  
    ■ Designed for Low Cost Applications  
    DP14  
    1
    BIT 1  
    BIT 2  
    BIT 3  
    +VCC  
    14  
    13  
    12  
    11  
    10  
    9
    NC  
    2
    3
    4
    5
    6
    7
    ANALOG OUTPUT  
    VREF IN  
    ABSOLUTE MAXIMUM RATINGS  
    GROUND  
    BIT 8  
    Supply voltage, V  
    +7.0V  
    +5.5V  
    ZN429D  
    CC  
    BIT 4  
    BIT 5  
    BIT 6  
    Max. voltage, logic and V  
    inputs  
    REF  
    BIT 7  
    Storage temperature range  
    -55°C to +125°C  
    GROUND  
    8
    ORDERING INFORMATION  
    Ambient operating temperature  
    Package, ZN429D  
    MP14  
    -40°C to +85°C  
    MP14  
    Package, ZN429E8  
    DP14  
    Fig.1 Pin connections (not to scale) - top view  
    ZN429  
    ELECTRICAL CHARACTERISTICS  
    (at T  
    = 25°C and V = +5V unless otherwise specified)  
    amb  
    CC  
    Parameter  
    Symbol  
    Units  
    Conditions  
    Min.  
    Typ.  
    Max.  
    Converter  
    Resolution  
    8
    8
    -
    -
    -
    -
    bits  
    bits  
    LSB  
    LSB  
    µs  
    Accuracy  
    -
    Non-linearity  
    -
    ±0.5  
    Differential non-linearity  
    Settling time to 0.5LSB  
    Settling time to 0.5LSB  
    -
    ±0.5  
    1.0  
    2.0  
    -
    -
    -
    Note 1  
    -
    1 LSB step  
    -
    µs  
    All bits ON to OFF  
    or OFF to ON  
    Offset voltage ZN429E8, ZN429D  
    V
    -
    -
    3.0  
    5
    5.0  
    -
    mV  
    µV/°C  
    V
    All bits OFF  
    OS  
    V
    temperature coefficient  
    OS  
    Full-scale output  
    2.545  
    2.550  
    2.555  
    All bits ON  
    Ext. V  
    Ext. V  
    = 2.56V  
    REF  
    Full-scale temp. coefficient  
    Non-linearity temp. coefficient  
    Analog output resistance  
    External reference voltage  
    Supply voltage  
    -
    3
    7.5  
    10  
    -
    -
    -
    ppm/°C  
    = 2.560V  
    REF  
    -
    -
    ppm/°C  
    Relative to F.S.R.  
    R
    -
    kΩ  
    V
    O
    0
    3.0  
    5.5  
    9
    V
    4.5  
    -
    -
    V
    CC  
    Supply current  
    I
    5
    mA  
    V
    S
    High level input voltage  
    Low level input voltage  
    High level input current  
    V
    2.0  
    -
    -
    -
    IH  
    V
    -
    0.7  
    10  
    V
    IL  
    I
    -
    -
    µA  
    V
    = max.  
    IH  
    CC  
    V = 2.4V  
    I
    -
    -
    -
    -
    100  
    µA  
    V
    = max.  
    CC  
    V = 5.5V  
    I
    Low level input current  
    I
    -0.18  
    mA  
    V
    = max.  
    IL  
    CC  
    V = 0.3V  
    I
    NOTE 1: Monotonic over full temperature range.  
    INTRODUCTION  
    The ZN429 is an 8-bit D-A converter. It contains an  
    advanced design of R-2R ladder network and an array of  
    precision bipolar switches on a single monolithic chip.  
    The special design of the ladder network results in full  
    8-bit accuracy using normal diffused resistors.  
    Binary weighted voltages are produced at the output of  
    the R-2R ladder, the value depending on the digital number  
    applied to the bit inputs.  
    An external fixed or varying reference is required which  
    should have a slope resistance less than 2Ω.  
    Suggested external reference sources are the ZN404 or  
    one of the ZN458 range. Each ZN404 is capable of supplying  
    up to five ZN429 circuits and this is increased to ten for the  
    ZN458 range.  
    The converter is of the voltage switching type and uses  
    an R-2R resistor ladder network as shown in Fig.3.  
    Each 2R element is connected either to 0V or V  
    by  
    REF  
    transistor switches specially designed for low offset voltage  
    (typically 1mV).  
    ZN429  
    Fig.3 The R-2R ladder network  
    APPLICATIONS  
    Using these relationships a table of nominal resistance  
    (1) Unipolar D-A Converter  
    values for R and R can be constructed for V  
    = 2.5V.  
    1
    2
    REF IN  
    The nominal output range of the ZN429 is 0 to V  
    REF IN  
    through a 10Ω resistance. Other output ranges can readily  
    be obtained by using an external amplifier.  
    Output Range  
    +5V  
    G
    2
    R
    R
    2
    1
    The resulting full-scale range is given by  
    20kΩ  
    40kΩ  
    20kΩ  
    V
    =( 1 + R1 ) V  
    = G.V  
    REF IN REF IN  
    OUT FS  
    R2  
    +10V  
    4
    13.33kΩ  
    The impedance at the inverting input is R1//R2 and for  
    low drift with temperature this parallel combination should be  
    equal to the ladder resistance (10kΩ). The required nominal  
    values of R1 and R2 are given by  
    For gain setting R is adjusted about its nominal value.  
    1
    Practical circuit realisations (including amplifier stabilising  
    components) for +5 and +10V output ranges are given in  
    Fig.5. Settling time for a major transition is 2.5µs typical.  
    R1 = 10GkΩ and R = 10G/(G-1)kΩ.  
    2
    Fig.4 Unipolar operation - basic circuit  
    ZN429  
    Fig.5 Unipolar operation - component values  
    UNIPOLAR ADJUSTMENT PROCEDURE  
    (i) Set all bits to OFF (LOW) and adjust zero until V  
    0.0000V.  
    =
    =
    (2) Bipolar D-A Converter  
    OUT  
    For bipolar operation the output from the ZN429 is offset  
    by half full-scale by connecting a resistor R3 between V  
    (ii) Set all bits ON (HIGH) and adjust gain until V  
    OUT  
    REF  
    FS - 1LSB.  
    and the inverting input of the buffer amplifier (Fig.6).  
    IN  
    UNIPOLAR SETTING UP POINTS  
    When the digital input of the ZN429 is zero the analog  
    output is zero and the amplifier output should be -full-scale.  
    An input of all ones to the D-A will give a ZN429 output of d  
    Output Range, +FS  
    LSB  
    FS - 1LSB  
    V
    and the amplifier output required is +full-scale. Also,  
    REF IN  
    +5V  
    19.5 mV  
    39.1mV  
    4.9805V  
    9.9609V  
    to match the ladder resistance the parallel combination of  
    R , R and R should be 10kΩ.  
    1
    2
    3
    +10V  
    The nominal values of R , R and R which meet these  
    1
    2
    3
    conditions are given by  
    1LSB = FS  
    256  
    R1 = 20GkΩ, R2 = 20G/(G-1)kΩ and R3 = 20kΩ.  
    where the resultant output range is ±G.V  
    .
    REF IN  
    UNIPOLAR LOGIC CODING  
    Assuming that V  
    = 2.5V the nominal values of  
    REF IN  
    resistors for ±5 and ±10V output ranges are given in the  
    following table:  
    Input Code  
    (Binary)  
    Analog Output  
    (Nominal Value)  
    11111111  
    11111110  
    11000000  
    10000001  
    10000000  
    01111111  
    01000000  
    00000001  
    00000000  
    FS - 1LSB  
    FS - 2 LSB  
    Output Range  
    ±5V  
    G
    2
    R
    R
    R
    3
    1
    2
    3
    / FS  
    40kΩ  
    80kΩ  
    40kΩ  
    20kΩ  
    20kΩ  
    4
    1
    / FS + 1LSB  
    2
    1
    1
    1
    ±10V  
    4
    26.67kΩ  
    / FS  
    2
    / FS - 1LSB  
    2
    / FS  
    4
    Minus full scale (0FFSET) is set by adjusting R1 about  
    its nominal value relative to R3. Plus full-scale (GAIN) is set  
    by adjusting R2 relative to R1.  
    1LSB  
    0
    Settling time for a major transistion is 2.5µs typical.  
    ZN429  
    Fig.6 Bipolar operation - basic circuit  
    BIPOLAR ADJUSTMENT PROCEDURE  
    BIPOLAR LOGIC CODING  
    (i) Set all bits to OFF (LOW) and adjust OFFSETuntil the  
    amplifier output reads -FULL-SCALE.  
    (ii) Set all bits ON (HIGH) and adjust gain until the  
    amplifier reads +(FULL-SCALE - 1LSB).  
    Input Code  
    Analog Output  
    (Nominal Value)  
    (Offset Binary)  
    11111111  
    11111110  
    11000000  
    10000001  
    10000000  
    01111111  
    01000000  
    00000001  
    00000000  
    +(FS - 1LSB)  
    BIPOLAR SETTING UP POINTS  
    +(FS - 2 LSB)  
    1
    + / FS  
    Input Range,  
    LSB  
    -FS  
    +(FS -  
    1LSB)  
    2
    + 1LSB  
    0
    ± FS  
    -1 LSB  
    ±5V  
    39.1 mV  
    78.1mV  
    -5.0000V  
    +4.9609V  
    9.9219V  
    1
    - / FS  
    2
    ±10V  
    -10.0000V  
    -(FS - 1LSB)  
    -FS  
    1LSB = 2FS  
    256  
    Fig.7 Bipolar operation - component values  
    ZN429  
    HEADQUARTERS OPERATIONS  
    GEC PLESSEY SEMICONDUCTORS  
    Cheney Manor, Swindon,  
    CUSTOMER SERVICE CENTRES  
    • FRANCE & BENELUX Les Ulis Cedex Tel: (1) 64 46 23 45 Fax: (1) 64 46 06 07  
    • GERMANY Munich Tel: (089) 3609 06-0 Fax: (089) 3609 06-55  
    • ITALY Milan Tel: (02) 66040867 Fax: (02)66040993  
    Wiltshire, United Kingdom. SN2 2QW  
    Tel: (01793) 518000  
    • JAPAN Tokyo Tel: (03) 5276-5501 Fax: (03) 5276-5510  
    Fax: (01793) 518411  
    • NORTH AMERICA Scotts Valley, USA Tel: (408) 438 2900 Fax: (408) 438 7023  
    • SOUTH EAST ASIA Singapore Tel: (65) 3827708 Fax: (65) 3828872  
    • SWEDEN Stockholm Tel: 46 8 702 97 70 Fax: 46 8 640 47 36  
    • TAIWAN, ROC Taipei Tel: 886 2 5461260 Fax: 886 2 7190260  
    • UK, EIRE, DENMARK, FINLAND & NORWAY  
    GEC PLESSEY SEMICONDUCTORS  
    P.O. Box 660017,  
    1500 Green Hills Road,  
    Scotts Valley, California 95067-0017,  
    United States of America.  
    Tel (408) 438 2900  
    Swindon Tel: (01793) 518510 Fax: (01793) 518582  
    These are supported by Agents and Distributors in major countries world-wide.  
    © GEC Plessey Semiconductors 1994 Publication No. DS3008 Issue No. 2.0 May 1994  
    TECHNICAL DOCUMENTATION - NOT FOR RESALE. PRINTED IN UNITED KINGDOM  
    Fax: (408) 438 5576  
    This publication is issued to provide information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be  
    regarded as a representation relating to the products or services concerned. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. The  
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