PDF《Precision 5 Volt Reference》

LT1027

1 Precision

5 Volt Reference S FEATURE D U ESCRIPTIO s Very Low Drift C 2ppm/°C Max TC s Pin Compatible with LT1021-5, REF-02 s Output Sources 15mA, Sinks 10mA s Excellent Transient Response Suitable for A-to-D Reference Inputs s Noise Reduction Pin s Excellent Long-Term Stability s Less Than 1ppm p-p Noise (0.

1Hz to 10Hz) The LT1027 is a precision reference with extra-low drift, superior accuracy, excellent line and load regulation and low output impedance at high frequency. This device is intended for use in 12- to 16-bit A-to-D and D-to-A systems where demanding accuracy requirements must be met without the use of power-hungry heated-substrate references. The fast-settling output recovers quickly from loadtransientssuchasthosepresentedbyA-to-Dconverter reference inputs. The LT1027 brings together both outstanding accuracy and temperature coefficient specifications. The LT1027 reference is based on LTC'

s proprietary advanced sub-surface zener bipolar process which eliminates noise and stability problems associated with surface-breakdown devices. U S A O PPLICATI s A-to-D and D-to-A Converters s Digital Voltmeters s Reference Standard s Precision Current Source Supplying VREF and VCC to the LTC1290 12-bit ADC Output Voltage U A O PPLICATI TYPICAL TEMPERATURE (°C) C50 VOLTAGE 5.002 5.004 5.006

25 75 LT1027 G03 5.000 4.998 C25

0 50

100 125 4.996 4.994 + ANALOG INPUTS VIN VOUT VTRIM GND + 10k 22?F 2.2?F

8 C 40V LT1027 TO ?C CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 SCLK ACLK DOUT DIN CS VCC REF+ REFC COM AGND VC DGND LT1290 LT1027 TA01 LT1027

2 A U G W A W U W A R BSOLUTE XI TI S W U U PACKAGE/ORDER I FOR ATIO ORDER PART NUMBER * CONNECTED INTERNALLY. DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS. LT1027BCN8 LT1027CCN8 LT1027DCN8 LT1027ECN8 LT1027ECS8 Supply Voltage (VIN)40V Input-Output Voltage Differential 35V Output to Ground Voltage.7V VTRIM to Ground Voltage Positive 5V Negative 0.3V Output Short Circuit Duration VIN >

20V

10 sec VIN ≤ 20V Indefinite Operating Temperature Range LT1027M.55°C to 125°C LT1027C.0°C to 70°C Storage Temperature Range All Devices.65°C to 150°C Lead Temperature (Soldering,

10 sec)300°C TOP VIEW NC* NC* NC* VIN VOUT VTRIM NR GND

8 7

6 5

3 2

1 4 H PACKAGE 8-LEAD TO-5 METAL CAN

1 2

3 4

5 6

7 8 TOP VIEW NC* NC* NC* VIN VOUT VTRIM NR GND N8 PACKAGE 8-LEAD PLASTIC DIP LT1027ACH LT1027BCH LT1027CCH LT1027DCH LT1027ECH LT1027DMH LT1027EMH

1 2

3 4

5 6

7 8 TOP VIEW VIN GND NR NC* VOUT VTRIM S8 PACKAGE 8-LEAD PLASTIC SOIC NC* NC* LT1027

1191 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VOUT Output Voltage (Note 1) LT1027A 4.999 5.000 5.001 V LT1027B, C, D 4.9975 5.000 5.0025 LT1027E 4.995 5.000 5.005 TCVOUT Output Voltage Temperature Coefficient LT1027A, B q

1 2 ppm/°C (Note 2) LT1027C q

2 3 LT1027D q

2 5 LT1027E q

3 7.5 Line Regulation (Note 3) 8V ≤ VIN ≤ 10V

6 12 ppm/V q

25 10V ≤ VIN ≤ 40V

3 6 ppm/V q

8 ppm/mA Load Regulation (Note 3) Sourcing Current

3 6 ppm/V

0 ≤ IOUT ≤ 15mA q

8 Sinking Current

30 50 ppm/mA

0 ≥ IOUT ≥ C10mA q

100 ELECTRICAL C C HARA TERISTICS TA = 25°C, VIN = 10V, ILOAD = 0, unless otherwise specified. LT1027

3 Note 4: RMS noise is measured with an 8-pole bandpass filter with a center frequency of 30Hz and a Q of 1.5. The filter output is then rectified and integrated for a fixed time period, resulting in an average, as opposed to RMS voltage. A correction factor is used to convert average to RMS. This value is then used to obtain RMS noise voltage in the 10Hz to 1000Hz frequency band. This test also screens for low-frequency popcorn noise within the bandwidth of the filter. Consult factory for 100% 0.1Hz to 10Hz noise testing. TA = 25°C, VIN = 10V, ILOAD = 0, unless otherwise specified. ELECTRICAL C C HARA TERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Current 1.8 2.4 mA q 2.8 VTRIM Adjust Range q ±30 ±50 mV en Output Noise (Note 4) 0.1Hz ≤ f ≤ 10Hz