SP8528 Sipex, SP8528 Datasheet

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SP8528

Manufacturer Part Number
SP8528
Description
Micropower Sampling 12-Bit A/D Converter
Manufacturer
Sipex
Datasheet
SP8528 Block Diagram
SP8528DS/01
DESCRIPTION
The SP8528 is a very low power 12-Bit A/D converter. The SP8528 typically draws 230 A of
supply current when sampling at 33.2 kHz. Supply current drops linearly as the sample rate is
reduced. The ADC automatically powers down when not performing conversions, drawing only
leakage current. The SP8528 is available in 8-Pin NSOIC packages, specified over Commercial
and Industrial temperature ranges. The SP8528 is best suited for Battery-Operated Systems,
Portable Data Acquisition Instrumentation, Battery Monitoring, and Remote Sensing
applications. The serial port allows efficient data transfer to a wide range of microprocessors and
microcontrollers over 3 wires.
Low Cost
12-Bit Serial Sampling ADC
Guaranteed +1.0 LSB Max INL
Guaranteed No Missing Codes
8-Pin NSOIC Plastic Package
Low Power @ 230 A including
Automatic Shutdown: 1nA (typ)
Full differential input stage
Single Supply 3.0V to 5.5V operation
Half Duplex Digital Serial Interface
Sample Rate: 30.12 S
Pin Compatible Upgrade to LTC 1286
Micropower Sampling 12-Bit A/D Converter
CS/SHDN
+IN
SCLK
-IN
®
REFL
SWITCHES
GND
INPUT
Csample N
SP8528 Micropower Sampling 12-Bit A/D Converter
Csample P
REFL
Internal
V CC
V CC
DAC
COMPARATOR
CONTROL LOGIC
1
TIMING &
VREF
12
SAR
PARALLEL TO
SERIAL SHIFT
REGISTER
© Copyright 2000 Sipex Corporation
SP8528
Dout

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SP8528 Summary of contents

Page 1

... Pin Compatible Upgrade to LTC 1286 DESCRIPTION The SP8528 is a very low power 12-Bit A/D converter. The SP8528 typically draws 230 A of supply current when sampling at 33.2 kHz. Supply current drops linearly as the sample rate is reduced. The ADC automatically powers down when not performing conversions, drawing only leakage current ...

Page 2

... V +.05 -.05 V +.05 Volts CC CC 1.5 1 33.2 22.2 3.0 .9 1.4 .9 1.4 SP8528 Micropower Sampling 12-Bit A/D Converter 2 UNITS CONDITIONS Bits LSB LSB LSB LSB No Missing Codes LSB LSB LSB LSB pF In Parallel with 100M Parallel with 100M M A clock See Timing Diagrams ...

Page 3

... SP8528 Micropower Sampling 12-Bit A/D Converter 3 V =5V + =5V + See Timing Diagram V =5V 5%, IOH=-0.4mA DD V =5V 5%, IOL=+1.6mA DD For all FFT’ ...

Page 4

... Pin 2- +IN - Positive Input SCLK Pin 3- -IN - Negative Input Pin 4- GND - Ground D OUT Pin 5- CS/SHDN - Chip Select Bar/Shutdown CS/SHDN Pin OUT Pin 7- SCLK - Serial Clock Pin Supply CC SP8528 Micropower Sampling 12-Bit A/D Converter 4 MAX. UNITS +5.5 Volts 333 kHz Reference Voltage - Data Out © ...

Page 5

... DESCRIPTION The SP8528 bit full differential sampling ADC with a serial data interface. The ADC samples and converts 12 bits of data in 30.1 S with a 5V supply voltage applied. The SP8528 will also operate at a 3.3V supply at 45.15 S throughput. The device automatically shuts down to a +0.5 A (MAX) level as soon as the chip is deselected (CS=1) ...

Page 6

... Single Ended or Full Differential Operation The SP8528 has a balanced full differential front end. The SP8528 can be used in this manner can be used in single-ended circuits as well. For single-ended systems, simply tie the -IN to the Reference Low of the input signal, which is ...

Page 7

... DOWN PU Twhcs HI Tcyc POWER DOWN Twhclk Twlclk Ten Thdo Tf 10% - 90% SP8528 Micropower Sampling 12-Bit A/D Converter 7 PU Twhcs D11 HI D10 Tdis Tclk Tr © Copyright 2000 Sipex Corporation ...

Page 8

... INLE -1 +1 DNLE -1 4095 0 100 10.0E+0 100.0E+0 1.0E+3 4095 SP8528 Micropower Sampling 12-Bit A/D Converter 8 Vcc = 5V 100 1000 10000 100000 conversion time ( s) Vcc = 3.3V Vref = 3.3V 4095 Input CMRR Vcc = 5V 10.0E+3 100.0E+3 1.0E+6 common mode frequency(Hz) © Copyright 2000 Sipex Corporation ...

Page 9

... Total Harmonic Distortion -50 -60 -70 -80 -90 100000 1000 SP8528 Micropower Sampling 12-Bit A/D Converter 9 Gain vs. Temperature 100 125 temperature (C) FFT 20 dB/div frequency 15.6kHz SNR = 73.01 dB THD = -79.54 dB SINAD = 72.14 dB SFDR = 84.66 dB Vinamp = -0.47 dB SINAD 10000 ...

Page 10

... SP8528 Micropower Sampling 12-Bit A/D Converter 10 C Ø 0.300 BSC A (7.620 BSC) 20–PIN 22–PIN 0.115/0.195 0.115/0.195 (2 ...

Page 11

... SP8528 Micropower Sampling 12-Bit A/D Converter 11 Ø L 16–PIN 0.053/0.069 (1.346/1.748) 0.004/0.010 (0.102/0.249) 0.013/0.020 (0.330/0.508) ...

Page 12

... SP8528KS .......................................................... 1.0 ..................................... –0˚C to +70˚C .......................................... 8-pin, 0.15" Plastic SOIC SP8528AN .......................................................... 2.0 .................................... –40˚C to +85˚C .............................................. 8-pin, 0.3" Plastic DIP SP8528JN ........................................................... 2.0 ..................................... –0˚C to +70˚C ............................................... 8-pin, 0.3" Plastic DIP SP8528AS .......................................................... 2.0 .................................... –40˚C to +85˚C ......................................... 8-pin, 0.15" Plastic SOIC SP8528JS ........................................................... 2.0 ..................................... –0˚C to +70˚C .......................................... 8-pin, 0.15" Plastic SOIC Please consult the factory for pricing and availability on a Tape-On-Reel option ...

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