SP8538
SIGNAL PROCESSING EXCELLENCE
Micropower Sampling 12-Bit A/D Converter
s
s
s
s
s
s
s
s
s
s
s
Low Cost
12-Bit Serial Sampling ADC
Guaranteed +1.0 LSB Max INL
Guaranteed No Missing Codes
8-Pin NSOIC Plastic Package
Low Power @ 250碌A(chǔ) including
Automatic Shutdown: 1nA(typ)
Programmable Input Configuration:
Full differential or 2 channel
single-ended
Single Supply 3.0V to 5.5V operation
Half Duplex Digital Serial Interface
Sample Rate: 40碌S
Pin Compatible Upgrade to LTC 1298
DESCRIPTION
The
SP8538
is a very low power 12-Bit data acquisition chip. The
SP8538
typically draws 250碌A(chǔ)
of supply current when sampling at 25 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
SP8538
is available in 8-Pin NSOIC packages, specified over Commercial
and Industrial temperature ranges. The
SP8538
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 or 4 wires.
GND
VCC
REFL
REFH
Internal
VCC
12
REFL
DAC
REFH
Csample P
CH0
PARALLEL TO
SERIAL SHIFT
REGISTER
MUX
CH1
COMPARATOR
SAR
Dout
Csample N
DIN
INPUT
DATA
REG
CS
CLK
TIMING &
CONTROL LOGIC
SP8538 Block Diagram
SP8538DS/01
SP8538 Micropower Sampling 12-Bit A/D Converter
漏 Copyright 1999 Sipex Corporation
1