19-1319; Rev 2; 6/07
KIT
ATION
EVALU
BLE
AVAILA
2x4-Channel, Simultaneous-Sampling
14-Bit DAS
General Description
Features
o
Four Simultaneous-Sampling T/H Amplifiers with
Two Multiplexed Inputs (eight single-ended inputs
total)
o
3µs Conversion Time per Channel
o
Throughput: 250ksps (1 channel)
142ksps (2 channels)
100ksps (3 channels)
76ksps (4 channels)
o
Input Range: ±5V (MAX125)
±2.5V (MAX126)
o
Fault-Protected Input Multiplexer (±17V)
o
±5V Supplies
o
Internal +2.5V or External Reference Operation
o
Programmable On-Board Sequencer
o
High-Speed Parallel DSP Interface
MAX125/MAX126
The MAX125/MAX126 are high-speed, multichannel,
14-bit data-acquisition systems (DAS) with simultaneous
track/holds (T/Hs). These devices contain a 14-bit, 3µs,
successive-approximation analog-to-digital converter
(ADC), a +2.5V reference, a buffered reference input,
and a bank of four simultaneous-sampling T/H ampli-
fiers that preserve the relative phase information of the
sampled inputs. The MAX125/MAX126 have two multi-
plexed inputs for each T/H, allowing a total of eight
inputs. In addition, the converter is overvoltage tolerant
to ±17V; a fault condition on any channel will not harm
the IC. Available input ranges are ±5V (MAX125) and
±2.5V (MAX126).
An on-board sequencer converts one to four channels
per
CONVST
pulse. In the default mode, one T/H output
(CH1A) is converted. An interrupt signal (INT) is provided
after the last conversion is complete. Convert two,
three, or four channels by reprogramming the
MAX125/MAX126 through the bidirectional parallel
interface. Once programmed, the MAX125/MAX126
continue to convert the specified number of channels
per
CONVST
pulse until they are reprogrammed. The
channels are converted sequentially, beginning with
CH1. The
INT
signal always follows the end of the last
conversion in a conversion sequence. The ADC con-
verts each assigned channel in 3µs and stores the
result in an internal 14x4 RAM. Upon completion of the
conversions, data can be accessed by applying suc-
cessive pulses to the
RD
pin. Four successive reads
access four data words sequentially.
The parallel interface’s data-access and bus-release
timing specifications are compatible with most popular
digital signal processors and 16-bit/32-bit microproces-
sors, so the MAX125/MAX126 conversion results can
be accessed without resorting to wait states.
Ordering Information
PART
MAX125CCAX
MAX126CCAX
TEMP RANGE
0°C to +70°C
0°C to +70°C
PIN-
INL
PACKAGE (LSB)
36 SSOP
36 SSOP
36 SSOP
36 SSOP
±4
±4
±4
±4
PKG
CODE
A36-4
A36-4
A36-4
A36-4
MAX125CEAX -40°C to +85°C
MAX126CEAX -40°C to +85°C
Applications
Multiphase Motor Control
Power-Grid Synchronization
Power-Factor Monitoring
Digital Signal Processing
Vibration and Waveform Analysis
Typical Operating Circuit appears at end of data sheet.
Pin Configuration appears at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing delivery, and ordering information please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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