MAX125EVB16 Maxim Integrated Products, MAX125EVB16 Datasheet

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MAX125EVB16

Manufacturer Part Number
MAX125EVB16
Description
EVAL KIT FOR MAX125
Manufacturer
Maxim Integrated Products
Datasheets

Specifications of MAX125EVB16

Number Of Adc's
4
Number Of Bits
14
Sampling Rate (per Second)
250k
Data Interface
Parallel
Inputs Per Adc
2 Single
Input Range
±5 V
Power (typ) @ Conditions
165mW @ 250kSPS
Voltage Supply Source
Analog and Digital, Dual ±
Operating Temperature
0°C ~ 70°C
Utilized Ic / Part
MAX125
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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.
19-1319; Rev 3; 7/08
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.
Multiphase Motor Control
Power-Grid Synchronization
Power-Factor Monitoring
Digital Signal Processing
Vibration and Waveform Analysis
________________________________________________________________ Maxim Integrated Products
General Description
2x4-Channel, Simultaneous-Sampling
Applications
♦ Four Simultaneous-Sampling T/H Amplifiers with
♦ 3µs Conversion Time per Channel
♦ Throughput: 250ksps (1 channel)
♦ Input Range: ±5V (MAX125)
♦ Fault-Protected Input Multiplexer (±17V)
♦ ±5V Supplies
♦ Internal +2.5V or External Reference Operation
♦ Programmable On-Board Sequencer
♦ High-Speed Parallel DSP Interface
Typical Operating Circuit appears at end of data sheet.
Pin Configuration appears at end of data sheet.
MAX125CCAX
MAX126CCAX
MAX125CEAX
MAX126CEAX
Two Multiplexed Inputs (eight single-ended inputs
total)
PART
142ksps (2 channels)
100ksps (3 channels)
76ksps (4 channels)
±2.5V (MAX126)
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
Ordering Information
14-Bit DAS
PIN-PACKAGE
36 SSOP
36 SSOP
36 SSOP
36 SSOP
Features
(LSB)
INL
±4
±4
±4
±4
1

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MAX125EVB16 Summary of contents

Page 1

... Power-Grid Synchronization Power-Factor Monitoring Digital Signal Processing Vibration and Waveform Analysis ________________________________________________________________ Maxim Integrated Products 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. ♦ Four Simultaneous-Sampling T/H Amplifiers with Two Multiplexed Inputs (eight single-ended inputs total) ♦ ...

Page 2

Simultaneous-Sampling 14-Bit DAS ABSOLUTE MAXIMUM RATINGS AV to AGND ...........................................................-0. AGND ............................................................0. DGND ...........................................................-0. AGND to DGND .......................................................-0.3V to 0.3V CH_ _ to AGND....................................................................±17V REFIN, REFOUT ...

Page 3

Simultaneous-Sampling ELECTRICAL CHARACTERISTICS (continued) (AV = +5V ±5 -5V ±5 AGND, 0.1µF capacitor from REFIN to AGND, f noted.) PARAMETER SYMBOL ANALOG INPUT Input Voltage Range V Input Current Input Capacitance C TRACK/HOLD Acquisition ...

Page 4

Simultaneous-Sampling 14-Bit DAS ELECTRICAL CHARACTERISTICS (continued) (AV = +5V ±5 -5V ±5 AGND, 0.1µF capacitor from REFIN to AGND, f noted.) PARAMETER SYMBOL DIGITAL OUTPUTS (D0–D13, INT) (Note 1) Output High Voltage V OH ...

Page 5

Simultaneous-Sampling TIMING CHARACTERISTICS (Figure 4) (AV = +5V -5V +5V, AGND = DGND = 0V PARAMETER SYMBOL t CONVST Pulse Width Setup Time CWS ...

Page 6

Simultaneous-Sampling 14-Bit DAS ______________________________________________________________Pin Description PIN NAME 1, 2 CH2B, CH2A Channel 2 Multiplexed Inputs, single-ended 3, 4 CH1B, CH1A Channel 1 Multiplexed Inputs, single-ended 5 AV +5V ±5% Analog Supply Voltage DD 6 REFIN External Reference Input/Internal Reference ...

Page 7

Simultaneous-Sampling CH1A A MUX T/H B CH1B CH2A A T/H MUX B CH2B CH3A A T/H MUX B CH3B CH4A A MUX T/H B CH4B AV DD AGND AV SS MAX125 MAX126 Figure 2. Functional Diagram _______________________________________________________________________________________ BANDGAP REFERENCE ...

Page 8

Simultaneous-Sampling 14-Bit DAS CH_A 5k S1A S1B 5k CH_B S3B MAX125 MAX126 Figure 3. Equivalent Input Circuit signal, and the programmed mode. The T/H amplifiers hold the input voltages at the CONVST rising ...

Page 9

Simultaneous-Sampling t CW CONVST INT t CWH t t CSD CWS DATA DATA Figure 4. Timing Diagram (LSB Figure 5. Programming a Four-Channel ...

Page 10

Simultaneous-Sampling 14-Bit DAS Table 1. Modes of Operation ...

Page 11

Simultaneous-Sampling REFOUT 7 TO DAC REFIN 6 MAX125 MAX126 10k 2.5V Figure 7. External Reference 1ppm/°C (max) temperature drift. Connect an external reference at REFIN as shown in Figure 7. The minimum impedance is 7kΩ ...

Page 12

Simultaneous-Sampling 14-Bit DAS 1/2 HC74 PRE CLR V CC INT EXTERNAL CLOCK V CC Figure 9. Output Demultiplexer Circuit The circuit of Figure 10 shows a typical vector motor- control application using ...

Page 13

Simultaneous-Sampling EXTERNAL SETPOINTS CONTROLLER 14 DSP C Figure 10. Vector Motor Control brought to the MAX125/MAX126 at CH4B. The addi- tional channels can be used to evaluate slower analog inputs, such as the main DC bus voltage (CH2B), tem- ...

Page 14

Simultaneous-Sampling 14-Bit DAS __________________Pin Configuration TOP VIEW CH2B 1 CH2A 2 CH1B 3 CH1A MAX125 REFIN 6 MAX126 REFOUT 7 AGND 8 D13 (MSB D12 D11 11 D10 ...

Page 15

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2008 Maxim Integrated Products ...

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