ADC488/16A & ADC488/8SA
IEEE 488 A/D Converter with Digital I/OFeatures• Provides 16‑bit A/D conversion at up
to 100,000 samples/s• Offers 16 single‑ended or 8 differen‑tial analog inputs, expandable using
master/slave configuration• Provides ±1, ±2, ±5, and ±10 VFS­programmable input ranges• Features continuous throughput to theIEEE 488 bus at 200 Kbytes/s (100,00016‑bit readings/s)• Offers memory expansion up to8 Mbytes (4 Msamples)• Analog inputs isolated from groundby 500 VCM• Includes eight TTL‑compatible digitalinputs and eight TTL digital outputs

ADC488/16A provides many of the features found in expensive digital oscilloscopes

Up to 13 IEEE 488 devices
SCSI 488/S

DAC488HR/2

The ADC488/16A enables high‑speed,
high‑resolution, analog voltage measurements via the IEEE 488 bus.

Filter488

ADC488/16A

High Resolution
The ADC488/16A features 16‑bit resolution, 96 dB dynamic range, and 33 µV/bit
sensitivity (at ±1V range). More expensive
scopes and waveform recorders typicallyprovide only 8‑ or 12‑bit resolution. Bycontrast, the ADC488/16A lets you detecteven small variations in signals with large­voltage ranges without having to ­constantly
reconfigure range and gain settings.

Wide BandwidthWith a 100 kHz sample rate, the ADC488/16A
can capture repetitive signals with bandwidths up to 50 kHz and transients as fast as
20 µs. Scan intervals from 10 µs to 50s provide
the flexibility to meet both high‑speed transient and low‑speed data logging applications.
Because the ADC488/16A can function as
both a high‑speed, digital voltmeter (DVM)
and a low‑speed, digital storage ­oscilloscope(DSO), it lets you acquire a wide range ofsignals with a single device.

IEEEADC488/16AIEEE 488
controller

8 DE/16 SE
analog inputs

8 digital 8 digital
outputs inputs

Triggering

Memory Expansion

The ADC488/16A offers a selection of programmable trigger sources, such as analog
input level, external TTL input*, IEEE 488
Group Execute Trigger (GET), and IEEE 488
TALK commands. Each trigger source caninitiate either single‑shot or continuous
acquisition modes.

The ADC488/A Series features a standard
4-Kbyte internal memory buffer, which is
optionally expandable by 8 Mbytes. Thisbuffer can be used either to store data­locally to free the host computer for othertasks, or as FIFO to double buffer data forcontinuous high‑speed throughput tothe IEEE 488 bus. Since the buffers are
field‑installable, they provide the ability
to add memory as needed.

Pre‑Trigger & Trigger Delay
The ADC488/A Series pre‑trigger function
can store data in up to 100 percent ofavailable memory and is ideally suited foranalyzing cause‑and‑effect situations. The
trigger‑delay command suspends actual
data acquisition, from the “real” trigger
point to an “effective” trigger point inmemory by up to 8,000 scans.

* External TTL trigger mode input clock frequency cannot exceed 40 kHz

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ADC488/16A & ADC488/8SA
Specifications & Ordering Information
High‑Speed Throughput

Specifications

The ADC488/A Series can output data continuously to the IEEE 488
bus and to disk at 200 Kbytes/s, permitting its use in long‑term,high‑speed data acquisition applications that exceed the storage
capacity of its internal memory modules*. Thus you can use theinexpensive mass‑storage of your PC or IEEE 488 controller forlarge amounts of data that previously required either expensive
mini or mainframe computers.

AnalogNumber of Channels: 16 single‑ended or 8 differential inputs
Conversion Rate: 100 kHz sampling, 16‑bit successive approximation A/DConversion Time: 8.1 µs typ
PGA Range/Resolution/Accuracy:
Range
Resolution
Accuracy (% of VFS)
±1V		
16 bit33 µV/bit±(0.02%)±2V		
16 bit
66 µV/bit±(0.02%)±5V		16 bit166 µV/bit±(0.02%)±10V		
16 bit333 µV/bit±(0.02%)
Maximum Allowable Input: 25V p‑p max
Temperature Coefficient: (±0.002% ±100 µV)/˚C; 0 to 20 ˚C and 30 to 50 ˚CA/D Acquisition Time: 1.8 µs typ
A/D Aperture Time: 25 ns typ
A/D Aperture Uncertainty: 0.25 ns typ
Common Mode Rejection: >70 dB from DC to 100 Hz
Common Mode Input Voltage: 13V max, 105 V‑Hz
Channel‑to‑Digital Low Isolation: 250V max, 105 V‑HzConnector: DB25 male connector; mating connector supplied

50-kHz maximum
input signal
bandwidth

ADC488/16A
ADC488/16A

8 Mbytemaximum
internal bufferIEEE
200 Kbytes/sthroughput via
the IEEE 488 bus

The ADC488A’s capacity for continuous
high‑speed data throughput eliminates
the need to choose between acquisition
rate or acquisition duration

IEEE controller

Digital I/O

200 Kbytes/s
throughput
to disk

Number of Inputs: 8 bits, TTL‑level compatible
Number of Outputs: 8 bits, TTL‑level compatible
Connector: 20‑pin card‑edge; mating connector supplied

IEEE 488 Interface

Large Mbyte
storage
capacity

Implementation: SH1, AH1, T6, TE4, L4, LE4, SR1, PP0, RL0, DC1, DT1, C0, and E1
Programmable Parameters: Single‑ended/differential configuration, buffer location, scan group, digital output, buffer mode, output format, trigger mode,
scan interval, EOI, trigger level, SRQ mask, scan count, configurations, channel,
pre‑trigger, and terminators
Data Transfer Speed: >200 Kbytes/s (uncompensated raw binary)Connector: Standard IEEE 488 connector with metric studs

Isolation
All ADC488/A analog circuitry is optically isolated from the digital
control logic, the IEEE 488 bus, and the AC power line by up to500 VCM. This reduces the risk of damage to the ADC488/A andthe controlling computer from signals with extreme ground differences. It also shields the ADC488/A’s 16‑bit circuitry from thepotentially high noise environment of the controlling computer,resulting in quieter and more accurate analog measurements.

GeneralStorage: 2 Ksample (4 Kbyte) buffer standard; 4 Msample (8 Mbyte) optional
Indicators: LEDs for Talk, Listen, SRQ, Error, Test, and PowerPower: 105 to 125 or 210 to 250 VAC, 50/60 Hz; 20 VA max
Environment: 0 to 50 ˚C; 0 to 95% RH, non‑condensing to 35 ˚C; linearly derate
3% RH/˚C from 35 to 50 ˚CControls: Power switch, external DIP switch for IEEE 488 address
Dimensions: 425 mm W x 203 mm D x 45 mm H (16.75” x 8” x 1.75”)
Weight: 3.2 kg (7 lbs)

Master/Slave Support
Up to four “slave” ADC488/As can be attached to a single master
ADC488/A to expand input capacity to either 80 single‑ended or
40 differential channels. A dedicated high‑speed trigger line ensures that all slave units are triggered within 250 ns of the master.

Ordering Information

Description
IEEE 488 analog to digital converter including
2 analog input connectors; a digital I/O port
connector; and rack-mount kit
Same as above except with simultaneous sample & hold,and 8 differential inputs

Support Software
The ADC488/A Series is easy to program using a series of ASCII
instructions. Because no specific language driver is required,
the ADC488/A works with Visual Basic®, C/C++, and any otherprogramming language which has the capability to send andreceived data over the IEEE 488 bus.

Part No.
ADC488/16A
ADC488/8SA

Accessories & Cables
4 Msample (8 Mbyte) memory option
Shielded IEEE 488 cable, 6 ft.

MEMX7
CA‑7‑3

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mccdaq.com* At the maximum 100 kHz sample rate, the standard 4-Kbyte buffer stores only
20 ms of data; the largest 8 Mbyte buffer stores 40 seconds of data

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