Measurement Computing

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USB-2600 Series

Specifications

Specifications

All specifications are subject to change without notice.

Typical for 25 °C unless otherwise specified.

Analog Input

A/D converter (ADC) type: Successive approximation; 16-bit resolution

Number of channels

USB-2623/USB-2627: 16 SE

USB-2633/USB-2637: 64 SE

Input voltage range: ±10 V

Absolute maximum input voltage

CHx relative to AGND: ±25 V max (power on), ±10.5 V max (power off)

Input impedance: 1 GΩ (power on), 390 Ω (power off)

Input bias current: ±100 pA

Input bandwidth: Small signal (–3 dB): 3.1 MHz

Input capacitance: 40 pf

Maximum working voltage: ±10.1 V max relative to AGND

Crosstalk

Adjacent channels, DC to 10 kHz: –80 dB

Input coupling: DC

Sample rate: 0.0149 S/s to 1,000 kS/s; software selectable

Trigger source: TTLTRG

A/D pacing: Internal input scan clock, external input scan clock (XAPCR)

Burst mode: Burst rate = 1 µs, software selectable,

Throughput

Software paced: 33 S/s to 4,000 S/s typ; system dependent

Hardware paced: 1 MS/s max

Channel queue

USB-2623/USB-2627: Up to 16 element list of random channels

USB-2633/USB-2637: Up to 64 element list of random channels

Warm-Up Time: 15 minutes min

Accuracy

Analog Input DC Voltage Measurement Accuracy

Range: ±10 V

Gain error (% of reading): 0.031

Offset error: 915 µV

INL error (% of Range): 0.0076

Absolute accuracy at full scale: 4775 µV

Gain temperature coefficient (% reading/°C): 0.0013

Offset temperature coefficient (µV/°C): 35

Noise Performance

For peak-to-peak noise distribution test, the input channel connects to AGND at the

input terminal block, and 32,000 samples are acquired at the maximum throughput.

Range: ±10 V

Counts: 8

LSBrms: 1.21

Settling Time for Multichannel Measurements

Range: ±10 V

1 µS settling accuracy (% FSR): 0.0152

5 µS settling accuracy (% FSR): 0.0061

10 µS settling accuracy (% FSR): 0.0015

Analog Input/Output Calibration

Recommended warm-up time: 15 minutes min

Calibration method: Self-calibration (firmware)

Calibration interval: 1 year (factory calibration)

AI calibration reference: 5 V, ±2.5 mV max. Measured values stored in EEPROM.

Tempco: 5 ppm/°C max

Long term stability: 15 ppm/1,000 hours

AO calibration procedure (USB-2627/USB-2637 only): Analog output pins

internally routed to the analog input circuit. For best results, disconnect any

XDACx connections at the I/O connectors before performing AOUT calibration.

Analog Output (USB-2627/USB-2637 Only)

Number of channels: 4; leave unused analog output channels disconnected.

Resolution: 16 bits

Output ranges (calibrated): ±10 V

Output transient

Host computer is reset, powered on, suspended, or a reset command is

issued to the device (analog outputs default to 0 V)

Duration: 100 ms

Amplitude: 2 V p-p

Powered Off

Duration: 100 ms

Amplitude: 5 V peak

Differential nonlinearity: ±0.25 LSB typ, ±1 LSB max

Output Current

XDACx pins: ±3.5 mA max

Output short-circuit protection

XDACx connected to AGND: Unlimited duration

Output coupling: DC

Power on and reset state

DACs cleared to zero-scale: 0 V, ±150 mV

Pacer source: Internal output scan clock and external output scan clock (XDPCR),

independent of external input scan clock (XAPCR)

Trigger sources: TTLTRIG (refer to the “External Trigger” specifications below)

Output update rate: 1 MS/s max; not affected by the number of scan channels

Settling time to rated accuracy, 10 V step: 2 µs

Slew rate: 20 V/µs

Throughput

Software paced: 33 S/s to 4,000 S/s typ, system-dependent

Hardware paced: 1 MS/s max, system-dependent

Calibrated Absolute Accuracy

Range: ±10 V

% of reading: ±0.0183

Offset: ±1.831

Offset Tempco: 12.7 µV/°C)

Gain Tempco: 13 ppm of range/°C)

Relative Accuracy (±LSB)

Range: ±10 V

Relative Accuracy (INL): 4.0 typ

Digital Input/Output

Digital type: TTL

Number of I/O: 24

Configuration: Three banks of 8. Bit-configurable as input or output.

Pull-up configuration: Each port has jumper- configurable 47 kΩ resistors.

Digital I/O transfer rate (system paced, asynchronous): 33 to 4,000 port reads/

writes or single bit reads/writes per second typ; system dependent.

Input high voltage: 2.0 V min, 5.0 V absolute max

Input low voltage: 0.8 V max, 0 V recommended min

Output high voltage: 4.4 V min (IOH = –50 µA),

3.76 V min (IOH = –24 mA)

Output low voltage: 0.1 V max (IOL = 50 µA)

0.44 V max (IOL = 24 mA)

Output current: 60 mA max, not to exceed 24 mA for one bit, resulting in 2.5 mA

max when all 24 bits are enabled.

External Trigger

Trigger source: TTLTRG

Trigger mode: edge or level sensitive, rising or falling edge, high or low level

Trigger latency: 1 µs + 1 clock cycle max

Trigger pulse width: 100 ns min

Input type: 33 Ω series resistor and 49.9 kΩ pull-down to GND

Input high voltage: 2.2 V min, 5.5 V absolute max

Input low voltage: 1.5 V max, –0.5 V absolute min, 0 V recommended min

External Clock

Terminal names: XAPCR, XDPCR

Terminal types: Input, active on rising edge

Terminal descriptions: Receives pacer clock from external source

Input clock rate: 1 MHz max

Clock pulse width: 100 ns min

Input type: 33 Ω series resistor, 47 kΩ pull-down to GND

Input high voltage: 2.2 V min, 5.5 V absolute max

Input low voltage: 1.5 V max, –0.5 V absolute min, 0 V recommended min