Measurement Computing LGR-5320 Series - Manual (Page 29)

29
Chapter 4
Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog input
Table 1. Analog input specifications
Parameter Condition Specification
A/D converter 16-bit successive approximation type
Input ranges Software selectable per channel LGR-5327/5329: ±30 V, ±10 V, ±5 V, ±1 V
LGR-5325: ±10 V, ±5 V, ±1 V
Number of channels 8 differential (DIFF)/16 single-ended (SE),
software-selectable
Input configuration Multiplexed
Absolute maximum input voltage CHx_x to AGND LGR-5327/5329: ±38 V max(power on and
power off)
LGR-5325: ±25 V max(power on and power
off)
Input impedance ±30 V range
(LGR-5327/5329 only) 1
MΩ (power on),
1
GΩ (power off)
±10 V, ±5 V, ±1 V range 10
GΩ (power on)
1
GΩ (power off)
Input leakage current ±100 pA
Input capacitance ±30 V range (LGR-5327/5329) 90 pf (Note 2)
±10 V, ±5 V, ±1 V range 55 pf
Maximum working voltage
(signal+ common mode) ±30 V range ±30.05 V
±10 V, ±5 V, ±1 V range ±10.2 V
Common mode rejection ratio fin = 60 Hz, ±30 V range 65 dB min
fin = 60 Hz, all other ranges 75 dB min
Crosstalk DC to 25 kHz, adjacent DIFF
mode channels –80 dB
ADC resolution 16 bits
Input bandwidth (–3 dB) All input ranges 450 kHz min
Input coupling DC
Maximum sample rate LGR-5327/5329: 200 kS/s
LGR-5325: 100 kS/s
A/D pacing sources See Input sequencer section
Warm up time 30 minutes, min
Absolute accuracy All ranges 0.07% FSR
Noise DIFF mode 2 LSB rms
Note 1: Unused analog input channels can either be left floating or tied to an AGND pin.
Note 2: When using the ±30 V input range, keep source impedance and source capacitance as small as possible
to minimize settling time, gain, and bandwidth errors.