16
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
Analog Devices AD7329
13-bit successive approximation type
Input ranges
Software-selectable
per channel
Differential: ±20 V, ±10 V, ±5 V (The voltage level on
each individual AIN input is limited to ±14 V.)
SE: ±10 V, ±5 V, ±2.5 V, 0 V to 10 V
Number of channels
4 differential, 8 single-ended
Software-selectable
Input configuration
Multiplexed
Channel gain queue
8 unique consecutive elements
Software-selectable range for each channel
Absolute maximum input
voltage
CHx IN to GND
±25 V max (power on)
±12 V max (power off)
Input impedance
35 MΩ min
Input bandwidth (–3 dB)
All input ranges
2 MHz typ
Input leakage current
±250 nA typ
Input capacitance
32 pf typ
Offset error drift
5 ppm/°C typ
Gain error drift
25 ppm/°C typ
Maximum working voltage
( common mode)
±20 V
±14 V
±10 V
±11 V
±5 V
±5.5 V
Sampling rate
1 S/s to 1 MS/s, software programmable
Sample clock source
Internal A/D clock or AICKI
Burst mode
Software-selectable, burst rate = 1µs
Throughput
Software paced
33 S/s to 4000 S/s typ, system dependent
Scan to PC memory
1 MS/s max
Resolution
13 bits
A/D no missing codes
(uncalibrated)
Differential mode
13 bits
Single-ended mode
12 bits
CMRR
60hz
74 dB typ
Crosstalk
SE mode, all ranges, 250 kHz
input signal
–62 dB typ
Differential mode, all ranges,
250 kHz input signal
–78 dB typ
