User's Manual

12
Revision 1.1, Copyright © 2014, Impinj, Inc.
Table 5-8: Indy RS500 – Analog Interface Specification
Parameter
Min.
Typ.
Max.
Unit
Conditions
ADC (Pin 13)
Resolution
12
Bits
Conversion voltage range
1
3.3
V
Sampling rate
0.05
1
MSPs
Total conversion time
1
18
µsec
Power-up time
1
µsec
External input impedance
50
kΩ
Sampling switch resistance
1
kΩ
Internal sample and hold
capacitance
8
pF
Total unadjusted error
±3.3
±4
LSB
Offset error
±1.9
±2.8
LSB
Gain error
±2.8
±3
LSB
DNL error
±0.7
±1.3
LSB
INL error
±1.2
±1.7
LSB
DAC (Pin 16)
Resolution
12
Bits
Resistive load with buffer ON
5
kΩ
Impedance output with buffer OFF
15
kΩ
When the buffer is OFF, the
minimum resistive load
between DAC_OUT and V
SS
to
achieve 1% accuracy is
1.5 MΩ.
Capacitive load
50
pF
Maximum capacitive load at the
DAC_OUT pin when the buffer
is ON
Output voltage range
0.2
3.1
V
DNL
±2
LSB
INL
±4
LSB
Offset
±10
mV
Gain error
±0.5
%
Settling time
3
4
µsec
C
LOAD
< 50 pF & R
LOAD
> 5 kΩ