AD2S1200
Rev. 0 | Page 4 of 24
AD2S1200–SPECIFICATIONS
Table 1. (AV
DD
= DV
DD
= 5.0 V ± 5% @ −40°C to +125°C CLKIN 8.192 MHz, unless otherwise noted.)
Parameter Min Typ Max Unit Conditions/Comments
Sin, Cos INPUTS
1
Voltage 3.24 3.6 3.96 V p-p Sinusoidal waveforms, differential inputs
Input Bias Current 2 µA V
IN
= 3.96 V p-p
Input Impedance 1.0 MΩ V
IN
= 3.96 V p-p
Common Mode Volts 100 mV Peak CMV @ SinLO, CosLO, with respect to REFOUT @ 10 kHz
Phase Lock Range −45 +45 Degrees Sin/Cos vs. EXC output
ANGULAR ACCURACY
Angular Accuracy ±11 arc min Zero acceleration Y Grade
±22 arc min Zero acceleration W Grade
Resolution 12 Bits Guaranteed no missing codes
Linearity INL 2 LSB Zero acceleration, 0 to 1,000 rps
Linearity DNL 0.3 LSB Guaranteed monotonic
Repeatability 1 LSB
Hysteresis 1 LSB
VELOCITY OUTPUT
Velocity Accuracy 2 LSB Zero acceleration
Resolution 11 Bits
Linearity 1 LSB Guaranteed by design 2 LSB max
Offset 0 1 LSB Zero acceleration
Dynamic Ripple 1 LSB Zero acceleration
DYNAMIC PERFORMANCE
Bandwidth 1,500 1,700 2,000 Hz Fixed
Tracking Rate 1,000 rps Guaranteed by design. Tested to 800 rps.
Acceleration Error 30 arc min At 10,000 rps
2
Settling Time 179° Step Input 4.72 5.0 ms To within stated accuracy
Settling Time 179° Step Input 3.7 3.8 ms To within one degree
EXC, EXC OUTPUTS
Voltage 3.34 3.6 3.83 V p-p Load ±100 µA
Center Voltage 2.39 2.47 2.52 V
Frequency 10 kHz FS1 = high, FS2 = high
12 kHz FS1 = high, FS2 = low
15 kHz FS1 = low, FS2 = high
20 kHz FS1 = low, FS2 = low
EXC/EXC DC Mismatch
35 mV
THD −60 −55 dB First five harmonics
FAULT DETECTION BLOCK
LOS
Sin/Cos Threshold 2.86 2.92 3.0 V p-p
DOS and LOT go low when Sin or Cos fall below
threshold.
Angular Accuracy (Worst Case) 45 Degrees
LOS indicated before angular output error exceeds limit
(3.96 V p-p input signal and 2.9 V LOS threshold).
Angular Latency (Worst Case) 90 Degrees
Maximum electrical rotation before LOS is indicated
(3.96 V p-p input signal and 2.9 V LOS threshold).
Time Latency 125 µs
1
The voltages Sin, SinLO, Cos, and CosLO relative to AGND must always be between 0.2 V and AV
DD
.
