ADSP-21992_15 Datasheet, PDF (27/60 Pages) Analog Devices – Mixed-Signal DSP Controller with CAN

ADSP-21992
Table 14. Peripherals Electrical Characteristics—ADSP-21992BST
Parameter
Description
Min
Typ
Max
Unit
ANALOG-TO-DIGITAL CONVERTER
AC Specifications
SNR
SNRD
THD
CTLK
CMRR
PSRR
Signal-to-Noise Ratio¹
Signal-to-Noise and Distortion¹
Total Harmonic Distortion¹
Channel-Channel Crosstalk¹
Common-Mode Rejection Ratio¹
Power Supply Rejection Ratio¹
68
72
dB
68
71
dB
–78
–68
dB
–80
–66
dB
–74
–66
dB
0.05
0.2
%FSR
Accuracy
INL
DNL
Integral Nonlinearity¹
Differential Nonlinearity¹
±0.6
±2.0
LSB
±0.5
±1.25
LSB
No Missing Codes
Zero Error¹
Gain Error¹
12
1.25
2.5
0.5
1.5
Bits
%FSR
%FSR
Input Voltage
V_IN
C_IN
Conversion Time
Input Voltage Span
Input Capacitance²
2.0
V
10
pF
FCLK
ADC Clock Rate
20
MHz
t_CONV
VOLTAGE REFERENCE
Internal Voltage Reference³
Total Conversion Time All 8 Channels
725
ns
0.94
0.98
1.02
V
Output Voltage Tolerance
40
mV
Output Current
Load Regulation⁴
100
μA
–2
+0.5
+2
mV
Power Supply Rejection Ratio
–2
+0.5
+2
mV
Reference Input Resistance
8
kΩ
POWER-ON RESET
V_RST
V_HYST
Reset Threshold Voltage
Hysteresis Voltage
1.4
2.1
V
50
mV
1 _{In all cases, the input frequency to the ADC system is assumed to be <100 kHz.}
2 _{Analog input pins VIN0 to VIN7.}
3 _{These specifications are for operation of the internal voltage reference so that SENSE = REFCOM, with the default 1.0 V operating mode.}
4 _{Operation with full 0.1 mA load current. For optimal operation, it is recommended to buffer the VREF output voltage before using it in other parts of the system.}
Rev. A | Page 27 of 60 | August 2007