ADSP-21991 Datasheet, PDF (20/44 Pages) Analog Devices – Mixed Signal DSP Co

ADSP-21991
PERIPHERALS ELECTRICAL CHARACTERISTICS—ADSP-21991BBC
Parameter
Min
Typ
Max
Unit
ANALOG-TO-DIGITAL CONVERTER
AC Specifications
SNR
Signal-to-Noise Ratio¹
SNRD
Signal-to-Noise and Distortion¹
THD
Total Harmonic Distortion¹
CTLK
Channel-Channel Crosstalk¹
CMRR
Common-Mode Rejection Ratio¹
PSRR
Power Supply Rejection Ratio¹
Accuracy
INL
Integral Nonlinearity¹
DNL
Differential Nonlinearity¹
No missing Codes
Zero Error¹
Gain Error¹
Input Voltage
V_IN
C_IN
Conversion Time
Input Voltage Span
Input Capacitance²
FCLK
t_CONV
ADC Clock Rate
Total Conversion Time All 8 Channels
VOLTAGE REFERENCE
Internal Voltage Reference³
Output Voltage Tolerance
Output Current
Load Regulation⁴
Power Supply Rejection Ratio
Reference Input Resistance
POWER-ON RESET
V_RST
V_HYST
Reset Threshold Voltage
Hysteresis Voltage
68
66
0.94
–2
–2
1.4
72
71
–80
–80
–82
0.05
±0.6
±0.5
12
1.25
0.5
2.0
10
0.98
40
100
+0.5
+0.5
8
50
–66
–66
–66
0.2
±2.0
±1.25
2.5
1.5
18.75
773
1.02
+2
+2
2.1
dB
dB
dB
dB
dB
%FSR
LSB
LSB
Bits
%FSR
%FSR
V
pF
MHz
ns
V
mV
µA
mV
mV
kΩ
V
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.
–20–
REV. 0