adsp-21991 Analog Devices, Inc., adsp-21991 Datasheet - Page 20

• Manufacturer Part Number: adsp-21991
• Description: Mixed Signal Dsp Controller
• Manufacturer: Analog Devices, Inc.

ADSP-21991
PERIPHERALS ELECTRICAL CHARACTERISTICS—ADSP-21991BBC
1
2
3
4
Parameter
ANALOG-TO-DIGITAL CONVERTER
VOLTAGE REFERENCE
POWER-ON RESET
In all cases, the input frequency to the ADC system is assumed to be <100 kHz.
Analog Input Pins VIN0 to VIN7.
These specifications are for operation of the internal voltage reference so that SENSE = REFCOM, with the default 1.0 V operating mode.
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.
AC Specifications
SNR
SNRD
THD
CTLK
CMRR
PSRR
Accuracy
INL
DNL
No missing Codes
Zero Error
Gain Error
Input Voltage
V
C
Conversion Time
FCLK
t
Internal Voltage Reference
Output Voltage Tolerance
Output Current
Load Regulation
Power Supply Rejection Ratio
Reference Input Resistance
V
V
CONV
IN
RST
HYST
IN
1
1
4
3
Signal-to-Noise Ratio
Signal-to-Noise and Distortion
Total Harmonic Distortion
Channel-Channel Crosstalk
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Integral Nonlinearity
Differential Nonlinearity
Input Voltage Span
Input Capacitance
ADC Clock Rate
Total Conversion Time All 8 Channels
Reset Threshold Voltage
Hysteresis Voltage
2
1
1
–20–
1
1
1
1
1
1
Min
68
66
0.94
–2
–2
1.4
Typ
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
Max
–66
–66
–66
0.2
±2.0
±1.25
2.5
1.5
18.75
773
1.02
+2
+2
2.1
Unit
dB
dB
dB
dB
dB
%FSR
LSB
LSB
Bits
%FSR
%FSR
V
pF
MHz
ns
V
mV
µA
mV
mV
kΩ
V
mV
REV. 0