參數(shù)資料
型號: ADSP-21991
廠商: Analog Devices, Inc.
元件分類: 數(shù)字信號處理
英文描述: SigmaDSP 28-/56-Bit Audio Processor with Two ADCs and Four DACs
中文描述: SigmaDSP的28-/56-Bit音頻處理器雙ADC和4個DAC
文件頁數(shù): 21/44頁
文件大?。?/td> 589K
代理商: ADSP-21991
–21–
REV. 0
ADSP-21991
PERIPHERALS ELECTRICAL CHARACTERISTICS—ADSP-21991BST
Parameter
Min
Typ
Max
Unit
ANALOG-TO-DIGITAL CONVERTER
AC Specifications
SNR
SNRD
THD
CTLK
CMRR
PSRR
Accuracy
INL
DNL
No missing Codes
Zero Error
1
Gain Error
1
Input Voltage
V
IN
C
IN
Conversion Time
FCLK
t
CONV
VOLTAGE REFERENCE
Internal Voltage Reference
3
Output Voltage Tolerance
Output Current
Load Regulation
4
Power Supply Rejection Ratio
Reference Input Resistance
POWER ON RESET
V
RST
V
HYST
Signal-to-Noise Ratio
1
Signal-to-Noise and Distortion
1
Total Harmonic Distortion
1
Channel-Channel Crosstalk
1
Common-Mode Rejection Ratio
1
Power Supply Rejection Ratio
1
68
68
72
71
–78
–80
–74
0.05
dB
dB
dB
dB
dB
%FSR
–68
–66
–66
0.2
Integral Nonlinearity
1
Differential Nonlinearity
1
±
0.6
±
0.5
12
1.25
0.5
±
2.0
±
1.25
LSB
LSB
Bits
%FSR
%FSR
2.5
1.5
Input Voltage Span
Input Capacitance
2
2.0
10
V
pF
ADC Clock Rate
Total Conversion Time All 8 Channels
20
725
MHz
ns
0.94
0.98
40
100
+0.5
+0.5
8
1.02
V
mV
μ
A
mV
mV
k
–2
–2
+2
+2
Reset Threshold Voltage
Hysteresis Voltage
1.4
2.1
V
mV
50
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.
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