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ADSP-21990BBC датащи(PDF) 22 Page - Analog Devices

номер детали ADSP-21990BBC
подробное описание детали  Mixed-Signal DSP Controller
PDF  50 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

ADSP-21990BBC датащи(HTML) 22 Page - Analog Devices

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Rev. A
|
Page 22 of 50
|
August 2007
ADSP-21990
PERIPHERALS ELECTRICAL CHARACTERISTICS—ADSP-21990BBC
Parameter
Description
Min
Typ
Max
Unit
ANALOG-TO-DIGITAL CONVERTER
AC Specifications
SNR
Signal-to-Noise Ratio
1
1 In all cases, the input frequency to the ADC system is assumed to be <100 kHz.
68
71
dB
SNRD
Signal-to-Noise and Distortion
1
64
68
dB
THD
Total Harmonic Distortion
1
–72
–66
dB
CTLK
Channel-Channel Crosstalk1
–78
–66
dB
CMRR
Common-Mode Rejection Ratio1
–74
–66
dB
PSRR
Power Supply Rejection Ratio1
0.05
0.2
%FSR
Accuracy
INL
Integral Nonlinearity
1
±1.0
±2.0
LSB
DNL
Differential Nonlinearity
1
±0.5
±1.25
LSB
No Missing Codes
12
Bits
Zero Error1
1.25
2.5
%FSR
Gain Error1
0.5
1.5
%FSR
Input Voltage
VIN
Input Voltage Span
2.0
V
CIN
Input Capacitance
2
2 Analog input pins VIN0 to VIN7.
10
pF
Conversion Time
FCLK
ADC Clock Rate
18.75
MHz
tCONV
Total Conversion Time All 8 Channels
773
ns
VOLTAGE REFERENCE
Internal Voltage Reference3
3 These specifications are for operation of the internal voltage reference so that SENSE = REFCOM, with the default 1.0 V operating mode.
0.94
0.98
1.02
V
Output Voltage Tolerance
40
mV
Output Current
100
μA
Load Regulation
4
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.
0.5
2
mV
Power Supply Rejection Ratio
0.5
2
mV
Reference Input Resistance
8
k
Ω
POWER-ON-RESET
VRST
Reset Threshold Voltage
1.4
2.1
V
VHYST
Hysteresis Voltage
50
mV



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