ADC081S021 Datasheet PDF - National Semiconductor

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ADC081S021
National Semiconductor

Part Number ADC081S021
Description 8-Bit A/D Converter
Page 17 Pages


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January 2006
ADC081S021
Single Channel, 50 to 200 ksps, 8-Bit A/D Converter
General Description
The ADC081S021 is a low-power, single channel CMOS
8-bit analog-to-digital converter with a high-speed serial in-
terface. Unlike the conventional practice of specifying per-
formance at a single sample rate only, the ADC081S021 is
fully specified over a sample rate range of 50 ksps to 200
ksps. The converter is based upon a successive-
approximation register architecture with an internal track-
and-hold circuit.
The output serial data is straight binary, and is compatible
with several standards, such as SPI, QSPI,
MICROWIRE, and many common DSP serial interfaces.
The ADC081S021 operates with a single supply that can
range from +2.7V to +5.25V. Normal power consumption
using a +3.6V or +5.25V supply is 1.3 mW and 7.7 mW,
respectively. The power-down feature reduces the power
consumption to as low as 2.6 µW using a +5.25V supply.
The ADC081S021 is packaged in 6-lead LLP and SOT-23
packages. Operation over the industrial temperature range
of −40˚C to +85˚C is guaranteed.
Features
n Specified over a range of sample rates.
n 6-lead LLP and SOT-23 packages
n Variable power management
n Single power supply with 2.7V - 5.25V range
n SPI/QSPI/MICROWIRE/DSP compatible
Key Specifications
n DNL
n INL
n SNR
n Power Consumption
— 3.6V Supply
— 5.25V Supply
+0.04/-0.03 LSB (typ)
+0.04/-0.03 LSB (typ)
49.6 dB (typ)
1.3 mW (typ)
7.7 mW (typ)
Applications
n Portable Systems
n Remote Data Acquisition
n Instrumentation and Control Systems
Pin-Compatible Alternatives by Resolution and Speed
All devices are fully pin and function compatible.
Resolution
Specified for Sample Rate Range of:
50 to 200 ksps
200 to 500 ksps
500 ksps to 1 Msps
12-bit
ADC121S021
ADC121S051
ADC121S101
10-bit
ADC101S021
ADC101S051
ADC101S101
8-bit
ADC081S021
ADC081S051
ADC081S101
Connection Diagram
Ordering Information
Order Code
ADC081S021CISD
ADC081S021CISDX
ADC081S021CIMF
ADC081S021CIMFX
ADC081S021EVAL
Temperature Range
−40˚C to +85˚C
−40˚C to +85˚C
−40˚C to +85˚C
−40˚C to +85˚C
TRI-STATE® is a trademark of National Semiconductor Corporation
QSPIand SPIare trademarks of Motorola, Inc.
© 2006 National Semiconductor Corporation DS201454
20145405
Description
6-Lead LLP Package
6-Lead LLP Package, Tape & Reel
6-Lead SOT-23 Package
6-Lead SOT-23 Package, Tape & Reel
SOT-23 Evaluation Board
Top Mark
X9C
X9C
X09C
X09C
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Block Diagram
20145407
Pin Descriptions and Equivalent Circuits
Pin No.
ANALOG I/O
3
DIGITAL I/O
4
Symbol
VIN
SCLK
5 SDATA
6 CS
POWER SUPPLY
1
2
PAD
VA
GND
GND
Description
Analog input. This signal can range from 0V to VA.
Digital clock input. This clock directly controls the conversion and readout processes.
Digital data output. The output samples are clocked out of this pin on falling edges of
the SCLK pin.
Chip select. On the falling edge of CS, a conversion process begins.
Positive supply pin. This pin should be connected to a quiet +2.7V to +5.25V source
and bypassed to GND with a 1 µF capacitor and a 0.1 µF monolithic capacitor located
within 1 cm of the power pin.
The ground return for the supply and signals.
For package suffix CISD(X) only, it is recommended that the center pad should be
connected to ground.
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Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Analog Supply Voltage VA
Voltage on Any Analog Pin to GND
Voltage on Any Digital Pin to GND
Input Current at Any Pin (Note 3)
Package Input Current (Note 3)
Power Consumption at TA = 25˚C
ESD Susceptibility (Note 5)
Human Body Model
Machine Model
Junction Temperature
Storage Temperature
−0.3V to 6.5V
−0.3V to (VA +0.3V)
−0.3V to 6.5V
±10 mA
±20 mA
See (Note 4)
3500V
300V
+150˚C
−65˚C to +150˚C
Operating Ratings (Notes 1, 2)
Operating Temperature Range
VA Supply Voltage
Digital Input Pins Voltage Range
(regardless of supply voltage)
Analog Input Pins Voltage Range
Clock Frequency
Sample Rate
−40˚C TA +85˚C
+2.7V to +5.25V
−0.3V to 5.25V
0V to VA
1 MHz to 4 MHz
up to 200 ksps
Package Thermal Resistance
Package
6-lead LLP
6-lead SOT-23
θJA
94˚C / W
265˚C / W
Soldering process must comply with National Semiconduc-
tor’s Reflow Temperature Profile specifications. Refer to
www.national.com/packaging. (Note 6)
ADC081S021 Converter Electrical Characteristics (Notes 7, 9)
The following specifications apply for VA = +2.7V to 5.25V, fSCLK = 1 MHz to 4 MHz, fSAMPLE = 50 ksps to 200 ksps,
CL = 15 pF, unless otherwise noted. Boldface limits apply for TA = TMIN to TMAX: all other limits TA = 25˚C.
Symbol
Parameter
Conditions
Typical
Limits
(Note 9)
Units
STATIC CONVERTER CHARACTERISTICS
Resolution with No Missing Codes
8 Bits
INL Integral Non-Linearity
VA = +2.7V to +3.6V
VA = +4.75V to +5.25V
±0.03
+0.04
−0.03
±0.3
±0.3
LSB (max)
LSB (max)
LSB (min)
DNL
Differential Non-Linearity
VA = +2.7V to +3.6V
VA = +4.75V to +5.25V
±0.03
+0.04
−0.03
±0.2
±0.2
LSB (max)
LSB (max)
LSB (min)
VOFF
GE
Offset Error
Gain Error
TUE
Total Unadjusted Error
VA = +2.7V to +3.6V
VA = +4.75V to +5.25V
VA = +2.7V to +3.6V
VA = +4.75V to +5.25V
VA = +2.7V to +3.6V
VA = +4.75V to +5.25V
−0.01
+0.03
+0.04
+0.1
+0.055
−0.065
+0.03
−0.06
±0.2
±0.2
±0.4
±0.4
±0.3
±0.3
LSB (max)
LSB (max)
LSB (max)
LSB (max)
LSB (max)
LSB (min)
LSB (max)
LSB (min)
DYNAMIC CONVERTER CHARACTERISTICS
SINAD
SNR
THD
SFDR
ENOB
Signal-to-Noise Plus Distortion Ratio
Signal-to-Noise Ratio
Total Harmonic Distortion
Spurious-Free Dynamic Range
Effective Number of Bits
VA = +2.7 to 5.25V
fIN = 100 kHz, −0.02 dBFS
VA = +2.7 to 5.25V
fIN = 100 kHz, −0.02 dBFS
VA = +2.7 to 5.25V
fIN = 100 kHz, −0.02 dBFS
VA = +2.7 to 5.25V
fIN = 100 kHz, −0.02 dBFS
VA = +2.7 to 5.25V
fIN = 100 kHz, −0.02 dBFS
49.5
49.6
−77
68
7.9
49 dBFS (min)
49 dBFS (min)
−65 dBFS (max)
65 dBFS (min)
7.8 Bits (min)
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ADC081S021 Converter Electrical Characteristics (Notes 7, 9) (Continued)
The following specifications apply for VA = +2.7V to 5.25V, fSCLK = 1 MHz to 4 MHz, fSAMPLE = 50 ksps to 200 ksps,
CL = 15 pF, unless otherwise noted. Boldface limits apply for TA = TMIN to TMAX: all other limits TA = 25˚C.
Symbol
Parameter
Conditions
Typical
Limits
(Note 9)
Units
DYNAMIC CONVERTER CHARACTERISTICS
Intermodulation Distortion, Second
Order Terms
IMD
Intermodulation Distortion, Third
Order Terms
FPBW -3 dB Full Power Bandwidth
ANALOG INPUT CHARACTERISTICS
VA = +5.25V
fa = 103.5 kHz, fb = 113.5 kHz
VA = +5.25V
fa = 103.5 kHz, fb = 113.5 kHz
VA = +5V
VA = +3V
−83
−82
11
8
dBFS
dBFS
MHz
MHz
VIN
IDCL
CINA
Input Range
DC Leakage Current
Input Capacitance
Track Mode
Hold Mode
0 to VA
30
4
±1
V
µA (max)
pF
pF
DIGITAL INPUT CHARACTERISTICS
VIH Input High Voltage
VIL Input Low Voltage
IIN Input Current
CIND
Digital Input Capacitance
DIGITAL OUTPUT CHARACTERISTICS
VA = +5.25V
VA = +3.6V
VA = +5V
VA = +3V
VIN = 0V or VA
2.4 V (min)
2.1 V (min)
0.8 V (max)
0.4 V (max)
±0.1 ±1 µA (max)
2 4 pF (max)
VOH
VOL
IOZH,
IOZL
COUT
Output High Voltage
Output Low Voltage
TRI-STATE® Leakage Current
TRI-STATE® Output Capacitance
Output Coding
ISOURCE = 200 µA
ISOURCE = 1 mA
ISINK = 200 µA
ISINK = 1 mA
VA − 0.07
VA − 0.1
0.03
0.1
VA − 0.2
0.4
V (min)
V
V (max)
V
±0.1 ±10 µA (max)
2 4 pF (max)
Straight (Natural) Binary
POWER SUPPLY CHARACTERISTICS
VA Supply Voltage
2.7
5.25
V (min)
V (max)
Supply Current, Normal Mode
(Operational, CS low)
IA
Supply Current, Shutdown (CS high)
Power Consumption, Normal Mode
(Operational, CS low)
PD Power Consumption, Shutdown (CS
high)
AC ELECTRICAL CHARACTERISTICS
VA = +5.25V,
fSAMPLE = 200 ksps
VA = +3.6V,
fSAMPLE = 200 ksps
fSCLK = 0 MHz, VA = +5.25V
fSAMPLE = 0 ksps
VA = +5.25V, fSCLK = 4 MHz,
fSAMPLE = 0 ksps
VA = +5.25V
VA = +3.6V
fSCLK = 0 MHz, VA = +5.25V
fSAMPLE = 0 ksps
fSCLK = 4 MHz, VA = +5.25V,
fSAMPLE = 0 ksps
1.47
0.36
500
60
7.7
1.3
2.6
315
2.2
0.9
11.6
3.24
mA (max)
mA (max)
nA
µA
mW (max)
mW (max)
µW
µW
fSCLK
Clock Frequency
(Note 8)
1.0 MHz (min)
4.0 MHz (max)
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