ADC128S022 Datasheet PDF - National Semiconductor
| Part Number | ADC128S022 | |
| Description | 12-Bit A/D Converter | |
| Manufacturers | National Semiconductor | |
| Logo |  |
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August 2005
www.DataSheet4U.com
ADC128S022
8-Channel, 50 kSPS to 200 kSPS, 12-Bit A/D Converter
General Description
The ADC128S022 is a low-power, eight-channel CMOS 12-
bit analog-to-digital converter specified for conversion
throughput rates of 50 kSPS to 200 kSPS. The converter is
based on a successive-approximation register architecture
with an internal track-and-hold circuit. It can be configured to
accept up to eight input signals at inputs IN0 through IN7.
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 ADC128S022 may be operated with independent ana-
log and digital supplies. The analog supply (VA) can range
from +2.7V to +5.25V, and the digital supply (VD) can range
from +2.7V to VA. Normal power consumption using a +3V or
+5V supply is 1.2 mW and 7.5 mW, respectively. The power-
down feature reduces the power consumption to 0.06 µW
using a +3V supply and 0.25 µW using a +5V supply.
The ADC128S022 is packaged in a 16-lead TSSOP pack-
age. Operation over the extended industrial temperature
range of −40˚C to +105˚C is guaranteed.
Features
n Eight input channels
n Variable power management
n Independent analog and digital supplies
n SPI™/QSPI™/MICROWIRE™/DSP compatible
n Packaged in 16-lead TSSOP
Key Specifications
n Conversion Rate
n DNL (VA = VD = 5.0 V)
n INL (VA = VD = 5.0 V)
n Power Consumption
— 3V Supply
— 5V Supply
50 kSPS to 200 kSPS
+1.0 / −0.7 LSB (max)
±1.0 LSB (max)
1.2 mW (typ)
7.5 mW (typ)
Applications
n Automotive Navigation
n Portable Systems
n Medical Instruments
n Mobile Communications
n Instrumentation and Control Systems
Connection Diagram
Ordering Information
Order Code
ADC128S022CIMT
ADC128S022CIMTX
ADC128S022EVAL
Temperature Range
−40˚C to +105˚C
−40˚C to +105˚C
20162705
Description
16-Lead TSSOP Package
16-Lead TSSOP Package, Tape & Reel
Evaluation Board
TRI-STATE® is a trademark of National Semiconductor Corporation.
MICROWIRE™ is a trademark of National Semiconductor Corporation.
QSPI™ and SPI™ are trademarks of Motorola, Inc.
© 2005 National Semiconductor Corporation DS201627
www.national.com
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ADC128S022 Converter Electrical Characteristics (Note 8) (Continued)
The following specifications apply for AGND = DGND = 0V, fSCLK = 0.8 MHz to 3.2 MHz, fSAMPLE = 50 kSPS to 200 kSPS, CL
= 50pF, unless otherwise noted. Boldface limits apply for TA = TMIN to TMAX: all other limits TA = 25˚C.
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Symbol
Parameter
Conditions
Typical
Limits
(Note 7)
Units
ANALOG INPUT CHARACTERISTICS
DIGITAL OUTPUT CHARACTERISTICS
VOH Output High Voltage
VOL Output Low Voltage
Hi-Impedance Output Leakage
IOZH, IOZL Current
ISOURCE = 200 µA,
VA = VD = +2.7V to +5.25V
ISINK = 200 µA to 1.0 mA,
VA = VD = +2.7V to +5.25V
VA = VD = +2.7V to +5.25V
VD − 0.5
0.4
±1
V (min)
V (max)
µA (max)
COUT
Hi-Impedance Output Capacitance
(Note 8)
2 4 pF (max)
Output Coding
Straight (Natural) Binary
POWER SUPPLY CHARACTERISTICS (CL = 10 pF)
VA, VD
Analog and Digital Supply Voltages VA ≥ VD
2.7
5.25
V (min)
V (max)
IA + ID
Total Supply Current
Normal Mode ( CS low)
Total Supply Current
Shutdown Mode (CS high)
Power Consumption
Normal Mode ( CS low)
PC
Power Consumption
Shutdown Mode (CS high)
AC ELECTRICAL CHARACTERISTICS
VA = VD = +2.7V to +3.6V,
fSAMPLE = 200 kSPS, fIN = 39.9 kHz
VA = VD = +4.75V to +5.25V,
fSAMPLE = 200 kSPS, fIN = 39.9 kHz
VA = VD = +2.7V to +3.6V,
fSCLK = 0 kSPS
VA = VD = +4.75V to +5.25V,
fSCLK = 0 kSPS
VA = VD = +3.0V
fSAMPLE = 200 kSPS, fIN = 39.9 kHz
VA = VD = +5.0V
fSAMPLE = 200 kSPS, fIN = 39.9 kHz
VA = VD = +3.0V
fSCLK = 0 kSPS
VA = VD = +5.0V
fSCLK = 0 kSPS
0.41
1.50
20
50
1.2
7.5
0.06
0.25
1.1 mA (max)
2.3 mA (max)
nA
nA
3.3 mW (max)
11.5
mW (max)
µW
µW
fSCLKMIN
fSCLK
fS
Minimum Clock Frequency
Maximum Clock Frequency
Sample Rate
Continuous Mode
VA = VD = +2.7V to +5.25V
VA = VD = +2.7V to +5.25V
VA = VD = +2.7V to +5.25V
16
1000
0.8 MHz (min)
3.2 MHz (max)
50 kSPS (min)
200 kSPS (max)
tCONVERT
DC
Conversion (Hold) Time
SCLK Duty Cycle
VA = VD = +2.7V to +5.25V
VA = VD = +2.7V to +5.25V
13 SCLK cycles
30 40 % (min)
70 60 % (max)
tACQ
tAD
Acquisition (Track) Time
Throughput Time
Aperture Delay
VA = VD = +2.7V to +5.25V
Acquisition Time + Conversion Time
VA = VD = +2.7V to +5.25V
VA = VD = +2.7V to +5.25V
4
3 SCLK cycles
16 SCLK cycles
ns
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| Information | Total 18 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ ADC128S022.PDF Datasheet ] | |
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