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ADC088S022 Datasheet

8-Bit A/D Converter

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September 2005
ADC088S022
8-Channel, 50 kSPS to 200 kSPS, 8-Bit A/D Converter
General Description
The ADC088S022 is a low-power, eight-channel CMOS 8-bit
analog-to-digital converter specified for conversion through-
put rates of 50 kSPS to 200 kSPS. The converter is based on
a successive-approximation register architecture with an in-
ternal 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
www.DataSheet4U.cwoimth several standards, such as SPI, QSPI, MICROW-
IRE, and many common DSP serial interfaces.
The ADC088S022 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 0.9 mW and 5.5 mW, respectively. The power-
down feature reduces the power consumption to 0.03 µW
using a +3V supply and 0.15 µW using a +5V supply.
The ADC088S022 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 = 2.7V to 5.25V)
n INL (VA = VD = 2.7V to 5.25V)
n Power Consumption
— 3V Supply
— 5V Supply
50 kSPS to 200 kSPS
±0.2 LSB (max)
±0.2 LSB (max)
0.9 mW (typ)
5.5 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
ADC088S022CIMT
ADC088S022CIMTX
ADC088S022EVAL
Temperature Range
−40˚C to +105˚C
−40˚C to +105˚C
20166705
Description
16-Lead TSSOP Package
16-Lead TSSOP Package, Tape & Reel
Evaluation Board
TRI-STATE® is a trademark of National Semiconductor Corporation.
MICROWIREis a trademark of National Semiconductor Corporation.
QSPIand SPIare trademarks of Motorola, Inc.
© 2005 National Semiconductor Corporation DS201667
www.national.com


National Semiconductor Electronic Components Datasheet

ADC088S022 Datasheet

8-Bit A/D Converter

No Preview Available !

Block Diagram
www.DataSheet4U.com
Pin Descriptions
Pin No.
ANALOG I/O
4 - 11
DIGITAL I/O
Symbol
IN0 to IN7
16 SCLK
15
14
1
POWER SUPPLY
DOUT
DIN
CS
2 VA
13 VD
3 AGND
12 DGND
20166707
Description
Analog inputs. These signals can range from 0V to VREF.
Digital clock input. The guaranteed performance range of
frequencies for this input is 8 MHz to 16 MHz. This clock
directly controls the conversion and readout processes.
Digital data output. The output samples are clocked out of this
pin on the falling edges of the SCLK pin.
Digital data input. The ADC088S022’s Control Register is
loaded through this pin on rising edges of the SCLK pin.
Chip select. On the falling edge of CS, a conversion process
begins. Conversions continue as long as CS is held low.
Positive analog supply pin. This voltage is also used as the
reference voltage. This pin should be connected to a quiet
+2.7V to +5.25V source and bypassed to GND with 1 µF and
0.1 µF monolithic ceramic capacitors located within 1 cm of
the power pin.
Positive digital supply pin. This pin should be connected to a
+2.7V to VA supply, and bypassed to GND with a 0.1 µF
monolithic ceramic capacitor located within 1 cm of the power
pin.
The ground return for the analog supply and signals.
The ground return for the digital supply and signals.
www.national.com
2


Part Number ADC088S022
Description 8-Bit A/D Converter
Maker National Semiconductor
Total Page 17 Pages
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