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ADC128S102 Datasheet

12-Bit A/D Converter

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August 2005
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ADC128S102
8-Channel, 500 kSPS to 1 MSPS, 12-Bit A/D Converter
General Description
The ADC128S102 is a low-power, eight-channel CMOS 12-
bit analog-to-digital converter specified for conversion
throughput rates of 500 kSPS to 1 MSPS. 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, MICROW-
IRE, and many common DSP serial interfaces.
The ADC128S102 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 2.3 mW and 10.7 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 ADC128S102 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
500 kSPS to 1 MSPS
+1.5 / −0.9 LSB (max)
±1.2 LSB (max)
2.3 mW (typ)
10.7 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
ADC128S102CIMT
ADC128S102CIMTX
ADC128S102EVAL
Temperature Range
−40˚C to +105˚C
−40˚C to +105˚C
20136105
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 DS201361
www.national.com


National Semiconductor Electronic Components Datasheet

ADC128S102 Datasheet

12-Bit A/D Converter

No Preview Available !

Block Diagram
www.DataSheet4U.com
20136107
Pin Descriptions and Equivalent Circuits
Pin No.
ANALOG I/O
4 - 11
DIGITAL I/O
Symbol
IN0 to IN7
16 SCLK
15 DOUT
14 DIN
1 CS
POWER SUPPLY
2 VA
13 VD
3 AGND
12 DGND
Equivalent Circuit
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 ADC128S102’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 ADC128S102
Description 12-Bit A/D Converter
Maker National Semiconductor
Total Page 18 Pages
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