ADC081S101EVAL National Semiconductor, ADC081S101EVAL Datasheet

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ADC081S101EVAL

Manufacturer Part Number
ADC081S101EVAL
Description
BOARD EVALUATION FOR ADC081S101
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheet

Specifications of ADC081S101EVAL

Number Of Adc's
1
Number Of Bits
8
Sampling Rate (per Second)
1M
Data Interface
Serial
Inputs Per Adc
1 Single Ended
Input Range
0 ~ 5.25 V
Power (typ) @ Conditions
10mW @ 1MSPS
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 85°C
Utilized Ic / Part
ADC081S101
Lead Free Status / RoHS Status
Not applicable / Not applicable
© 2010 National Semiconductor Corporation
Single Channel, 0.5 to 1 Msps, 8-Bit A/D Converter
General Description
The ADC081S101 is a low-power, single channel CMOS 8-
bit analog-to-digital converter with a high-speed serial inter-
face. Unlike the conventional practice of specifying perfor-
mance at a single sample rate only, the ADC081S101 is fully
specified over a sample rate range of 500 ksps to 1 Msps. 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 ADC081S101 operates with a single supply that can
range from +2.7V to +5.25V. Normal power consumption us-
ing a +3V or +5V supply is 2.0 mW and 10.0 mW, respectively.
The power-down feature reduces the power consumption to
just 2.5 µW using a +5V supply.
The ADC081S101 is packaged in an 6-lead LLP and SOT-23
packages. Operation over the industrial temperature range of
−40°C to +85°C is guaranteed.
Pin-Compatible Alternatives by Resolution and Speed
All devices are fully pin and function compatible.
Connection Diagram
Ordering Information
TRI-STATE
ADC081S101CISD
ADC081S101CISDX
ADC081S101CIMF
ADC081S101CIMF
ADC081S101EVAL
®
is a registered trademark of National Semiconductor Corporation.
Resolution
Order Code
12-bit
10-bit
8-bit
50 to 200 ksps
ADC121S021
ADC101S021
ADC081S021
Temperature Range
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
201457
ADC081S101
Specified for Sample Rate Range of:
200 to 500 ksps
Features
Key Specifications
Applications
6-Lead SOT-23 Package, Tape and Reel
ADC121S051
ADC101S051
ADC081S051
Specified over a range of sample rates.
6-lead LLP and SOT-23 packages
Variable power management
Single power supply with 2.7V - 5.25V range
SPI™/QSPI™/MICROWIRE/DSP compatible
DNL
INL
SNR
Power Consumption
— 3V Supply
— 5V Supply
Portable Systems
Remote Data Aquisitions
Instrumentation and Control Systems
6-Lead LLP Package, Tape & Reel
SOT-23 Evaluation Board
6-Lead SOT-23 Package
6-Lead LLP Package
20145705
Description
500 ksps to 1 Msps
ADC121S101
ADC101S101
ADC081S101
January 13, 2010
± 0.07 LSB (typ)
± 0.05 LSB (typ)
10.0 mW (typ)
www.national.com
Top Mark
49.7 dB (typ)
2.0 mW (typ)
X03C
X03C
X3C
X3C

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ADC081S101EVAL Summary of contents

Page 1

... ADC101S021 8-bit ADC081S021 Connection Diagram Ordering Information Order Code ADC081S101CISD ADC081S101CISDX ADC081S101CIMF ADC081S101CIMF ADC081S101EVAL TRI-STATE ® registered trademark of National Semiconductor Corporation. © 2010 National Semiconductor Corporation ADC081S101 Features ■ Specified over a range of sample rates. ■ 6-lead LLP and SOT-23 packages ■ ...

Page 2

Block Diagram Pin Descriptions and Equivalent Circuits Pin No. Symbol ANALOG I/O V Analog input. This signal can range from DIGITAL I/O 4 SCLK Digital clock input. This clock directly controls the conversion and readout ...

Page 3

... Absolute Maximum Ratings 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Analog Supply Voltage V A Voltage on Any Pin to GND Input Current at Any Pin (Note 3) Package Input Current (Note 3) Power Consumption 25°C ...

Page 4

Symbol Parameter DIGITAL INPUT CHARACTERISTICS V Input High Voltage IH V Input Low Voltage IL I Input Current IN C Digital Input Capacitance IND DIGITAL OUTPUT CHARACTERISTICS V Output High Voltage OH V Output Low Voltage ...

Page 5

ADC081S101 Timing Specifications The following specifications apply for 500 ksps to 1 Msps, Boldface limits apply for T SAMPLE Symbol Parameter t Minimum CS Pulse Width SCLK Setup Time SU Delay from CS ...

Page 6

Timing Diagrams www.national.com FIGURE 1. Timing Test Circuit FIGURE 2. ADC081S101 Serial Timing Diagram 6 20145708 20145706 ...

Page 7

Specification Definitions ACQUISITION TIME is the time required to acquire the input voltage. That is time required for the hold capacitor to charge up to the input voltage. Acquisition time is measured backwards from the falling edge of ...

Page 8

Typical Performance Characteristics T = +25° 500 ksps to 1 Msps SAMPLE DNL MHz SCLK DNL MHz SCLK DNL vs Clock Frequency www.national.com = 10 MHz to 20 MHz, f ...

Page 9

Total Unadjusted Error vs Clock Frequency SINAD vs. Clock Frequency SFDR vs. Clock Frequency SNR vs Clock Frequency 20145767 THD vs. Clock Frequency 20145764 Spectral Response 20145772 9 20145763 20145768 = MHz SCLK 20145769 ...

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Spectral Response MHz SCLK www.national.com = 5V Power Consumption vs. Throughput, A 20145770 MHz SCLK 20145771 ...

Page 11

Applications Information 1.0 ADC081S101 OPERATION The ADC081S101 is a successive-approximation analog-to- digital converter designed around a charge-redistribution dig- ital-to-analog converter core. Simplified schematics of the ADC081S101 in both track and hold operation are shown in Figures 3 and 4, respectively. ...

Page 12

... TYPICAL APPLICATION CIRCUIT A typical application of the ADC is shown in is provided in this example by the National Semiconductor LP2950 low-dropout voltage regulator, available in a variety of fixed and adjustable output voltages. The power supply pin is bypassed with a capacitor network located close to the ADC ...

Page 13

ANALOG INPUT An equivalent circuit for the ADC's input channel is shown in Figure 7. Diodes D1 and D2 provide ESD protection for the analog inputs time should any input go beyond (V 300 mV) or (GND ...

Page 14

To exit shutdown mode, bring CS back low. Upon bringing CS low, the ADC will begin powering up (power-up time is specified in the Timing Specifications table). This power-up delay results in the first conversion result being unusable. The second ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted Order Number ADC081S101CISD or ADC081S101CISDX Order Number ADC081S101CIMF, ADC081S101CIMFX 6-Lead LLP NS Package Number SDB06A 6-Lead SOT-23 NS Package Number MF06A 15 www.national.com ...

Page 16

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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