ADC78H89CIMT National Semiconductor, ADC78H89CIMT Datasheet

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ADC78H89CIMT

Manufacturer Part Number
ADC78H89CIMT
Description
IC, 12BIT ADC 500KSPS, POWERWISE
Manufacturer
National Semiconductor
Datasheet

Specifications of ADC78H89CIMT

Resolution (bits)
12bit
Input Channel Type
Single Ended
Data Interface
Serial, SPI
Supply Voltage Range - Analogue
2.7V To 5.25V
Supply Voltage Range - Digital
-0.3V To 5.25V, 2.7V To 5.25V
Sampling Rate
500kSPS
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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© 2005 National Semiconductor Corporation
ADC78H89
7-Channel, 500 KSPS, 12-Bit A/D Converter
General Description
The ADC78H89 is a low-power, seven-channel CMOS 12-bit
analog-to-digital converter with a conversion throughput of
500 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 seven
input signals on pins AIN1 through AIN7.
The output serial data is straight binary, and is compatible
with several standards, such as SPI
IRE
The ADC78H89 may be operated with independent analog
and digital supplies. The analog supply (AV
from +2.7V to +5.25V, and the digital supply (DV
range from +2.7V to AV
a +3V or +5V supply is 1.5 mW and 8.3 mW, respectively.
The power-down feature reduces the power consumption to
just 0.3 µW using a +3V supply, or 0.5 µW using a +5V
supply. The ADC78H89 is packaged in a 16-lead TSSOP
package. Operation over the industrial temperature range of
−40˚C to +85˚C is guaranteed.
Connection Diagram
Ordering Information
TRI-STATE
MICROWIRE
QSPI
ADC78H89CIMT
ADC78H89CIMTX
ADC78H89EVAL
, and many common DSP serial interfaces.
and SPI
®
is a trademark of National Semiconductor Corporation.
is a trademark of National Semiconductor Corporation.
are trademarks of Motorola, Inc.
Order Code
DD
. Normal power consumption using
, QSPI
DS200616
Temperature Range
−40˚C to +85˚C
−40˚C to +85˚C
DD
) can range
, MICROW-
DD
) can
Features
n Seven input channels
n Variable power management
n Independent analog and digital supplies
n SPI
n Packaged in 16-lead TSSOP
Key Specifications
n Conversion Rate
n DNL
n INL
n Power Consumption
Applications
n Automotive Navigation
n Portable Systems
n Medical Instruments
n Mobile Communications
n Instrumentation and Control Systems
— 3V Supply
— 5V Supply
/QSPI
16-Lead TSSOP Package, Tape & Reel
20061605
/MICROWIRE
16-Lead TSSOP Package
Evaluation Board
Description
/DSP compatible
±
±
www.national.com
1.5 mW (typ)
8.3 mW (typ)
1 LSB (max)
1 LSB (max)
March 2005
500 KSPS

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ADC78H89CIMT Summary of contents

Page 1

... The ADC78H89 is packaged in a 16-lead TSSOP package. Operation over the industrial temperature range of −40˚C to +85˚C is guaranteed. Connection Diagram Ordering Information Order Code ADC78H89CIMT ADC78H89CIMTX ADC78H89EVAL TRI-STATE ® trademark of National Semiconductor Corporation. MICROWIRE is a trademark of National Semiconductor Corporation. ™ ...

Page 2

Block Diagram Pin Descriptions and Equivalent Circuits Pin No. Symbol ANALOG I AIN1 to AIN7 2 NC DIGITAL I/O 16 SCLK 15 DOUT 14 DIN 1 CS POWER SUPPLY ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Analog Supply Voltage AV DD Digital Supply Voltage DV DD Voltage on Any Pin to GND Input Current at Any Pin (Note 3) Package Input Current (Note 3) Power Dissipation 25˚ ...

Page 4

ADC78H89 Converter Electrical Characteristics The following specifications apply for AV noted. Boldface limits apply for T A Symbol Parameter ANALOG INPUT CHARACTERISTICS V Input Range Leakage Current DCL C Input Capacitance INA DIGITAL INPUT CHARACTERISTICS V Input ...

Page 5

ADC78H89 Timing Specifications The following specifications apply for all other limits T A MIN MAX A Symbol Parameter t SCLK High to CS Fall Setup Time 1a t SCLK Low to CS Fall ...

Page 6

Timing Diagrams www.national.com FIGURE 1. ADC78H89 Operational Timing Diagram Timing Test Circuit ADC78H89 Serial Timing Diagram 6 20061651 20061608 20061606 ...

Page 7

Timing Diagrams (Continued) 20061650 SCLK and CS Timing Parameters 7 www.national.com ...

Page 8

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. APERTURE DELAY is the time between the fourth falling SCLK ...

Page 9

Typical Performance Characteristics kHz unless otherwise stated. DNL INL DNL vs. Supply T = +25˚ 500 KSPS SAMPLE 20061640 20061642 20061621 MHz 40.2 SCLK IN DNL 20061641 INL 20061643 INL vs. ...

Page 10

Typical Performance Characteristics kHz unless otherwise stated. (Continued) SNR vs. Supply ENOB vs. Supply THD vs. Input Frequency www.national.com T = +25˚ 500 KSPS SAMPLE 20061622 SNR vs. Input Frequency 20061633 ENOB vs. Input Frequency 20061624 ...

Page 11

Typical Performance Characteristics kHz unless otherwise stated. (Continued) Spectral Response Power Consumption vs. Throughput T = +25˚ 500 KSPS SAMPLE Spectral Response 20061630 20061644 MHz 40.2 SCLK IN 20061631 www.national.com ...

Page 12

Applications Information 1.0 USING THE ADC78H89 An operational timing diagram and a serial interface timing diagram for the ADC78H89 are shown in the Timing Dia- grams section chip select, which initiates conversions and frames the serial data transfers. ...

Page 13

Applications Information Bit 7 (MSB) Bit 6 DONTC DONTC Bit #: Symbol DONTC 5 ADD2 4 ADD1 3 ADD0 TABLE 2. Input Channel Selection ADD2 ADD1 ADD0 ...

Page 14

Applications Information 3.0 ADC78H89 TRANSFER FUNCTION The output format of the ADC89H89 is straight binary. Code transitions occur midway between successive integer LSB values. The LSB width for the ADC78H89 is AV The ideal transfer characteristic is shown in Figure ...

Page 15

Applications Information to sample AC signals, a band-pass or low-pass filter will reduce harmonics and noise, improving dynamic perfor- mance. 6.0 DIGITAL INPUTS AND OUTPUTS The ADC78H89’s digital inputs (SCLK, CS, and DIN) are limited by and cannot exceed the ...

Page 16

... Physical Dimensions inches (millimeters) unless otherwise noted Order Number ADC78H89CIMT, ADC78H89CIMTX National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. ...

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