ADC78H90
ADC78H90 8-Channel, 500 kSPS, 12-Bit A/D Converter
Literature Number: SNAS227C
ADC78H90
8-Channel,500kSPS,12-Bit A/D Converter
General Description
The ADC78H90is a low-power,eight-channel CMOS 12-bit analog-to-digital converter with a conversion throughput of 500kSPS.The converter is bad 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 AIN1through AIN8.
The output rial data is straight binary,and is compatible with veral standards,such as SPI ™,QSPI ™,MICROW-IRE ™,and many common DSP rial interfaces.
The ADC78H90may be operated with independent analog and digital supplies.The analog supply (AV DD )can range from +2.7V to +5.25V,and the digital supply (DV DD )can range from +2.7V to AV DD .Normal power consumption using a +3V or +5V supply is 1.5mW and 8.3mW,respectively.The power-down feature reduces the power consumption to just 0.3µW using a +3V supply,or 0.5µW using a +5V supply.
The ADC78H90is packaged in a 16-lead TSSOP package.Operation over the industrial temperature range of −40˚C to +85˚C is guaranteed.
Features
n Eight input channels
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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 500kSPS n DNL ±1LSB (max)n INL
±1LSB (max)n
Power Consumption —3V Supply 1.5mW (typ)—5V Supply
8.3mW (typ)
Applications
n Automotive Navigation n Portable Systems n Medical Instruments n Mobile Communications
n
Instrumentation and Control Systems
Connection Diagram
20079305
Ordering Information
Order Code
Temperature Range Description
ADC78H90CIMT −40˚C to +85˚C 16-Lead TSSOP Package
ADC78H90CIMTX −40˚C to +85˚C
16-Lead TSSOP Package,Tape &Reel
ADC78H90EVAL
娄氏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.
©2005National Semiconductor Corporation
20079307
Pin Descriptions and Equivalent Circuits
Pin No.Symbol
Equivalent Circuit
Description
ANALOG I/O 4-11AIN1to AIN8Analog inputs.The signals can range from 0V to AV
DIGITAL I/O
16SCLK
Digital clock input.The range of frequencies for this in 50kHz to 8MHz,with guaranteed performance at 8M This clock directly controls the conversion and readou process.
15DOUT Digital data output.The output samples are clocked ou pin on falling edges of the SCLK pin.
14DIN Digital data input.The ADC78H90’s Control Register i loaded through this pin on rising edges of the SCLK p
1
CS
Chip lect.On the falling edge of CS,a conversion p begins.Conversions continue as long as CS is held lo
POWER SUPPLY
2
AV DD
Positive analog supply pin.This pin should be connec quiet +2.7V to +5.25V source and bypasd to GND w µF tantalum capacitor and a 0.1µF ceramic monolithic capacitor located within 1cm of the power pin.
13
DV DD
Positive digital supply pin.This pin should be connecte +2.7V to AV DD supply,and bypasd to GND with a 0ceramic monolithic capacitor located within 1cm of the pin.
3AGND The ground return for the analog supply and signals.12
DGND
The ground return for the digital supply and signals.
A D
2
plea contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Analog Supply Voltage AV DD−0.3V to6.5V Digital Supply Voltage DV DD−0.3V to AV DD+
0.3V,max6.5V Voltage on Any Pin to GND−0.3V to AV DD
+0.3V Input Current at Any Pin(Note3)±10mA Package Input Current(Note3)±20mA Power Dissipatio
n at T A=25˚C See(Note4) ESD Susceptibility(Note5)
Human Body Model Machine Model 2500V 250V
Soldering Temperature,Infrared,
10conds(Note6)260˚C Junction Temperature+150˚C Storage Temperature−65˚C to+150˚C
A
AV DD Supply Voltage+2.7V to+5.25V DV DD Supply Voltage+2.7V to AV DD Digital Input Pins Voltage Range-0.3V to AV DD Clock Frequency50kHz to8MHz Analog Input Voltage0V to AV DD
Package Thermal Resistance
PackageθJA
16-lead TSSOP on
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4-layer,2oz.PCB96˚C/W
ADC78H90Converter Electrical Characteristics(Note8)
The following specifications apply for AV DD=DV DD=+2.7V to5.25V,AGND=DGND=0V,f SCLK=8MHz,f SAMPLE=500 KSPS,unless otherwi noted.Boldface limits apply for T A=T MIN to T MAX:all other limits T A=25˚C.
Symbol Parameter Conditions Typical
Limits
(Note7)
Units
STATIC CONVERTER CHARACTERISTICS
Resolution with No Missing Codes12Bits INL Integral Non-Linearity AV DD=+5.0V,DV DD=+3.0V±1LSB(max) DNL Differential Non-Linearity AV DD=+5.0V,DV DD=+3.0V±1LSB(max) V OFF Offt Error AV DD=+5.0V,DV DD=+3.0V±2LSB(max) OEM Offt Error Match AV DD=+5.0V,DV DD=+3.0V±2LSB(max) GE Gain Error AV DD=+5.0V,DV DD=+3.0V±3LSB(max) GEM Gain Error Match AV DD=+5.0V,DV DD=+3.0V±3LSB(max) DYNAMIC CONVERTER CHARACTERISTICS
送给老师的一句话SINAD Signal-to-Noi Plus Distortion Ratio AV DD=+5.0V,DV DD=+3.0V,
f IN=40.2kHz,−0.02dBFS
7370dB(min)
SNR Signal-to-Noi Ratio AV DD=+5.0V,DV DD=+3.0V,
f IN=40.2kHz,−0.02dBFS
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7370.8dB(min)
THD Total Harmonic Distortion AV DD=+5.0V,DV DD=+3.0V,
f IN=40.2kHz,−0.02dBFS
−86−74dB(max)
SFDR Spurious-Free Dynamic Range AV DD=+5.0V,DV DD=+3.0V,
f IN=40.2kHz,−0.02dBFS
8875.6dB(min)
ENOB Effective Number of Bits AV DD=+5.0V,DV DD=+3.0V,11.811.3Bits(min)
Channel-to-Channel Crosstalk AV DD=+5.0V,DV DD=+3.0V,
f IN=40.2kHz
-82dB
IMD Intermodulation Distortion,Second
Order Terms
AV DD=+5.0V,DV DD=+3.0V,
f a=40.161kHz,f b=41.015kHz
-93dB Intermodulation Distortion,Third
Order Terms
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AV DD=+5.0V,DV DD=+3.0V,
f a=40.161kHz,f b=41.015kHz
-90dB
FPBW-3dB Full Power Bandwidth AV DD=+5V11MHz
AV DD=+3V8MHz
3
KSPS,unless otherwi noted.Boldface limits apply for T A =T MIN to T MAX :all other limits T A =25˚C.Symbol
Parameter
Conditions
Typical
Limits (Note 7)
U
ANALOG INPUT CHARACTERISTICS V IN Input Range 0to AV DD
I DCL DC Leakage Current ±1
µA
C INA
Input Capacitance
Track Mode 33Hold Mode
3
DIGITAL INPUT CHARACTERISTICS V IH Input High Voltage DV DD =+4.75Vto +5.25V 2.4V (
DV DD =+2.7V to +3.6V 2.1V (V IL Input Low Voltage DV DD =+2.7V to +5.25V 0.8
V (
I IN Input Current
V IN =0V or DV DD
±0.01
±1
µA C IND
Digital Input Capacitance
2
4
pF
亲子早教DIGITAL OUTPUT CHARACTERISTICS V OH Output High Voltage I SOURCE =200µA,DV DD =+2.7V to +5.25V DV DD −0.5
V (
V OL Output Low Voltage
I SINK =200µA
0.4
V (I OZH ,I OZL TRI-STATE ®Leakage Current ±1
µA C OUT
TRI-STATE ®Output Capacitance 2
4
pF
婚纱背后Output Coding
Straight (Natural)Binary
POWER SUPPLY CHARACTERISTICS (C L =10pF)AV DD ,DV DD
Analog and Digital Supply Voltages
AV DD ≥DV DD
2.7V (
5.25V (I A +I D
Total Supply Current,Normal Mode (Operational,CS low)
AV DD =DV DD =+4.75V to +5.25V,f SAMPLE =500kSPS,f IN =40kHz 1.65 2.3mA AV DD =DV DD =+2.7V to +3.6V,f SAMPLE =500kSPS,f IN =40kHz 0.5 2.3
mA
Total Supply Current,Shutdown (CS high)
AV DD =DV DD =+4.75V to +5.25V,f SAMPLE =0kSPS
200AV DD =DV DD =+2.7V to +3.6V,f SAMPLE =0kSPS
200P D
Power Consumption,Normal Mode (Operational,CS low)
\AV DD =DV DD =+4.75V to +5.25V 8.312mW
AV DD =DV DD =+2.7V to +3.6V 1.58.3mW
Power Consumption,Shutdown (CS high)
AV DD =DV DD =+4.75V to +5.25V 0.5µ
AV DD =DV DD =+2.7V to +3.6V
0.3
µ
AC ELECTRICAL CHARACTERISTICS f SCLK Maximum Clock Frequency 8
MHz
f SMIN Minimum Clock Frequency 50
k
f S Maximum Sample Rate 500KSPS t CONV Conversion Time 13
SCLK
DC SCLK Duty Cycle
50
40%
60%(
t ACQ
Track/Hold Acquisition Time Full-Scale Step Input
3SCLK
Throughput Time
Acquisition Time +Conversion Time
16SCLK
f RATE Throughput Rate 500kSPS
t AD
Aperture Delay
4
A D
4
