Datasheet

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ADC0816, ADC0817

www.ti.com

SNAS527C –JUNE 1999–REVISED MARCH 2013

ADC0816/ADC0817 8-Bit μP Compatible A/D Converters

with16-Channel Multiplexer

Check for Samples: ADC0816, ADC0817

FEATURES

• Easy interface to all microprocessors

DESCRIPTION

The ADC0816, ADC0817 data acquisition component

• Operates ratiometrically or with 5 V

is a monolithic CMOS device with an 8-bit analog-to-

analog span adjusted voltage reference

digital converter,16-channel multiplexer and

• 16-channel multiplexer with latched control

microprocessor compatible control logic. The 8-bit

logic

A/D converter uses successive approximation as the

• Outputs meet TTL voltage level specifications

conversion technique. The converter features a high

impedance chopper stabilized comparator, a 256R

• 0V to 5V analog input voltage range with

voltage divider with analog switch tree and a

single 5V supply

successive approximation register. The 16-channel

• No zero or full-scale adjust required

multiplexer can directly access any one of 16-single-

• Standard hermetic or molded 40-pin MDIP

ended analog signals, and provides the logic for

package additional channel expansion. Signal conditioning of

any analog input signal is eased by direct access to

• Temperature range −40°C to +85°Cor −55°C to

the multiplexer output, and to the input of the 8-bit

+125°C

A/D converter.

• Latched TRI-STATE output

The device eliminates the need for external zero and

• Direct access to “comparator in” and

full-scale adjustments. Easy interfacing to

“multiplexer out” for signal conditioning

microprocessors is provided by the latched and

• ADC0816 equivalent to MM74C948

decoded multiplexer address inputs and latched TTL

TRI-STATE

outputs.

• ADC0817 equivalent to MM74C948-1

The design of the ADC0816, ADC0817 has been

KEY SPECIFICATIONS

optimized by incorporating the most desirable aspects

of several A/D conversion techniques. The

• Resolution ........................8 Bits

ADC0816,ADC0817 offers high speed, high

• Total Unadjusted Error....±½ LSB and ±1

accuracy, minimal temperature dependence,

• Single Supply....................5 V

excellent long-term accuracy and repeatability, and

consumes minima lpower. These features make this

• Low Power........................15 mW

device ideally suited to applications from process and

• Conversion Time..............100 µs

machine control to consumer and automotive

applications. For similar performance in an 8-channel,

28-pin, 8-bit A/D converter, see the ADC0808,

ADC0809 data sheet. (See AN-258 for more

information.)

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2TRI-STATE is a registered trademark of Texas Instruments.

3All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (18 pages)

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ADC0816, ADC0817 www.ti.
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ADC0816, ADC0817 SNAS527C – JUNE 1999 – REVISED MARCH 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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ADC0816, ADC0817 www.ti.com SNAS527C – JUNE 1999 – REVISED MARCH 2013 Absolute Maximum Ratings Supply Voltage (VCC) (1) (2) (3) 6.5V −0.3V to (VCC+0.3V) Voltage at Any Pin Except Control Inputs −0.3V to 15V Voltage at Control Inputs (START, OE, CLOCK, ALE, EXPANSION CONTROL, ADD A, ADD B, ADD C, ADD D) −65°C to +150°C Storage Temperature Range Package Dissipation at TA = 25°C 875 mW Lead Temp.
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ADC0816, ADC0817 SNAS527C – JUNE 1999 – REVISED MARCH 2013 www.ti.com Electrical Characteristics Converter Specifications: VCC = 5 VDC = VREF(+), VREF(−)= GND, VIN = VCOMPARATOR IN,TMIN ≤ TMAX and fCLK = 640 kHz unless otherwise stated. Symbol Parameter Conditions Min Typ Max Units ADC0816 Total Unadjusted Error 25°C ±½ LSB (1) TMIN to TMAX ±¾ LSB Total Unadjusted Error 0°C to 70°C ±1 LSB (1) TMIN to TMAX ±1¼ LSB VCC + 0.1 VDC VCC VCC+0.1 V VCC/2 VCC/2 + 0.
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ADC0816, ADC0817 www.ti.com SNAS527C – JUNE 1999 – REVISED MARCH 2013 Electrical Characteristics Digital Levels and DC Specifications: ADC0816CCN, ADC0817CCN—4.75V ≤ VCC ≤ 5.25V, −40°C ≤ TA ≤ +85°C unless otherwise noted. Symbol Parameter Conditions Min Typ Max Units 1.
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ADC0816, ADC0817 SNAS527C – JUNE 1999 – REVISED MARCH 2013 www.ti.com Electrical Characteristics Timing Specifications:VCC = VREF(+) = 5V, VREF(−) = GND, tr = tf = 20 ns and TA = 25°C unless otherwise noted.
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ADC0816, ADC0817 www.ti.com SNAS527C – JUNE 1999 – REVISED MARCH 2013 Additional single-ended analog signals can be multiplexed to the A/D converter by disabling all the multiplexer inputs using the expansion control. The additional external signals are connected to the comparator input and the device ground. Additional signal conditioning (i.e., prescaling, sample and hold, instrumentation amplification, etc.) may also be added between the analog input signal and the comparator input.
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ADC0816, ADC0817 SNAS527C – JUNE 1999 – REVISED MARCH 2013 www.ti.com Figure 4. Typical Error Curve Timing Diagram Figure 5. The successive approximation register (SAR) performs 8 iterations to approximate the input voltage. For any SAR type converter, n-iterations are required for an n-bit converter. Figure 2 shows a typical example of a 3-bit converter. In the ADC0816,ADC0817, the approximation technique is extended to 8 bits using the 256Rnetwork.
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ADC0816, ADC0817 www.ti.com SNAS527C – JUNE 1999 – REVISED MARCH 2013 Typical Performance Characteristics Figure 6. Comparator IIN vs. VIN (VCC = VREF = 5V) Figure 7. Multiplexer RON vs. VIN (VCC = VREF = 5V) spacer TRI-STATE Test Circuits and Timing Diagrams Figure 8.
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ADC0816, ADC0817 SNAS527C – JUNE 1999 – REVISED MARCH 2013 www.ti.com APPLICATION INFORMATION OPERATION Ratiometric Conversion The ADC0816, ADC0817 is designed as a complete Data Acquisition System (DAS) for ratiometric conversion systems. In ratiometric systems, the physical variable being measured is expressed as a percentage of full-scale which is not necessarily related to an absolute standard.
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ADC0816, ADC0817 www.ti.com SNAS527C – JUNE 1999 – REVISED MARCH 2013 Figure 9. Ratiometric Conversion System The ADC0816 needs less than a milliamp of supply current so developing the supply from the reference is readily accomplished. In Figure 11 a ground references system is shown which generates the supply from the reference.
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ADC0816, ADC0817 SNAS527C – JUNE 1999 – REVISED MARCH 2013 www.ti.com Figure 12. Typical Reference and Supply Circuit Figure 13.
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ADC0816, ADC0817 www.ti.com SNAS527C – JUNE 1999 – REVISED MARCH 2013 Analog Comparator Inputs The dynamic comparator input current is caused by the periodic switching of on-chip stray capacitances These are connected alternately to the output of the resistor ladder/switch tree network and to the comparator input as part of the operation of the chopper stabilized comparator. The average value of the comparator input current varies directly with clock frequency and with VIN as shown in Figure 6.
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ADC0816, ADC0817 SNAS527C – JUNE 1999 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision B (March 2013) to Revision C • 14 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
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MECHANICAL DATA NFJ0040A N0040A N40A (Rev E) www.ti.
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