AD7880BN Datasheet AD7880CRZ, AD7880BNZ, AD7880CNZ | P1-P3

REV. 0

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MOS Single +5 V Supply,

Low Power, 12-Bit Sampling ADC

AD7880

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700 Fax: 617/326-8703

FUNCTIONAL BLOCK DIAGRAM

–

SAMPLING

COMPARATOR

CONTROL

LOGIC

SAR +

COUNTER

CLKIN

CONVST

BUSY

MODE

LOW POWER

CONTROL

CIRCUIT

INA

INB

REF

AGND

DGND

DB0DB11

12-BIT DAC

AD7880

THREE

STATE

BUFFERS

FEATURES

12-Bit Monolithic A/D Converter

66 kHz Throughput Rate

12 ms Conversion Time

3 ms On-Chip Track/Hold Amplifier

Low Power

Power Save Mode: 2 mW typ

Normal Operation: 25 mW typ

70 dB SNR

Fast Data Access Time: 57 ns

Small 24-Lead SOIC and 0.3" DIP Packages

APPLICATIONS

Battery Powered Portable Systems

Digital Signal Processing

Speech Recognition and Synthesis

High Speed Modems

Control and Instrumentation

GENERAL DESCRIPTION

The AD7880 is a high speed, low power, 12-bit A/D converter

which operates from a single +5 V supply. It consists of a 3µs

track/hold amplifier, a 12 µs successive-approximation ADC,

versatile interface logic and a multiple-input-range circuit. The

part also includes a power save feature.

An internal resistor network allows the part to accept both uni-

polar and bipolar input signals while operating from a single

+5 V supply. Fast bus access times and standard control inputs

ensure easy interfacing to modern microprocessors and digital

signal processors.

The AD7880 features a total throughput time of 15 µs and can

convert full power signals up to 33 kHz with a sampling fre-

quency of 66 kHz.

In addition to the traditional dc accuracy specifications such as

linearity, full-scale and offset errors, the AD7880 is also fully

specified for dynamic performance parameters including har-

monic distortion and signal-to-noise ratio.

The AD7880 is fabricated in Analog Devices’ Linear Compat-

ible CMOS (LC

MOS) process, a mixed technology process

that combines precision bipolar circuits with low power CMOS

logic. The part is available in a 24-pin, 0.3 inch-wide, plastic or

hermetic dual-in-line package (DIP) as well as a small 24-lead

SOIC package.

PRODUCT HIGHLIGHTS

1. Fast Conversion Time.

12 µs conversion time and 3 µs acquisition time allow for

large input signal bandwidth. This performance is ideally

suited for applications in areas such as telecommunications,

audio, sonar and radar signal processing.

2. Low Power Consumption.

2 mW power consumption in the power-down mode makes

the part ideally suited for portable, hand held, battery pow-

ered applications.

3. Multiple Input Ranges.

The part features three user-determined input ranges, 0 V to

+5 V, 0 V to 10 V and ±5 V. These unipolar and bipolar

ranges are achieved with a 5 V only power supply.

AD7880* PRODUCT PAGE QUICK LINKS

Last Content Update: 02/23/2017

COMPARABLE PARTS

View a parametric search of comparable parts.

DOCUMENTATION

Data Sheet

• AD7880: CMOS, Single +5 V Supply, Low Power, 12-Bit

Sampling ADC Data Sheet

User Guides

• UG-356: Evaluating the ADE7880 Energy Metering IC

REFERENCE MATERIALS

Technical Articles

• MS-2210: Designing Power Supplies for High Speed ADC

DESIGN RESOURCES

• AD7880 Material Declaration

• PCN-PDN Information

• Quality And Reliability

• Symbols and Footprints

DISCUSSIONS

View all AD7880 EngineerZone Discussions.

SAMPLE AND BUY

Visit the product page to see pricing options.

TECHNICAL SUPPORT

Submit a technical question or find your regional support

number.

DOCUMENT FEEDBACK

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AD7880–SPECIFICATIONS

Parameter B Versions

C Versions

Units Test Conditions/Comments

DYNAMIC PERFORMANCE

Signal-to-Noise Ratio

(SNR) 70 70 dB min Typically SNR Is 72 dB

= 1 kHz Sine Wave, f

SAMPLE

= 66 kHz

Total Harmonic Distortion (THD) –80 –80 dB typ V

= 1 kHz Sine Wave, f

SAMPLE

= 66 kHz

Peak Harmonic or Spurious Noise –80 –80 dB typ V

= 1 kHz, f

SAMPLE

= 66 kHz

Intermodulation Distortion (IMD)

Second Order Terms –80 –80 dB typ fa = 0.983 kHz, fb = 1.05 kHz, f

SAMPLE

= 66 kHz

Third Order Terms –80 –80 dB typ fa = 0.983 kHz, fb = 1.05 kHz, f

SAMPLE

= 66 kHz

DC ACCURACY

Resolution 12 12 Bits All DC ACCURACY Specifications Apply for

the Three Analog Input Ranges

Integral Nonlinearity ±1 ±1 LSB max

Differential Nonlinearity ±1 ±1 LSB max Guaranteed Monotonic

Full-Scale Error ±15 ±5 LSB max

Bipolar Zero Error ±10 ±5 LSB max

Unipolar Offset Error ±5 ±5 LSB max

ANALOG INPUT

Input Voltage Ranges 0 to V

REF

0 to V

REF

Volts See Figure 5

0 to 2 V

REF

0 to 2 V

REF

Volts See Figure 6

±V

REF

±V

REF

Volts See Figure 7

Input Resistance 10 10 MΩ min 0 to V

REF

Range

5/12 5/12 kΩ min/max 8 kΩ typical: 0 to 2 V

REF

Range

5/12 5/12 kΩ min/max 8 kΩ typical: ±V

REF

Range

REFERENCE INPUT

REF

(For Specified Performance) 5 5 V ±5%: Normally V

REF

= V

(See Reference Input Section)

REF

1.5 1.5 mA max

Nominal Reference Range 2.5/V

2.5/V

V min/max See Figure 3 for Degradation in Performance Down to 2.5 V

LOGIC INPUTS

CONVST, RD, CS, CLKIN

Input High Voltage, V

INH

2.4 2.4 V min

Input Low Voltage, V

INL

0.8 0.8 V max

Input Current, I

±10 ±10 µA max V

= 0 V or V

Input Capacitance, C

10 10 pF max

MODE INPUT

Input High Voltage, V

INH

4 4 V min

Input Low Voltage, V

INL

1 1 V max

Input Current, I

±125 ±125 µA max V

= 0 V or V

Input Capacitance, C

10 10 pF max

LOGIC OUTPUTS

DB11–DB0, BUSY

Output High Voltage, V

4.0 4.0 V min I

SOURCE

= 400 µA

Output Low Voltage, V

0.4 0.4 V max I

SINK

= 1.6 mA

DB11–DB0

Floating-State Leakage Current ±10 ±10 µA max

Floating-State Output Capacitance

10 10 pF max

CONVERSION

Conversion Time 12 12 µs max f

CLKIN

= 2.5 MHz

Track/Hold Acquisition Time 3 3 µs max

POWER REQUIREMENTS

+5 +5 V nom ±5% for Specified Performance

Normal Power Mode @ +25°C 7.5 7.5 mA max Typically 4 mA; MODE = V

MIN

to T

MAX

10 10 mA max Typically 5 mA; MODE = V

Power Save Mode @ +25°C 750 750 µA max Logic Inputs @ 0 V or V

; MODE = 0 V

MIN

to T

MAX

1 1 mA max Logic Inputs @ 0 V or V

; MODE = 0 V

Power Dissipation

Normal Power Mode @ +25°C 37.5 37.5 mW max V

= 5 V: Typically 20 mW; MODE = V

MIN

to T

MAX

50 50 mW max V

= 5 V: Typically 25 mW; MODE = V

Power Save Mode @ +25°C 3.75 3.75 mW max V

= 5 V: Typically 2 mW; MODE = 0 V

MIN

to T

MAX

5 5 mW max V

= 5 V: Typically 2.5 mW; MODE = 0 V

NOTES

Temperature ranges are as follows: B/C Versions, –40°C to +85°C.

= 0 to V

REF

SNR calculation includes distortion and noise components.

Sample tested @ +25°C to ensure compliance.

Specifications subject to change without notice.

= +5 V 6 5%, V

REF

= V

, AGND = DGND = O V, f

CLKIN

= 2.5 MHz, MODE = V

unless otherwise noted. All Specifications T

MIN

to T

MAX

unless otherwise noted.)

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AD7880BN

Mfr. #:

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Manufacturer:

Analog Devices Inc.

Description:

Analog to Digital Converters - ADC CMOS SGL +5V Supply Lo Pwr 12B Sampling

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AD7880BN

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