AD977ABRSZRL Datasheet AD977BRZ, AD977ARZ, AD977AARZ | P1-P3

REV. D

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reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

AD977/AD977A

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

Tel: 781/329-4700 World Wide Web Site: http://www.analog.com

Fax: 781/326-8703 © Analog Devices, Inc., 2000

16-Bit, 100 kSPS/200 kSPS

BiCMOS A/D Converter

FUNCTIONAL BLOCK DIAGRAM

PWRD

SYNC

DATACLK

DATA

REF

ANA

4k

DGND TAGR/CCS

DIG

AGND2

CAP

AGND1

SWITCHED

CAP ADC

AD977/

AD977A

R = 5k AD977

R = 2.5k AD977A

2.5V

REFERENCE

BUSY

SERIAL

DATA

INTERFACE

CONTROL LOGIC &

INTERNAL CALIBRATION CIRCUITRY

CLOCK

SB/BTC EXT/INT

FEATURES

Fast 16-Bit ADC

100 kSPS Throughput Rate—AD977

200 kSPS Throughput Rate—AD977A

Single 5 V Supply Operation

Power Dissipation 100 mW Max

Power-Down Mode 50 W

Input Ranges:

Unipolar; 0 V–10 V, 0 V–5 V and 0 V–4 V

Bipolar; 10 V, 5 V and 3.3 V

Choice of External or Internal 2.5 V Reference

High Speed Serial Interface

On-Chip Clock

20-Lead Skinny DIP or SOIC Package

28-Lead Skinny SSOP Package

GENERAL DESCRIPTION

The AD977/AD977A is a high speed, low power 16-bit A/D

converter that operates from a single 5 V supply. The AD977A

has a throughput rate of 200 kSPS whereas the AD977 has a

throughput rate of 100 kSPS. Each part contains a successive

approximation, switched capacitor ADC, an internal 2.5 V

reference, and a high speed serial interface. The ADC is factory

calibrated to minimize all linearity errors. The AD977/AD977A is

specified for full scale bipolar input ranges of ± 10 V, ±5 V and

± 3.3 V, and unipolar ranges of 0 V to 10 V, 0 V to 5 V and

0 V to 4 V.

The AD977/AD977A is comprehensively tested for ac param-

eters such as SNR and THD, as well as the more traditional dc

parameters of offset, gain and linearity.

PRODUCT HIGHLIGHTS

1. Fast Throughput

The AD977/AD977A is a high speed, 16-bit ADC based on

a factory calibrated switched capacitor architecture.

2. Single-Supply Operation

The AD977/AD977A operates from a single 5 V supply and

dissipates only 100 mW max.

3. Comprehensive DC and AC Specifications

In addition to the traditional specifications of offset, gain

and linearity, the AD977/AD977A is fully tested for SNR

and THD.

AD977/AD977A

–2–

REV. D

A Grade B Grade C Grade

Parameter Min Typ Max Min Typ Max Min Typ Max Unit

RESOLUTION 16 16 16 Bits

ANALOG INPUT

Voltage Range ±10 V, 0 V to 5 V, . . . (See Table II)

Impedance See Table II

Sampling Capacitance 40 40 40 pF

THROUGHPUT SPEED

Complete Cycle 10 10 10 µs

Throughput Rate 100 100 100 kHz

DC ACCURACY

Integral Linearity Error ± 3 ± 2.0 ± 3 LSB

Differential Linearity Error –2 +3 –1 +1.75 ± 2 LSB

No Missing Codes 15 16 15 Bits

Transition Noise

1.0 1.0 1.0 LSB

Full-Scale Error

3, 4

± 0.5 ± 0.25 ± 0.5 %

Full-Scale Error Drift ±7 ±7 ± 7 ppm/°C

Full-Scale Error

Ext. REF = 2.5 V ± 0.5 ± 0.25 ± 0.5 %

Full-Scale Error Drift

Ext. REF = 2.5 V ±2 ±2 ±2 ppm/°C

Bipolar Zero Error

Bipolar Ranges ± 10 ± 10 ± 15 mV

Bipolar Zero Error Drift

Bipolar Ranges ±2 ±2 ±2 ppm/°C

Unipolar Zero Error

Unipolar Ranges ± 10 ± 10 ± 10 mV

Unipolar Zero Error Drift

Unipolar Ranges ± 2 ± 2 ± 2 ppm/°C

Recovery to Rated Accuracy

After Power-Down

2.2 µF to CAP 1 1 1 ms

Power Supply Sensitivity

ANA

= V

DIG

= V

= 5 V ± 5% ± 8 ± 8 ± 8 LSB

AC ACCURACY

Spurious Free Dynamic Range

90 96 90 dB

Total Harmonic Distortion

–90 –96 –90 dB

Signal-to-(Noise+Distortion)

83 85 83 dB

–60 dB Input 27 28 27 dB

Signal-to-Noise

83 85 83 dB

Full Power Bandwidth

700 700 700 kHz

–3 dB Input Bandwidth 1.5 1.5 1.5 MHz

SAMPLING DYNAMICS

Aperture Delay 40 40 40 ns

Transient Response, Full-Scale Step 2 2 2 µs

Overvoltage Recovery

150 150 150 ns

REFERENCE

Internal Reference Voltage 2.48 2.5 2.52 2.48 2.5 2.52 2.48 2.5 2.52 V

Internal Reference Source Current 1 1 1 µA

External Reference Voltage Range

for Specified Linearity 2.3 2.5 2.7 2.3 2.5 2.7 2.3 2.5 2.7 V

External Reference Current Drain

Ext. REF = 2.5 V 100 100 100 µA

NOTES

LSB means Least Significant Bit. With a ± 10 V input, one LSB is 305 µV.

Typical rms noise at worst case transitions and temperatures.

Measured with fixed resistors as shown in Figures 11, 12 and 13. Adjustable to zero. Tested at room temperature.

Full-Scale Error is expressed as the % difference between the actual full-scale code transition voltage and the ideal full scale transition voltage, and includes the effect of offset

error. For bipolar input ranges, the Full-Scale Error is the worst case of either the –Full Scale or +Full Scale code transition voltage errors. For unipolar input ranges, Full-Scale

Error is with respect to the +Full-Scale code transition voltage.

External 2.5 V reference connected to REF.

= 20 kHz, 0.5 dB down unless otherwise noted.

All specifications in dB are referred to a full scale ± 10 V input.

Full-Power Bandwidth is defined as full-scale input frequency at which Signal-to-(Noise+Distortion) degrades to 60 dB, or 10 bits of accuracy.

Recovers to specified performance after a 2 × F

input overvoltage.

Specifications subject to change without notice.

AD977–SPECIFICATIONS

(–40C to +85C, F

= 100 kHz, V

DIG

= V

ANA

= 5 V, unless otherwise noted)

–3–REV. D

AD977/AD977A

A Grade B Grade C Grade

Parameter Min Typ Max Min Typ Max Min Typ Max Unit

RESOLUTION 16 16 16 Bits

ANALOG INPUT

Voltage Range ±10 V, 0 V to 5 V, . . . (See Table II)

Impedance See Table II

Sampling Capacitance 40 40 40 pF

THROUGHPUT SPEED

Complete Cycle 5 5 5 µs

Throughput Rate 200 200 200 kHz

DC ACCURACY

Integral Linearity Error ± 3 ± 2.0 ± 3 LSB

Differential Linearity Error –2 +3 –1 +1.75 ± 2LSB

No Missing Codes 15 16 15 Bits

Transition Noise

1.0 1.0 1.0 LSB

Full-Scale Error

3, 4

± 0.5 ± 0.25 ± 0.5 %

Full-Scale Error Drift ±7 ±7 ± 7 ppm/°C

Full-Scale Error

Ext. REF = 2.5 V ± 0.5 ± 0.25 ± 0.5 %

Full-Scale Error Drift

Ext. REF = 2.5 V ±2 ±2 ±2 ppm/°C

Bipolar Zero Error

Bipolar Ranges ± 10 ± 10 ± 15 mV

Bipolar Zero Error Drift

Bipolar Ranges ±2 ±2 ±2 ppm/°C

Unipolar Zero Error

Unipolar Ranges ± 10 ± 10 ± 10 mV

Unipolar Zero Error Drift

Unipolar Ranges ± 2 ± 2 ± 2 ppm/°C

Recovery to Rated Accuracy

After Power-Down

2.2 µF to CAP 1 1 1 ms

Power Supply Sensitivity

ANA

= V

DIG

= V

= 5 V ± 5% ± 8 ± 8 ± 8LSB

AC ACCURACY

Spurious Free Dynamic Range

90 96 90 dB

Total Harmonic Distortion

–90 –96 –90 dB

Signal-to-(Noise+Distortion)

83 85 83 dB

–60 dB Input 27 28 27 dB

Signal-to-Noise

83 85 83 dB

Full Power Bandwidth

1 1 1 MHz

–3 dB Input Bandwidth 2.7 2.7 2.7 MHz

SAMPLING DYNAMICS

Aperture Delay 40 40 40 ns

Transient Response, Full-Scale Step 1 1 1 µs

Overvoltage Recovery

150 150 150 ns

REFERENCE

Internal Reference Voltage 2.48 2.5 2.52 2.48 2.5 2.52 2.48 2.5 2.52 V

Internal Reference Source Current 1 1 1 µA

External Reference Voltage Range

for Specified Linearity 2.3 2.5 2.7 2.3 2.5 2.7 2.3 2.5 2.7 V

External Reference Current Drain

Ext. REF = 2.5 V 1.2 1.2 1.2 mA

NOTES

LSB means Least Significant Bit. With a ± 10 V input, one LSB is 305 µV.

Typical rms noise at worst case transitions and temperatures.

Measured with fixed resistors as shown in Figures 11, 12 and 13. Adjustable to zero. Tested at room temperature.

Full-Scale Error is expressed as the % difference between the actual full-scale code transition voltage and the ideal full scale transition voltage, and includes the effect of offset

error. For bipolar input ranges, the Full-Scale Error is the worst case of either the –Full Scale or +Full Scale code transition voltage errors. For unipolar input ranges, Full-Scale

Error is with respect to the +Full-Scale code transition voltage.

External 2.5 V reference connected to REF.

= 20 kHz, 0.5 dB down unless otherwise noted.

All specifications in dB are referred to a full scale ± 10 V input.

Full-Power Bandwidth is defined as full-scale input frequency at which Signal-to-(Noise+Distortion) degrades to 60 dB, or 10 bits of accuracy.

Recovers to specified performance after a 2 × F

input overvoltage.

Specifications subject to change without notice.

AD977A–SPECIFICATIONS

(–40C to +85C, F

= 200 kHz, V

DIG

= V

ANA

= 5 V, unless otherwise noted)

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AD977ABRSZRL

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Analog Devices Inc.

Description:

Analog to Digital Converters - ADC 16-Bit 200 kSPS Serial I/O

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AD977ABRSZRL

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