A/D Converter. AD977 Datasheet


AD977 Converter. Datasheet pdf. Equivalent


Part Number

AD977

Description

16-Bit/ 100 kSPS/200 kSPS BiCMOS A/D Converter

Manufacture

Analog Devices

Total Page 24 Pages
Datasheet
Download AD977 Datasheet


AD977
a
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
16-Bit, 100 kSPS/200 kSPS
BiCMOS A/D Converter
AD977/AD977A
FUNCTIONAL BLOCK DIAGRAM
REF
VANA AGND1
CAP
R1IN
R2IN
R3IN
4R
2R
R
4k
2.5V
REFERENCE
AD977/
AD977A
SERIAL
4R
SWITCHED
DATA
CAP ADC
INTERFACE
AGND2
VDIG
R = 5kAD977
R = 2.5kAD977A
CONTROL LOGIC &
INTERNAL CALIBRATION CIRCUITRY
CLOCK
SYNC
BUSY
DATACLK
DATA
DGND PWRD R/C CS TAG SB/BTC EXT/INT
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.
REV. D
Information furnished by Analog Devices is believed to be accurate and
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.
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

AD977
AD977/AD977A
AD977–SPECIFICATIONS (–40؇C to +85؇C, FS = 100 kHz, VDIG = VANA = 5 V, unless otherwise noted)
Parameter
A Grade
Min Typ Max
B Grade
Min Typ Max
C Grade
Min Typ Max
Unit
RESOLUTION
16
16
16 Bits
ANALOG INPUT
Voltage Range
Impedance
Sampling Capacitance
± 10 V, 0 V to 5 V, . . . (See Table II)
See Table II
40 40
40
pF
THROUGHPUT SPEED
Complete Cycle
Throughput Rate
10 10 10 µs
100 100 100 kHz
DC ACCURACY
Integral Linearity Error
Differential Linearity Error
No Missing Codes
Transition Noise2
Full-Scale Error3, 4
Full-Scale Error Drift
Full-Scale Error
Ext. REF = 2.5 V
Full-Scale Error Drift
Ext. REF = 2.5 V
Bipolar Zero Error3
Bipolar Ranges
Bipolar Zero Error Drift
Bipolar Ranges
Unipolar Zero Error3
Unipolar Ranges
Unipolar Zero Error Drift
Unipolar Ranges
Recovery to Rated Accuracy
After Power-Down5
2.2 µF to CAP
Power Supply Sensitivity
VANA = VDIG = VD = 5 V ± 5%
AC ACCURACY
Spurious Free Dynamic Range6
Total Harmonic Distortion6
Signal-to-(Noise+Distortion)6
–60 dB Input
Signal-to-Noise6
Full Power Bandwidth8
–3 dB Input Bandwidth
–2
15
1.0
±7
±2
±2
±2
±3
+3
± 0.5
± 0.5
± 10
± 10
1
±8
90
–90
83
27
83
700
1.5
–1
16
1.0
±7
±2
±2
±2
± 2.0
+1.75
± 0.25
± 0.25
± 10
± 10
1
96
85
28
85
700
1.5
±8
–96
±3
±2
15
1.0
± 0.5
±7
± 0.5
±2
± 15
±2
± 10
±2
1
±8
90
–90
83
27
83
700
1.5
LSB1
LSB
Bits
LSB
%
ppm/°C
%
ppm/°C
mV
ppm/°C
mV
ppm/°C
ms
LSB
dB7
dB
dB
dB
dB
kHz
MHz
SAMPLING DYNAMICS
Aperture Delay
Transient Response, Full-Scale Step
Overvoltage Recovery9
40
2
150
40
2
150
40
2
150
ns
µs
ns
REFERENCE
Internal Reference Voltage
Internal Reference Source Current
External Reference Voltage Range
for Specified Linearity
External Reference Current Drain
Ext. REF = 2.5 V
2.48 2.5
1
2.3 2.5
2.52
2.7
100
2.48 2.5
1
2.3 2.5
2.52
2.7
100
2.48 2.5 2.52
1
2.3 2.5 2.7
100
V
µA
V
µA
NOTES
1LSB means Least Significant Bit. With a ± 10 V input, one LSB is 305 µV.
2Typical rms noise at worst case transitions and temperatures.
3Measured with fixed resistors as shown in Figures 11, 12 and 13. Adjustable to zero. Tested at room temperature.
4Full-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.
5External 2.5 V reference connected to REF.
6fIN = 20 kHz, 0.5 dB down unless otherwise noted.
7All specifications in dB are referred to a full scale ± 10 V input.
8Full-Power Bandwidth is defined as full-scale input frequency at which Signal-to-(Noise+Distortion) degrades to 60 dB, or 10 bits of accuracy.
9Recovers to specified performance after a 2 × FS input overvoltage.
Specifications subject to change without notice.
–2– REV. D


Features a FEATURES Fast 16-Bit ADC 100 kSPS Thro ughput Rate—AD977 200 kSPS Throughput Rate—AD977A Single 5 V Supply Operat ion Power Dissipation 100 mW Max Power- Down Mode 50 ␮ W Input Ranges: Unipol ar; 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 Re ference High Speed Serial Interface On- Chip Clock 20-Lead Skinny DIP or SOIC P ackage 28-Lead Skinny SSOP Package CAP R1IN R2IN R3IN AGND2 VDIG 16-Bit, 100 kSPS/200 kSPS BiCMOS A/D Converter AD97 7/AD977A FUNCTIONAL BLOCK DIAGRAM REF 4 k⍀ 4R 2R R 4R SWITCHED CAP ADC VANA A GND1 2.5V REFERENCE AD977/ AD977A SYNC SERIAL DATA INTERFACE BUSY DATACLK DAT A R = 5k⍀ AD977 R = 2.5k⍀ AD977A C ONTROL LOGIC & INTERNAL CALIBRATION CIR CUITRY CLOCK DGND PWRD R/C CS TAG SB/BTC EXT/INT GENERAL DESCRIPTION P RODUCT HIGHLIGHTS The AD977/AD977A is a high speed, low power 16-bit A/D conv erter that operates from a single 5 V s upply. The AD977A has a throughput rate of 200 kSPS whereas the AD977 has a throughp.
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