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AD976ACRZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
REV. C
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.
a
AD976/AD976A
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., 1999
16-Bit, 100 kSPS/200 kSPS
BiCMOS A/D Converters
FUNCTIONAL BLOCK DIAGRAM
REF
V
ANA
4kV
R
D15
D0
DGND
BYTE
R/C
CS BUSY
V
DIG
V
IN
AGND2
CAP
AGND1
2.5V
REFERENCE
4R
CONTROL LOGIC &
INTERNAL CALIBRATION CIRCUITRY
CLOCK
PARALLEL
INTERFACE
SWITCHED
CAP ADC
AD976/AD976A
4R
3
R = 6kV AD976
R = 3kV AD976A
FEATURES
Fast 16-Bit ADC
200 kSPS Throughput – AD976A
100 kSPS Throughput – AD976
Single 5 V Supply Operation
Input Range: ⴞ10 V
100 mW Max Power Dissipation
Choice of External or Internal 2.5 V Reference
High Speed Parallel Interface
On-Chip Clock
28-Lead Skinny DIP, SSOP or SOIC Packages
GENERAL DESCRIPTION
The AD976/AD976A is a high speed, low power 16-bit A/D
converter that operates from a single 5 V supply. The part con-
tains a successive approximation, switched capacitor ADC, an
internal 2.5 V reference and a high speed parallel interface. The
ADC is factory calibrated to minimize all linearity errors. The
analog full-scale input is the standard industrial range of ±10 V.
The AD976/AD976A is comprehensively tested for ac param-
eters such as SNR and THD, as well as the more traditional
parameters of offset, gain and linearity.
The AD976/AD976A is fabricated on Analog Devices’ propri-
etary BiCMOS process, which has high performance bipolar
devices along with CMOS transistors.
The AD976/AD976A is available in skinny 28-lead DIP, SSOP
and SOIC packages.
PRODUCT HIGHLIGHTS
1. Fast Throughput.
The AD976/AD976A is a high speed (100 kSPS/200 kSPS
throughput rates respectively), 16-bit ADC based on a
switched capacitor architecture.
2. Single-Supply Operation.
The AD976/AD976A operates from a single 5 V supply and
dissipates only 100 mW max.
3. Comprehensive DC and AC Specifications.
The AD976/AD976A is factory calibrated and fully tested for
SNR and THD as well as the traditional specifications of
offset, gain and linearity.
4. Complete A/D Solution.
The AD976/AD976A offers a highly integrated solution
containing an accurate ADC, reference and on-chip clock.
AD976/AD976A
–2–
REV. C
AD976A–SPECIFICATIONS
AD976AA AD976AB AD976AC
Parameter Min Typ Max Min Typ Max Min Typ Max Units
RESOLUTION 16 16 16 Bits
ANALOG INPUT
Voltage Range ±10 ±10 ±10 V
Impedance 13 13 13 kΩ
Capacitance 22 22 22 pF
THROUGHPUT SPEED
Complete Cycle 5 5 5 µs
Throughput Rate 200 200 200 kHz
DC ACCURACY
Integral Linearity Error ±3 ±2 ±3 LSB
1
Differential Linearity Error –2 +3 –1 +1.75 ±2 LSB
No Missing Codes 15 16 15 Bit
Transition Noise
2
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
4
±10 ±10 ±15 mV
Bipolar Zero Error Drift ±2 ±2 ±2 ppm/°C
Power Supply Sensitivity
V
ANA
= V
DIG
= V
D
= 5 V ± 5% ±8 ±8 ±8 LSB
AC ACCURACY
Spurious Free Dynamic Range
5
90 96 90 dB
6
Total Harmonic Distortion
5
–90 –96 –90 dB
Signal to (Noise + Distortion)
5
83 85 83 dB
–60 dB Input 27 28 27 dB
Signal to Noise
5
83 85 83 dB
Full-Power Bandwidth
7
1 1 1 MHz
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
8
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
DIGITAL INPUTS
Logic Levels
V
IL
–0.3 +0.8 –0.3 +0.8 –0.3 +0.8 V
V
IH
+2.0 V
DIG
+ 0.3 +2.0 V
DIG
+ 0.3 +2.0 V
DIG
+ 0.3 V
I
IL
±10 ±10 ±10 µA
I
IH
±10 ±10 ±10 µA
NOTES
1
LSB means least significant bit. With a ±10 V input, one LSB is 305 µV.
2
Typical rms noise at worst case transitions and temperatures.
3
Measured with fixed resistors as shown in Figure 5 (AD976) and Figure 6 (AD976A). Adjustable to zero as shown in Figure 7.
4
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. The full-scale error is the worst case of either the –full-scale or +full-scale code transition voltage errors.
5
f
IN
= 20 kHz (AD976) and f
IN
= 45 kHz (AD976A), 0.5 dB down, unless otherwise noted.
6
All specifications in dB are referred to a full scale ±10 V input.
7
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.
8
Recovers to specified performance after a 2 × F
S
input overvoltage.
Specifications subject to change without notice.
(–40ⴗC to +85ⴗC, F
S
= 200 kHz, Ref = Internal Reference, V
DIG
= V
ANA
= +5 V unless
otherwise noted)
–3–
REV. C
AD976/AD976A
AD976–SPECIFICATIONS
AD976A AD976B AD976C
Parameter Min Typ Max Min Typ Max Min Typ Max Units
RESOLUTION 16 16 16 Bits
ANALOG INPUT
Voltage Range ±10 ±10 ±10 V
Impedance 23 23 23 kΩ
Capacitance 22 22 22 pF
THROUGHPUT SPEED
Complete Cycle 10 10 10 µs
Throughput Rate 100 100 100 kHz
DC ACCURACY
Integral Linearity Error ±3 ±2 ±3 LSB
1
Differential Linearity Error –2 +3 –1 +1.75 ±2 LSB
No Missing Codes 15 16 15 Bit
Transition Noise
2
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
4
±10 ±10 ±15 mV
Bipolar Zero Error Drift ±2 ±2 ±2 ppm/°C
Power Supply Sensitivity
V
ANA
= V
DIG
= V
D
= 5 V ± 5% ±8 ±8 ±8 LSB
AC ACCURACY
Spurious Free Dynamic Range
5
90 96 90 dB
6
Total Harmonic Distortion
5
–90 –96 –90 dB
Signal to (Noise + Distortion)
5
83 85 83 dB
–60 dB Input 27 28 27 dB
Signal to Noise
5
83 85 83 dB
Full-Power Bandwidth
7
700 700 700 kHz
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
8
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
DIGITAL INPUTS
Logic Levels
V
IL
–0.3 +0.8 –0.3 +0.8 –0.3 +0.8 V
V
IH
+2.0 V
DIG
+ 0.3 +2.0 V
DIG
+ 0.3 +2.0 V
DIG
+ 0.3 V
I
IL
±10 ±10 ±10 µA
I
IH
±10 ±10 ±10 µA
NOTES
1
LSB means least significant bit. With a ±10 V input, one LSB is 305 µV.
2
Typical rms noise at worst case transitions and temperatures.
3
Measured with fixed resistors as shown in Figure 5 (AD976) and Figure 6 (AD976A). Adjustable to zero as shown in Figure 7.
4
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. The full-scale error is the worst case of either the –full-scale or +full-scale code transition voltage errors.
5
f
IN
= 20 kHz (AD976) and f
IN
= 45 kHz (AD976A), 0.5 dB down, unless otherwise noted.
6
All specifications in dB are referred to a full scale ±10 V input.
7
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.
8
Recovers to specified performance after a 2 × F
S
input overvoltage.
Specifications subject to change without notice.
(–40ⴗC to +85ⴗC, F
S
= 100 kHz, Ref = Internal Reference,
V
DIG
= V
ANA
= +5 V unless otherwise noted)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

AD976ACRZ

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Description:
Analog to Digital Converters - ADC 16-Bit 200 kSPS Parallel I/O
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