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Analog Devices Semiconductor Electronic Components Datasheet

AD876 Datasheet

10-Bit 20 MSPS 160 mW CMOS A/D Converter

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a
FEATURES
CMOS 10-Bit 20 MSPS Sampling A/D Converter
Pin-Compatible 8-Bit Option
Power Dissipation: 160 mW
+5 V Single Supply Operation
Differential Nonlinearity: 0.5 LSB
Guaranteed No Missing Codes
Power Down (Standby) Mode
Three-State Outputs
Digital I/Os Compatible with +5 V or +3.3 V Logic
Adjustable Reference Input
Small Size: 28-Lead SOIC, 28-Lead SSOP, or 48-Lead
Thin Quad Flatpack (TQFP)
10-Bit 20 MSPS 160 mW
CMOS A/D Converter
AD876
FUNCTIONAL BLOCK DIAGRAM
CLK
AVDD DVDD DRVDD
SHA
AIN
SHA
GAIN SHA
GAIN SHA
GAIN
A/D
REFTF
REFTS
REFBS
REFBF
A/D D/A
AD876
A/D D/A
A/D D/A
CORRECTION LOGIC
OUTPUT BUFFERS
CML
AVSS DVSS DRVSS
STBY
THREE-
STATE
(MSB)
D9
D0
(LSB)
PRODUCT DESCRIPTION
The AD876 is a CMOS, 160 mW, 10-bit, 20 MSPS analog-to-
digital converter (ADC). The AD876 has an on-chip input
sample-and-hold amplifier. By implementing a multistage pipe-
lined architecture with output error correction logic, the AD876
offers accurate performance and guarantees no missing codes
over the full operating temperature range. Force and sense con-
nections to the reference inputs minimize external voltage drops.
The AD876 can be placed into a standby mode of operation
reducing the power below 50 mW. The AD876’s digital I/O
interfaces to either +5 V or +3.3 V logic. Digital output pins
can be placed in a high impedance state; the format of the out-
put is straight binary coding.
The AD876’s speed, resolution and single-supply operation
ideally suit a variety of applications in video, multimedia, imag-
ing, high speed data acquisition and communications. The
AD876’s low power and single-supply operation satisfy require-
ments for high speed portable applications. Its speed and reso-
lution ideally suit charge coupled device (CCD) input systems
such as color scanners, digital copiers, electronic still cameras
and camcorders.
The AD876 comes in a space saving 28-lead SOIC and 48-lead
thin quad flatpack (TQFP) and is specified over the commercial
(0°C to +70°C) temperature range.
PRODUCT HIGHLIGHTS
Low Power
The AD876 at 160 mW consumes a fraction of the power of
presently available 8- or 10-bit, video speed converters. Power-
down mode and single-supply operation further enhance its
desirability in low power, battery operated applications such
as electronic still cameras, camcorders and communication
systems.
Very Small Package
The AD876 comes in a 28-lead SOIC, 28-lead SSOP, and 48-
lead surface mount, thin quad flat package. The TQFP package
is ideal for very tight, low headroom designs.
Digital I/O Functionality
The AD876 offers three-state output control.
Pin Compatible Upgrade Path
The AD876 offers the option of laying out designs for eight
bits and migrating to 10-bit resolution if prototype results
warrant.
REV. B
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., 1998


Analog Devices Semiconductor Electronic Components Datasheet

AD876 Datasheet

10-Bit 20 MSPS 160 mW CMOS A/D Converter

No Preview Available !

AD876–SPECIFICATIONS (TMIN to TMAX with AVDD = +5.0 V, DVDD = +5.0 V, DRVDD = +3.3 V, VREFB = +4.0 V, VREFB =
+2.0 V, fCLOCK = 20 MSPS, unless otherwise noted)
Parameter
RESOLUTION
DC ACCURACY
Integral Nonlinearity (INL)
Differential Nonlinearity (DNL)
No Missing Codes
Offset Error
Gain Error
ANALOG INPUT
Input Range
AD876JR-8
Min Typ Max
8
AD876
Min Typ
10
Max
± 0.3 ± 1.0
± 0.1 ± 0.75
GUARANTEED
0.1
0.1
± 1.0
± 0.5 ± 1
GUARANTEED
0.4
0.2
22
Input Capacitance
5.0
REFERENCE INPUT
Reference Top Voltage
Reference Bottom Voltage
Reference Input Resistance
Reference Input Current
Reference Top Offset
Reference Bottom Offset
3.5 4.0 4.5 3.5
1.6 2.0 2.5 1.6
250
8.0
35
35
DYNAMIC PERFORMANCE
Effective Number of Bits
fIN = 1 MHz
fIN = 3.58 MHz
fIN = 10 MHz
Signal-to-Noise and Distortion (S/N+D) Ratio
fIN = 1 MHz
fIN = 3.58 MHz
fIN = 10 MHz
Total Harmonic Distortion (THD)
fIN =1 MHz
fIN = 3.58 MHz
fIN =10 MHz
Spurious Free Dynamic Range2
Full Power Bandwidth
Differential Phase
Differential Gain
7.4
46
7.8
7.8
7.5
49
49
47
–62
–62 –56
–60
–65
150
0.5
1
8.2
51
POWER SUPPLIES
Operating Voltage
AVDD1
DVDD1
DRVDD
Operating Current
IAVDD
IDVDD
IDRVDD
+4.5
+4.5
+3.0
20
12
0.1
+5.25
+5.25
+5.25
25
16
1
+4.5
+4.5
+3.0
POWER CONSUMPTION
160 190
TEMPERATURE RANGE
Specified
0 +70 0
NOTES
1AVDD and DVDD must be within 0.5 V of each other to maintain specified performance levels.
23.58 MHz Input Frequency.
Specifications subject to change without notice. See Definition of Specifications for additional information.
5.0
4.0
2.0
250
8.0
35
35
9.0
9.0
8.2
56
56
51
–62
–62
–60
–65
150
0.5
1
20
12
0.1
160
4.5
2.5
–56
+5.25
+5.25
+5.25
25
16
1
190
+70
Units
Bits
LSB
LSB
% FSR
% FSR
V p-p
pF
V
V
mA
mV
mV
Bits
Bits
Bits
dB
dB
dB
dB
dB
dB
dB
MHz
Degree
%
Volts
Volts
Volts
mA
mA
mA
mW
°C
–2– REV. B


Part Number AD876
Description 10-Bit 20 MSPS 160 mW CMOS A/D Converter
Maker Analog Devices
Total Page 16 Pages
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