AD7885ABP-REEL Analog Devices Inc, AD7885ABP-REEL Datasheet

IC ADC 16BIT SAMPLING HS 44-PLCC

AD7885ABP-REEL

Manufacturer Part Number
AD7885ABP-REEL
Description
IC ADC 16BIT SAMPLING HS 44-PLCC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD7885ABP-REEL

Rohs Status
RoHS non-compliant
Number Of Bits
16
Sampling Rate (per Second)
166k
Data Interface
Parallel
Number Of Converters
2
Power Dissipation (max)
325mW
Voltage Supply Source
Dual ±
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
44-PLCC
a
GENERAL DESCRIPTION
The AD7884/AD7885 is a 16-bit monolithic analog-to-digital
converter with internal sample-and-hold and a conversion time
of 5.3 µs. The maximum throughput rate is 166 kSPS. It uses a
two-pass flash architecture to achieve this speed. Two input
ranges are available: ± 5 V and ± 3 V. Conversion is initiated by
the CONVST signal. The result can be read into a microprocessor
using the CS and RD inputs on the device. The AD7884 has a
16-bit parallel reading structure while the AD7885 has a byte reading
structure. The conversion result is in twos complement code.
The AD7884/AD7885 has its own internal oscillator that controls
conversion. It runs from ±5 V supplies and needs a V
The AD7884 is available in a 40-lead CERDIP package and a
44-lead PLCC package.
The AD7885 is available in a 28-lead CERDIP package and the
AD7885A is available in a 44-lead PLCC package.
REV. E
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
FEATURES
Monolithic Construction
Fast Conversion: 5.3 s
High Throughput Rate: 166 kSPS
Low Power: 250 mW
APPLICATIONS
Automatic Test Equipment
Medical Instrumentation
Industrial Control
Data Acquisition Systems
Robotics
REF+
of 3 V.
16-Bit, High Speed Sampling ADCs
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
5V
5V
5V
5V
IN
IN
IN
IN
S
F
S
F
2k
2k
R6
R6
V
V
5k
5k
REF+
REF+
3V
R1
R1
3k
3k
FUNCTIONAL BLOCK DIAGRAMS
R2
R2
IN
F V
F V
F
4k
3V
4k
R4
R4
IN
ACCURATE
ACCURATE
REF+
REF+
A2
A2
3V
SW1
SW1
16-BIT
16-BIT
IN
2k
DAC
2k
DAC
© 2003 Analog Devices, Inc. All rights reserved.
S V
S V
S
R5
4k
R7
R5
4k
R7
V
V
3k
3k
REF–
REF–
R3
R3
INV
INV
SW2
SW3
SW2
SW3
2k
A1
2k
A1
R8
R8
C1
C1
AD7884/AD7885
V
V
9
9
REF–
REF–
AGNDS AGNDF AV
AGNDS AGNDF AV
TIMER
TIMER
9-BIT
9-BIT
ADC
ADC
GND
GND
CONVST
CONVST
CONTROL
CONTROL
9
9
9
9
LATCH
LATCH
ALU
ALU
BUSY
BUSY
DD
DD
+
+
AD7884
AD7885
AV
AV
www.analog.com
16
16
SS
SS
LC
DGND
DGND
V
V
O
U
U
O
U
P
U
T
P
T
T
T
DD
DD
D
R
V
E
R
S
D
R
V
E
R
S
I
I
2
V
V
16
MOS
SS
SS
8
CS
RD
DB7
CS
RD
HBEN
DB0
DB0
DB15

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AD7885ABP-REEL Summary of contents

Page 1

FEATURES Monolithic Construction Fast Conversion: 5.3 s High Throughput Rate: 166 kSPS Low Power: 250 mW APPLICATIONS Automatic Test Equipment Medical Instrumentation Industrial Control Data Acquisition Systems Robotics GENERAL DESCRIPTION The AD7884/AD7885 is a 16-bit monolithic analog-to-digital converter with ...

Page 2

... Temperature ranges are as follows Versions: –40°C to +85°C. = ± The AD7885AAP has the same specifications as the AD7884AP. The AD7885ABP has the same specifications as the AD7884BP. 4 Sample tested to ensure compliance. Specifications subject to change without notice. = 166 kHz. All specifications SAMPLE MIN ...

Page 3

TIMING CHARACTERISTICS Limit Parameter (All Versions 100 ...

Page 4

AD7884/AD7885 t CONVST CONVERT BUSY HI-Z DATA Figure 2. AD7884 Timing Diagram, Using CS and CONVST HBEN BUSY HI-Z DATA Figure 4. AD7885 Timing Diagram, Using CS ...

Page 5

... FSR) AD7884AP –40°C to +85°C –40°C to +85°C ± 0.0075 AD7884BP AD7885AAP –40°C to +85°C AD7885ABP –40°C to +85°C ± 0.0075 AD7884AQ –40°C to +85°C –40°C to +85°C ± 0.0075 AD7884BQ AD7885JQ –40°C to +85°C AD7885AQ – ...

Page 6

AD7884/AD7885 CERDIP INV REF+ REF– REF– REF+ DB15 DB14 DB13 AGNDS IN ...

Page 7

AD7884 AD7885 AD7885A INV INV INV REF– REF– REF– ± 3V ± ± 3V ± ± ± 5V ± 5V ± 5V ...

Page 8

AD7884/AD7885 TERMINOLOGY Integral Nonlinearity This is the maximum deviation from a straight line passing through the endpoints of the ADC transfer function. Differential Nonlinearity This is the difference between the measured and the ideal 1 LSB change between any two ...

Page 9

The required 3 V reference is derived from the AD780 and buffered by the high speed amplifier A3 (AD845, AD817, or equivalent unity gain inverter that provides the –3 V negative reference. The gain setting resistors are ...

Page 10

AD7884/AD7885 USING THE AD7884/AD7885 ANALOG INPUT RANGES The AD7884/AD7885 can be set up to have either a ± analog input range or a ± analog input range. Figures 10 and 11 show the necessary corrections for ...

Page 11

AD7884/AD7885 PERFORMANCE Linearity The linearity of the AD7884/AD7885 is determined by the on-chip 16-bit D/A converter. This is a segmented DAC that is laser trimmed for 16-bit DNL performance to ensure that there are no missing codes in the ADC ...

Page 12

AD7884/AD7885 Dynamic Performance With a combined conversion and acquisition time of 6 µs, the AD7884/AD7885 is ideal for wide bandwidth signal processing appli- cations. Signal-to-(noise + distortion), total harmonic distortion, peak harmonic or spurious noise, and intermodulation distortion are all ...

Page 13

CLK 82284 CLOCK GENERATOR Figure 19. AD7884 Interfacing to Basic iAPX 286 System AD7884 to 80286 Interface The 80286 is an advanced high performance processor with special capabilities aimed at multiuser and multitasking systems. Figure 19 shows an interface configuration ...

Page 14

AD7884/AD7885 AD7884 to ADSP-2101 Interface Figure 21 shows an interface between the AD7884 and the ADSP-2101. Conversion is initiated using a timer that allows very accurate control of the sampling instant. The AD7884 BUSY line provides an interrupt to the ...

Page 15

Ceramic DIP-Glass Hermetic Seal [CERDIP] 0.005 (0.13) MIN PIN 1 0.225(5.72) MAX 0.200 (5.08) 0.125 (3.18) 0.026 (0.66) 0.014 (0.36) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT ...

Page 16

AD7884/AD7885 0.048 (1.22) 0.042 (1.07) 6 0.048 (1.22) 7 PIN 1 IDENTIFIER 0.042 (1.07) TOP VIEW (PINS DOWN 0.656 (16.66) 0.650 (16.51) 0.695 (17.65) 0.685 (17.40) Revision History Location 2/03—Data Sheet changed from REV REV. E. ...

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