AD7884
器件描述：LC2MOS 16-Bit, High Speed Sampling ADCs
器件厂商：AD [Analog Devices]
文件大小：319.2KB，共16页
Sponsor by e络盟器件资料摘要：
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
LC
2
MOS
16-Bit, High Speed Sampling ADCs
AD7884/AD7885
© Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
FUNCTIONAL BLOCK DIAGRAMS
– 5V F
– 5V S
– 3V F – 3V S
16-BIT
ACCURATE
DAC
AD7884
TIMER CONTROL
DGND
CS
RD
BUSY
DB15
V S
REF+REF+
V F
V
REF–
AGNDS AGNDF AVDD
V
SS
GND
DB0
V INV
CONVST
IN
VDDAV
SS
R7
2kW
R8
2kW
9
9
9
16 16
VREF–
5kW
3kW
3kW
4kW
4kW
R1
R2
R3
R4
C1
SW1
R5
SW2
SW3
2kW
R6
A1
A2
9-BIT
ADC
LATCH
+
ALU
O
U
T
P
U
T
D
R
I
V
E
R
S
IN
IN IN
– 5V F
– 5V S
16-BIT
ACCURATE
DAC
AD7885
TIMER CONTROL
DGND
CS
RD
BUSY
DB7
V S
REF+
V F
REF+
V
REF–
AGNDS AGNDF AV
DD
VSS
GND
DB0
V
INV CONVST
IN
VDDAVSS
R7
2kW
R8
2kW
9
9
9
16 8
VREF–
5kW
3kW
2kW
4kW
4kW
R1
R2
3kWR3
R4
C1
SW1
R5
SW2
SW3
R6
A1
A2
9-BIT
ADC
LATCH
+
ALU
O
U
T
P
U
T
D
R
I
V
E
R
S
IN
IN– 3V
HBEN
FEATURES
Monolithic Construction
Fast Conversion: 5.3 ms
High Throughput: 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 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 microproces-
sor 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 2s complement
code.
The AD7884/AD7885 has its own internal oscillator which con-
trols conversion. It runs from ±5 V supplies and needs a V
REF+
of +3 V.
The AD7884 is available in a 40-pin plastic DIP package and in
a 44-pin PLCC package.
The AD7885 is available in a 28-pin plastic DIP package and
the AD7885A is available in a 44-pin PLCC package.
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
LC
2
MOS
16-Bit, High Speed Sampling ADCs
AD7884/AD7885
© Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
FUNCTIONAL BLOCK DIAGRAMS
– 5V F
– 5V S
– 3V F – 3V S
16-BIT
ACCURATE
DAC
AD7884
TIMER CONTROL
DGND
CS
RD
BUSY
DB15
V S
REF+REF+
V F
V
REF–
AGNDS AGNDF AVDD
V
SS
GND
DB0
V INV
CONVST
IN
VDDAV
SS
R7
2kW
R8
2kW
9
9
9
16 16
VREF–
5kW
3kW
3kW
4kW
4kW
R1
R2
R3
R4
C1
SW1
R5
SW2
SW3
2kW
R6
A1
A2
9-BIT
ADC
LATCH
+
ALU
O
U
T
P
U
T
D
R
I
V
E
R
S
IN
IN IN
– 5V F
– 5V S
16-BIT
ACCURATE
DAC
AD7885
TIMER CONTROL
DGND
CS
RD
BUSY
DB7
V S
REF+
V F
REF+
V
REF–
AGNDS AGNDF AV
DD
VSS
GND
DB0
V
INV CONVST
IN
VDDAVSS
R7
2kW
R8
2kW
9
9
9
16 8
VREF–
5kW
3kW
2kW
4kW
4kW
R1
R2
3kWR3
R4
C1
SW1
R5
SW2
SW3
R6
A1
A2
9-BIT
ADC
LATCH
+
ALU
O
U
T
P
U
T
D
R
I
V
E
R
S
IN
IN– 3V
HBEN
FEATURES
Monolithic Construction
Fast Conversion: 5.3 ms
High Throughput: 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 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 microproces-
sor 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 2s complement
code.
The AD7884/AD7885 has its own internal oscillator which con-
trols conversion. It runs from ±5 V supplies and needs a V
REF+
of +3 V.
The AD7884 is available in a 40-pin plastic DIP package and in
a 44-pin PLCC package.
The AD7885 is available in a 28-pin plastic DIP package and
the AD7885A is available in a 44-pin PLCC package.